To see the other types of publications on this topic, follow the link: Drilling and well intervention.
Dissertations / Theses on the topic 'Drilling and well intervention'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Drilling and well intervention.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Tangen, Espen Håbet. "Slender well drilling and completion." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19624.
Full textAbstract:
Slender well drilling is a method that drills smaller holes and is more economical than conventional drilling due to the use of smaller equipment and rigs. Using the different tools for drilling slender wells, such as expandable reamers and expandable liners means that very deep wells can be drilled. If unexpected problems such as lost circulation or over pressured zones are faced, an expandable liner can be set. This type of solution imply very little or non- loss in diameter of the section. Reducing the amount of drill cuttings, steel, mud and cement means that less storage space is needed on the rig. Less storage needs means that a smaller and lower cost rig can be used. Using smaller equipment will also reduce the risk of the operations because the equipment is easier to handle during drilling and lifting operations. Avoiding the largest hole sizes and drilling more holes in the optimum range for ROP will reduce drilling time. There can also be some disadvantages with drilling slender wells. The equipment will be weaker if small holes are drilled, this is due to the small size of the equipment. In addition to this, hole cleaning can be a problem if mostly liners are used in the well and the well thereby have an upper sections with diameter that is significantly larger than the lower sections, since this will cause a large difference in the annular velocity of mud. The main objective with the thesis is to investigate the potential of using slender wells for exploration and production, as well as giving an overview of slender wells and how they are drilled. The work includes well construction, casing design and hydraulic calculations. The slender well designs are then to be compared with the conventional well design by looking at material savings. Pressure data from a high pressure and high temperature (HPHT) field in the North Sea was used. One of the objectives was to design a slender exploration well for 15 000 psi pressure rating. In addition to this a slender exploration well and a slender production well were designed using a water depth of 360 m. Based in the investigation slender well designs are feasible. The slender exploration wells are drilled in 5 sections, using a riser with an ID of 8 5/8” and an 11” wellhead (WH) and BOP. A 20” conductor casing is set, followed by an 11 3/4” surface casing with an 8 5/8” PIL. Then a 7” liner is set, before the well is drilled through the reservoir using a 5 7/8” drill bit. In the slender production well, an extra casing point is added to the well compared to the conventional well design, this allows more complicated wells to be drilled, or to cope with unexpected drilling problems. For drilling the slender exploration well, a riser with an ID of 12 1/2" is used together with an 11” WH and BOP. The surface casing has a diameter of 20”, followed by a 14” surface casing with a 10 3/4” PIL. An 8 5/8” liner is set below the 10 3/4" PIL. To maintain pressure integrity we install an 8 5/8 x 6 5/8” casing in the next section to isolate the liners, before the well is drilled to target depth (TD) where a 4 1/2" liner is set. The volume of drill cuttings from drilling the slender exploration well was reduced by 61,1 % compared to the conventional well. For the slender production well, the reduction was 53,5 %. The volume of steel for casings and liners in the well was reduced by 59,1 % for the exploration well and 20,1 % for the production compared to conventional well design. The mud volume needed in the well was reduced by 53,2 % for the slender exploration well compared to the conventional well, for the slender exploration well, the reduction in mud volume was 45,2 %. Further focus should be on well completion equipment for 15K pressure rating. This include expandable liner hanger, wellhead, BOP etc. A comparison of equipment for 10K versus 15K would have been of interest. Another important aspect is the time and cost saving from drilling slender wells.
2
Artiola, Janick. "Well Drilling and Pump Replacement." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2013. http://hdl.handle.net/10150/298297.
Full textAbstract:
Video is available on the UofAZCALS YouTube channel.<br>Arizona private well owners are responsible for their well water quality. This video shows where to collect water samples and describes the sample collection process in detail for the analysis of contaminants to insure unbiased results.
3
Williams, A. Lynn. "Implementing intervention with fidelity: Drilling down." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etsu-works/2014.
Full text
4
Muelhoefer, Jay A. (Jay Allan). "Flexible shaft drilling for cased well exploration." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37543.
Full text
5
Wang, Hong. "Near wellbore stress analysis for wellbore strengthening." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1338926861&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Full text
6
Becker, Thomas Edward. "Correlations for drill-cuttings transport in directional-well drilling /." Access abstract and link to full text, 1987. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/8712608.
Full text
7
CHIEZA, CAROLINA PONTES. "DIAGNOSTICS OF OPERATIONAL PROBLEMS DURING OIL WELL DRILLING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19161@1.
Full textAbstract:
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>A perfuração de poços de petróleo é uma operação complexa e de elevado
risco e custo financeiro. Com o passar dos anos o número de poços horizontais e
de longo alcance perfurados aumentou consideravelmente devido à existência de
reservatórios mais profundos e de difícil acesso, além da necessidade de se obter
uma melhor eficiência na extração do petróleo. Juntamente com este aumento na
complexidade da perfuração surgiram problemas operacionais que, por muitas
vezes, não são identificados e acabam sendo responsáveis pela maior parte do
tempo não produtivo da operação elevando, assim, seus custos diários. Logo, o
estudo destes problemas é de extrema importância para se garantir condições
seguras de operação, além de contribuir para a otimização da mesma, mitigação
dos efeitos causados e uma maior rapidez e eficácia nas tomadas de decisões. O
presente trabalho apresenta uma metodologia de identificação de problemas
operacionais a fim de otimizar a perfuração de poços, através da utilização de
recursos computacionais, para gerar análises de previsão de torque, arraste e
hidráulica e, posterior, comparação com os dados de perfuração obtidos, em
tempo real, dos sensores de mudlogging e da ferramenta de PWD. A
caracterização dos problemas foi realizada com base nos dados reais de poços
horizontais, perfurados na Bacia de Campos, mediante a identificação de possíveis
desvios importantes, que não estavam previstos, nos parâmetros de perfuração.
Através da retro-análise dos dados de perfuração dos poços foi possível
diagnosticar alguns problemas operacionais ocorridos durante esta operação, tais
como: perda de circulação, prisão da coluna de perfuração, washout no tubo de
perfuração e dificuldade de avanço causada por uma limpeza deficiente, pelo
enceramento da broca e pela vibração na coluna de perfuração. Além disso, foram
destacados também alguns exemplos que mostraram variações na tendência do
torque em função de mudança na litologia do poço.<br>Drilling is a complex and a high risk process which involves high financial
cost. Over the years the number of horizontal wells and extended reach wells
increased, due to the existence of deeper reservoirs, which are more difficult to
access, in addition to the need of having an improvement in the oil production
efficiency. Along with this increased complexity of drilling, unidentified
operational problems end up being responsible for most of the non-productive
time and daily cost increase. Thus, analyzing such problems it is very important to
ensure safe operating conditions, optimize drilling operation, control
causes/effects and have a faster and efficient decision-making capability.
This paper presents a methodology to identify operational problems in order to
optimize drilling operation using computer resources to predict torque, drag and
hydraulic effects and later on to compare with the drilling data obtained in real
time from mudlogging sensors and PWD (Pressure While Drilling).
