Bibliografie tematiche / Directional well

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Letteratura scientifica selezionata sul tema "Directional well"

Autore: Grafiati
Pubblicato: 28 maggio 2022

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Articoli di riviste sul tema "Directional well"

1

Mucha, Piotr Bogusław, e Piotr Rybka. "Well posedness of sudden directional diffusion equations". Mathematical Methods in the Applied Sciences 36, n. 17 (9 aprile 2013): 2359–70. http://dx.doi.org/10.1002/mma.2759.

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2

Wang, Jiangtao, Longlong Qian, Songwei Wang, Li Shi e Zhizhong Wang. "Directional Preference in Avian Midbrain Saliency Computing Nucleus Reflects a Well-Designed Receptive Field Structure". Animals 12, n. 9 (28 aprile 2022): 1143. http://dx.doi.org/10.3390/ani12091143.

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Abstract (sommario):
Neurons responding sensitively to motions in several rather than all directions have been identified in many sensory systems. Although this directional preference has been demonstrated by previous studies to exist in the isthmi pars magnocellularis (Imc) of pigeon (Columba livia), which plays a key role in the midbrain saliency computing network, the dynamic response characteristics and the physiological basis underlying this phenomenon are unclear. Herein, dots moving in 16 directions and a biologically plausible computational model were used. We found that pigeon Imc’s significant responses for objects moving in preferred directions benefit the long response duration and high instantaneous firing rate. Furthermore, the receptive field structures predicted by a computational model, which captures the actual directional tuning curves, agree with the real data collected from population Imc units. These results suggested that directional preference in Imc may be internally prebuilt by elongating the vertical axis of the receptive field, making predators attack from the dorsal-ventral direction and conspecifics flying away in the ventral-dorsal direction, more salient for avians, which is of great ecological and physiological significance for survival.
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3

Li, Kun Yuan, Yan Mei Zhang e Jun Liu. "Application of Computer in the Directional Well Technology". Applied Mechanics and Materials 513-517 (febbraio 2014): 2835–38. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.2835.

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The directional well technology is developing with the increasing demand for energy, and the computer science plays an important role, which not only decrease the design time of the directional well, but also improve the drilling accuracy. The application of computer in rotary steering system makes it possible to realize the intelligent Directional well system.
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4

Weinert-Rączka, E., e R. Iwanow. "Multiple Quantum Well Directional Coupler with Photorefractive Grating". Acta Physica Polonica A 99, n. 1 (gennaio 2001): 175–81. http://dx.doi.org/10.12693/aphyspola.99.175.

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5

Bagazeev, Viktor, Niyaz Valiev, Konstantin Kokarev e Vasiliy Startsev. "Method of placer mining by directional well drilling". E3S Web of Conferences 56 (2018): 01022. http://dx.doi.org/10.1051/e3sconf/20185601022.

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The study aims at justifying the method for the development of placers by directed drilling of wells. A description is given of the opening of the site, the receding and oncoming scheme of the digging excavation, drilling and expansion of the wells, the main hydraulic unit with remote control. The physics-mechanical substantiation of technological parameters is given: hydro-jet erosion, the shape and size of the cleaning chambers, the adaptation of hydrotransport calculation methods. With jetting, the required flow rate and pressure of water to break rocks is based on the laws of soil mechanics. The parameters of the clearing space and the shape of the chambers are taken in accordance with the magnitude of the vault of natural equilibrium. As a determining factor in the calculation of gravity hydrotransport, the consistency of the pulp is adopted with observance of the condition necessary for the bearing capacity. To adapt the methodology for calculating the hydraulic lifting of pulp to the conditions of well development, the coefficient of dilution is taken as the main design parameter. Modeling of jetting jet in the laboratory conditions was carried out, dependences of decrease in axial pressure were obtained at removal of the face from the nozzle.
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6

Zucker, J. E., K. L. Jones, M. G. Young, B. I. Miller e U. Koren. "Compact directional coupler switches using quantum well electrorefraction". Applied Physics Letters 55, n. 22 (27 novembre 1989): 2280–82. http://dx.doi.org/10.1063/1.102037.

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7

Gang, Mingchao, Weiyi Xie, Honglin Luo, Shengshan Chen, Yanjie Cui, Yi Su e Rui Wang. "Simulation of directional well trajectory using tension spline". Journal of Physics: Conference Series 1074 (settembre 2018): 012013. http://dx.doi.org/10.1088/1742-6596/1074/1/012013.

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8

Shen, M. Y., R. Asayama, T. Goto e T. Yao. "Directional luminescence from quantum dots in quantum well". Journal of Applied Physics 93, n. 5 (marzo 2003): 2957–61. http://dx.doi.org/10.1063/1.1543632.

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9

Carpenter, Chris. "Deep Directional Electromagnetic Technique Improves Well-Drilling Efficiency". Journal of Petroleum Technology 73, n. 10 (1 ottobre 2021): 51–52. http://dx.doi.org/10.2118/1021-0051-jpt.

