缝洞型碳酸盐岩油藏单井注气影响因素模拟分析  

Simulation analysis of influencing factors of single well gas injection in fracture-vuggy carbonate reservoir

作　　者：袁飞宇 王鸿鹏 乐平[1] 张淑慧 范庆振 曾博鸿 YUAN Feiyu;WANG Hongpeng;YUE Ping;ZHANG Shuhui;FAN Qingzhen;ZENG Bohong(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Sinopec Northwest Oilfield Company,Urumchi 830011,China)

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]中石化西北油田分公司,乌鲁木齐830011

出　　处：《非常规油气》2023年第4期86-94,共9页Unconventional Oil & Gas

基　　金：“十三五”国家科技重大专项“缝洞型油藏流体识别及剩余油分布物理模拟研究”(2016ZX05053-002)。

摘　　要：塔河油田是典型的缝洞型碳酸盐岩油藏。针对塔河油田油井随着注气规模与注气轮次的增加,注气效果差异大以及注气效果主控因素不明等问题,以塔河油田的一口典型单井TH12261为研究对象,运用地质建模与数值模拟软件,结合地质资料与生产特征,建立了单井注气机理模型,综合讨论了缝洞型碳酸盐岩油藏单井注气影响因素。结果表明:1)TH12261井每轮次注气开井后产油量增加,含水降低,油井注氮气有效。2)裂缝-溶洞型高渗透碳酸盐岩储层存在大量“阁楼油”,而氮气非混相驱替的主要机制是重力分异调整油水界面和地层能量补充,有利于驱替“阁楼油”。3)断裂距离对注气效果影响最大,影响幅度占41.16%;断裂渗透率影响次之,影响幅度占35.67%;水体大小影响幅度占18.75%;储集体大小的影响因素相对较弱,仅占4.42%。该研究成果对如何优化注气参数,进一步提高该类油藏采收率有一定参考意义。Tahe Oilfield is a typical fracture-vuggy carbonate reservoir.Aiming at the problems of large difference in gas injection effect and unclear main control factors of gas injection effect with the increase of gas injection scale and gas injection rounds in Tahe Oilfield,takes a typical single well TH12261 in Tahe Oilfield as the research object,uses geological modeling and numerical simulation software,combined with geological data and production characteristics,establishes a single well gas injection mechanism model,comprehensively discusses the influencing factors of single well gas injection in fracture-vuggy carbonate reservoir.The results show that:1)After each round of gas injection in well TH12261,oil production increased and water cut decreased,and N 2 injection was effective.2)There is a large amount of“attic oil”in fracture cave high permeability carbonate reservoir.The main mechanism of N 2 immiscible displacement is gravity differentiation,adjusting oil-water interface and stratum energy supplement,which is conducive to the displacement of“attic oil”.3)The fracture distance has the greatest influence on the gas injection effect,accounting for 41.16%;the fracture permeability was followed by 35.67%;the influence range of water size accounted for 18.75%;the influence factor of storage size is relatively weak,accounting for only 4.42%.The research results have certain reference significance for how to optimize the gas injection parameters to further improve the recovery of this type of reservoir.

关 键 词：注气 塔河油田 缝洞型 碳酸盐岩油藏 主控因素 

分 类 号：TE319[石油与天然气工程—油气田开发工程]