Cases were based on real time data from horizontal wells drilled in Campos Basis,
Rio de Janeiro, and the problems were identified with unforeseen changes in
drilling parameters trend. After studying the available well data, it was possible to
diagnose several operational problems occurred during drilling, such as: lost
circulation, stuck pipe, drill pipe washout and difficulty in drilling due to a poor
hole cleaning, bit balling and drill string stick-slip vibration. In addition, it was
also highlighted some examples that showed variations in the torque trend due to
lithology changes.
8
PICARD, NICOLAS. "DEVELOPMENT OF NOVEL HYDRAULICS FOR OIL WELL DRILLING." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1025637714.
Full text
9
Campos, Wellington. "Mechanistic modeling of cuttings transport in directional wells /." Access abstract and link to full text, 1995. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9527819.
Full text
10
Hernæs, Marthe Pernille Voltersvik. "Human related root causes behind oil well drilling accidents." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20384.
Full textAbstract:
Many accident investigation techniques and other methods used by the petroleum industry today list a set of underlying human related causes and subsequent improvement suggestions. Do these techniques address the root cause behind the problem so that the appropriate initiatives can be implemented? The focus of the present thesis was to determine the human related root cause of two major accidents in the North Sea. This in order to give recommendations to improve the safety levels in the organisation. In order to achieve the above-mentioned goals, the IPT Knowledge Model was adapted to the given accidents. The data input into the model was based on interpreted observations from former investigation reports. The analysis of the blowout on Snorre A and the well control incident on Gullfaks C resulted in 49 and 63 observations respectively. For both accidents, the Human Factor that was indicated to have the largest affect on the accidents was Training and Competency (29% for Snorre A and 19% for Gullfaks C). Lack of competence was indicated as the majority subclass. Collectively, management and supervision, or lack thereof, was also indicated as being a contributing factor to the accidents. These final results coincide with the findings in other investigation reports. However, these are more acute, indicating a specific area of improvement within the company. By increasing the competency levels within the company and ensuring that the leaders and management have the proper tools to follow-up their employees and their operations, the safety levels and culture will improve.
11
Kartoatmodjo, Rudjuk Sinung Trijana. "A model for finite conductivity horizontal wellbores /." Access abstract and link to full text, 1994. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9522755.
Full text
12
Ozkan, Erdal. "Performance of horizontal wells /." Access abstract and link to full text, 1988. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/8825498.
Full text
13
Essiwi, Mohamed Milad Ahmed. "Validation of CFD modeling for oil well drilling fluid flows." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430771.
Full text
14
Wan, Stephen. "The flow of drilling fluids in the well-bore annulus." Thesis, Robert Gordon University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267511.
Full text
15
FUENTES, CRISTINA DE LAS NIEVES ARANEDA. "PROBABILISTIC EVALUATION OF PETROLEUM PROSPECTS PRIOR TO WILDCAT WELL DRILLING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5150@1.
Full textAbstract:
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Estudos econômicos de áreas com indícios de hidrocarbonetos
estão imersos em incertezas de diferentes naturezas
(geológicas, de engenharia e econômicas). No início do
estudo, aspectos da geologia, dos fluidos, das rochas e do
reservatório só são conhecidos por métodos indiretos que
fornecem informações imprecisas. A redução dessas
incertezas é limitada pelos elevados custos de perfuração
de poços que permitam testes diretos. Conseqüentemente,
decisões de investimentos de exploração têm que ser
tomadas sob risco motivando, assim, o desenvolvimento de
métodos para a avaliação econômica probabilística de
propriedades. O foco desta dissertação é a avaliação
econômica probabilística de recursos petrolíferos, antes da
perfuração do poço pioneiro. O cálculo do valor econômico
de uma propriedade depende das estimativas dos perfis
temporais de receitas e custos associados ao seu
desenvolvimento e produção (D e P). A obtenção de tais
elementos requer um projeto de D e P para a propriedade que,
em função dos dados disponíveis, é menos detalhado do que
um projeto de simulação multicelular. Nesta dissertação,
uma metodologia de avaliação baseada em simulação de Monte
Carlo é apresentada juntamente com uma implementação-
protótipo. A realização das numerosas replicações,
necessárias para se obter uma avaliação probabilística, se
torna viável graças a um programa capaz de gerar o projeto
de D e P automaticamente. Esse programa foi desenvolvido pela
Petrobras com base em regras fornecidas por um
especialista. Além da justificativa para a abordagem
adotada, da descrição e implementação do método, são feitas
considerações sobre distribuições de probabilidade para
codificar incertezas e sobre os resultados dos testes
iniciais do sistema protótipo.<br>Economics studies of areas with indications of hydrocarbons
are submerged in uncertainties of assorted natures
(geological, of engineering and economical). At the start
of the study, aspects concerning the geology, the fluids,
the rocks and the reservoir are only known through indirect
methods that yield imprecise information. The reduction of
these uncertainties is limited by high costs of drilling
wells that allow direct tests. Consequently, decisions on
exploration investments have to be made under risk. This
motivates the development of methods for probabilistic
economic evaluation of properties. This dissertation
addresses the probabilistic economic evaluation of
petroleum resources, prior wildcat well drilling. Assessing
the economic value of a property depends on estimates of
incomes and costs time profiles associated to its
development and production (D and P). Obtaining such elements
requires a D and P project for the property that, due to the
limited data available, is less detailed than a multi-
cellular simulation project. In this thesis, a probabilistic
evaluation methodology based on Monte Carlo simulation is
presented along with a prototype implementation. Performing
the numerous replications necessary to obtain a
probabilistic evaluation becomes feasible thanks to a
procedure capable of automatically generating the D and P
project. That procedure was developed by Petrobras based on
heuristic rules supplied by an expert. In addition to a
justification for the proposed approach, the description
of the method and its implementation, comments are made on
probability density functions used for encoding
uncertainties, and on the results of the initial tests with
the prototype system.
16
AL-Rashidi, Abdulrahman F. "Designing neural networks for the prediction of the drilling parameters for Kuwait oil and gas fields." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1209.
Full textAbstract:
Thesis (M.S.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains x, 76 p. : ill. (some col.), map (some col.). Includes abstract. Includes bibliographical references (p. 54-55).
17
Huang, Xiaoguang. "Limit state design of oil and gas well casings." Thesis, University of Wolverhampton, 2002. http://hdl.handle.net/2436/99757.
Full text
18
Ali, Md Wazed. "A parametric study of cutting transport in vertical and horizontal well using computational fluid dynamics (CFD)." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2281.
Full textAbstract:
Thesis (M.S.)--West Virginia University, 2002.<br>Title from document title page. Document formatted into pages; contains x, 108 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 42-46).
19
Farrelly, M. "Performance evaluation and selection of rotary drilling bits." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234404.
Full text
20
Chidamoio, João Fernando. "Experimental and numerical modelling of gaslift cavitation and instabilities in oil producing wells." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=239215.
Full text
21
Leamon, Gregory Robert Petroleum Engineering Faculty of Engineering UNSW. "Petroleum well costs." Awarded by:University of New South Wales. School of Petroleum Engineering, 2006. http://handle.unsw.edu.au/1959.4/30599.