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Abstract (sommario):
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 202265, “Leap of Faith From Conventional to EM Look-Ahead: A Game-Changing Technology To Improve Well Efficiency,” by Muhamad Yanuar Mahardi, Hendarsyah Hendarsyah, and Kharisma Endarmoyo, PT Pertamina, et al., prepared for the 2020 SPE Asia Pacific Oil and Gas Conference and Exhibition, originally scheduled to be held in Perth, Australia, 20–22 October. The paper has not been peer reviewed. The structure in the Matindok block in Central Sulawesi operated by Pertamina has proven producible gas reserves in the Minahaki formation. One of the main challenges in this area is the low resolution of seismic data, leading to a high depth uncertainty. The complete paper describes a technology developed to meet these challenges with the capability to map and detect lithology changes ahead of the bit in real time. Geological Background A first exploration well, PEP-001, was drilled in 2018. The structure has a Miocene carbonate buildup play, and the target reservoir is the M pinnacle carbonate reef. The PEP-001 well was planned to set the 9⅝-in. casing point above the top of the M formation. Offset wells did not show any clear markers in the thick shale above the M formation that could have been used for log correlation. In previously drilled offset wells, correlation was performed convention-ally by examination of cutting samples and on drilling breaks. However, when Well PEP-001 was drilled, no apparent drilling break was observed. By the time cuttings reached the surface, the bit had drilled into 20 m of the M formation. Because the casing covered most of the upper carbonate formation, openhole logging and well-testing data were not acquired to delineate the target formation optimally. The second exploration well, PEP-002, was planned with an objective of setting 9⅝-in. casing approximately 5 m above the top of M to acquire full-interval coverage of coring, openhole wireline logging, and well testing. This information was critical for optimal reservoir delineation to allow for accurate reserves calculation and future development. Conventional correlation methods have proven insufficient for casing point placement. The presence of limestone stringers in offset wells within proximity of the top of M presented an additional challenge. The stringers could have been misinterpreted as the main carbonate body, if interpretation were based solely on cutting samples. Real-Time Electromagnetic (EM) Look-Ahead Technology
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10

Chudyk, I. I., A. M. Livinskyi, Akhmed Al Tanakchi e A. M. Pastuch. "THE APPLICATION FEATURES OF DIRECTIONAL BHAS WHILE DRILLING DIRECTIONAL WELLS". Prospecting and Development of Oil and Gas Fields, n. 1(70) (29 marzo 2019): 17–24. http://dx.doi.org/10.31471/1993-9973-2019-1(70)-17-24.

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Abstract (sommario):
The article presents a scientific and practical approach to assessing the energy efficiency of directional bottom hole assembly on the basis of the mud motor. The main design feature of these assemblies is the presence of a bent angle in the spindle section of the mud motor. The conditions of operation of such assemblies are considered for a combined drilling method with a various number of stabilizers. Particular attention is paid to determining the causes of unproductive energy costs on the work of the directional bottomhole assemblies in the borehole.The mathematical model improved by the authors includes the geometric features of the assembly design, the bent angle of the spindle of the mud motor as to its body, the number of the stabilizers and the location of their installation, the borehole inclination angle, the physical and mechanical characteristics of the subsurface rock that forms it. The authors calculated the energy consumption for rotation and the axial displacement of the assemblies in the directional well taking into account the deflection forces on the bit and the reaction on the stabilizers. The researchers suggest the use of the indicator of specific energy costs to overcome the forces and moments of the environment resistance during the work of the directional assemblies using the method of combined drilling.Using the results of analytical research and the developed approach the authors study energy costs for thework of the directional bottom hole assemblies with a various number of the stabilizers. The study is conducted for the slick assemblies, as well as for assemblies with one- and two-stabilizers. It is established that directional assemblies with one stabilizer are characterized by the highest values of the forces of resistance of axial displacement and rotation in the directional well. As they are high-torque, energy-consuming and the most energy-intensive systems, their practical use is limited. The main factors in the formation of energy costs for the work of directional assemblies while applying the combined drilling method are the number of the stabilizers and the inclination range.
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Più fonti

Tesi sul tema "Directional well"

1

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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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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3

Кунцяк, Р. Я. "Удосконалення технолгії буріння похило-скерованих та горизонтальних свердловин в нестійких породах (на прикладі родовищ Дніпрово-Донецької западини)". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2011. http://elar.nung.edu.ua/handle/123456789/1916.

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Abstract (sommario):
Дисертація присвячена удосконаленню технології і конструкцій КНБК для буріння похило-скерованих і горизонтальних стовбурів з великими зенітними кутами в нестійких породах нафтогазових родовищ ДЦз та шельфу Чорного моря. В результаті аналітичних, експериментальних і промислових досліджень встановлено наявність значень критичного кута з точки зору втрати стійкості стінок похило-скерованих свердловин у процесі буріння в нестійких породах, визначено діапазон граничних значень інтенсивності викривлення у вказаних породах. Отримано аналітичну залежність передачі осьового навантаження на долото від значення зенітного кута та інтенсивності викривлення свердловини. Розроблено і виготовлено ексцентричні протиприхоплюючі перехідники, що становлять основу компоновки низу бурильної колони, яка запобігає прилипанню бурильних труб до нижньої стінки свердловини і забезпечує доведення осьового навантаження до долота. Удосконалено технологію буріння похило-скерованих і горизонтальних свердловин в нестійких породах. Вказана технологія випробувана і широко впроваджена у процесі буріння похило-скерованих і горизонтальних свердловин на родовищах ДДз та шельфі Чорного моря.
The thesis deals with the improvement of technology and bottom-hole assembly designs for drilling directional and horizontal boreholes with large inclination angles in unstable rocks of oil and gas fields of the Dnipro-Donetsk depression and Black Sea offshore zone. The main thesis issues are published in 19 academic papers. As a result of analytical, experimental and industrial researches the critical angle values in terms of directional wellbore walls stability loss in the process of drilling in unstable rocks were determined and, under the same conditions, the deviation intensity limit value scope in those rocks was measured. The analytical dependence of bit thrust load transmission on the value of inclination angle and well deviation intensity was detected. Eccentric antitack reducers that are the basis of bottom-hole assembly which prevents drill pipes sticking to the bottom wellbore wall and provides thrust load transmission to the bit were developed and produced . These results contributed to the improvement of directional and horizontal wells drilling technology in unstable rocks. The technology was tested and introduced on a large scale for drilling directional and horizontal wells of the Dnipro-Donetsk depression and Black Sea offshore zone.
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4

Ettehadi, Osgouei Reza. "Rate Of Penetration Estimation Model For Directional And Horizontal Wells". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608737/index.pdf.

