Study On The Remaining Oil Distribution And Potential Exploitation Measures In Thick And Bottom-Water Reservoir Of L2

Bottom water reservoirs account for a large proportion in China's reservoirs,and their reserves are quite abundant.In addition to a large number of natural bottom water reservoirs,as the oilfield enters the secondary exploitation,more oilfields are developing towards bottom water-driven reservoirs.Therefore,to clarify the genetic types and distribution patterns of remaining oil in such reservoirs can effectively guide the comprehensive adjustment of oilfields in the later stage of development and tap the potential of remaining oil,and improve the ultimate recovery factor.On the basis of referring to the development technology research and application achievements of bottom water reservoir at home and abroad,taking L2 thick layer bottom water reservoir as the research object,this paper establishes a three-dimensional geological model of the reservoir,carries out numerical simulation combined with injection-production dynamic characteristics and monitoring data,evaluates water drive effect,analyses oil-water movement characteristics and evaluates reserves production status,and evaluates L2 thick layer bottom water oil production status according to simulation results.Reservoirs carry out research on the distribution law of remaining oil,and recognize the distribution form and potential of remaining oil.On this basis,the corresponding potential tapping measures are put forward to improve crude oil production.The results show that the remaining oil in the L2 reservoir is mainly distributed in the upper rhythm section.Based on the distribution of remaining oil,four potential tapping measures such as well pattern adjustment,artificial baffle,polymer flooding and foam flooding are proposed.By studying the development effect of each technology on L2 reservoir,these four schemes can effectively improve the reservoir productivity.Among them,artificial barrier technology increases oil production by 8.74×10~4 t,and the recovery degree of upper rhythm section increases by 8.87%.The development effect is the best.