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Well interference evaluation considering complex fracture networks through pressure and rate transient analysis in unconventional reservoirs

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Petroleum Science 2023年第1期20卷 337-349页

作者： Jia-Zheng Qin Qian-Hu Zhong Yong Tang Wei Yu Kamy Sepehrnoori State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500SichuanChina The University of Texas at Austin AustinTX78703USA

Severe well interference through complex fracture networks(CFNs)can be observed among multi-well pads in low permeability *** well interference analysis between multi-fractured horizontal wells(MFHWs)is vitally important for reservoir effective *** interference has been historically investigated by pressure transient analysis,while it has shown that rate transient analysis has great potential in well interference ***,the impact of complex fracture networks(CFNs)on rate transient behavior of parent well and child well in unconventional reservoirs is still not *** further investigate,this paper develops an integrated approach combining pressure and rate transient analysis for well interference diagnosis considering *** perform multi-well simulation considering CFNs,non-intrusive embedded discrete fracture model approach was applied for coupling fracture with reservoir *** impact of CFN including natural fractures and frac-hits on pressure and rate transient behavior in multi-well system was *** a logelog plot,interference flow and compound linear flow are two new flow regimes caused by nearby *** both NFs and frac-hits are present in the reservoir,frac-hits have a greater impact on well#1 which contains frac-hits,and NFs have greater impact on well#3 which does not have *** all well producing circumstances,it might be challenging to see divergence during pseudosteady state flow brought on by frac-hits on the logelog ***,when NFs occur,reservoir depletion becomes noticeable in comparison to frac-hits in pressure *** of this integrated approach demonstrates that it works well to characterize the well interference among different multi-fractured horizontal wells in a well *** reservoir evaluation can be acquired based on the new features observed in the novel model,demonstrating the practicability of the proposed *** findings of this study

关键词： Well interference Numerical rate transient analysis Numerical pressure transient analysis Complex fracture networks embedded discrete fracture model

Optimization of operational strategies for rich gas enhanced oil recovery based on a pilot test in the Bakken tight oil reservoir

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Petroleum Science 2023年第5期20卷 2921-2938页

作者： Xincheng Wan Lu Jin Nicholas A.Azzolina Jin Zhao Xue Yu Steven A.Smith James A.Sorensen Energy&Environmental Research Center University of North Dakota15 North 23rd StreetStop 9018Grand ForksND58202-9018USA

Horizontal well drilling and multistage hydraulic fracturing have been demonstrated as effective approaches for stimulating oil production in the Bakken tight oil ***,after multiple years of production,primary oil recovery in the Bakken is generally less than 10%of the estimated original oil in *** huff‘n’puff(HnP)has been tested in the Bakken Formation as an enhanced oil recovery(EOR)method;however,most field pilot test results showed no significant incremental oil *** of the factors affecting HnP EOR performance is premature gas breakthrough,which is one of the most critical issues observed in the field because of the presence of interwell ***,injected gas rapidly reaches adjacent production wells without contacting reservoir rock and increasing oil *** conformance control is therefore needed to avoid early gas breakthrough and improve EOR *** this study,a rich gas EOR pilot in the Bakken was carefully analyzed to collect the essential reservoir and operational data.A simulation model with 16 wells was then developed to reproduce the production history and predict the EOR performance with and without conformance *** operational strategies,including single-and multiple-well HnP,with different gas injection constraints were *** simulation results of single-well HnP without conformance control showed that a rich gas injection rate of at least 10 MMscfd was needed to yield meaningful incremental oil *** strategy of conformance control via water injection could significantly improve oil production in the HnP well,but injecting an excessive amount of water also leads to water breakthrough and loss of oil production in the offset *** analyzing the production performance of the wells individually,the arrangement of wells was optimized for multiple-well HnP *** multiwell results showed that rich gas EOR could improve oil production up to 7.4%by employing confor

关键词： Rich gas injection Bakken tight oil reservoir EOR strategies Conformance control embedded discrete fracture model

Horizontal Well Interference Performance and Water Injection Huff and Puff Effect on Well Groups with Complex fracture Networks:A Numerical Study

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Computer modeling in Engineering & Sciences 2023年第12期137卷 2285-2309页

作者： Haoyu Fu Hua Liu Xiaohu Hu Lei Wang State Key Laboratory of Shale Oil and Gas EnrichmentMechanisms and Effective Development SINOPECBeijing100101China Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology SINOPECBeijing100083China Key Laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of GeosciencesWuhan430074China

Well interference has become a common phenomenon with the increasing scale of horizontal well *** studies on well interference in horizontal wells do not properly reflect the physical model of the postfracturing well groups and the realistic fracturing process of infill *** the correspondence between well interference causative factors and manifestations is of great significance for infill well deployment and secondary oil *** this work,we develop a numerical model that considers low velocity non-Darcy seepage inshale reservoirs to study the inter-well interferencephenomenon that occurs in theSantanghufield,andconstruct an explicit hydraulic fracture and complex natural fracture network model with an embedded discrete fracture model,focusing on the effect of fracture network morphology on well *** model also considers a multi-segment wellbore model to accommodate the effect of inter-well crossflow on wellbore tubular *** changes in formation pressure and water saturation during fracturing are performed by controlling the injection pressure and water injection *** result shows that the shape of the fracture network generated by the infill well with the old well determines the subsequent fluid and oil-increasing performance of the disturbed *** synergistic production or competitive relationship formed by fractures with different connectivity between the two wells determines the positive and negative effects of the *** paper also investigates the adaptation study of water injection huff and puff schemes for well groups with different connectivity,and demonstrated a potential yield increase of up to 10.85%under adaptation *** method of identifying well interference based on the production dynamics of affected wells and the subsequent corresponding water injection method provides valuable references for the selection of secondary oil recovery measures.

关键词： Unconventional reservoirs well interference embedded discrete fracture model water injection huff and puff complex fracture networks

Ensemble-based optimization of hydraulically fractured horizontal well placement in shale gas reservoir through Hough transform parameterization

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Petroleum Science 2021年第3期18卷 839-851页

作者： Liang Xue Shao-Hua Gu Xie-Er Jiang Yue-Tian Liu Chen Yang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China Department of Oil-Gas Field Development Engineering College of Petroleum EngineeringChina University of Petroleum(Beijing)Beijing 102249China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efective Development Beijing 100083China Sinopec Petroleum Exploration and Production Research Institute Beijing 100083China School of Water Conservancy North China University of Water Resources and Electric PowerZhengzhou 450046HenanChina

Shale gas reservoirs have been successfully developed due to the advancement of the horizontal well drilling and multistage hydraulic fracturing ***,the optimization design of the horizontal well drilling,hydraulic fracturing,and operational schedule is a challenging *** ensemble-based optimization method(EnOpt)is proposed here to optimize the design of the hydraulically fractured horizontal well in the shale gas *** objective is to maximize the net present value(NPV)which requires a simulation model to predict the cumulative shale gas *** accurately describe the geometry of the hydraulic fractures,the embedded discrete fracture modeling method(EDFM)is used to construct the shale gas simulation *** efects of gas absorption,Knudsen difusion,natural and hydraulic fractures,and gas-water two phase fow are considered in the shale gas production *** improve the parameter continuity and Gaussianity required by the EnOpt method,the Hough transformation parameterization is used to characterize the horizontal *** results show that the proposed method can efectively optimize the design parameters of the hydraulically fractured horizontal well,and the NPV can be improved greatly after optimization so that the design parameters can approach to their optimal values.

关键词： Shale gas Ensemble optimization embedded discrete fracture model Hough transformation