摘要
吐哈温吉桑油田储集层以正韵律或复合正韵律沉积为主,断层、裂缝不发育。油层少,砂体连通性好。同时,吐哈油区有丰富的天然气资源,这些特征非常适合注气驱,为此开展了注气非混相驱方案研究。通过对注气区块优选,注气影响因素分析,注气工程参数优化设计,完成温吉桑油田注天然气水气交替非混相驱方案,形成一套低渗透油田有效实用的水气交替非混相驱注气方案设计方法。方案采用顶部注气,边部注水,水气交替非混相驱方式。水气比为1押1,交替周期半年,累计注入气段塞为0.25倍孔隙体积,提高采收率6%～7%.
Wenjisang reservoir in Tu-Ha field is dominated by positive rhythm or complex positive rhythm with undeveloped faults and fractures as well as few payzone but good sands connectivity. And abundant natural gas resource found in Tu-Ha field could be yielded by gas injection immiscible displacement. By selecting the gas injection blocks, analyzing the factors of affecting gas injection and planning the optimized parameters for gas injection, the project by water-gas alternating immiscible displacement has been accomplished, forming such an effective and practicable process of top gas injection and edge water injection for low permeability oilfield, with water-gas ratio of 1:1, alternating cycle of half a year, cumulative gas-injected plug of 0.25HCPV. The oil recovery in this reservoir could be increased up to 6%～7%.
出处
《新疆石油地质》
CAS
CSCD
2004年第6期656-658,661,共4页
Xinjiang Petroleum Geology
