Study On Remaining Oil Distribution And Development Plan In Region Li 71-74

Complicated fault-block oil reservoirs play considerably important role in oil and gas production.Now the complicated fault-block oil reservoirs,which have been put into the develop,their geological reserves and the production of one year are about one-third of the national accounts.Compared with conventional oil reservoirs,complicated fault-block oil reservoirs,which are difficult to exploit,have following geological and development properties: smaller oil areas,more oil and water interfaces.Therefore,it is more significant for improving the level of development of complicated fault-block oil reservoirs by researching the law of remaining oil distribution and analyzing influences various factors exert on exploration of oil reservoirs according to its special geological and production characteristics.In this paper.Based on geological characteristics of complicated fault-block oil reservoirs,3D precise reservoir geological modeling of the region Li71-74 complicated fault-block oil reservoirs in the Lijin oil field was set up by applying modern reservoir description and stochastic modeling technique;In addition,by using modern reservoirs engineering methods,we perform dynamic analysis;Further more,based on the history match,by using reservoir numerical simulation technology,the remaining oil distribution and its law were studied accurately and selected six key potential development area;Lastly,by using reservoirs engineering methods and considering the economic indicators,we concluded some development technology policies,it includeing the reasonable well spacing density,the reasonable well pattern,and the reasonable well space.Finally,the development plan for the region Li 71-74 in Lijin oilfields was optimized and the development index was predicted.The results of the study show that the reasonable well spacing density is 10.2 wells in each square kilometrer.,and the region is suitable for triangle irregular injection-production well pattern,reasonable well space is about 300~350m;the best plan include 21 producing wells and 17 injection wells,the best injection-production ratio is 0.85,the best liquid production rate is 70m3/d,forecast of production twenty years,and the final recovery is about 46.5%,increased by 19.2%.The results of the study could bring convenience to researchers on complicated fault-block oil reservoirs development.