Analysis On Water Injection Development Effect Of Chang 4+5 Reservoir In A17 Block

A17 block with ground elevation of 1400-1800 meters and relative height difference of 50-100 metersis a part ofHujianshan Oil field geographically,which is located in Dingbian County,Shaanxi Province.After several years of exploitation,A17 block is mainly characterized by the following production characteristics: high injection and production ratio,pressure lever of about 80%,decreasedliquid production.In addition,water cut rapidly increase,especially water cut in the source direction goes up fastest,flooded area is large.production decreases rapidly.Therefore,in view of the above problems,oilfield production dynamic data and water injection development status are studiedto find out the causes of these problems and come up with the corresponding improvement measures,which have great practical significance to reduce the cost of crude oil recovery and to improve the final recovery and the comprehensive development of oil field.Logging data,core data,oil test data and test data and so forth are analyzed to make a little bit new understanding and evaluation of the reservoir geological characteristics of chang4+5(tectonic geology,sedimentary facies,reservoir characteristics).Also,the reservoir seepage law experiment is conducted to further understand the influential factors of reservoir sensitivity.Based on the above analyses,the way of water injection and well pattern adaptability evaluation,capacity analysis,production decline analysis,water flooding status,water utilization analysis,water flooding recovery are studied to determine water injection effect factors.By optimizing injection production parameters,timely adjusting the injection production well network,and taking intermittent injection,the experimental and field test for reasonable intermittent cycle and injection production parameters.The problems such as high injection production ratio,rapid increase in water cut and fast production decline are effectively solved.Eventually,the cost of crude oil production is reduced,the ultimate recovery of oil and the comprehensive development benefit of oil field are improved.