Full textAbstract:
This is the first academic study of well costs and drilling times for Australia???s petroleum producing basins, both onshore and offshore. I analyse a substantial database of well times and costs sourced from government databases, industry and over 400 recent well completion reports. Three well phases are studied - Pre-Spud, Drilling and Completion. Relationships between well cost factors are considered, including phase time, phase cost, daily cost, rig day rate, well depth, basin, rig type, water depth, well direction, well objective (e.g. exploration), and type of completion (P&A or producer). Times and costs are analysed using scatter plots, frequency distributions, correlation and regression analyses. Drilling times are analysed for the period 1980 to 2004. Well time and variability in well time tend to increase exponentially with well depth. Technical Limits are defined for both onshore and offshore drilling times to indicate best performance. Well costs are analysed for the period 1996 to 2004. Well costs were relatively stable for this period. Long term increases in daily costs were offset to some extent by reductions in drilling times. Onshore regions studied include the Cooper/Eromanga, Surat/Bowen, Otway and Perth Basins. Offshore regions studied include the Carnarvon Basin shallow and deepwater, the Timor Sea and Victorian Basins. Correlations between regional well cost and well depth are usually high. Well costs are estimated based on well location, well depth, daily costs and type of completion. In 2003, the cost of exploration wells in Australia ranged from A$100,000 for shallow coal seam gas wells in the Surat/Bowen Basins to over A$50 million for the deepwater well Gnarlyknots-1 in the Great Australian Bight. Future well costs are expected to be substantially higher for some regions. This study proposes methods to index historical daily costs to future rig day rates as a means for estimating future well costs. Regional well cost models are particularly useful for the economic evaluation of CO2 storage sites which will require substantial numbers of petroleum-type wells.
22
DUARTE, RICARDO GOMES. "EVALUATION OF THE SHALE-DRILLING FLUID INTERACTION FOR STUDIES OF WELL STABILITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5163@1.
Full textAbstract:
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>GRUPO DE TECNOLOGIA E ENGENHARIA DE PETRÓLEO - PUC-RIO<br>A estabilidade de poços em trechos de folhelho é muito
influenciada pelo tipo de fluido de perfuração utilizado.
As pressões de poro geradas durante a perfuração e a
difusão destas pressões são as principais responsáveis pela
estabilidade a curto prazo do poço, assim como pela
eventual instabilidade a médio prazo. O efeito membrana e o
conseqüente desenvolvimento de pressões osmóticas ao redor
do poço desempenham um papel fundamental no balanço das
forças que instabilizam a rocha.
Esta dissertação se foca no estudo experimental, utilizando
uma célula de difusão, do comportamento de folhelhos
expostos, após a perfuração, a fluidos de perfuração do
tipo base água e salinos, pressurizados com vistas à
estabilidade das paredes do poço. São avaliados os aspectos
físico-químicos da interação folhelho-fluido, em especial,
no tocante ao desenvolvimento de pressão osmótica e efeito
membrana.
Testes de interação rocha-fluido utilizando folhelhos
provenientes da Bacia de Campos e do Mar do Norte
demonstraram a eficiência do equipamento em realizar
ensaios com fluidos viscosos base água. O estudo das
propriedades reológicas deste fluido foi realizado
utilizando equipamentos especializados. Verificou-se nos
ensaios que o comportamento de transmissão de pressão deste
fluido é similar ao da água e que, aparentemente, o
coeficiente de reflexão é mais influenciado pela
porosimetria do folhelho do que pela sua mineralogia.<br>Well stability in shale sectors is very much influenced by
the type of drilling fluid used. The pore pressures
generated during drilling and the diffusion of these
pressures are chiefly responsible for the short time
stability of the well as well as the eventual instability
some time after drilling. The membrane effect and the
subsequent osmotic pressure developed around the well play
a fundamental role in the force balance that destabilizes
the rock.
This study focuses on assessing, inside the diffusion cell,
the exposed shale behavior, after drilling, using water
base mud brines, pressurized considering the wall stability
of the well. The physical-chemical aspects of the shale-
fluid interation are evaluated, in particular, in relation
to osmotic pressure and membrane effects developments.
Rock-fluid interaction tests using shale samples collected
from Campos Basin and North Sea, showed the efficiency of
the equipment in carrying out experiments with viscous base
water fluids. The study of reological properties of this
fluid was made using specialized equipments. The
experiments verified that the fluid pressure transmission
behaviour is similar to water and, apparently, the
reflection coefficient in more influenced by porosimetry of
the shale than by your mineralogy.
23
Dudo, Anthony David. "An environmental controversy how newspapers framed coverage of the Bush administration's proposal to drill for oil and gas in the Arctic National Wildlife Refuge (Alaska) /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.65Mb., 129 p, 2005. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1428181.
Full text
24
Havens, David Loran Williams Harry. "Assessment of sediment runoff from natural gas well development sites." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3665.
Full text
25
Noynaert, Samuel F. "Ultrapdeep water blowouts: COMASim dynamic kill simulator validation and best practices recommendations." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1543.
Full textAbstract:
The petroleum industry is in a constant state of change. Few industries have advanced as far technologically as the petroleum industry has in its relatively brief existence. The produced products in the oil and gas industry are finite. As such, the easier to find and produce hydrocarbons are exploited first. This forces the industry to enter new areas and environments to continue supplying the world's hydrocarbons. Many of these new frontiers are in what is considered ultradeep waters, 5000 feet or more of water. While all areas of the oil and gas industry have advanced their ultradeep water technology, one area has had to remain at the forefront: drilling. Unfortunately, while drilling as a whole may be advancing to keep up with these environments, some segments lag behind. Blowout control is one of these areas developed as an afterthought. This lax attitude towards blowouts does not mean they are not a major concern. A blowout can mean injury or loss of life for rig personnel, as well as large economic losses, environmental damage and damage to the oil or gas reservoir itself. Obviously, up-to-date technology and techniques for the prevention and control of ultradeep water blowouts would be an invaluable part of any oil and gas company's exploration planning and technology suite. To further the development of blowout prevention and control, COMASim Cherokee Offshore, MMS, Texas A&M Simulator) was developed. COMASim simulates the planning and execution of a dynamic kill delivered to a blowout. Through a series of over 800 simulation runs, we were able to find several key trends in both the initial conditions as well as the kill requirements. The final phase of this study included a brief review of current industry deepwater well control best practices and how the COMASim results fit in with them. Overall, this study resulted in a better understanding of ultradeep water blowouts and what takes to control them dynamically. In addition to this understanding of blowouts, COMASim's strengths and weaknesses have now been exposed in order to further develop this simulator for industry use.
26
Shewring, Nigel Ivor Edward. "Interactions at the clay/polymer/water interface." Thesis, Sheffield Hallam University, 1998. http://shura.shu.ac.uk/20358/.
