带油环凝析气藏衰竭式开发中——后期提高采收率  

Enhanced Recovery in Middle and Late Stages of Depletion Development of Condensate Gas Reservoirs With Oil Ring

作　　者：黄召庭[1,2,3] 李春涛 汪斌[1,2,3] 乔霞[1,2,3] 付莹 闫炳旭[1,2,3] HUANG Zhaoting;LI Chuntao;WANG Bin;QIAO Xia;FU Ying;YAN Bingxu(Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China;R&D Center for Ultra-Deep Complex Reservior Exploration and Development,CNPC,Korla,Xinjiang,841000,China;Xinjiang Engineering Research Center for Ultra-deep Complex Reservoir Exploration and Development,Korla,Xinjiang 841000,China;Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China)

机构地区：[1]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 [2]中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心,新疆库尔勒841000 [3]新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心,新疆库尔勒841000 [4]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《新疆石油地质》2024年第4期470-474,共5页Xinjiang Petroleum Geology

基　　金：中国石油科技项目(2023ZZ04)。

摘　　要：针对塔里木盆地Y5凝析气藏衰竭式开发过程中地层压力和气井产能快速降低、生产气油比逐渐下降、凝析油密度和黏度逐渐升高、开发效果迅速变差等问题,将生产动态特征与地层流体组分评价相结合,重新认识该气藏为带油环层状边水凝析气藏,并采用数值模拟方法确定其油环厚度。为改善开发效果,提高凝析油气采收率,系统开展带油环凝析气藏衰竭式开发中—后期提高采收率机理研究可知:完善井网、实施循环注气开发能大幅提高油气采收率,注入介质以二氧化碳最佳,气藏自产气次之;注气方式以重力辅助气驱模式最佳。基于气藏类型和提高采收率机理研究,编制了该气藏循环注气提高采收率方案,预测原油采收率较衰竭式开发提高29.96%。该气藏循环注气开发后累计注气0.19×10^(8) m^(3),地层压力恢复4.31 MPa,气井产能恢复到方案实施前的3.09倍,可为其他同类型气藏开发中—后期提高采收率提供借鉴。The depletion development of Y5 condensate gas reservoir in the Tarim basin encounters the challenges such as rapid decline in both reservoir pressure and well productivity,gradual decrease in produced gas-oil ratio,increase in condensate oil density and viscosity,and fast downgrading of development performance.Combining performance analysis and reservoir fluid component evaluation,the Y5 condensate gas reservoir was redefined as a layered condensate gas reservoir with oil ring and edge water and the thickness of the oil ring was determined through numerical simulation.To improve the development performance and enhance the condensate oil/gas recovery,a systematic investigation was conducted on the mechanism of enhanced recovery in the middle and late stages of depletion development of the condensate gas reservoir with oil ring.It is found that optimizing the well pattern and implementing cyclic gas injection can significantly improve oil and gas recovery.Gravity-assisted gas drive is recommended,with CO2 being the optimal injection medium,followed by reservoir gas.Based on reservoir type and enhanced recovery mechanism,a scheme of cyclic gas injection for enhancing the recovery of Y5 condensate gas reservoir was developed,with an expected oil recovery 29.96%higher than that of depletion development alone.Under this scheme,a cumulative gas volume of 0.19×10^(8)m^(3)was injected,the reservoir pressure restored by 4.31 MPa,and the well productivity increased by 3.09 times compared to that before the scheme was implemented.The research results provide valuable reference for enhancing recovery in the middle and late development stages of similar reservoirs.

关 键 词：塔里木盆地 凝析气藏 油环 开发中—后期 循环注气 提高采收率 开发机理 重力辅助气驱 

分 类 号：TE357[石油与天然气工程—油气田开发工程]