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5th EAGE St.Petersburg International Conference and Exhibition on Geosciences - Making the Most of the Earths Resources
- Conference date: 02 Apr 2012 - 05 Apr 2012
- Location: Saint Petersburg, Russia
- ISBN: 978-90-73834-23-1
- Published: 02 April 2012
81 - 100 of 178 results
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Determination of Geological Heterogeneities Producing Formations on the Basis of Spatial-temporal Interpolation
By I.I. EfremovIdentified shortcomings of digital 3D geological models of oil and gas in its adaptation to the development history. Shown that the results of a study of deviations of actual rates of development for the project data often have very valuable information, particularly about the structure of the fractured reservoirs, the presence of channel filtering on areas previously undetected areas of destruction. The presented method based on the process of spatial-temporal interpolation of data obtained from the monthly performance report. Using techniques to determine the geological previously unidentified heterogeneity, hydrodynamically correctly adapt the original model to the geological features of the real field.
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Simulation of Fault-related Small Scale Convection
By D.D. DoganIt is well known that temperature distributions of geothermal areas are strongly affected by the local fluid circulations. Particularly, fault zones with high permeabilities can trigger fluid circulation depending on their permeability contrast on the surrounding medium and on their spatial extension. In this study, evolution of time-dependent, fault related hydrothermal circulation and resulted temperature distribution were investigated. Various fault geometries and depth extensions were used to simulate the small scale convection pattern related to the fractures. In the models, dramatic increase in heat flux was observed with the increasing number of fault zones.
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The Issues of Resources Provision and Methods of Solving this Question of the Layer O4, Tolkaevsko-Sorochinsk Dome, Sorochinsko-Nikolskoe Field, Orenburg Region
Authors N.N. Myakinina and E.S. LopatinaСуществует проблема несоответствия ресурсной базы месторождений и данных по добыче нефти, связанная с возможным недоучетом начальных геологических запасов. Одним из них является Сорочинско-Никольское месторождение. Уникальным объектом здесь представляется пласт О4, который содержит карбонатные коллекторы. Так на Толкаевско-Сорочинском куполе на 2010 год по этому пласту обеспеченность запасами углеводородов составляла 1 год, при достаточно высокой и стабильной среднегодовой добыче и низкой обводненности продукции. Рассмотрение корреляции пластов, анализ обоснования принятых ВНК, определение условий формирования, характеристики коллекторов на основе диагенеза карбонатной толщи окского надгоризонта, переинтерпретация данных сейсморазведки 3Д, атрибутный анализ, уточнение петрофизических параметров привело к построению новой геологической модели. В результате на примере группы пластов О4, О4а/, О4а и О4б окского надгоризонта Толкаевско-Сорочинского и Бородиновского куполов Сорочинско-Никольского месторождения выделен единый работающий резервуар, произведено укрупнение геологических объектов и, как результат, установлена причина несоответствия извлекаемых запасов и добычи углеводородов и предложен метод решения
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Application of a Digital Workflow to Integrate Geosteering and Field Development Planning
Authors A. Kharitonov, J. Pitcher, E. Bikchandaev, A.A. Alabushuin and Y.V. YuvzhikOne of the challenges of modern oilfield development is integrating data acquired while drilling horizontal development wells into a geological framework. As part of an ongoing development program in the Kyrtael field, Komi Republic, a new integrated geosteering platform was introduced to assist in well placement and field development. The platform linked a structural model of the field to a real-time geosteering application, to allow rapid transfer of interpreted data between the real time well construction environment and the geological interpretive environment An example of the value of such a platform was demonstrated on a recent well. A previously unknown geological discontinuity was encountered in a well that was being actively geosteered. Although several geological interpretations of the discontinuity exist, the size and position are mapped in the existing wellbore and when transferred to the interpretive environment, consideration of that feature can be made during the planning process for two further upcoming wells. Understanding that the feature exists and its potential impact on upcoming wells adds significant value to the understanding and process of developing well plans. By integrating all of the data in a common environment enables rapid appraisal of new data and its impact on future development plan.
