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Dissertations / Theses on the topic 'Drilling'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Salas, Safe Jose Gregorio. "Drilling optimization using drilling simulator software." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/173.

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Drilling operations management will face hurdles to reduce costs and increase performance, and to do this with less experience and organizational drilling capacity. A technology called Drilling Simulators Software has shown an extraordinary potential to improve the drilling performance and reduce risk and cost. Different approaches have been made to develop drilling-simulator software. The Virtual Experience Simulator, geological drilling logs, and reconstructed lithology are some of the most successful. The drilling simulations can run multiple scenarios quickly and then update plans with ne

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2

Ozer, Ceren. "Hydraulics Optimization Of Foam Drilling In Drilling Operations." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12611059/index.pdf.

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ABSTRACT HYDRAULICS OPTIMIZATION OF FOAM DRILLING IN DRILLING OPERATIONS &Ouml<br>zer, Ceren M. Sc., Department of Petroleum and Natural Gas Engineering Supervisor: Assoc. Prof. Dr. Evren &Ouml<br>zbayoglu September 2009, 72 pages In drilling, drilling fluid affects every single step of operation. If rig system is thought as the human body, drilling mud can be defined as the blood system of it. Drilling fluid carries the cuttings, cools the bit, it conditions the hole and so on. Some special kinds of drilling fluids are used for special purposes such as underbalanced drilling. Underbalanced dr

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3

Eren, Tuna. "Real-time-optimization Of Drilling Parameters During Drilling Operations." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611558/index.pdf.

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Real-time optimization of drilling parameters during drilling operations aims to optimize weight on bit, bit rotation speed for obtaining maximum drilling rate as well as minimizing the drilling cost. The process is considered to be formation specific. A statistical method such as multiple linear regression technique has been used for the drilling optimization. An extensive literature survey on drilling optimization was conducted for this research study. A model is developed for this purpose using actual field data collected through modern well monitoring and data recording systems, which pred

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4

Ma, Jia. "Smart Drilling, a computer-based system for planning drilling operations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ30964.pdf.

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5

Helgeland, Leif Rune. "Drilling of Deep-set Carbonates Using Pressurized Mud Cap Drilling." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25582.

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A majority of the easy fields have already been developed, while demand for oil and gas continues to increase rapidly. Reservoirs in deep-set carbonates contains a large amount of the worlds remaining hydrocarbons and could pose as a solution for supplying the future demand. However, extracting these hydrocarbons has proven to be a daunting task. Carbonate formations are often severely fractured and karstified, leading to large or even total losses during drilling. As these fractures and caves are also the main target for gas, kicks and blow-outs are a constant threat.I

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6

Paknejad, Amir Saman. "Foam drilling simulator." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4792.

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Although the use of compressible drilling fluids is experiencing growth, the flow behavior and stability properties of drilling foams are more complicated than those of conventional fluids. In contrast with conventional mud, the physical properties of foam change along the wellbore. Foam physical and thermal properties are strongly affected by pressure and temperature. Many problems associated with field applications still exist, and a precise characterization of the rheological properties of these complex systems needs to be performed. The accurate determination of the foam properties in circ

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7

Fossum, Trygve Olav. "Analysis and control of drilling riser dynamics in dual gradient drilling." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22358.

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The aim of this thesis is to investigate a dual gradient riser system, adapted for operations in the Gulf of Mexico and subjected to first- and second-order wave forces, current and rig/vessel motion.Deep water drilling in narrow pressure zones pose several challenges for handling well pressure. Using two separate fluid volumes, in what is known as a dual gradient drilling (DGD) solution, the hydrostatic well pressure can be reduced by managing the return flow. To separate these volumes and control the mud return, the riser must accommodate a device known as a rotating control device (RCD). Th

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8

Xia, Tian. "INVESTIGATION OF DRILLING PERFORMANCE IN CRYOGENIC DRILLING ON CFRP COMPOSITE LAMINATES." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/36.

