Evaluation Of Water Drive Development Effect And Optimization Of Development Plan In Block S

The research object of this paper is the S block of the Nuraly Oilfield.The reservoir has developed edge and bottom water.The natural energy method is used for development in the early stage,and then it is converted to water flooding in the later stage.Due to the insufficient natural energy of the reservoir,the formation pressure dropped rapidly as the production progressed,and the productivity also decreased.After the conversion to the water injection method,the production was gradually increased.After a period of stable production,due to the well pattern system Imperfection and lack of water injection wells have resulted in a rapid drop in formation pressure and a decline in production capacity.At present,Block S has entered the late stage of exploitation,with a rapid rise in water cut,a faster rate of decline in production,and poor oilfield development effects.In order to improve the development effect of Block S,it is necessary to comprehensively analyze and evaluate the water injection development effect of the oilfield,and adjust the water injection development policy to provide support and basis for the subsequent reasonable development plan design.In response to the above problems,this article first applies the reservoir engineering method to analyze the production performance data of each layer in the S block.The research results show that as of June 2019,the M layer has a recovery rate of 16.0%and a production decline rate of 14.4%.,The degree of waterflooding reserves control is 72.5%,the degree of waterflooding reserves production is 73.7%,the energy retention level is 79.9%,the cumulative water storage rate is 35.9%,the waterflooding index is 1.4m~3/t,the overall development effect is medium,and the demand Strengthen water injection to increase recovery;?layer recovery is 19.9%,production decline rate is 20.7%,waterflooding reserves control level is 68.3%,waterflooding reserves production level is 68.4%,energy retention level is 58.66%,and cumulative storage The water rate is 28.6%,and the water flooding index is0.35m~3/t.The overall development effect is poor.It is necessary to improve the injection-production system and strengthen water injection to supplement the formation energy.Secondly,a three-dimensional fine geological model is established on the basis of geological structural features and data.Then,based on the geological modeling results,the numerical simulation software was used to establish a complete numerical model to complete the historical fitting of the dynamic data of the whole area and a single well.The fitting results reached an excellent level,and the longitudinal and planar characteristics of each layer were analyzed.The remaining oil distribution characteristics and causes.Finally,the water injection development plan of S block was optimized and adjusted and compared,and the optimal scheme suitable for water injection development of each layer of S block was selected.And on this basis,the well pattern system of the entire block and the injection-production system for reservoir development were optimized,including well spacing,formation pressure maintenance level,water injection rate,and oil production rate.Through the research on the development characteristics and laws of Block S,it provides experience and reference for the development of similar sandstone reservoirs.