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Abstract (sommario):
Directional and horizontal drilling operations are increasingly conducted in all over the world, especially parallel to the growth of the technological developments in the industry. Common application fields for directional and horizontal drilling are in offshore and onshore when there is no way of drilling vertical wells. During directional and horizontal well drilling, many additional challenges occur when compared with vertical well drilling, such as limited weight on bit, harder hole cleaning, trajectory control, etc. This makes even harder to select the proper drilling parameters for increasing the rate of penetration. This study aims to propose a rate of penetration model considering many drilling parameters and conditions. The proposed model is a modified Bourgoyne &
Young&rsquo
s model which considers formation compaction, formation pressure, equivalent circulating density, and effective weight on bit, rotation of the bit, bit wear, hole cleaning, inclination, fluid loss properties and bit hydraulics. Also, a bit wear model is developed for roller cones and PDCs. The model performance is tested using field data obtained from several directional and horizontal offshore wells drilled at Persian Gulf. It is observed that the model can estimate rate of penetration with an error of ±
25 % when compared with the field data.
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5

Ocean, Neel. "New directions in behavioural economics : essays on personality and well-being". Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/88963/.

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Abstract (sommario):
This thesis is divided into two parts, each consisting of two self-contained chapters. The first part provides new findings in the economics of personality, and well-being. Chapter 1 studies the implications of ‘personality mismatch’. Mismatch in labour economics has generally been treated as a ‘black box’. Therefore, the well-being impact on a poorly matched worker is not well understood. I find that workers whose personalities are more poorly matched to the requirements of their job have substantially lower levels of life satisfaction, and a lower wage. Chapter 2 is the first study that attempts to uncover the determinants of well-being prioritisation. There is no consistent evidence of variation in priorities over the life cycle. Life satisfaction is the most valued aspect of well-being throughout life, yet people overestimate the relative value placed by others on happiness. Well-being prioritisation is strongly influenced by well-being levels and by individual fixed effects such as personality, health level, and smoking frequency. The second part of this thesis explores two novel ideas previously unconsidered. It represents a first attempt at providing some insight to these issues. Chapter 3 develops a model describing how consumers might adjust for a potential bias in extreme online review scores. A randomised experiment finds that individuals do not seem to be making such adjustments. Hence, there are negative implications for consumer welfare from false or biased extreme reviews. Finally, Chapter 4 is an ambitious investigation into how personality characteristics of workers within an economy may influence the composition of its industrial output. Big Five personality factors are predictive of future industry change, but further work needs to be done to verify this. This work highlights the relevance of personality data in the analysis of long-standing economic issues.
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6

Мартинюк, Д. М. "Вдосконалення породоруйнівних інструментів різальної дії для буріння похило-скерованих і горизонтальних свердловин". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2007. http://elar.nung.edu.ua/handle/123456789/4194.

