特高含水期微观剩余油动用对策研究  

Countermeasures of Producing for Microcosmic Residual Oil in Ultra-high Water Cut Stage

作　　者：张莉 聂俊[1,2] 于洪敏 Zhang Lii;Nie Jun;Yu Hongmin(R&D Center of Sustainable Development of Continental Sandstone Mature Oilfield,Beijing 100083;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083)

机构地区：[1]国家能源陆相砂岩老油田持续开采研发中心,北京100083 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《中外能源》2021年第11期44-48,共5页Sino-Global Energy

基　　金：国家自然科学基金项目“难采稠油多元热复合高效开发机理与关键技术基础研究”(编号:U20B6003)部分研究成果。

摘　　要：本文以单孔型剩余油滴为研究对象,采用压强分析法研究了特高含水期微观剩余油的受力状态和受力影响因素,并结合数值模拟方法,分析了特高含水期剩余油的动用条件和动用对策。研究结果表明,特高含水期微观剩余油的驱替动力主要受驱替压力梯度、油滴与驱替方向夹角的影响,随驱替压力梯度增加,油滴与驱替方向的夹角减小,驱替动力增加,可动用更小孔隙半径中的油滴。油滴与驱替方向的夹角小于40°,驱替压力梯度每增加1倍,驱替动力增加1.5~2倍;将水平方向驱替改变为平行油滴方向驱替,驱替动力可增加到1.2~2倍。驱替阻力主要受界面张力、孔隙半径的影响,界面张力每降低一个数量级,驱替阻力减小1/10。改变驱油体系性能,可大大缩短高耗水的开发过程,增加驱替流度比、降低界面张力可将驱替倍数降低到水驱的0.31~0.16倍。Single-hole residual oil droplets are studied in this paper.Its force and influencing factors of the microcosmic residual oil in the ultra-high water cut stage were analyzed by pressure analysis method.Com-bined with the numerical simulation method,the producing conditions and countermeasures of the residual oil in the ultra-high water cut stage were studied.The results show that the displacement dynamics are mainly influenced by displacement pressure gradient and the angle between oil droplets and displacement direction.With the increase of displacement pressure gradient,the angle is smaller and the displacement dynamics increase to produce oil droplets in smaller pores.If the angle is less than 40 °,when the displacement pressure gradient doubles,the displacement dynamics increases by 1.5-2 times.If the displacement in horizontal direc-tion is changed to that is parallel to the oil droplets,the displacement dynamics could be increased to1.2-2.0 times.The displacement resistance is mainly influenced by interfacial tension and pore radius.As the inter-facial tension decreases by an order of magnitude,the displacement resistance reduces by 1/10.Changing the performance of the displacement system could greatly shorten the development process of high water consump-tion,and increasing the displacement mobility ratio or reducing the interfacial tension may reduce the dis-placement multiple to 0.31-0.16 times of that in water flooding.

关 键 词：特高含水期 剩余油滴 受力分析 动用条件 驱油效率 

分 类 号：TE327[石油与天然气工程—油气田开发工程]