Full textAbstract:
The thesis investigates the behaviour of aqueous montmorillonite suspensions and also the interactions between montmorillonite as a free standing film and in highly dispersed aqueous suspension with water soluble polymers used as additives in water based drilling fluids. FTIR microscopy and FTIR ATR spectroscopy have been employed to study in-situ dehydration of fully dispersed aqueous montmorillonite suspensions. The IR spectrum of the dispersed bentonite shows significant differences from that of a dry bentonite powder, which have been attributed to the hydration of the exchangeable cation. Drying, or concentrated salt solution causes the differences to disappear and this is attributed to the exchangeable cation settling back to its ditrigonal cavity in the silicate sheet of the mineral under these conditions. The adsorption of various molecular weights of neutral polyacrylamide (PAM) onto montmorillonite has been studied using FTIR transmission, ATR spectroscopy and XRD. Shifts seen in the NH[2] stretching and bending bands have been interpreted as being due to H-bonding with the outer co-ordination sphere of exchangeable cations. KCl has shown to have some influence on this system. Another neutral polymer used extensively in water based drilling fluids is polyalkylglycol (PAG). The adsorption of two molecular weights of this polymer from aqueous solutions of various concentrations have been monitored both in the presence and absence of KCl. The physical form of the montmorillonite (either as a free standing film or as a dispersed suspension), the concentration of the polymer solution, the polymer molecular weight and the presence of KCl all have significant effects on the adsorption of polymer. The stabilisation of montmorillonite films by PAG and PAG/KCl solutions has been monitored by ATR spectroscopy, and the dehydration of these films by polymer has been monitored using FTIR spectroscopy and XRD. The interaction of PAG is thought to be via hydrogen bonding with the innermost co-ordination sphere of the exchangeable cations which thus presents a hydrophobic surface to solvent molecules, preventing the film from collapse. Since all water based drilling fluids are multi-component systems, techniques previously used have been employed to study the competitive adsorption of the polyalkylglycol and polyacrylamide components. Preferential adsorption of the PAG is seen in these systems either due to the mass transport effects (PAG is considerably smaller than PAM) or due to PAG removing all but the inner cation hydration sphere, and presenting a hydrophobic surface for the PAM, and therefore preventing its adsorption.
27
Alborzi, Mahmood. "Application of neural networks to real-time log interpretation in oil well drilling." Thesis, Brunel University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309502.
Full text
28
Grebstad, Leni. "The Influence of Automation on Human Error in Managed Pressure Drilling Well Control." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for industriell økonomi og teknologiledelse, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26833.
Full textAbstract:
This thesis aims to explain and discuss the concept of automation in Managed Pressure Drilling systems and how this may influence the risk of well control incidents by its effect on human performance, focusing on human errors. The scope also includes examining the change of mode of automation during a well control incident, and recommend for a future mode of automation from a human factor point of view. An MPD system developed by Halliburton AS was used as a case, while the critical well control incident, lost circulation, formed the scenario. Researchers and technical professionals also shared their point of view in possibilities and challenges with MPD.The petroleum industry in seeking improved technologies to drill wells with a narrow drilling window, such as depleted reservoirs. Automated MPD has addressed this challenge with dedicated pressure control equipment. A higher mode of automation may reduce some risks, such as kicks and losses. However, it may also introduce new types of safety issues that affect the risk of human error. The Norwegian Petroleum Safety Authority requires systems and equipment to be designed such that the possibility of human error is limited. NORSOK S-002 requires the execution of analysis to ensure that the potential for human error in work systems is minimized. Methods utilized in this thesis were the functional analysis, FAST, allocation of functions, task analysis, and a systematic human error reduction and prediction approach, SHERPA.Functions required to maintain bottomhole pressure within drilling window was identified with FAST. The analysis demonstrated a more complex primary well control than for conventional drilling. Allocation of functions to human and machine illustrated that the backpressure pump and the MPD choke are automatically controlled during drilling (Mode 3 Management by Delegation), while manually handled during lost circulation (Mode 1 Assisted Manual Control). Allocation of functions and the task analysis clarified a frequent change in task responsibilities between the driller and the MPD operator. SHERPA found that errors made by the driller or the MPD operator could lead to failure of filling the well adequately with mud during losses, which initiates a kick. If the blowout-preventer is not closed, it could result in the kick developing into a blowout. A clear instruction on when to close the BOP was not found, with limitations of time and information available to confirm this finding.A future mode of automation in MPD systems is recommended to be similar to today’s situation. The operation is then enhanced during drilling, while allowing the operator to intervene to varying degrees in case of abnormal operation. This could provide benefits such as improved situation awareness, workload, and overall human-machine performance. However, the increase in complexity, coupled with team-work previously not found in traditional drilling methods, may suggest that communication, interaction between different operators, and mistaken judgments are vulnerable aspects. These findings combined with changed task demands propose that automated MPD introduces new types of human errors that could influence risks prior to and during a well control incidents. Still, the MPD equipment offers a more precise adjustment of the bottomhole pressure proposing that some well control incidents are more simplified to handle. Incorporating the human element in major accident risk analyses has been suggested to be a promising path to improve safety and reliability in safety-critical system.
29
GAGGIOTTI, KARINA VIOLETA BARRIONUEVO. "CHARACTERIZATION OF SHALES BASED ON DRILLING CUTTING SAMPLES, PRESERVED CORES AND WELL LOGS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1257@1.
Full textAbstract:
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Durante a perfuração de poços em seqüências argilosas, tais
como os folhelhos, tem-se registrados sérios problemas
operacionais e de estabilidade de poço. Estes problemas
estão relacionados com as propriedades do fluido de
perfuração, as condições de contorno e principalmente, com
as propriedades da rocha perfurada.
No estudo do comportamento da rocha a determinação das
propriedades de resistência e deformabilidade tem caráter
prioritário. Porém para folhelhos, características tais
como mineralogia, conteúdo de minerais de argila, teor de
umidade e porosidade, têm igual relevância. Entre os
materiais disponíveis para a avaliação das características
do folhelho, têm-se as amostras de calha, testemunhos
preservados e perfis de poços.
O presente trabalho avalia as metodologias existentes no
estudo do sistema folhelho para a determinação das
características que são relevantes no processo de
instabilidade do poço. Nestas metodologias, incluem-se
aquelas aplicadas a estudo das amostras de calha e
testemunhos preservados, assim como os modelos de
interpretação dos perfis de poço. Ao final são apresentadas
recomendações a respeito das possíveis correlações dos
resultados obtidos nas duas metodologias.<br>While drilling shale, it is common to face serious
operational and wellbore stability problems.
These problems are related to drilling fluid properties, in-
situ stresses and mainly rock
properties.
To achieve a good understanding of rock behaviour, highest
priority must be given to strength
and strain determination. However, when dealing with
shales, we need also to take into
account properties as mineralogy, clay content, water
content and porosity. The available
materials to conduct a shale property study are drilling
cuttings, preserved cores and well
logs.
The scope of this work includes a review of the existent
methods for a complete shale stability
study. Finally, some recommendations regarding possible
correlation between the appraised
methods are presented.<br>Durante la perforación de pozos en secuencias arcillosas, tales como los folhelhos, se han registrado serios
problemas operacionales y de estabilidad del pozo. Estos problemas están relacionados con las propriedades del
fluido de perforación, las condiciones de contorno y principalmente, con las propriedades de la roca perforada. En
el estudio del comportamiento de la roca, la determinación de las propriedades de resistencia y deformabilidad
tiene caráter prioritario. No obstante, para folhelhos, características tales como mineralogía, contenido de
minerales de arcilla, teor de humedad y porosidad tienen igual relevancia. Entre los materiales disponibles para la
evaluación de las características del folhelhos, se tienen las muestras de canal, testimonios preservados y
perfiles de pozos. El presente trabajo evalúa las metodologías existentes en el estudio del sistema folhelhos para
la determinación de las características que son relevantes en el proceso de inestabilidad del pozo. En estas
metodologías, se incluyen aquellas aplicadas al estudio de las muestras de canal y testigos preservados, así
como los modelos de interpretación de los perfiles de pozo. Al final se presentan recomendaciones con respecto a
las posibles correlaciones de los resultados obtenidos en las dos metodologías.