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Abstract (sommario):
Дисертацію присвячено розробці породоруйнівних інструментів різальної дії, оснащених полікристалічними алмазними різцями, для буріння вибійними двигунами похило-скерованих та горизонтальних свердловин. Основні положення дисертації опубліковані 13 наукових працях. В результаті аналітичних і промислових досліджень визначено, що для покращення техніко-економічних показників будівництва похило-скерованих та горизонтальних нафтогазових свердловин з використанням вибійних двигунів, необхідне створення породоруйнівних інструментів різальної дії пониженої енергоємності буріння. На основі теоретичних і експериментальних досліджень бурових доліт різальної дії встановлені залежності енергетичних параметрів їх роботи від форми профілю та кількості лопатей, які дозволяють запропонувати найбільш раціональні конструкції робочої частини породоруйнівних інструментів для заданих умов буріння похило-скерованих та горизонтальних свердловин. Розроблено математичну модель і експериментально визначено емпіричні коефіцієнти для розрахунків прогнозних енергетичних параметрів роботи породоруйнівних інструментів різальної дії з різними формами робочої частини. Успішно випробувано й впроваджено при будівництві вибійними двигунами похило-скерованих та горизонтальних свердловин дві конструкції бурових доліт і чотири конструкції бурильних головок з запропонованим для заданих умов буріння найменш енергоємним профілем різальної частини.
Диссертация посвящена разработке породоразрушающих инструментов режущего действия, оснащенных поликристаллическими алмазными резцами, для бурения забойными двигателями наклонно-направленных и горизонтальных скважин. Основные положения диссертации опубликованы в 13 научных работах. В результате аналитических и промысловых исследований определено, что для улучшения технико-экономических показателей строительства наклонно-направленных и горизонтальных скважин с использованием забойных двигателей, необходимо создание породоразрушающих инструментов режущего действия пониженной энергоемкости бурения. Не смотря на то, что технико-экономические показатели работы породоразрушающих инструментов, оснащенных ПАР, превышают показатели шарошечных конструкций, сфера применения долот режущего действия в направленном бурении ограничена из-за осложнений, которые возникают при их использовании с забойными двигателями и попытках оперативного управления траекторией скважины. Связаны они с повышенным рабочим крутящим моментом, который резко изменяется в широком диапазоне даже при незначительных колебаниях осевой нагрузки при бурении чередующихся по прочности горных пород. Это приводит к проворачиванию забойного двигателя, или его остановке, что делает невозможным текущее управление траекторией бурения и существенным образом снижает технико-экономические показатели проходки. Поэтому, на момент постановки данных исследований, в направленном бурении традиционными технико-технологическими средствами большинство работ, которые связаны с набором угла, исправлениями траектории скважины, проведением наклонных и горизонтальных стволов, осуществляются с использованием шарошечных долот. Теоретически исследовано конструкции режущей части долота с пониженной энергоемкостью разрушения горных пород. Разработаны технические средства и методика проведения экспериментов. Проведены экспериментальные стендовые исследования долот с разными формами лопастей: плоской, обратно-конусной, эллиптической и круглоступенчатой. Определение показателей работы долот с исследуемыми профилями режущей части проводили в два этапа: на первом использовали в качестве забоя мрамор «коелга», на втором -цементные блоки. При проведении экспериментов осуществляли ступенчатое изменение параметров режима бурения, величины которых составляли: осевая нагрузка - 15; 20; 25; 30 кН; угловая скорость вращения долота - 1; 2; 3; 4 с-1. На основе теоретических и экспериментальных исследований буровых долот режущего действия установлены зависимости энергетических параметров их работы от формы профиля и количества лопастей, которые позволили предложить наиболее рациональные конструкции рабочей части породоразрушающих инструментов для заданных условий бурения наклоннонаправленных и горизонтальных скважин. Предложено круглоступенчатую форму профиля режущей части долота, в которой с целью уменьшения энергоемкости работы расстояние от оси вращения инструмента до точек соединения криволинейных сегментов меньше их наибольших радиусов. Соответствующая конструкция долота защищена авторским свидетельством на изобретение №1783108, а ее эффективность подтверждена экспериментальными и промысловыми исследованиями. Экспериментальными исследованиями установлено, что изменение количества лопастей незначительно влияет на энергоемкость работы породоразрушающих инструментов режущего действия. Следовательно, для бурения горных пород разной твердости целесообразно разрабатывать долота с числом лопастей, которое определяется фактором необходимой износостойкости. Разработана математическая модель и экспериментально определены эмпирические коэффициенты для расчетов прогнозных энергетических параметров работы породоразрушающих инструментов режущего действия с различными формами рабочей части. Предложена форма рабочей поверхности бурового долота, в которой для уменьшения энергоемкости бурения режущая часть выполнена в виде криволинейных сегментов, которые у соседних лопастей расположены на разных расстояниях от торца, и обратных клиньев с вершинами на оси вращения инструмента. Указанная форма долота защищена патентами Украины №3846 и Российской Федерации №42571. Изготовление опытных образцов и партий породоразрушающих инструментов с пониженной энергоемкостью бурения (четырех конструкций буровых долот и пяти - бурильных головок) организованно и осуществлено на Экспериментальном заводе Института сверхтвердых материалов им. В.М. Бакуля НАН Украины. Промысловые испытания и внедрение разработанных породоразрушающих инструментов осуществляли на нефтегазовых месторождениях ОАО «Укрнефть» и ОАО «Татнефть». Успешно испытано и внедрено при строительстве наклонно-направленных и горизонтальных скважин две конструкции буровых долот и четыре конструкции бурильных головок с предложенной для заданных условий бурения наименее энергоемкой формой режущей части.
The dissertation is devoted to development of PDC (polyciystalline diamond compact) bits for drilling of directional and horizontal wells. There are 13 scientific works, which contain main results of researches. Analytical researches and field tests indicate a necessity of PDC bit designs for overall economics improvement of drilling directional and horizontal wells with a downhole motor application. Development of the fixed cutter bit designs with low energy consumption is necessary. On the basis of theoretical and experimental researches are found the relations between drilling energy parameters and fixed cutter bit designs (profile and quantity of blades). That helps to design PDC bits for drilling directional and horizontal wells pursuant to given conditions. The mathematical model for energy parameter calculations of a PDC bit activity is improved. Experimentally trial-and-error factors for different form of PDC bits are determined. Two PDC bit designs and four core bit designs with low energy consumption at drilling by downhole motors of directional and horizontal wells were successfully tested and introduced.
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7

Марцинків, О. Б. "Підвищення надійності роботи обсадних колон у похило-скерованих свердловинах". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2010. http://elar.nung.edu.ua/handle/123456789/4376.