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In recent years, there has been a substantial growth in the application of carbon fiber reinforced plastic (CFRP) composite materials in automobile and aerospace industries due to their superior properties such as lightweight, high strength, excellent corrosion resistance, and minimal fatigue concerns. The present study evaluates the drilling performance of woven carbon fiber reinforced plastics under both dry and cryogenic cooling conditions using uncoated solid carbide drill with a through-hole for coolant application. The effects of the cooling conditions and the cutting parameters on drill

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9

Isaksson, Robert. "Drilling with force feedback." Thesis, Linköping University, Automatic Control, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-20897.

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<p>Industrial robots have been used for a long time in the industry. Despite this thedevelopment of advanced force control system using industrial robots is relativelylimited. Using force controlled robot systems expands the possibility of what canbe done with industrial robots.Previously a force feedback system for a standard industrial robot from ABBhas been developed. The system is developed towards the aircraft industry, where amounted drill machine on the robot has to fulfill the requirements in robot drillingin aircraft structures. This thesis presents experimental results and improvemen

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10

Sigurjonsson, Kjartan Örn. "Dual gradient drilling simulations." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18362.

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The system studied in this thesis is called the Low Rise Return system and uses a partly filled marine drilling riser with a variable mud level which is used control the bottom holes pressure.Initially main components of the Low Riser Return System are listed and explained. Then the performance characteristics of the system are explored. Level movements in riser during level increase and decrease at constant mud pump rates are explained along with the effect of mud pump rate on maximum level increase and decrease rates.A simple simulator is then presented that calculates the bottom hole pressu

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11

ABDU, JOAO PAULO SANSEVERINO. "SAFETY ASPECTS IN OFFSHORE OIL DRILLING WITH THE FLOATING MUD CAP DRILLING TECHNIQUE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36079@1.

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Frente às dificuldades de perfurar poços em reservatórios caracterizados por carbonatos fraturados e depletados, com frequente ocorrência de massivas perdas de fluido para formação e impossibilidade de manter o retorno de fluido para superfície, foi desenvolvida a técnica FMCD- Floating Mud Cap Drilling. A técnica consiste na perfuração com bombeio contínuo de fluido pela coluna de perfuração e também pelo anular do poço, injetando todo fluido e formação cortada pela broca para o reservatório. Na técnica convencional de perfuração, o fluido é bombeado pela coluna e retorna pelo anular, sendo p

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12

Wang, Yiwen. "Study on the Rheology of Drilling Fluid and Its Impact on Drilling Operation." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/77985.

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Optimisation and automation is becoming an integral part of drilling workflow in which, drilling fluid rheology is an important component. The objective of this thesis was to study the fluid rheology in more depth using different measurement methods. A series of experiments were conducted to ascertain the synergic interaction of low-end viscosifiers to enhance drilling fluid properties. Furthermore, rheological experiments were performed to investigate the effect of fine particles on the rheology of mono-dispersed suspensions.

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13

Gao, Wei, and 高偉. "Development and application of drilling process monitoring methodologyfor hydraulic rotary drilling in ground investigation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41508993.

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14

Gransell, Fredrik. "Decision analysis: determining the most appropriate drilling method for production drilling in underground mining." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-22506.

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The mining industry contains many factors with a high degree of uncertainty. Therefore, there is a need for decision analysis. The production drill process is an initial process in underground mining, thus it is important that the most appropriate drilling method is used for specific mining operations. The current study provides examples of important variables that can be used in the decision analysis of the given decision problem. Drill methods included in the decision analysis are hydraulic top-hammer, pneumatic, and hydraulic down-the-hole hammers. Monte Carlo simulations are used as decisi

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15

Park, Junho. "Nonlinear Model Predictive Control for a Managed Pressure Drilling with High-Fidelity Drilling Simulators." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6792.

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The world's energy demand has been rapidly increasing and is projected to continue growing for at least the next two decades. With increasing global energy demand and competition from renewable energy, the oil and gas industry is striving for more efficient petroleum production. Many technical breakthroughs have enabled the drilling industry to expand the exploration to more difficult drilling such as deepwater drilling and multilateral directional drilling. For example, managed pressure drilling (MPD) offers ceaseless operation with multiple manipulated variables (MV) and wired drill pipe (WD

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16

Råen, Jostein. "Managing pressure during underbalanced drilling." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18395.