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Reservoir Permeability and Horizontal Well Drainage Volume Identification on the Initial Stage of Field Development
By A. SemenovИспользование горизонтальных скважин стало стандартной практикой при разработке ряда месторождений. Ряд математических моделей, предложенных Joshi S.D. (1991) и Butler R.M. (1994), используется для математического описания работы горизонтального ствола. В настоящее время под математическим моделированием понимают чаще всего моделирование резервуара и скважины в гидродинамическом симуляторе. Однако данное описание системы скважина-пласт с одной стороны является слишком простым для описания реальной природы в силу дискретности и ряда модельных предположений, с другой стороны – слишком сложным для принятия ряда повседневных решений инженера по разработке резервуара. Целью данной работы являлась разработка и применение на практике аналитических инструментов для математического моделирования горизонтальной скважины. Приток к горизонтальной скважине отличается от притока к вертикальной скважине не стационарностью, необходимостью обладания более полной информации о коллекторе при прогнозировании. Не стационарность можно представить как зависимость коэффициента продуктивности скважины от времени (материальный баланс для замкнутой зоны дренирования). Как показал Semenov A.A. (2010, 2011), формализованное сравнение модельных кривых зависимости продуктивности от времени с данными реальных замеров со скважин позволяют определить зону дренирования горизонтальной скважины и получить уточненное распределение ФЕС (фильтрационно-емкостные свойства) пласта. Что дает возможность оценить дренируемые запасы залежи, и оптимизировать плотность сетки скважин в зонах с наилучшими свойствами. Решение данных задач показано на примере залежи пластов Як3-7 Ванкорского месторождения.
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An Experimental Study of Aphron Based Drilling Fluids
Authors S. Gokavarapu, S. Gantla, J. Patel, D. Shah and N. NatrejaIn order to drill depleted reservoir, high permeability formations, and other under pressure zones we require drilling fluids which are having density lesser than that of water. Thus, various methods have been developed by injecting air or inert gases in the drilling fluids in order to reduce the equivalent density of the drilling fluids. In order to solve the problem Aphron based drilling fluids are used for drilling to eliminate the problem associated with the above mentioned reservoirs. A laboratory study was initiated to determine the physical and rheological properties of Aphron based drilling fluids for successful completion of wells and its cost depends to a considerable extent on the properties of the drilling fluids. There is no need of injecting air or gases because Aphrons are produced easily at the surface with mixing equipment. This paper gives the detail description of composition and properties of oil based and water based Aphron drilling fluid systems. At last, the potential application of Aphron Based Drilling Fluid Technology in Indian Scenario has been highlighted
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Improved Oil Recovery of High-viscosity Oil Pools by Combined Steam Injection and Physicochemical Stimulation
Authors L.K. Altunina, V.A. Kuvshinov, S.O. Ursegov and M.V. ChertenkovPresented are the results of laboratory research and field tests of physicochemical technologies intended to improve oil recovery of high-viscosity oil pools developed by steam injection (SI). To increase SI efficiency we proposed to combine it with physicochemical methods using gel-forming systems to increase reservoir coverage and oil-displacing systems to provide additional oil displacement. Two IOR technologies have been developed with thermotropic gel-forming polymer and inorganic systems, which under surface conditions are low-viscosity aqueous solutions, whereas under reservoir conditions they are converted into gels. Gelation time ranges from some minutes to several days at 30-320оС. In 2002-2006 pilot tests were carried out in Russia and China. Since 2007 technologies are commercially used, 124 wells were treated, additional oil production amounted to 340 thou tons. We developed technology alternating SI and physicochemical stimulation with oil-displacing systems based on surfactants, generating СО2 and alkaline buffer solution in situ. Pilot tests were carried out in Russia and China. At steam flooding water cut decreased by 10-20%, oil production rate increased by 40%. At cyclic steam stimulation oil production increased 1.8-2.3 times and prolonged for 3-5 months, oil viscosity decreased 3 times. The systems are commercially produced in Russia and China.
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Field Development and EOR
More LessToday, one of the most effective methods to increase oil recovery and stabilization and reduction water cut in the wells is a measure for the construction of lateral wellbores. The purpose of the course work is to analyze the operation of wells and sidetracks to prove the effectiveness of this technology in the oil and gas fields.
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Reflection of No Equilibrium Two Phase Processes of Filtration in Heterogeneous Media in the Active Seism Acoustic Borehole Monitoring Data
Authors O.A. Hachay, V.V. Dryagin, G.V. Igolkina and O.Y. KhachayПроизводится сопоставление неравновесных эффектов при независимом гидродинамическом и сейсмоакустическом воздействии на нефтяной пласт. Известно, что при дренаже и пропитке проявляется эффект гистерезиса на кривых относительной фазовой проницаемости в зависимости от водонасыщенности пористой среды при нескольких циклах воздействия: дренаж-пропитка-дренаж. В предыдущих работах произведен анализ данных сейсмоакустического мониторинга в режимах фонового излучения, отклика на первое воздействие заданной частоты и на второе воздействие. Для анализа сейсмоакустического отклика во времени на фиксированных интервалах по скважине предложен алгоритм построения фазовых диаграмм состояния многофазной среды. В настоящей работе на основе имеющегося алгоритма добавлен алгоритм анализа изменения пространственного, но интегрального по времени за одинаковые периоды наблюдения методом фазовых диаграмм состояния многофазной среды в пределах нефтяного пласта.