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Дисертація присвячена підвищенню надійності роботи обсадних колон у похило-скерованих свердловинах завдяки врахуванню впливу згину на овальність обсадних труб та на величину зовнішнього критичного тиску. Проаналізовано чинники, що впливають на надійність роботи обсадних колон при кріпленні похило-скерованих свердловин, та виконано огляд методів розв’язання зазначеної проблеми. Уточнено класифікацію причин неякісного кріплення похило-скерованих свердловин. Проведено теоретичні дослідження впливу згину обсадної колони на овальність і міцність обсадних труб при дії зовнішнього надлишкового тиску. Для оцінки напруженого стану обсадних труб і форми їх поперечного перерізу при згині виконано експериментальні дослідження, якими підтверджено результати теоретичних досліджень впливу згину труб на форму їх поперечного перерізу і необхідність удосконалення методики розрахунку обсадних колон для кріплення похило-скерованих свердловин. Удосконалено методику розрахунку обсадних колон на міцність при кріпленні похило-скерованих свердловин шляхом уведення поправочного коефіцієнта до величини зовнішнього критичного тиску залежно від інтенсивності викривлення, товщини стінки, діаметра труб і групи міцності сталі. Розроблено рекомендації з підвищення надійності роботи обсадних колон для кріплення похило-скерованих свердловин, що грунтуються на удосконаленій методиці їх розрахунку залежно від інтенсивності викривлення свердловини.
Диссертация посвящена повышению надежности работы обсадных колонн в наклонно-направленных скважинах благодаря учету влияния изгиба на овальность обсадных труб и их сопротивляемость наружному избыточному давлению. Проанализированы факторы, влияющие на надежность работы обсадных колонн при креплении наклонно-направленных скважин и сделан обзор методов решения указанной проблемы. Усовершенствована классификация причин некачественного крепления наклонно-направленных скважин, согласно которой они объединены в две группы: - факторы, приводящие к повреждению обсадных колонн; - факторы, обуславливающие недопуск обсадных колонн до проектной глубины и их смещение в месте стыковки секций. Проведены теоретические исследования влияния изгиба обсадной колонны на овальность и прочность обсадных труб при действии наружного избыточного давления. Показано, что с увеличением кривизны обсадной колонны овальность поперечного сечения труб увеличивается. Например, для 146-мм обсадных труб с начальной овальностью 1 % при интенсивности искривления (2÷З) градуса на 10 м, овальность поперечного сечения обсадных труб увеличивается на (0,1÷0,3) %, а при интенсивности искривления (6÷7) градусов на 10 м - на (0,6÷0,8) %. Расчетами установлено, что величина наружного критического давления уменьшается с увеличением интенсивности искривления скважины. Для 146-мм обсадных труб с начальной овальностью 1 % при интенсивности искривления (2÷3) градуса на 10 м, величина наружного критического давления уменьшается на (5÷10) % по сравнению с величиной критического давления прямолинейных труб, а при интенсивности искривления (6+7) градусов на 10 м - на (20÷25) %. Для оценки напряженного состояния обсадных труб и формы их поперечного сечения при изгибе выполнены экспериментальные исследования, которыми подтверждены результаты теоретических исследований влияния изгиба труб на форму их поперечного сечения и необходимость усовершенствования методики расчета обсадных колонн для крепления наклоннонаправленных скважин. Усовершенствована методика расчета обсадных колонн на прочность при креплении наклонно-направленных скважин путем введения в расчетные зависимости величины допустимого наружного давления, коэффициента снижения сопротивляемости смятию. Разработаны рекомендации по повышению надежности работы обсадных колонн для крепления наклонно-направленных скважин, основанные на усовершенствованной методике их расчета в зависимости от интенсивности искривления скважины. Результаты научных исследований используются в учебном процессе кафедрой бурения нефтяных и газовых скважин ИФНТУНГ при изучении курса «Заканчивание скважин».
Thesis is devoted to the enhancement of operation reliability of casings in directional wells by taking into consideration the curve influence on the out-of-roundness of casing pipes and on the magnitude of ambient critical pressure. The factors have been analyzed that influence on the operation reliability of casing strings during the fixing process of directional wells. There have been observed the methods for solution of the above-mentioned problem. The classification of reasons of low quality casing of directional wells has been specified. Theoretical investigations have been conducted to analyze the influence of casing string curve on the out-of-roundness and durability of casing pipes under the influence of ambient excess pressure. To evaluate the stress state of casing pipes and forms of their cross sections at curve, experimental research has been conducted. The latter has confirmed the results of theoretical investigations devoted to the influence of pipes’ curve on form of their cross sections and necessity to specify the calculation methods of casing strings for fixing of directional wells. The methods have been improved for the calculation of casing as to their reliability during lining of directional wells by the introduction of correction coefficient to the value of external critical pressure depending on the intensity of curve, wall thickness, diameter of pipes and group of steel strength. The recommendations have been developed for the enhancement of operation reliability of casing strings to fix directional wells, which are based on the improved methods of their calculation depending on the degree of well crookedness.
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8

Chadzingwa, Karabo. "Historical perspectives and future directions for access to land, water and related ecosystem services in the Lower Sundays River Valley, South Africa: implications for human well being". Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/442.

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The legacy of South Africa’s history has facilitated unequal access to land and water resources. In the Lower Sundays River Valley (LSRV), a predominantly commercial farming area, differential access to land and water has impacted aspects of ecosystem service access and human well‐being for disenfranchised families over time. Despite the social, political and economic reform efforts in the past two decades, severe inertia towards efforts attempting to increase equitable access to land and water has been experienced. As a result, communities have mobilized and claimed their land from the government through the land restitution process. Based on a mixed‐methods approach, this research explores the ways in which access to land and water over time has influenced current levels of human well‐being among disenfranchised families. Provisioning and cultural ecosystem services were identified as key areas of loss as a result of forced evictions from land. Freedom of choice was a central and cross‐cutting theme regarding the ability to change levels of human well‐being. Although the loss of ecosystem services associated with land and water had an impact on households, the ecosystem services which are regarded as fundamental to human well‐being do not seem to have been lost. The study recommends the wide use of freedom of choice as an indicator for well‐being in the LSRV, as well as a consideration of subjective, objective and psychological measures of well‐being with regards to natural resources and ecosystem services access. Key agents in fostering desirable pathways toward equity and sustainability in the LSRV are identified with stakeholders as private businesses; inclusive governance; empowered and skilled individuals, as well as NGOs.
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9

Graham, Garrett. ""Don't Frack with Denton"". Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984171/.

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Don't Frack With Denton chronicles the ground-breaking movement to ban hydraulic fracturing in the city of Denton, Texas by combining observational location shooting with extensive sit-down interviews and carefully negotiated subject-filmmaker relationships to create a safe and comfortable space for thoughtful reflection and criticism of a complex social movement who's activities span several years and many individuals. The result is a long-form documentary that is unapologetically in solidarity with this movement's goals while simultaneously maintaining enough editorial independence and critical distance to allow the activists themselves to honestly evaluate their decision-making, tactics and interpersonal relationships in ways that will provide insight and instruction to similar movements around the country and the world.
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10

Candido, Denis Ricardo. "Relaxação de spin via D\'yakonov-Perel\' em poços quânticos com acoplamento spin-órbita intersub-banda". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-25092013-161711/.

