摘要
针对南堡凹陷高5断块V油组常规水力压裂开发效果不佳的问题,通过开展PVT和岩心混相吞吐实验,明确CO_(2)混相压裂吞吐提高采收率作用机理,并利用矿场试验进一步验证技术有效性。研究结果表明:在目前地层压力(33.00 MPa)下,CO_(2)与原油可实现混相,且注入摩尔分数为60%的CO_(2)后原油体积膨胀41.01%,黏度降低33.08%,密度增加7.28%,表明CO_(2)对原油具有较好的增溶、膨胀、降黏作用;CO_(2)混相压裂吞吐采出程度可达到60%以上。试验井CO_(2)混相压裂吞吐后稳定生产26个月,累计增油2200 t,原油重质组分得到了有效动用。该研究为低渗及致密油藏效益开发提供了有效技术途径。
To address the problem of poor development of conventional hydraulic fracturing in V Formation of Fault Block Gao 5,Nanpu Sag,PVT and core miscible huff and puff tests were conducted to clarify the mechanism of enhancing oil recovery by CO_(2) miscible fracturing and huff and puff,and the technical effectiveness was further verified by field tests.The study results showed that:at the current formation pressure(33.00 MPa),CO_(2) and crude oil could be mixed,and the crude oil volume was expanded by 41.01%,the viscosity decreased by 33.08%,and the density increased by 7.28%after the injection of CO_(2) with a mole fraction of 60%,and CO_(2) was effective in solubilization,expansion and viscosity reduction of crude oil;the recovery efficiency could reach more than 60%by miscible fracturing and huff and puff.After CO_(2) miscible fracturing and huff and puff,the production of test wells was stable for 26 months,with a cumulative increase of 2200 t in oil production,and the heavy components of crude oil were effectively utilized.The study provides an effective technical approach for the profitable development of low-permeability tight reservoirs.
作者
吴俊峰
刘宝忠
刘道杰
王长权
李迎辉
刘国华
Wu Junfeng;Liu Baozhong;Liu Daojie;Wang Changquan;Li Yinghui;Liu Guohua(PetroChina Jidong Oilfield Company,Tangshan,Hebei 063004,China;Yangtze University,Wuhan,Hubei 430100,China;CNPC Great Wall Drilling Company,Panjin,Liaoning 124010,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2022年第5期126-131,共6页
Special Oil & Gas Reservoirs
基金
国家科技重大专项“低渗-致密砂岩储层体系表征及评价新方法”(2017ZX05009001-002)
国家自然科学基金“超临界CO 2-原油-地层水三相相平衡溶解度规律”(51404037)。
关键词
低渗透油藏
CO_(2)混相压裂吞吐
提高采收率
最小混相压力
南堡凹陷
low-permeability reservoir
CO_(2) huff and puff in miscible fracturing
enhanced oil recovery
minimum miscible pressure
Nanpu Sag