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First Deep Horisontal Boreholes Drilling and Pumping for Oil Extraction at the Urubcheno-Tohomskoe Oil-gas Condensate
Authors A.G. Vakhromeev, R.U. Siraev, V.M. Ivanishin and R.K. AkchurinProblems of deep pumping oil horizontal borehole drilling and postcompletional flow testing in basal carbonate crevice oil complex at the biggest in eastern siberia urubcheno-tohomskoe oil-gas-condensate pool are discussion. Key words: horizontal borehole drilling, geology and technology conditions, oil reservoir (deposit)
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A New Chemical Additive for Preventing Shale and Marl Layers from Swelling During Well Operation
More LessThe collapse of shale and marl layers is a significant challenge in drilling oil and gas wells.The suitable fluid must have tailor-made rheological properties to assist it in dissolving and dispersing clay minerals especially Illite, Montmorilonite, Chlorite, and Kaolinite. Production of this kind of fluid demands in depth geological and drilling studies on shaly-marly formations. Various drilling fluid chemical additives including glycol, which is customarily used in South oil regions of Iran, were investigated and drilling problems in marl and shale layers are discussed. In the following sections an account of seven wells from the Marun field encountering stuck pipe is given. Details of these cases such as depth of stuck pipe, pipe releasing approach and new types of utilized fluids are also presented. Experiments were conducted with a tablet-making metal apparatus to study the effectiveness of proposed substances on dispersion of shale and marl formations and overcoming the stuck pipe problem in the Petroleum laboratory.
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Estimation of Gas Hydrate Saturation from Sonic Log Data in the Krishna Godavari Basin, India
Authors D. Bhowmick, D.K. Gupta, U. Shankar and K. SainThis paper is based on the determination of gas hydrate and free saturations in the Krishna Godavari Basin of India using two different rock physics modelling approaches. The rock physics models are used to generate the initial models for the inversion procedure and the sonic log data is provided as its input. We have also introduced a new and fast hybrid inversion technique formed from the combination of sequential inversion and Multivariate Newton Raphson method. The results obtained from both the models are compared. It is found that both the models show variations in results. The three phase weighted method estimates about 10-12% gas hydrate and 0.5-0.7% free gas in the region. On the other hand, the saturations of gas hydrate and free gas obtained from effective medium model are found to be 16-20% and 1.0-1.2% respectively. The results obtained from the later model are found to be in good agreement with the previous results.
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Estimation of Gas Hydrate Saturation Using Rock Physics Modelling - A Case Study in the Krishna-Godavari Region
Authors D. Bhowmick, D.K. Gupta and U. ShankarThe NGHP Expedition 01 confirmed the presence of gas hydrate in the Krishna Godavari basin region. We have used the LWD sonic log of the NGHP-01-05 site obtained during this expedition and determined the hydrate reservoir properties using two different rock physics modelling approaches. We applied the ant colony global optimization technique to invert the acoustic properties into reservoir properties. The initial models used during the inversion were generated using rock physics equations. The region lying above the BSR was subjected to determination of gas hydrate saturation while the one below BSR was analyzed for free gas. The saturations of hydrate and free gas and also the porosity of the sediments were mapped for the NHGP-01-05 well. It was found that the sediments at the site are saturated with about 12-20% gas hydrate and 0.5-1.5% free gas.
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Kinematic and Dynamic Characteristics of Seismic Pulses in Porous-fractured Rocks with Effective Spatial Wave Dispersion
Authors S.M. Glubokovskikh and V.E. RokThis work concerns with seismic pulses propagation in porous-fractured rocks. Such geological media could possess strong macroscopic spatial dispersion of seismic waves. Results of physical modelling are compared with theoretical estimations of group velocities based on linear slip model of fluid-saturated fracture. They are in good agreement. Computer 3D full waveform simulation of compressional pulses reflection on the boundary of isotropic and transverse isotropic media with horizontal symmetry axis provide a validation that use of group velocities instead of phase ones raises accuracy of the Rueger's approximate equations when concerning utilized in practice seismic signals.