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Em sistemas com acoplamento spin-órbita (SO) é possível manipular eletricamente o spin do elétron via a aplicação de um campo elétrico.1 Isso permite a potencial aplicação do grau de liberdade de spin (Spintronica) no desenvolvimento de novos dispositivos e tecnologias, como por exemplo na tecnologia da informação (computação quântica).2,3 No entanto, sabe-se que a interação SO causa efeitos indesejáveis, como por exemplo a relaxação e o defasamento de spin.4 Dessa maneira, do ponto de vista de aplicações, torna-se desejável maximizar o tempo de vida do spin. Neste trabalho, investigamos a relaxação de spin dos elétrons de condução em poços quânticos com duas sub-bandas5 crescidos ao longo das direções [001] e [110] via o mecanismo de D\'yakonov-Perel\'.6 Combinando teoria de grupos, o método k.p, a aproximação da função envelope e teoria de perturbação de Löwdin obtemos um Hamiltoniano efetivo para os elétrons da banda de condução na presença das interações SO de Rashba e Dresselhaus. Aqui, diferentemente de alguns trabalhos anteriores,7,8 além de incluir o termo cúbico de Dresselhaus, também levamos em conta as contribuições devido à influência da segunda sub-banda de mais baixa energia do poço. A partir deste Hamiltoniano derivamos expressões para os tempos de relaxação do spin e analisamos como estas novas contribuições (termos do acoplamento com a segunda sub-banda) afetam os tempos de vida dos spins. Comparamos os tempos de relaxação para as direções [001] com os calculados para a direção [110]. Nossos resultados mostram que as contribuições devido à segunda sub-banda são desprezíveis para ambas as direções. Mostramos também que o tempo de relaxação para a direção [110] é mais longo que o da [001], resultado consistente com experimentos9,10 e outros trabalhos teóricos anteriores.7
In systems with spin-orbit (SO) coupling, it is possible to electrically manipulate the electron spin via applied gate voltages.1 This allows for the potential use of the spin degree of freedom (Spintronics) in the development of new devices and technologies, for instance information technology (quantum computing).2,3 It is known however, that the SO interaction leads to the undesired effect of causing spin relaxation and spin dephasing.4 Thus from the point of view of applications, it is desirable to maximize the spin lifetimes. Here, we investigate the spin relaxation of the conduction electrons in quantum wells with two sub-bands5 grown along the [001] and [110] directions via the D\'yakonov-Perel\' mechanism.6 By combining group theory, the k.p method, the envelope function approach and the Löwdin perturbation theory, we obtain an effective Hamiltonian for the conduction electrons in the presence of the Rashba and Dresselhaus SO interactions. Differently from some early works,7,8 in addition to the cubic Dresselhaus term, we also account for the contributions arising from the second lowest sub-band of the well. We derive expressions for the spin relaxation times and analyze how the new contributions (second sub-band terms) affect the spin lifetimes. We compare the relaxation times obtained in the [001] direction with those calculated for the [110] direction. Our results show that the contributions from the second sub-band are negligible for both directions. We also find that the relaxation time in the [110] direction is longer than the one in the [001], a result consistent with experiments9,10 and earlier theoretical works.7
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Più fonti

Libri sul tema "Directional well"

1

Horizontal directional drilling: Utility and pipeline applications. New York: McGraw-Hill, 2005.

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2

Short, J. A. Introduction to directional and horizontal drilling. Tulsa, Okla: PennWell Books, 1993.

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3

Ding, Zhu, Economides Michael J e Society of Petroleum Engineers (U.S.), a cura di. Multilateral wells. Richardson, TX: Society of Petroleum Engineers, 2008.

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4

Bedrikovetsky, Pavel. Mathematical theory of oil and gas recovery: With applications to ex-USSR oil and gas fields. Dordrecht: Kluwer Academic, 1993.

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5

White, Mathew A., Gavin R. Slemp e A. Simon Murray, a cura di. Future Directions in Well-Being. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56889-8.

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6

Women at the well: Feminist perspectives on spiritual direction. New York: Paulist Press, 1988.

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7

Looking into the well: Supervision of spiritual directors. Chicago: Loyola University Press, 1995.

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New directions in health psychology. New Delhi: Sage Publications, 2012.

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Strong, Jeremy. Krazy Kow saves the world--well, almost. London: Puffin, 2002.

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Krekotnev, Sergey. State policy in relation to cities and regions with mono-specialization: experience and priorities. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1098273.

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The monograph analyzes the policy in relation to cities and regions with monospecialization as one of the priority directions of state policy. The article considers the specifics of single-industry cities and regions as socio-political phenomena and objects of state regulation. The main principles, directions, mechanisms and tools for the implementation of state policy in relation to single-profile spatial formations are studied. Special attention is paid to the political and comparative analysis of foreign and domestic experience in the formation and implementation of this direction of state policy, as well as to identifying the degree of applicability of its main models in modern conditions. For specialists in the field of political science and related sciences, as well as anyone interested in this issue in its theoretical and applied dimensions.
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Più fonti

Capitoli di libri sul tema "Directional well"

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Inglis, T. A. "Directional Well Planning". In Directional Drilling, 40–62. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-1270-5_4.

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Morrison, Ann, Jack Leegaard, Cristina Manresa-Yee, Walther Jensen e Hendrik Knoche. "Interactive Furniture: Bi-directional Interaction with a Vibrotactile Wearable Vest in an Urban Space". In Recent Advances in Technologies for Inclusive Well-Being, 183–220. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49879-9_10.

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Wang, Dong-yu, e Hong-zhao Liu. "Dynamic Modeling and Analysis of Sucker Rod Pumping System in a Directional Well". In Lecture Notes in Electrical Engineering, 1115–27. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2875-5_90.