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AbstractUnderbalanced drilling has received more and more attention in recent years. The reason for that may be because many oil fields, especially on the Norwegian continental shelf, have started to show signs of aging. By that I mean that the production is going down, and reservoir pressure is more and more reduced. Underbalanced drilling is a technique that is suitable for dealing with these challenges. The major benefits like for example reduced reservoir damage, and the ability to drill through narrow pressure windows, both help in prolonging the life of mature fields. To be able to perfo

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17

Roukema, Jochem Christiaan. "Mechanics and dynamics of drilling." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/31059.

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This thesis presents the mathematical modeling of drilling mechanics and dynamics in order to improve hole shape accuracy, optimize the drill tool geometry and drilling operations. The thesis presents prediction of cutting forces, torque, power, vibrations and hole shape as a function of drill edge geometry, work material dependent cutting coefficients, drill structure and drilling conditions. The forces and torque are expressed as a function of chip load distribution along the cutting edge and cutting force coefficients. As the drill rotates and thrusts into the material, it experiences

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18

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.

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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 o

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Hollensteiner, Erwin. "Drilling attitude determination and control." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555799.

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This thesis is concerned with the development of a new robust and efficient real time signal processing algorithm for a rotating strapdown inertial navigation system (INS). Although the signal processing in INS is dominated by the Kalman filter algorithm, often this algorithm is not feasible for small microcontroller or digital signal processor (DSP) applications. This thesis develops a new fixed point DSP algorithm for cal- culating the optimal estimate of orientation of the INS. In this thesis Kalman filter algorithms in INS are discussed. A filter algorithm for a rotating inertial navigatio

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20

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.

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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.

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21

Fasheloum, Mohammed. "Investigation of drilling parameters indicators." Thesis, University of Nottingham, 1997. http://eprints.nottingham.ac.uk/11885/.

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The factors which influence the performance characteristics of diamond impregnated core bits and roller cone bits are examined, and actual field drilling data are analysed to determine these factors. Methods for selecting the appropriate bit type for optimised drilling are also highlighted. The importance of core drilling to the exploration and exploitation of the earth's natural resources and to the integrity of engineering structures is highlighted. An investigation of the slim hole continuous core drilling system and its application in the oil and gas exploration is analysed. The highly suc

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22

Pitt, Martin John. "Vibratory screening of drilling fluids." Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/10642.

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23

Gao, Wei. "Development and application of drilling process monitoring methodology for hydraulic rotary drilling in ground investigation." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41508993.

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24

Camallanqui-Alborque, C., G. Quispe, and C. Raymundo-Ibañeez. "Controlled Trim-Blasting Model to Improve Stability and Reduce Vibrations at a Production Gallery of the San Ignacio de Morococha S.A.A. Mining Company." IOP Publishing Ltd, 2019. http://hdl.handle.net/10757/656296.

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This paper presents a blasting method called controlled trim blasting, in which the rock mass of an unstable gallery where high levels of vibration have been detected is analyzed. This methodology comprises a drilling mesh with two-contour gallery assessment, producing its drilling machines and determining the type of explosive used and burden and spacing, which will be detonated after the internal blasting. Further, the internal blasting will possess its drilling machines, burden, spacing, and a second type of explosive. The separation of the gallery into smaller parts will improve the blasti

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Tamura, Mariana Tiemi. "An assessment of the drilling process employed by the hole-drilling method for residual stress measurements." reponame:Repositório Institucional da UFSC, 2016. https://repositorio.ufsc.br/xmlui/handle/123456789/167751.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2016.<br>Made available in DSpace on 2016-09-20T04:16:54Z (GMT). No. of bitstreams: 1 339489.pdf: 89627893 bytes, checksum: 27264112985d98d934df23ec5f7ae7d2 (MD5) Previous issue date: 2016<br>Abstract: Predictive maintenance is important to prevent catastrophic accidents inoil and gas distribution networks, since failures in pipelines and other mechanical components may lead to serious economic and environmental consequences. A possible approac

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26

Martin, Matthew Daniel. "Managed pressure drilling techniques and tools." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3884.