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Rock Physics Modelling for Successful Well-log Interpretation
Authors L.A. Uspenskaya, D.V. Emelyanov, A.P. Kulik, D.A. Garenskih and A.A. BelomestnykhEvaluation of influence of fluid saturation and lithological composition on elastic properties becomes one of the most relevant objective today. For a solution of such problems using a petroelastic model based on the effective media theory. The practical realization was carried out for East Uvat oilfield (West Siberia region). The area was divided in north and south parts characterized by different lithologic composition. The south part are characterized by limestone and sandstone with a small volume of shale, in contrast in south part the north part are characterized by polymict sandstone, siltstones and shales. The primary parameter adjustment for creating of petroelastic model was attended using wells with complete logs data. Further adjustment parameters implements using serial iteration of interpretative parameters that influence on elastic properties. A more iterations was necessary for wells without measured density and bad quality log data. Thus, petroelastic modeling solves the problems related not only with influence fluid saturation and lithologic composition on elastic properties of rocks, but also log data interpretation is more accurate with petroelastic modeling than without it. Our goal, in preparing this article, is to help illustrate the powerful role that rockphysics can play in well log interpretation.
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GIS-based Analysis for Petroleum Exploration - Case Study of Northern South America
Authors L. Bingham, A. Escalona and R. Zurita-MillaThe petroleum industry uses geographic information systems (GIS) for mapping and database needs as GIS elucidates spatial relationships between geologic and geophysical data. Generally, however, the petroleum industry does not exploit the full potential of GIS for analysis in exploration activities. Multi-criteria evaluation (MCE) combines data showing areas best fulfilling specific criteria. There are many different MCE methodologies, all of which are subjective. Petroleum exploration requires a method which is spatial, flexible for combining data, considers the data’s interpretive nature, is geologically applicable, and is applicable for frontier areas or where there is little information regarding probabilities of petroleum. This study created an MCE method for petroleum exploration based on fuzzy logic which fulfills the requirements above using 16 subcriteria and 1 constraint combined in tiers to produce a favorability map of potential exploration. A case study shows new exploration areas in the Cretaceous, Paleogene, and Miocene. By comparing known producing fields to the favorability outputs of one non-geologic-age-specific and three geologic-age-specific favorability maps in the case study, the method is validated. It is concluded that the method can be applied in an exploration setting and is applicable for other regions of the world.
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Prospects of Application of Geographic Information Technologies in Exploration for Oil and Gas
Authors M.A. Spikin, V.A. Pozdnyakov and S.S. HudyakovThe paper describes the experience in application of geographic information technologies and satellite imagery of high spatial resolution for solving practical problems in finding hydrocarbon deposits. It gives an example of a geographic information system based on WEB-technologies for making design decisions and monitoring exploration works in the Krasnoyarsk Krai.
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A Ghost-free Solution for Marine Seismic Acquisition
Authors Y. Ampilov, E. Fromyr and S.J. PharezThe ghost in marine seismic recording is the result of a reflection of the acoustic wavefield from the sea surface. Up-going waves are reflected back with reversed polarity, interfering constructively for certain frequencies and destructively for other frequencies dependent solely on source and receiver depths. Conventional marine seismic acquisition therefore involves a trade-off between the various frequency ranges. Recently a dual-sensor streamer, with collocated pressure and motion sensors, has been developed which removes the receiver ghost while maintaining the efficiency of towed streamer acquisition. A ghost-free source can be achieved with a time and depth distributed source using sub-sources deployed at specific depths and fired with specific firing time delays. The depths of the sub-sources are chosen such that the ghost functions are complementary, avoiding deep notches in the spectrum. Techniques for separating the wavefields from sub-sources have been developed that utilize the known firing time delays. The subsequent source ghost removal step involves re-combining those wavefields using well established techniques. De-ghosting or wavefield separation for source and receiver is based on first principle science and makes no restricting assumptions. The resultant seismic data has broader bandwidth both at the high end and the low end of the frequency spectrum.
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About Seismoprospecting Works on Water Area of the Nizhnekamsk Water Basin
Authors I.L. Dagaev, V.V. Chernyev and E.M. IgnatovaWork carried out now on generalization of all geologo-geophysical data will allow to specify potential resources of region.
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Comparison of Cable and Cableless Seismic Systems on Land and Marine
Authors Y.V. Roslov, V.A. Telbukhov, I.N. Kadurin and E.G. ZhemchuzhnikovNowadays cableless seismic is widely developed for land and marine applications. Comparing cable and cableless systems two key parameters have to be considered: data quality and operation cost. The data quality/operation cost ratio should be maximized in modern seismic. How to compare this ratio for cable and cableless systems? GeoEnergyGroup and SeismoShelf decided to joint efforts in order to carry out two filed experiments: land and marine for both systems simultaneously. SeismoShelf contributed with 4C seismic nodes and GeoEnergyGroup organized two test sites with on-going industrial acquisitions with cable systems. Finally two seismic surveys: onshore and offshore have been performed. Field data acquired with cable and nodal systems are demonstrated and discussed.
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