碳酸盐岩油藏不同裂缝产状岩心水驱油实验及水驱规律  

Water flooding experiment and law of carbonate reservoir cores with different fracture occurrences

作　　者：郭红鑫 程林松 王鹏[1,2] 贾品[1,2] GUO Hongxin;CHENG Linsong;WANG Peng;JIA Pin(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing City,102249,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing City,102249,China)

机构地区：[1]油气资源与探测国家重点实验室中国石油大学(北京),北京102249 [2]中国石油大学(北京)石油工程学院,北京102249

出　　处：《油气地质与采收率》2022年第6期105-112,共8页Petroleum Geology and Recovery Efficiency

基　　金：中国石油重点科技项目“弱挥发性碳酸盐岩油藏水驱规律研究”(RIPED.CN-2020-JS-50373)。

摘　　要：碳酸盐岩油藏多发育裂缝,不同裂缝产状对水驱特征和水驱油规律的影响有待研究。通过岩心驱替实验,利用5种裂缝产状碳酸盐岩岩心,探究了不同裂缝产状下水驱油规律。研究结果表明:水平贯穿缝岩心呈现同步动用阶段、近缝基质动用阶段和裂缝窜流阶段-三段式动用规律;无水期和高含水期是岩心主要的驱油阶段;贯穿缝岩心见水时间早,无水驱油效率和最终驱油效率较低。随着裂缝倾角减小,油(水)相对渗透率下降(上升)加快,残余油饱和度变大,水相相对渗透率增大,两相区逐渐变窄。基于Hagen-Poiseuille方程提出了带缝岩心中仅考虑裂缝的渗透率计算方法,利用三方面实验手段解决了束缚水饱和度统一的难题,并给出了实际矿场的提液时机,为碳酸盐岩油藏开发提供了理论指导。Carbonate reservoirs mostly develop fractures.The influence of different fracture occurrences on the characteris⁃tics and law of water flooding needs to be studied.Through the core displacement experiment,the water flooding law with different fracture occurrences was explored by using carbonate cores with five types of fracture occurrences.The results show that the core with horizontal through fractures has a three-stage production law,namely,synchronous production stage,near-fracture matrix production stage,and fracture channeling production stage.The water-free period and the high water-cut period are the main oil displacement stages of the core.The core with the through fractures has an early water breakthrough,but its anhydrous oil displacement efficiency and final oil displacement efficiency are low.As the fracture an⁃gles decrease,the relative permeability of oil(water)decreases(increases)rapidly.The residual oil saturation and the water phase relative permeability increase,and the two-phase area gradually narrows.Based on the Hagen-Poiseuille equation,the permeability calculation method that only considers fractures in the fractured core was proposed.The problem that the irreducible water saturation is hard to be unified was solved through experiments involving three aspects,and the liquid pro⁃duction increase time of actual fields was given,which provides theoretical guidance for the development of carbonate reser⁃voirs.

关 键 词：裂缝产状 碳酸盐岩 岩心驱替实验 水驱油 水驱规律 

分 类 号：TE344[石油与天然气工程—油气田开发工程]