塔中Ⅰ号缝洞型凝析气藏注水提高凝析油采收率研究  

A Feasibility Study on Enhancing Condensate Oil Recovery of Fractured-Vuggy Condensate Gas Reservoir in Tazhong-1 Gas Field,Tarim Basin

作　　者：康博[1] 张烈辉[1] 王健[1] 邓兴梁[2] 郭平[1] 刘志良[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《新疆石油地质》2015年第5期575-578,共4页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(51374181);国家科技重大专项(2008ZX050054)

摘　　要：塔中I号气田主要为缝洞型碳酸盐岩凝析气藏。试采证实衰竭式开发凝析油采收率为25%左右。由于较强的储集层非均质性导致井间连通性差,传统注气保压现场应用难度大。通过对比分析缝洞型凝析气藏与砂岩凝析气藏的反凝析机理,结合室内实验和现场试验研究,论证此类凝析气藏采用先衰竭后注水开采方式的可行性。结果表明,缝洞型凝析气藏储集空间及流动通道主要是大缝大洞,由于重力分异致使反凝析液聚集于缝洞单元底部,注水可把洞内反凝析形成的凝析油驱替出来,大幅提高凝析油采收率。此开采方式单井注水驱替油工艺简单易行、经济有效。Tazhong-1 gas field is a condensate gas reservoir with fractured-vuggy carbonate rocks. Production test indicated that the de-plete development process just obtained the condensate oil recovery of about 25%. As a result of poor interwell connectivity,conventionalgas injection to maintain pressure process was difficult to use. This paper makes a comparison of retrograde condensation mechanism offractured-vuggy carbonate condensate gas reservoir with that of sandstone condensate gas reservoir. On the basis of laboratory and field testresearches,it demonstrates the feasibility of deplete followed by water injection process applied to the fractured-vuggy carbonate conden-sate gas reservoir. The result shows that the storage space and flow path in such a condensate gas reservoir are mainly fractures and cavi-ties,and gravitational differentiation allows the retrograded liquid to concentrate at the bottom of fracture-vug unit,so single well water in-jection approach can be used to displace the condensate oil formed by retrograde condensation in these fractures and cavities,and to great-ly enhance the condensate oil recovery with simplicity and effectivity.

关 键 词：塔里木盆地 缝洞型凝析气藏 注水开发 凝析油 提高采收率 

分 类 号：TE372[石油与天然气工程—油气田开发工程]