南海东部海相砂岩油田采油速度对采收率的影响研究  

Study of Influence of Oil Recovery Rate on Oi Recovery in Marine Sandstone Oilfields of Eastern South China Sea

作　　者：罗启源 黄余金 羊新州 江健超 Luo Qiyuan;Huang Yujin;Yang Xinzhou;Jiang Jianchao(Shenzhen Branch of CNOOC Limited,Shengzhen Guangdong 518054)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518054

出　　处：《中外能源》2022年第6期41-45,共5页Sino-Global Energy

摘　　要：南海东部海相砂岩油田构造相对小且简单,储层分布稳定、连通性好,储层物性好,原油性质好、产能高,天然水体能量充足。本文统计分析了南海东部海相砂岩油田采油速度与采收率的关系,发现油田采收率不随采油速度的高低而发生单调变化,与储层物性、原油黏度、孔喉特征、构造特征和水体能量密切相关。研究表明较高的采油速度在一定程度上可以增大水驱油效率和波及范围,从而提高采收率,并从理论上分析了采油速度对水驱油效率和水驱波及系数的影响;利用油藏数值模拟软件Eclipse建立了理想模型,研究了不同采液强度对波及效率的影响,认为随着采液强度增大,体积波及系数逐渐增大,当采液强度达到某个值后,体积波及系数趋于定值,表明水驱油藏存在合理的采油速度。本文的研究成果对油田合理提液量和提液时机及油田采油速度优化具有指导意义。The marine sandstone oilfields in the eastern South China Sea have the characteristics of relatively small and simple structure,stable distribution,good connectivity,good physical properties,good crude oil properties,high productivity and sufficient natural water energy in the oil reservoirs.This paper analyzes the relationship between oil recovery rate and oil recovery of marine sandstone oilfields in the eastern South Chi-na Sea.It is found that oil recovery does not change monotonously with oil recovery rate,and is closely related to reservoir physical properties,oil viscosity,pore throat characteristics,structural characteristics and water energy.The results show that the higher oil recovery rate can increase the water displacement efficiency and sweep area to a certain extent,so as to improve oil recovery.The influence of oil recovery rate on water displacement efficiency and sweep coefficient is analyzed theoretically.An ideal model is established by using the reservoir numerical simulation software Eclipse,and the influence of different fluid production intensity on sweep efficiency is studied.It is believed that the volume sweep coefficient increases gradually with the in-crease of fluid production intensity,and tends to a constant value when the fluid production intensity reaches a certain value,indicating that there is a reasonable oil recovery rate for water flooding reservoirs.The re-search results in this paper have guiding significance for the determination of reasonable fluid production in-crease at certain time and the optimization of oil recovery rate.

关 键 词：海相砂岩 采油速度 波及效率 驱油效率 采收率 

分 类 号：TE53[石油与天然气工程—油气田开发工程]