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The economics of drilling offshore wells is important as we drill more wells in deeper water. Drilling-related problems, including stuck pipe, lost circulation, and excessive mud cost, show the need for better drilling technology. If we can solve these problems, the economics of drilling the wells will improve, thus enabling the industry to drill wells that were previously uneconomical. Managed pressure drilling (MPD) is a new technology that enables a driller to more precisely control annular pressures in the wellbore to prevent these drillingrelated problems. This paper traces the history of

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27

Stamnes, Øyvind Nistad. "Nonlinear Estimation with Applications to Drilling." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12500.

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This thesis addresses the topic of nonlinear estimation and its applications. Particular emphasis is given to downhole pressure estimation for Managed Pressure Drilling (MPD), but due to the mathematical similarities of the two problems, velocity estimation for mechanical systems is also considered. The thesis consists of the following three parts:Part I of this thesis addresses the problem of pressure estimation for MPD systems. Over the last decade MPD has emerged as a tool for drilling offshore wells with tight pressure margins. Several technologies for MPD have been developed and this the

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Davidson, Sean R. H. "Heat transfer in bone during drilling." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ46070.pdf.

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29

Zhang, Zhiwei. "Modelling of ultrasonically assisted micro drilling." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6918.

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Micro drilling has been applied in the interconnection and precision manufacturing industries extensively. As a promising machining technique, Ultrasonically Assisted Drilling (UAD) has become increasingly popular in both academia and industry in recent years. In this thesis, modelling techniques and experiments for Ultrasonically Assisted Micro Drilling (UAMD) are investigated. Representative work on modelling of micro drills and UAD has been documented and categorised. Existing gaps in the literature are identified and the aims of this research are formulated. Using the Finite Element (FE) t

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Ng, Gary K. L. "Quality control in laser percussion drilling." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488033.

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31

李英傑 and Ying-kit Li. "Management of radon in tunnel drilling." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31255231.

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32

Rowsell, Philip J. "The automatic optimisation of drilling performance." Thesis, University of Nottingham, 1991. http://eprints.nottingham.ac.uk/11909/.

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The drilling industry, along with many others, is becoming increasingly competitive, demanding greater efforts to improve safety and reduce costs. For this reason, companies are progressively looking towards computerised automation to enhance performance. Unlike most industries however, the drilling industry has been slow to take advantage of the advances in computer and automation technology. Only recently have automatic operations such as tubular handling been placed under computer control. These activities relate to peripheral mechanical handling problems which are relatively easy to solve.

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Gardelin, Sara, and Madeleine Odebring. "Development of a Multi-Drilling Device." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182904.

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Täby Brandskyddsteknik AB is a company that provides a service of fire-proofing tunnels by mounting fire-protection boards to the walls and the ceiling of the tunnel. The installation is done by drilling holes through the board and into the concrete and then hammering bolts into these holes. To reach the ceiling the installers use a scissor-lift. The drilling phase of the installation process is very strenuous work and entails vibrations from the hammer drill and a work posture with the hands raised above the shoulders. To lessen the strain on the installers and to reduce the installation time

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Voisey, Kathleen Theresa O'Sullivan. "Laser drilling of metals and ceramics." Thesis, University of Cambridge, 2002. https://www.repository.cam.ac.uk/handle/1810/272329.

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Miller, Duncan Edmund. "Rock Drilling with impregnated diamond microbits." Thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/4962.

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A fully instrumented laboratory drilling rig was designed and used to drill a variety of rock types with impregnated diamond microbits. The rocks, selected to represent a wide range of properties, were characterised by optical petrography and by the measurement of uniaxial compressive strength and relative abrasion resistance. A computer controlled electronic data logging system was used to record the power consumption, the rotational velocity, the bit thrust, the torque and the penetration rate. Tests were conducted under set thrust and under set rate of advance conditions to determine the ef

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36

Cole, Ian. "Mist Characterization in Drilling 1018 Steel." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc149573/.