30
Dangou, Mohamad Ali Abdulla. "Investigations of the filtration parameters of drilling fluids for optimising oil well productivity." Thesis, University of Aberdeen, 2007. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU239344.
Full textAbstract:
The main objective of this research was to gain further understanding of the behaviour of oil wellbore fluid filtrates, the various factors affecting filter cake quality, and how these can be controlled to reduce the invasion of the filtrate around the wellbore region. The investigations were intended to define filtration behaviour and filter cake parameters at different fluids with various particle size distributions and various wellbore conditions that are: different filtration pressures, different filtration times, and different shear rates acting on the cake surface during dynamic filtration conditions. The results indicated that all the above mentioned filtration parameters have a various degree of influence on the filter cake and filtration parameters. The forces acting on a particle suspended in the wellbore fluids during dynamic cake particle deposition were also analyzed and a dynamic filtration model was developed. This model can be used to determine the average critical shear rate of these particles and the frictional coefficient factors of the particles with the cake surface. The model has then been modified to predict equilibrium filtration flow rate at any shear stress (above the critical value) applied on the cake surface. Investigations on the transient stage of the dynamic filtration agreed with literature and showed that the size of particles deposited onto the cake decreased with increasing cake thickness, causing the particle size distribution of the dynamic filter cake to alter with cake thickness.
31
Acheampong, Theophilus. "Essays on North Sea oil and gas economics : offshore safety economics and third party access to infrastructure in the upstream oil and gas industry." Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=232397.
Full textAbstract:
This thesis explores two themes on upstream oil and gas economics centred on offshore safety economics and third party access to infrastructure in the United Kingdom Continental Shelf (UKCS). The first part involves work that explores the nexus between the offshore safety regime and safety outcomes. It contributes to the literature by explaining the post-Piper Alpha safety regime changes with regard to our understanding, framing of safety decision making and benchmarking of safety outcomes. The second part investigates third party access to infrastructure issues in the UKCS. It contributes to our understanding of how different third party access to infrastructure arrangements can be utilised to maximise economic recovery. Each chapter addresses fundamental issues of North Sea oil and gas operations through the application of microeconomic, operations research and econometric methods within a formal analytical framework. The results provide insights into decision-making complexities in the upstream oil and gas industry by guiding policy makers. Specifically, part one of this thesis looks at safety performance in the post-Piper Alpha era in the UKCS. It investigates ways through which a more comprehensive and theoretically informed framework can be used to understand the linkages that arise when dealing with safety regulations and their impacts on the offshore oil and gas industry. Our objective is to empirically ascertain the determinants of offshore hydrocarbon releases within the context of the post-Piper Alpha offshore safety regime regulations. This is done using an observed number of hydrocarbon releases linked to a population denominator data of the number of the installations present in the UKCS. Three research problems are examined: (1) the transmission mechanisms through which safety regulation influence firm and industry productivity; (2) the assessment methods utilised in measuring and benchmarking regulatory outcomes in terms of safety compliance; and (3) the extent to which safety policies contribute to enhancing safety levels in the oil and gas industry. We initially review the background and literature on offshore safety with a particular emphasis on the UKCS in Chapter 2. We also frame our research questions and underlying hypothesis here. In Chapter 3, we present our underlying empirical framework and model specifications followed by some descriptive analysis of the hydrocarbon releases data. The results of the various econometric model specifications are analysed in Chapter 4. The second part of the thesis explores how possible different ownership patterns (including access arrangements) might affect the economic viability of exploiting remaining resources in the UKCS. This section attempts to answer two critical questions namely how the impact of the separation of infrastructure and field ownership affect economic recovery and the impact of taxation on field and hub economics in a mature oil basin. We explore how possible different ownership structures and access arrangements might affect the economic viability of remaining UKCS reserves. We apply a mixed integer programming (MIP) model to field data from the Northern North Sea. Specifically, we examine how the unbundling of infrastructure and field ownership, as well as different cost sharing and tariff arrangements, affect the long-term economics of hubs and their user fields. Regarding the layout, Chapter 5 talks about access to infrastructure issues in the UKCS namely the regulatory framework for access and related legislation. It leads to the development of a conceptual framework and model based upon which extractions are made to capture the various potential market outcomes. In Chapter 6, the empirical model, which utilises the mixed integer programming approach, is discussed. The data sources and characterization, as well as the presentation of the results from the Baseline Model, are presented in Chapter 7. The analysis of the Tax Model and the Cost Sharing plus Tax Model including structure and simulated results with underlying assumptions are presented in Chapter 8. Finally, Chapter 9 leads to a thorough discussion of the results followed by conclusions and policy recommendations.
32
Holman, Travis Scott. "Analysis and optimization of coalbed methane gas well production." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/44957.
Full textAbstract:
Coalbed methane wells have been used for many years as a viable means of
extracting quantities of methane gas for use as a clean and efficient energy source.
However, there is a limited understanding of many of the factors involved during the
extraction process. As the more easily attainable reservoirs are depleted, it is imperative
to gain a greater comprehension of these factors in order to develop techniques to
efficiently collect economical quantities of methane gas in the future.
<p>For this investigation, an extensive database was compiled, consisting of a large set
of parameters pertaining to the development of coalbed methane gas wells. Using the
information contained in this database, a statistical analysis was performed in order to gain
a better understanding of the relationships between the many factors involved in extracting
quantities of methane gas from the ground. The results of this analysis showed that the
majority of the parameters shown to have the greatest impact on methane production were
heavily dependent upon the geology of the region. As a result, any attempt to exploit
them for optimization exercises would be extremely difficult. Of the parameters shown to
have the least dependence on naturally occurring phenomena, the amount of proppant
sand used to hold fractures open within the well system after stimulation was shown to
have the most impact
<p>During the well stimulation procedure, the proppant sand is carried into the
fractures in the strata by a foam fracturing fluid. The sand acts to support the fracture
system, increasing the permeability of formation, and allowing the methane gas to flow to
the wellbore. By treating the sand particles with certain reagents, it is possible to render
them hydrophobic, making it possible for them to stick to the bubbles within the foam and
be carried deeper into the formation. Results of an investigation of sands treated to
different degrees of hydrophobicity have shown that such treatments significantly increase
the amount of sand distributed over a greater distance.<br>Master of Science
33
Величкович, А. С., та Д. О. Паневник. "Дослідження напружено-деформованого стану корпусу гідравлічного пристрою для буріння свердловин". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40396.
Full textAbstract:
Висока ефективність використання ежекційних технологій зумовила
широкий спектр їх застосування у процесі буріння, освоєння та експлуатації
свердловин. Ускладнення умов видобування пластового флюїду потребує
створення нових методів розробки покладів вуглеводнів, а тому
удосконалення ежекційних технологій нафтогазовилучення є актуальним
завданням.
