海上油田二元驱后调整模式制定及提采增效优选

Formulation of adjustment mode and optimization of enhanced recovery for offshore oilfield after SP flooding

针对海上油田二元驱后存在的剩余油零散、存聚量大、环境污染严重等问题,本文应用数值模拟方法,深入研究二元驱后油藏开发面临的3大矛盾,将油藏划分为3种驱替效果,提出了二元驱替效果优于水驱部位(开发效果差异大、小)和水驱驱替效果优于二元部位的"调+驱+洗"组合模式,同时开展了"调+驱+洗"高效驱油体系筛选和二元驱后提采增效方案优选。研究结果表明,与高浓度聚合物-二元驱和非均相驱相比,高浓度聚合物驱具有提高采收率幅度较大、吨聚增油量大的优点,与目前方案和综合调整方案相比,采收率分别提高8.36、5.12个百分点,为海上油田二元驱后开发模式制定及调整提供科学依据。

In view of the problems of scattered remaining oil,large polymer accumulation and serious environmental pollution after SP flooding in offshore oil fields,this paper uses numerical simulation method to deeply study the three major contradictions faced by reservoir development after SP flooding,and divides the reservoir into three kinds of displacement effect.The combination mode of"control+flooding+displacement"is put forward,in which the displacement effect of SP flooding is better than that of water flooding(the difference of development effect is big and small)and that of water flooding is better than that of SP flooding.At the same time,the selection of"control+flooding+displacement"high-efficiency displacement system and the optimization of recovery efficiency scheme after binary flooding are carried out.The results show that compared with high concentration polymer SP flooding and non-homogeneous flooding,high concentration polymer flooding has the advantages of larger EOR recovery and large oil production per ton of polymer.Compared with the current scheme and comprehensive adjustment scheme,the recovery is increased by 8.36 and 5.12 percent respectively,which provides a scientific basis for the formulation and adjustment of post SP flooding development mode in offshore oilfield.