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Karev, Vladimir, Yuri Kovalenko e Konstantin Ustinov. "Directional Unloading Method is a New Approach to Enhancing Oil and Gas Well Productivity". In Geomechanics of Oil and Gas Wells, 155–66. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26608-0_10.

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Dubinya, N. V. "Fluid Conductivity of Natural Shear Fractures in Vicinity of a Production Well During Directional Unloading". In Springer Geology, 239–51. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76328-2_25.

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Zhang, He-wen, Hong-lan Zou, An-le He, Chong Liang, Hong-ge Jia, Hong-hua Zhou e Shun-xiang Gong. "The Movement and Force Analysis of Temporary Plugging Ball for Perforated Holes in Directional Well". In Proceedings of the 2021 International Petroleum and Petrochemical Technology Conference, 383–89. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9427-1_37.

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Rogan, J. V., M. L. Gringolts, N. V. Ushakov, Yu P. Yampolskii e E. Sh Finkelshtein. "Directional Synthesis of Membrane Materials by ROMP of Silyl-Substituted Norbornadienes and Norbornenes". In Novel Metathesis Chemistry: Well-Defined Initiator Systems for Specialty Chemical Synthesis, Tailored Polymers and Advanced Material Applications, 341–49. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0066-6_31.

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Inglis, T. A. "Drilling Problems in Directional Wells". In Directional Drilling, 172–95. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-1270-5_10.

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Inglis, T. A. "Highly Deviated and Horizontal Wells". In Directional Drilling, 196–211. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-1270-5_11.

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Diener, Ed. "Conclusion: Future Directions in Measuring Well-Being". In Assessing Well-Being, 267–74. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2354-4_13.

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Atti di convegni sul tema "Directional well"

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Lu, Zongman. "Research on directional vertical well technology". In 3RD INTERNATIONAL CONFERENCE ON MATERIALS SCIENCE, RESOURCE AND ENVIRONMENTAL ENGINEERING (MSREE 2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5075697.

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Rosa, Guilherme S., Jose R. Bergmann e Fernando L. Teixeira. "Pseudoanalytical modeling of electromagnetic well-logging sensors inside directional wells". In 2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2017. http://dx.doi.org/10.23919/ursigass.2017.8105402.

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Scherschel, S. R., e D. G. Graves. "Underbalanced-Directional Drilling with Coiled Tubing - Challenges and Solutions". In International Conference on Horizontal Well Technology. Society of Petroleum Engineers, 1996. http://dx.doi.org/10.2118/37062-ms.

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Sha, Linxiu, e Kun Li. "Virtual Visualization System for Well Trajectory of Immersion Directional Well". In 2020 International Conference on Computer Network, Electronic and Automation (ICCNEA). IEEE, 2020. http://dx.doi.org/10.1109/iccnea50255.2020.00089.

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Alnasser, A., e M. Elasmar. "Rotary steerable directional tool precision in Unconventional Resources". In Second EAGE/SPE Geosteering and Well Placement Workshop. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201803137.

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Viandante, M., M. S. Spotkaeff, S. Jenkins, A. Simms, E. Oldham, S. Silcock, M. Seaton et al. "Application of New Deep Directional Resistivity Tool to Fully Define Reservoir". In Second EAGE Workshop on Geosteering & Well Placement. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20131563.

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Omeragic, Dzevat, Qiming Li, Larry Chou, Libo Yang, Khanh Duong, Jan Wouter Smits, Ting Lau et al. "Deep Directional Electromagnetic Measurements for Optimal Well Placement". In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2005. http://dx.doi.org/10.2118/97045-ms.

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Konstantakopoulos, I. K., e S. K. Stamataki. "Directional Drilling System "ARIADNE" - The Well Path Finder". In Abu Dhabi International Petroleum Exhibition and Conference. Society of Petroleum Engineers, 1998. http://dx.doi.org/10.2118/49492-ms.

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Lewis, Charles, e Shyh‐Yueh Cheng. "Directional trace synthetic seismogram for a deviated well". In SEG Technical Program Expanded Abstracts 1989. Society of Exploration Geophysicists, 1989. http://dx.doi.org/10.1190/1.1889765.

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Henderson, Bruce, Chris Hopwood, Cameron Hamilton e Jim Garies. "Cost Saving Benefits of Using a fully Bi-directional Tractor System". In SPE/CIM International Conference on Horizontal Well Technology. Society of Petroleum Engineers, 2000. http://dx.doi.org/10.2118/65467-ms.

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Rapporti di organizzazioni sul tema "Directional well"

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Hashash, Youssef, Omar Baltaji, Guangchao Xing e Yongxi Liang. Development of Guidelines for Implementation of Horizontal Directional Drilling. Illinois Center for Transportation, settembre 2021. http://dx.doi.org/10.36501/0197-9191/21-027.

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While the fundamentals of horizontal directional drilling (HDD) technology are well known, the implementation of HDD involves utilizing a vast range of equipment and installation procedures. This project developed HDD guidance documents to provide the Illinois Department of Transportation with metrics to evaluate a proposed HDD installation. This report compiled information collected during this project, including a literature review, HDD case histories observation, and an industry survey. Four main guidance documents, including the proposed HDD Guidelines, HDD Guidance Specifications, Permit Submittal Checklist, and Inspector Checklist, are the main products developed from the project.
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Staller, G. E., R. P. Wemple e R. R. Layne. Casing pull tests for directionally drilled environmental wells. Office of Scientific and Technical Information (OSTI), novembre 1994. http://dx.doi.org/10.2172/10123479.

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Arsan, Guler Gurpinar. Laguerre's Function of Direction in a Generalized Weyl Hypersurface. GIQ, 2012. http://dx.doi.org/10.7546/giq-2-2001-93-98.