34
Valås, Inge Åsmund. "A Data-intensive Approach to Prediction of Unwanted Events during Oil and Gas Well Drilling." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9282.
Full text
35
Alusta, Gamal Abdulla Mohamed. "A decision making tool to assist in choosing between polymer flooding and infill well drilling." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2640.
Full textAbstract:
Oil companies propose polymer flooding techniques, but oftentimes find it difficult to convince asset teams to implement these. This is because it is much easier to estimate the return on investment from an infill well drilling programme, and the return is much quicker. On the other hand, there may be a delay of years before increased oil recovery is observed following implementation of polymer flooding process, and indeed, it may be difficult to ascertain just how much incremental oil has been recovered. The work developed in this thesis involved setting up a range of polymer flooding scenarios, performing analysis using both very detailed reservoir simulation calculations with a range of sensitivities, and also economic calculations, again testing a range of parameters, to ensure that a full range of possible outcomes is evaluated, and then making a comparison with infill drilling to maximise the value of mature assets. The method was first applied to a synthetic scenario with constant economic parameters, and was then applied and tested with varied operational and economic parameters. These sensitivity calculations have been performed by developing a computer program, coded in Java. Monte Carlo Simulation (MCS) is then performed to generate statistics from this method, and test economic uncertainties and the risks associated with implementation of polymer flooding. The method was then applied to a real field system where the choice of infill well drilling had previously been made by the operating company, to test the robustness of the analysis using polymer flooding against a conventional decision making process for which there is historical data. Finally, the approach was then used in an offshore field which has been undergoing waterflooding, but where the choice for further field development has yet to be made, with the operator considering polymer flooding as an alternative (or in addition) to infill well drilling. The thesis discusses the implications of using this newly developed methodology in identifying the risk of failure and in assisting in making an optimal choice based on technical and economic considerations in a fully integrated manner.
36
Ruiz, Manuel Sebastian Salazar. "A study on well design and integrity for deepwater exploratory drilling in Brazilian Equatorial Margin." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-25092018-100849/.
Full textAbstract:
Drilling operations in deepwater (DW) or ultra-deepwater areas, even more in exploratory frontiers, have been increasingly challenging due to the operational complexities and limited available data about the subsurface conditions. In this sense, enhancing safety and minimizing the likelihood of losing well integrity and damage to the environment is a currently essential objective relating to offshore drilling activities. Hence, deepwater well designs should advance to safely meet the challenges related to the progression of well and water depths. The safe construction of these wells requires the application of suitable well design considerations that include well integrity approaches to reduce the risk of an unintended release of formation fluids (oil, gas or water) to the environment during the deepwater drilling operations, in other words a \"Blowout\" occurrence. In this study it is proposed two deepwater well architectural designs, limited to drilling stage, that safely accomplish the well targets and facing several deepwater well complexities, e.g. narrow operating envelopes. Thus, well logging and geological data of two actual pioneer wells drilled in deep and ultradeep water zones in Ceará Basin are used as a basis to construct and assess the drilling operating envelopes, to define the casing shoe depths and well barrier envelope. Furthermore, it is introduced the application of at least two independent Barrier Integrated Sets (BISs) to ensure the well integrity during the 4th phase drilling of the proposed well architectures, as it has recently been required in Brazil by the National Petroleum Agency (ANP) through \"Well Integrity Management System\" (SGIP for its acronym in Portuguese).<br>As operações de perfuração em áreas de águas profundas ou ultra profundas, ainda mais nas fronteiras exploratórias, têm sido cada vez mais desafiadoras devido às complexidades operacionais e aos limitados dados disponíveis sobre as condições do subsolo. Nesse sentido, aumentar a segurança e minimizar a probabilidade de perder a integridade do poço e os danos ao meio ambiente são objetivos essenciais atualmente relacionados às atividades de perfuração offshore. Portanto, os projetos de poços em águas profundas devem avançar para enfrentar com segurança os desafios associados à progressão do poço e das profundidades da água. A construção segura desses poços requer a aplicação de considerações de projeto adequadas que incluam abordagens da integridade do poço para reduzir o risco de liberação não intencional de fluidos de formação (óleo, gás ou água) para o ambiente durante as operações de perfuração em águas profundas, em outras palavras a ocorrência de \"Blowout\". Neste estudo, são propostos dois projetos arquiteturais de poços em águas profundas, limitados à etapa de perfuração, que cumprem com segurança os objetivos do poço e enfrentam várias complexidades de poços em águas profundas, por exemplo janelas operacionais estreitas. Assim, dados geológicos e de perfilagem de dois poços pioneiros perfurados nas zonas de águas profundas e ultra profundas da Bacia do Ceará são usados como base para a construção e avaliação da janela operacional, para definir as profundidades da sapata do revestimento e do conjunto das barreiras do poço. Além disso, é introduzida a aplicação de pelo menos dois Conjuntos Solidários de Barreiras (CSBs) independentes para garantir a integridade do poço durante a perfuração da 4ª fase das arquiteturas dos poços propostos, como tem sido recentemente exigido no Brasil pela Agência Nacional do Petróleo (ANP), através do \"Sistema de Gerenciamento de integridade de Poços\" (SGIP).
37
Alkaragoolee, Mohammed Y. A. "Hybrid Modelling and Optimisation of Oil Well Drillstrings." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/16859.
Full textAbstract:
The failure of oil well drillstrings due to torsional and longitudinal stresses
caused by stick-slip phenomena during the drilling operation causes great
expense to industry. Due to the complicated and harsh drilling environment,
modelling of the drillstring becomes an essential requirement in studies.
Currently, this is achieved by modelling the drillstring as a torsional lumped
model (which ignores the length of the drillstring) for real-time measurement
and control. In this thesis, a distributed-lumped model including the effects of
drillstring length was developed to represent the drillstring, and was used to
simulate stick-slip vibration. The model was developed with increasing levels of
detail and the resultant models were validated against typical measured signals
from the published literature.
The stick-slip model describes the friction model that exists between the cutting
tool and the rock. Based on theoretical analysis and mathematical formulation
an efficient and adaptable model was created which was then used in the
application of a method of species conserving genetic algorithm (SCGA) to
optimise the drilling parameters.
In conclusion, it was shown that the distributed-lumped model showed improved
detail in predicting the transient response and demonstrated the importance of
including the drillstring length. Predicting the response of different parameters
along the drillstring is now possible and this showed the significant effect of
modelling the drillcollar. The model was shown to better represent real system
and was therefore far more suited to use with real time measurements.<br>Iraqi Government, Ministry of Higher Education and Scientific Research.
38
Sharrocks, Louise. "School staff perceptions of well-being and experience of an intervention to promote mental well-being." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/school-staff-perceptions-of-wellbeing-and-experience-of-an-intervention-to-promote-mental-wellbeing(1d196198-4ded-4aaf-b082-b3568777a294).html.
