致密砂岩油藏CO_(2)灌注提高混相程度研究  

CO_(2)perfusion to improve degree of miscibility in tight sandstone reservoir

作　　者：陈龙龙 汤瑞佳 江绍静 王维波 白远 魏登峰 张志升[2] 王仙仙 CHEN Longlong;TANG Ruijia;JIANG Shaojing;WANG Weibo;BAI Yuan;WEI Dengfeng;ZHANG Zhisheng;WANG Xianxian(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an,Shaanxi,China;Xingzichuan Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Yan'an,Shaanxi,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院 [2]延长油田股份有限公司杏子川采油厂

出　　处：《石油与天然气化工》2024年第4期79-84,共6页Chemical engineering of oil & gas

基　　金：陕西省秦创原“科学家+工程师”项目“碳中和背景下油藏CO_(2)地质封存关键技术”(2022KXJ-050);陕西省重点研发计划“低渗透油藏气驱分级封窜体系研发与性能评价”(2023-YBGY-311);陕西延长石油(集团)有限责任公司“揭榜挂帅”项目“杏子川油田低压油藏提高CO_(2)驱混相程度关键技术攻关”(ycsy2021jbgs-A-04-01)。

摘　　要：目的基于快速补充地层能量可实现提高CO_(2)混相程度的技术原理,对灌注法提高鄂尔多斯盆地低压致密砂岩油藏CO_(2)非混相驱混相程度的可行性进行研究。方法采用室内实验方法,在油藏条件下比较不同注入流量、注入量的CO_(2)驱油效果,考查了地层压力、换油率、采出程度、气油比及抽提参数的变化。结果与常规注入流量和注入量相比,灌注后地层压力增加4.14 MPa,换油率增加0.13,采出程度提高22%,气油比降低50%,C_(4)~C_(12)的组分含量明显增加,重组分的含量明显减少。2个井组现场试验表明,相比灌注前,井组月产油增加78%,平均地层压力5 MPa,对应油井的油压提升了4.5 MPa,混相程度提高了32.81%,驱油效果显著。结论灌注法可有效提高CO_(2)驱混相程度,能够改善致密砂岩油藏储层CO_(2)非混相驱油效果。Objective Based on the technical principle that rapid replenishment of formation energy can improve the degree of CO_(2)miscibility,the feasibility of the injection method to improve the degree of CO_(2)immiscible flooding in low-pressure tight sandstone reservoirs in Ordos Basin was studied.Methods In this paper,the effects of CO_(2)displacement at various injection rates and volumes were compared under reservoir conditions.The changes of formation pressure,oil change rate,recovery degree,gas-oil ratio and extraction parameters also were investigated.Results Compared with the conventional injection rate and volumes,the formation pressure increased by 4.14 MPa,the oil change rate increased by 0.13,the recovery degree increased by 22%,the gas-oil ratio decreased by 50%,the component content of C_(4)—C_(12) increased significantly,and the content of recombination component decreased significantly.Field tests of the two well groups showed that the monthly oil production of the well group was increased by 78%,the average formation pressure was 5 MPa,the corresponding well oil pressure was increased by 4.5 MPa,the degree of miscibility was increased by 32.81%,and the oil displacement effect was remarkable.Conclusion The injection method can effectively improve the degree of CO_(2)miscible flooding and the effect of CO_(2)immiscible flooding in tight sandstone reservoirs.

关 键 词：致密砂岩油藏 CO_(2)非混相驱 CO_(2)灌注 混相程度 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]