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Minimum quantity lubrication replaces the traditional method of flood cooling with small amounts of high-efficient lubrication. Limited studies have been performed to determine the characteristics of mist produced during MQL. This study investigated the mist concentration levels produced while drilling 1018 steel using a vegetable based lubricant. ANOVA was performed to determine whether speed and feed rates or their interactions have a significant effect on mist concentration levels and particle diameter. It was observed that the concentration levels obtained under all four speed and feed ra

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Åkerlund, Elin, Rebecka Havo, Åberg Jakob Jonsson, Patrik Österberg, and Mikael Fredriksson. "High Performance Steel for Percussive Drilling." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323387.

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Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt mar

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Åkerlund, Elin, Åberg Jakob Jonsson, Patrik Österberg, Rebecka Havo, and Mikael Fredriksson. "High Performance Steel for Percussive Drilling." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323808.

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Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m^1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt ma

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Li, Ying-kit. "Management of radon in tunnel drilling /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2543892x.

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DeSilva, Sirilath. "Transient axisymmetric model for laser drilling." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289927.

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A transient axisymmetric model is developed to study the laser drilling phenomenon. Governing equations are the transient axisymmetric 3-D heat conduction equation for the solid substrate and for the liquid molten part, the thin layer model (TLM) equations are utilized. Boundary element method (BEM) is used for the region encompassing the moving boundary and finite difference method (FDM) is utilized for the remainder. BEM and FDM are coupled using flux and temperature at their interface. TLM is obtained using simplified free surface, mass, momentum and energy equations in body intrinsic coord

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41

Williams, A. Lynn. "Implementing intervention with fidelity: Drilling down." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etsu-works/2014.

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42

McLaughlin, Jim. "ORTHOPEDIC DRILLING & THERMAL INJURY ANALYSIS." Master's thesis, Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/512272.

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Mechanical Engineering<br>M.S.M.E.<br>In orthopedic surgery, fixation pins are used to provide stability of bone segments to ensure proper healing. The drilling process to implant these pins can generate a considerable amount of heat. Raising the temperature of bone tissue above 47°C for a prolonged amount of time can cause cell death in a process called thermal osteonecrosis. Should bone tissue surrounding implants like fixation pins die and begin to break-down, the stability of said implants becomes at risk for failure. The failure of a surgical implant can be costly, resulting in additional

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Zarif, Karimi Navid <1988&gt. "Analysis of drilling of composite laminates." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8503/1/ANALYSIS%20OF%20DRILLING%20OF%20COMPOSITE%20LAMINATES.pdf.

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This dissertation deals with the characterization, modeling, and monitoring of drilling process of composite materials through various experimental and analytical investigations. Analytical models were developed which predicts critical thrust force and feed rate above which the delamination crack begins to propagate in the drilling of multi-directional laminated composites. The delamination zone was modeled as a circular plate, with clamped edge and subjected to different load profiles. Based on fracture mechanics, classical laminate theory and orthogonal cutting mechanics, expressions were o

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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.

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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.

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菅原純 and Jun Sugawara. "Development and applications of a drilling process monitoring system for pneumatic drills." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B30409184.

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Allan, Peter Gerard. "Development of a self-boring pressuremeter for the in situ testing of weak rocks." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238944.

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48

Sugawara, Jun. "Development and applications of a drilling process monitoring system for pneumatic drills /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25139460.

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49

Maolin, Liao. "Dynamic methods of stiffness identification in impacting systems for rotary-percussive drilling applications." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=230156.

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Abstract:

Stiffness identification of an impacted constraint is the main issue discussed in this thesis. Primarily, a change of stability (bifurcation) is used to determine the dynamical stiffness of an impacted beam for a piecewise-linear impact oscillator. Detailed one- and two-parameter bifurcation analyses of this impacting system are carried out by means of experiments and numerical methods. Particularly, the two-parameter numerical continuation of the obtained codimension-one bifurcation (period-doubling bifurcation, or fold bifurcation) indicates a strong monotonic correlation between the stiffne

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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.

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