Full textAbstract:
Educational Psychologists (EPs) spend much of their time working with school staff to solve problems. Staff often report perceptions of high levels of stress, overwork and lack of time to plan and implement changes indicating frequent experience of poor mental well-being. There has been a recent increase in awareness of promoting the well-being of children and young people, however, little attention appears to have been focused as yet upon the school staff who will promote and support this agenda.Research in schools has tended to focus on teachers rather than including all staff. There is a preponderance of research clarifying contributors to teachers’ stress and, to a lesser extent describing interventions in schools. However, little research has focused on school staff understanding and value of well-being and about perceptions of interventions carried out in schools. This study aimed to obtain a greater understanding of the perceptions of school staff about well-being, the value they placed upon it and the experience and perceived impact of taking part in a study aiming to promote staff well-being. An 8 week intervention was carried out in a primary school with weekly sessions of a project which was known as ‘Chill and Chat’. Data was gathered via questionnaires completed before and after the project and 3 focus groups held before, during and after the project. Data was analysed using thematic analysis.It was found that well-being was seen as important, however, colleagues with poor mental well-being were ‘pathologised’. ‘Learning’ to cope and maintain positive well-being was perceived as a responsibility of the staff member. Staff perceived the informality of provision to support their well-being as important and valued the time to develop better relationships with colleagues rather than ‘working relationships’ and also feeling valued and cared for. Staff reported perceptions of greater efficacy in the classroom, increased job satisfaction and feeling calmer in the classroom. The most significant limitation of the study was the continuation of provision to support staff mental well-being which requires commitment and understanding from school senior management teams and local authority members regarding the impact that increased well being can have on teaching and learning and a shift of thought towards focusing on positive well-being promotion rather than managing poor well-being.There are implications for EP practice and research in helping school staff reflect on their well-being and actions that they can take as a team to promote well-being in school. EPs can also be instrumental in disseminating research findings highlighting the impact of staff mental well being on teaching and learning.
39
McMahon, James S. "DYNAMO systems model of the roll-response of semisubmersibles." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01262010-020130/.
Full text
40
Roy, Michael J. "Conceptualizing social enterprise as a health and well-being 'intervention'." Thesis, Glasgow Caledonian University, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687403.
Full textAbstract:
Health inequalities - the unfair and avoidable differences in health status between individuals, communities, social groups and populations - have progressively widened and deepened in recent decades, despite access to world~ class healthcare services and public health research in cities such as Glasgow. New ways of thinking about and tackling the problem are therefore constantly being sought One potentially innovative and sustainable response could be the 'social enterprise', a business that works towards social ends, rather than for the maximisation of financial returns for shareholders or investors. In the literature, the role of social enterprise in the context of health has, to date, been limited to exploring their role as an alternative provider of health services. However, by drawing upon a wide theoretical base, particularly the work of Karl Polanyi, the fields of social enterprise and public health are brought together to make the argument that by acting to address one or more aspects of social vulnerability, and achieving the means to do so in some broader trading activity, gains in health and well-being can be realised from any social enterprise, regardless of whether this is explicitly stated as part of their social mission. Following the development of an initial hypothetical model, the results of what is believed to be the first Systematic Review of empirical evidence of the impact of social enterprise~led activity on health outcomes and their social determinants are presented. An empirical phase has also been undertaken, involving interviews with practitioners from a diverse range of social enterprises around the city of Glasgow and employing methods of data analysis and theory building inspired by the critical realist philosophical stance. The study culminates in the construction of an empirically informed conceptual model, which maps plausible causal pathways between engagement with social enterprise-led activity, through to improvements in health and wellbeing. The results of this study are considered to not only encourage a broader and more imaginative consideration of what actually constitutes a public health 'intervention', but also implies that the Third Sector and other 'non-obvious' actors have an important role to play in addressing contemporary and future public health challenges.
41
Mishra, Nekkhil. "Investigation of hole cleaning parameters using computational fluid dynamics in horizontal and deviated wells." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5111.
Full textAbstract:
Thesis (M.S.)--West Virginia University, 2007.<br>Title from document title page. Document formatted into pages; contains x, 65 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 58-60).
42
Won, Suyoun. "Investigation of mud filtrate invasion using computational fluid dynamics." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=6038.
Full textAbstract:
Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains xi, 59 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 52-54).
43
Wachal, David J. Hudak Paul F. "Characterizing storm water runoff from natural gas well sites in Denton County, Texas." [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-11064.
Full text
44
Park, So Yeon. "Cultivating the Skill of Savoring: An Internet-Delivered Interventionto Promote Well-Being." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8543.
Full textAbstract:
The skill of savoring is one practice from the positive psychology literature that appears to facilitate well-being and happiness (e.g., Cazanescu, Tecuta, Candea, & Szentagotal-Tartar, 2018). Given such findings and the emerging evidence in favor of delivering positive psychology interventions via the Internet (Layous, Nelson, & Lyubomirsky, 2013), the potential feasibility of providing researched-based savoring instruction using self-directed online resources warrants empirical examination. This pilot study examined the feasibility of a self-directed online module of instruction and exercises intended to aid in cultivating individuals’ savoring abilities. The two primary aims of the present study were: 1) to examine the feasibility and preliminary outcomes of delivering an online 21-day savoring intervention through the website www.mybestself101.org (Savoring Module), and 2) to collect descriptive/qualitative feedback on the module content for further improvement of these resources. A supplemental aim was to establish convergent validity of the newly developed Savoring Questionnaire with an existing measure of savoring beliefs. Results indicated that participants completing the 21-day self-directed content and exercises in the Savoring Module reported positive and significant changes in savoring skills and subjective well-being. However, only 22% of consenting participants completed the 21-day sequence of content and exercises on their own. The majority of participants who completed the study found both the informational content and the strategies of the module to be "very helpful" or "extremely helpful." Overall, findings indicate that a self-directed savoring intervention delivered via the Internet can produce an increase in savoring skills and subjective well-being.
45
Maricic, Nikola. "Parametric and predictive analysis of horizontal well configurations for coalbed methane reservoirs in Appalachian Basin." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3703.
Full textAbstract:
Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains xiii, 149 p. : ill. (some col.), maps. Includes abstract. Includes bibliographical references (p. 149).
46
Prøsch, Kristine. "Risk in crane and lifting operations related to the logistic interaction process for well and drilling." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15570.
Full textAbstract:
This master thesis compares the logistic chain of operations and maintenance versus drilling and well and finds how drilling and well affect this chain with regards to risk on crane and lifting operations. Research has been done through accident/incident analysis, statistic, observations and interviews. An influence diagram for frequency is made, to better understanding the risk influencing factors (RIF) that affects a crane and lifting operation. The influence diagram is based on operational-, organisational-, and authority- and customer related risk influencing factors. These factors describe general causes and actors influencing the risk for frequency or consequence of a crane- and lifting operation accident. The risk influencing factors is modelled in a Bayesian Network (BN) to see how they affect the severity of incidents. To make the BN the program GenIE is used, this is a very useful program to model risk, but can be a bit complicated with regards to many influencing factors and many levels of the factor. From investigation of the logistic chain, incidents/accidents and statistics there was found: Underlying causes: Simulation and practice 38.5% Operators maintenance organisation 14% Coordination and planning 24.6% Operations, procedures and support 23% Direct causes: Human factors 35% Operational working conditions 29% Compliance 27% Physical/environmentally conditions 9 Incident: Green 96,93% Yellow 1,43% Red 1,64 When situations are at high risk (red), precautions must be taken straight away. The analysis shows that it will be most efficient to improve coordination and planning; the underlying case is reflected in all the direct causes and will affect all of them in a positive way. Some measurements will affect coordination and planning easily. A lot of misunderstandings could have been avoided if everyone had been using the same technical system, SAP, for ordering and planning. To achieve this goal everyone must learn how to use the system, and use the same part of it. A group of planners from each unit should meet once a day and work together to make one plan and inform each other about changes. For the supply vessel and installation it would have been much easier if every documentation and certification were online, this could make their planning process much easier. Then plans of where the goods should be placed could be done before the vessel enters at the supply base and the installation would have had time to prepare better for reception of the supply vessel. This should be quite easy to implement since all goods should already have a serial number in SAP: The milling machine at the installations would also make things much easier, because then not so many containers would need to be shipped to the installations and space and money would be saved.