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Rene, Schubert. Computing the Meridional Overturning Circulation from NEMO Output. GEOMAR, novembre 2021. http://dx.doi.org/10.3289/sw_3_2021.

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With this script, the Meridional Overturning Circulation (MOC) can be computed from NEMO ocean-model output for the whole globe or the Atlantic (AMOC), Indic (IMOC) and Pacific (PMOC) subbasins. The MOC is computable in z- and sigma coordinates. Moreover, for nested configurations, it is possible to combine data from both host and nest grids. Finally, it is possible to take into account of that the ORCA model grid is curvilinear north of 20°N: it is possible to compute the northward velocity component from the velocity field in x- and y- directions and to sum up the meridional flux over latitudional bands instead of in x-direction. When both steps are applied, the resulting MOC shows however strong variability in meridional direction. It needs to be clarified, whether this is realistic or not. The software is provided in the form of the jupyter notebook "MOC.ipynb" which includes more informations on the possibilites of the computations and an extensive appendix section with comparisons to computations with cdftools, as well as with details on the computation of the MOC including nest data and taking the curvilinearity of the grid into account. Necessary python modules are listed at the beginning of the document.
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Dr. Tarasankar DebRoy. Final Report: A Transport Phenomena Based Approach to Probe Evolution of Weld Macro and Microstructures and A Smart Bi-directional Model of Fusion Welding. Office of Scientific and Technical Information (OSTI), dicembre 2009. http://dx.doi.org/10.2172/968964.

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Baader, Franz, e Cesare Tinelli. Combining Equational Theories Sharing Non-Collapse-Free Constructors. Aachen University of Technology, 1999. http://dx.doi.org/10.25368/2022.103.

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In a previous work, we describe a method to combine decision procedures for the word problem for theories sharing constructors. One of the requirements of our combination method is that constructors be collapse-free. This paper removes that requirement by modifying the method so that it applies to non-collapse-free constructors as well. This broadens the scope of our combi- nation results considerably, for example in the direction of equational theories corresponding to modal logics.
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Eise, Jessica, Natalie Lambert, Tiwaladeoluwa Adekunle e Laura Eise. More Inclusive, More Practical: Climate Change Communication Research to Serve the Future. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317278.

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Climate change impacts are being felt around the world, threatening human well-being and global food security. Social scientists in communication and other fields, in tandem with physical scientists, are critical for implementing mitigation and adaptation strategies effectively and equitably. In the face of rapidly evolving circumstances, it is time to take stock of our current climate change communication research and look toward where we need to go. Based on our systematic review of mid- to current climate change research trends in communication as well as climate change response recommendations by the American Meteorological Society, we suggest future directions for research. We urgently recommend communication research that (1) addresses immediate mitigation and adaptation concerns in local communities and (2) is more geographically diverse, particularly focusing on the African continent, the Caribbean, Latin America, the Middle East and certain parts of Asia.
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Park, Cyn-Young, Peter A. Petri e Michael G. Plummer. Economic Implications of the Regional Comprehensive Economic Partnership for Asia and the Pacific. Asian Development Bank, ottobre 2021. http://dx.doi.org/10.22617/wps210371-2.

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The Regional Comprehensive Economic Partnership (RCEP) presents strong potential to mold regional trade and investment patterns well into the future and to influence the direction of global economic cooperation at a challenging time. This paper evaluates the RCEP’s impact on global and regional incomes, trade, economic structure, factor returns, and employment using a computable general equilibrium model. The results suggest that the RCEP agreement could generate sizable global income gains. Together with the Comprehensive and Progressive Agreement on Trans-Pacific Partnership, the RCEP will also strengthen the region’s manufacturing supply chains, raising productivity and increasing wages and employment.
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Saavedra, Lissette M., Antonio A. Morgan-Lopez, Anna C. Yaros, Alex Buben e James V. Trudeau. Provider Resistance to Evidence-Based Practice in Schools: Why It Happens and How to Plan for It in Evaluations. RTI Press, maggio 2019. http://dx.doi.org/10.3768/rtipress.2019.rb.0020.1905.

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Evidence-based practice is often encouraged in most service delivery settings, yet a substantial body of research indicates that service providers often show resistance or limited adherence to such practices. Resistance to the uptake of evidence-based treatments and programs is well-documented in several fields, including nursing, dentistry, counseling, and other mental health services. This research brief discusses the reasons behind provider resistance, with a contextual focus on mental health service provision in school settings. Recommendations are to attend to resistance in the preplanning proposal stage, during early implementation training stages, and in cases in which insufficient adherence or low fidelity related to resistance leads to implementation failure. Directions for future research include not only attending to resistance but also moving toward client-centered approaches grounded in the evidence base.
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Lovyanova, I. V. On Specific Character of Mathematical Education Content Selection at Subject-Specialised School. [б. в.], 2013. http://dx.doi.org/10.31812/0564/2377.

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The article dwells upon the issues of mathematics teaching as a subject training organisational process. Historical principles and tendencies concerning subject-specialised school creation in particular as well as Russian and soviet school practice are analysed in the article. Experience of differentiation process on the high stage of school education in such countries as France, Japan and the USA has been investigated. The main functions of a subject matter mastering conception at high school have been pointed out. Mathematical education is considered to be the principal component of comprehensive education as well as the factor influencing the quality of education at a higher educational establishment on the whole run. The peculiarities of mathematical education content at a subject-specialised school in different directions of mathematical training have been illuminated in the article along with the deep consideration of succession problem of both secondary comprehensive and higher school educational processes correspondingly, which, in their turn, are regarded as the possible ways of education quality improvement in terms of higher educational establishment (HEE). The constructional principles of educational courses in various mathematical subjects are defined in the article.
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