Research Of Flow Field Regulation And Recovery Enhancement Scheme Optimization In A Reservoir

In recent years,with the outbreak of the epidemic and the impact of the RussiaUkraine conflict,coupled with China’s increasing foreign dependence,the contradiction between China’s demand for crude oil and the capacity of domestic and foreign oil field development and international crude oil prices has become increasingly prominent.Therefore,reasonable,perfect,efficient and economic oilfield development planning is especially important.Currently,water-driven oil fields account for more than 80% of reserves and production in China,and with long-term water injection and development,more and more oil fields are entering into high water-bearing period,and A reservoir is no exception.Due to the non-homogeneity of the reservoir,the long-term water injection will produce uneven replacement,resulting in non-homogeneity of flow field distribution.In order to achieve balanced replacement to improve the field development effect,it is necessary to tap the remaining oil based on fine remaining oil description,establish quantitative characterization methods for long-term water-driven high water-bearing reservoirs,reservoir zoning measures and regulation countermeasures,and form a new flow field order through formation reorganization,oil stabilization and water control,and inter-well connectivity analysis.Based on the analysis of geological characteristics and field statistics of reservoir A,this paper evaluates the field profile,development history,current development status,development characteristics and development potential of reservoir A.It clarifies the reservoir property time variation law after long-term water-driven flushing,establishes a mathematical model to characterize the reservoir property time variation by water injection flushing multiplier,compiles and verifies the numerical simulation to reflect the characteristics of long-term water-driven high water-bearing reservoir.The original data model was modified and re-fitted with fine history by applying the self-developed software to reservoir A.The results show that after considering the reservoir physical time-variation,the numerical simulation history fitting effect is significantly improved and the remaining oil distribution pattern is more accurate.In this paper,we combined the results of static and dynamic parameters of the reservoir to establish the zoning boundaries of the remaining oil recoverable reserves abundance and the zoning boundaries of the seepage velocity,and then determined the parameters separately to finally divide the flow field of reservoir A into five zones and establish the technical countermeasures for the regulation of each zone;based on the actual situation of the reservoir,reservoir A was reorganized into three sets of formations,namely Ming San,Ming Si and Guan Tao,for development;based on the development dynamics of the wells and the reservoir development Based on the development dynamics of oil wells and reservoir development,191 oil wells(including the transfer injection)in reservoir A were analyzed in terms of production capacity and water content: in terms of production capacity,the wells were divided into four types of typical production wells;in terms of water content change pattern,the wells were divided into four types of typical wells with water content characteristics,and control measures were proposed based on the influencing factors of each partition;based on the system analysis method,the production dynamic data and geostatistical data were used to invert the dynamic The system analysis method is used to invert the dynamic relationship between reservoir wells using production dynamic data and geostatistics.In this paper,based on the research results of fine description of remaining oil and technical countermeasures of flow field regulation,three recovery enhancement schemes are designed for the actual situation of reservoir A.Based on the numerical simulation model of the reservoir,a multi-input and multi-output control model is established with the current oil and water well working system as the input,the future oil and water well working system as the output,and the net present value as the objective function,and the production dynamics are optimized in real time.Considering the economic factors,the NPV is used as the evaluation criterion of the scheme,and the results show that Scheme2,which performs dynamic real-time optimization of oil and water wells,is optimal.In this paper,the reservoir engineering theory,seepage mechanics theory,numerical simulation method and mathematical analysis method are applied to conduct an in-depth study on the flow field regulation of reservoirs with characteristics of long-term water drive and high water-bearing period,and the corresponding development adjustment strategy is proposed to realize the optimization of flow field regulation and provide technical support for the efficient development of similar oil fields.