47
Ozturk, M. Tarik. "Wellbore Temperature Assessment For Generic Deepwater Well In Blacksea And Mitigation Of Hydrate Dissociation Risk." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613601/index.pdf.
Full textAbstract:
Drilling operation expanded through deep water environments starting from mid-1980. As water depth increased, hydrate bearing formation in the shallow ocean floor is observed and that started to cause problems during drilling and production operations. Problems due to hydrate dissociation and forming during operations are also reported by the companies working in those environments many times.
Although there are several factors affect the dissociation of shallow hydrate bearing sediments, heat flux from deeper sections of the well through shallower section during the operation is the major one. In order to mitigate that risk in this study, Black Sea is taken as a reference drilling environment. Hydrate phase boundary of the region is calculated via using actual temperature and pressure data gathered during drilling operations. Generic wellbore is defined and common drilling operation sequence is simulated in this defined wellbore.
Heat transfer from section target depths to the shallow wellbore section is observed during simulations. Reducing effect of low inlet temperatures and a low circulation rate on wellbore temperatures are determined. In addition positive effect of riser boosting on depressing wellbore temperature in the well head is determined. Black Sea deep water hydrate stability zone is determined between 2210-2275m. Target depth limitation for generic well designed in drilling operations is determined as 4600m.
48
Jones, Kelly. "A positive future-focused intervention to increase individuals' subjective well-being." Thesis, Royal Holloway, University of London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521899.
Full text
49
Tavares, Rogerio Martins. "Interpretação e analise de dados de perfuração em poços de petroleo." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263676.
Full textAbstract:
Orientador: Celso Kazuyuki Morooka<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica e Instituto de Geociencias<br>Made available in DSpace on 2018-08-12T08:27:01Z (GMT). No. of bitstreams: 1
Tavares_RogerioMartins_M.pdf: 4486428 bytes, checksum: b451b4e88fa208c51397fb1846b31ebb (MD5)
Previous issue date: 2006<br>Resumo: A exploração de petróleo no mar desenvolveu-se substancialmente nas últimas décadas. Ao longo desse processo, notadamente a partir da década de 80, a quantidade de informação gerada durante a perfuração aumentou dramaticamente. Se por um lado o cenário atual apresenta informação em abundância, por outro lado existe carência de ferramentas capazes de fazer uso efetivo da informação disponível. Esta dissertação apresenta procedimentos que, através da análise e interpretação de dados de perfuração, buscam melhorar o processo de construção de poços de petróleo. Três procedimentos independentes são propostos. O primeiro consiste na utilização de um sistema de visualização para acompanhamento da perfuração direcional. A aplicação desse sistema traz benefícios para a atividade de controle da trajetória do poço. O segundo procedimento trata da utilização de um sistema automático para classificar as operações realizadas durante a perfuração de um poço de petróleo. O sistema de classificação pode ser utilizado para produzir um relatório preciso e detalhado sobre as atividades realizadas durante a perfuração. O terceiro e último procedimento diz respeito à detecção precoce de problemas de perfuração. Esse procedimento consiste em reconhecer, em tempo real nos dados de perfuração, comportamentos capazes de precocemente identificar problemas de perfuração. Através desse trabalho é possível concluir que os dados de perfuração atualmente disponíveis representam uma fonte bastante rica de informações e podem ser utilizados para melhorar o processo de construção de poços de petróleo.<br>Abstract: The offshore petroleum exploration has substantially developed in the last decades. During this process, mostly in the 80s, the amount of information generated during the drilling operation has dramatically increased. If on one hand the existing scene presents great quantity of information, on the other hand there is a lack of tools able to make effective use of the available information. This work presents procedures that, through the analysis and interpretation of drilling data, aim to improve the construction process of petroleum wells. Three independent procedures are presented. The first one concerns the use of a visualization system for tracking the execution of directional drilling operation. The utilization of this system brings benefits to the trajectory control activity. The second procedure deals with the use of an automated system to classify the activities performed during well drilling operation. The automated classification system may be used to generate a precise and detailed report considering the executed drilling activities. The third and last procedure concerns the early detection of drilling troubles. This procedure consists of recognizing online, in the drilling data, behaviors able to identify drilling problems. Through this work it is possible to conclude that the available drilling data represent a high potential source of information and can be used to improve the petroleum well construction.<br>Mestrado<br>Explotação<br>Mestre em Ciências e Engenharia de Petróleo
50
Erturk, Mehmet Cihan. "Production Performance Analysis Of Coal Bed Methane, Shale Gas, Andtight Gas Reservoirs With Different Well Trajectories And Completiontechniques." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615510/index.pdf.
Full textAbstract:
The large amount of produced oil and gas come from conventional resources all over the world and
these resources are being depleted rapidly. This fact and the increasing oil and gas prices force the
producing countries to find and search for new methods to recover more oil and gas. In order to meet
the demand, the oil and gas industry has been turning towards to unconventional oil and gas reservoirs
which become more popular every passing day. In recent years, they are seriously considered as
supplementary to the conventional resources although these reservoirs cannot be produced at an
economic rate or cannot produce economic volumes of oil and gas without assistance from massive
stimulation treatments, special recovery processes or advanced technologies.
The vast increase in demand for petroleum and gas has encouraged the new technological development
and implementation. A wide range of technologies have been developed and deployed since
1980. With the wellbore technology, it is possible to make use of highly deviated wellbores, extended
reach drilling, horizontal wells, multilateral wells and so on. All of the new technologies and a large
number of new innovations have allowed development of increasingly complex economically
marginal fields where shale gas and coal bed methane are found.
In this study, primary target is to compare different production methods in order to obtain better well
performance and improved production from different types of reservoirs. It is also be given some
technical information regarding the challenges such as hydraulic fracturing and multilateral well
configuration of the unconventional gas reservoir modeling and simulation. With the help of advances
in algorithms, computer power, and integrated software, it is possible to apply and analyze the effect
of the different well trajectories such as vertical, horizontal, and multilateral well on the future
production performance of coal bed methane, shale gas, and tight gas reservoirs. A commercial
simulator will be used to run the simulations and achieve the best-case scenarios. The study will lead
the determination of optimum production methods for three different reservoirs that are explained
above under the various circumstances and the understanding the production characteristic and profile
of unconventional gas systems.