异步注采补充能量方法提高油水同层产油量  

Energy supplementation method by asynchronous injection and production to enhance oil production from oil-water co-layers

作　　者：寸少妮 夏晨丹 杨兴利[1] 涂彬[2] 李相方[2] CUN Shaoni;XIA Chendan;YANG Xingli;TU Bin;LI Xiangfang(Exploration and Development Research Center,Yanchang Oilfield Co.,Ltd.,Yan'an 716099,Shaanxi,China;School of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]延长油田股份有限公司勘探开发技术研究中心,陕西延安716099 [2]中国石油大学(北京)石油工程学院,北京102249

出　　处：《石油钻采工艺》2024年第3期298-308,共11页Oil Drilling & Production Technology

摘　　要：油水同层油藏注水开发中后期水窜现象加剧,开发效果显著变差,亟需改进注水方式。分析了原始储层在含束缚水饱和度以及含不同可动水饱和度时注水驱替油水两相微观渗流机理,对含可动水岩心进行了水驱实验,并进行了油水同层油藏注水开发数值模拟。研究表明:相较于仅含束缚水油藏,油水同层油藏在注水开发中后期因储层内原始可动水能够传递压力,致使含水率明显增加,说明采用传统注水方式与注水参数存在显著局限性;若对含可动水油藏采用连续注水方式,会加速生产井水窜速度,原因是注水前沿抵达生产井后毛管力逐步降低、水相渗透率持续增加;采用异步周期注水可以实现高强度注水,快速补充地层能量,使产液量与产油量提升2倍。因此,异步注采方式能够解决油水同层油藏因可动水导致的水驱效果欠佳问题。In the middle and later development stages of water flooding in oil-water co-layer reservoirs,water channeling intensifies,and the development performance deteriorates significantly.Therefore,there is an urgent need to improve water injection methods to enhance reservoir energy.The microscopic oil-water two-phase flow mechanisms in reservoirs with original bound water saturation and varying movable water saturation were analyzed.Furthermore,water flooding experiments on core samples with movable water saturation,as well as numerical simulations of water flooding development in oil-water co-layer reservoirs were conducted.The research suggests that,compared to reservoirs containing only bound water saturation,oil-water co-layer reservoirs experience a significantly faster increase in water cut during the middle and later stages of development due to the pressure transfer capability caused by the original movable water,and the conventional water injection methods and parameters exhibit obvious limitations.Continuous water injection accelerates the rate of water channeling in production wells,primarily because capillary forces gradually weaken after the injection front reaches the production well,causing water phase permeability to increase progressively.Asynchronous cyclic water injection can achieve ultra-high-intensity water injection,and rapidly replenish reservoir energy,enabling a twofold increase in fluid production and oil production.Therefore,asynchronous injection-production methods can address the issue of poor water flooding performance caused by movable water in oil-water co-layer reservoirs.

关 键 词：非常规能源 低渗透致密油藏 可动水饱和度 不稳定注水 油水同层 异步注采 补充能量 

分 类 号：TE357[石油与天然气工程—油气田开发工程]