Оценка индивидуальных эксплуатационных параметров совместно вскрытых низкодебитных пластов по комплексу геофизических исследованийКременецкий М.И., Панарина Е.П., Кокурина В.В., Мельников С.И./ ООО "ГАЗПРОМНЕФТЬ НТЦ" Авторское право 2014 г., Общество инженеров нефтегазовой промышленности Этот доклад был подготовлен для презентации на Российской технической нефтегазовой конференции и выставке SPE по разведке и добыче, 14 -16 октября, 2014, Москва, Россия.Данный доклад был выбран для проведения презентации Программным комитетом SPE по результатам экспертизы информации, содержащейся в представленном авторами реферате. Экспертиза содержания доклада Обществом инженеров нефтегазовой промышленности не выполнялась, и внесение исправлений и изменений является обязанностью авторов. Материал в том виде, в котором он представлен, не обязательно отражает точку зрения SPE, его должностных лиц или участников. Электронное копирование, распространение или хранение любой части данного доклада без предварительного письменного согласия SPE запрещается. Разрешение на воспроизведение в печатном виде распространяется только на реферат объемом не более 300 слов; при этом копировать иллюстрации не разрешается. Реферат должен содержать явно выраженную ссылку на авторское право SPE.

Paper presents production logging (PL) problems in tight comingled reservoirs. Quantitative evaluation is possible when PL is done with JET pump or ESP & T-tool or naturally flowing wells.Authors have made series of numerical simulations to determine temperature distribution in producers and optimize production logging and interpretation procedure.Simulation illustrates traditional temperature interpretation technique with comparing well temperature logging curve with geothermal gradient is useless in case of tight reservoirs due to high influence of previous production and unstable flow. New way can handle that problem.New way of temperature interpretation to individual evaluation of tight comingled reservoirs can be used even in difficult for traditional temperature logging cases: horizontal wells, inflow control valves (ICV) presence in the wellbore, etc.Author's method is based on mathematical simulation and on production logging case studies. In high rate producers temperature logging were compared with spinner and results were the same.Technology implementation on comingled wells of Western Siberia oil fields gives each formation rate and pressure. That results in production and injection optimization to increase sweep efficiency and recovery.

A waterflood study has been performed on a heterogeneous oil deposit with a rising water-cut and production decline after 10 years of commercial production. The objective was to analyze the efficiency of waterflood patterns across the field and suggest injection optimization opportunities. The production is facilitated by ESP with Permanent Downhole Gauges (PDGs) which provides an opportunity to analyze the productivity index and cross-well interference. The PDG analyzes was performed in PolyGon pressure modelling facility and followed Multi-well Retrospective Testing (MRT) workflow which is based on the mathematical procedure of multiwell deconvolution (MDCV). MDCV trains the correlation between bottom-hole pressure (BHP) variations from PDG data records and rates variations from daily production history of a given well and other wells around it. This provides a robust short-term predictor for production response for different rate/BHP scenarios and makes a basis for injection optimization opportunities. MDCV allows reconstructing formation pressure and productivity index back in time, pick up the changes and understand if they were caused locally (by skin) or massively (by transmissibility). The diffusion modelling of deconvolved data allows a robust quantification of some reservoir properties in cross-well intervals, such as the current drained volume around each well, potential drained volume (as if the offset wells are shut-down), apparent cross-well transmissibility, boundary types and compare them against the various geological scenarios and possible well-reservoir contact scenarios. The quantitative analysis allows picking up anomalously high cross-well interference which may be caused by thin-bedding circuiting or induced fracture. It also provides a strong hint for thief-injection and thief-production in cases of poor cross-well interference.

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A difficult condition of field development requires the search for new methods and techniques for more comercial production. There is active development and introduction of new technologies in the field of geophysical monitoring technologies in recent years. When the well inflow is a multi-phase one, or is low and unstable, the flow metering data tends to be of no particular value for evaluation of pay potential of a formation. Thus, some alternative evaluation methods become increasingly required. According to field data analysis, temperature log appears to be the most efficient geophysical survey in a setting discussed. The report looks into capabilities of temperature log and the scope of its applicability to quantitative evaluation of production from formations that are only able to provide some low and unstable multi-phase inflow. The report describes the method of evaluating well production outside inflow intervals in case of a cycling operating pattern or when the well operating mode is changed, and thus geothermal temperature distribution can not be used as background data. Examples include well test results obtained on fields of different types (terrigenous, carbonate) with different saturation of reservoirs when they were opened by a vertical well and by a horizontal well.