基于微流控模型的裂缝性储集层渗吸机理实验  

Experimental research on imbibition mechanisms of fractured reservoirs by microfluidic chips

作　　者：于馥玮 高振东[2] 朱文浩 王川[3] 刘凡 徐飞 姜汉桥 李俊键 YU Fuwei;GAO Zhendong;ZHU Wenhao;WANG Chuan;LIU Fan;XU Fei;JIANG Hanqiao;LI Junjian(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Yanchang Oilfield Corporation,Yan’an 716000,China;Sinopec International Petroleum Exploration&Production Corporation,Beijing 100083,China;State Key Laboratory of Offshore Oil Exploitation,Beijing 100028,China;CNOOC Research Institute Ltd.,Beijing 100028,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]延长油田股份有限公司,陕西延安716000 [3]中国石化国际石油勘探开发有限公司,北京100083 [4]海洋石油高效开发国家重点实验室,北京100028 [5]中海油研究总院有限责任公司,北京100028

出　　处：《石油勘探与开发》2021年第5期1004-1013,共10页Petroleum Exploration and Development

基　　金：国家科技重大专项(2017ZX05009-005-003);中国工程院战略咨询项目(2018-XZ-09);中国石油大学(北京)科研基金资助(2462019QNXZ04)。

摘　　要：针对岩心渗吸实验周期长和计量难度大等问题,设计了不同尺寸、不同边界条件的裂缝-基质微流控模型,并通过表面性质修饰对模型润湿性进行调控,开展了油-水、油-润湿改性体系、油-WinsorⅢ型表面活性剂体系的一系列渗吸实验并研究其渗吸机制。研究表明,在油-水、油-润湿改性体系渗吸过程中,油相通过海恩斯阶跃采出,毛细管回压是阻碍基质油相排出的主要阻力,界面张力的降低导致海恩斯阶跃减弱,降低了排油速度,提高了油相采出程度;油-水和油-低界面张力的润湿改性体系渗吸是毛管压力主导的逆向渗吸过程,各个边界对渗吸的贡献程度相近,与经典渗吸标度方程拟合较好;油-WinsorⅢ型表面活性剂体系渗吸是在超低界面张力条件下由重力主导的顺向渗吸过程,实质上是中相微乳液的形成与再平衡过程,其在微观模型中的渗吸动态与前人渗吸标度方程的修正模型拟合较好。图26表1参27。To solve the problems of long experiment period and difficult measurement in core imbibition experiments, fracture-matrix microfluidic chips of different sizes, boundary conditions and wettability regulated by surface property modification were designed to research the imbibition mechanisms of oil-water, oil-surfactant solution and oil-Winsor Ⅲ type surfactant solution. In the oil-water, and oil-wettability modification system imbibition process, oil was replaced from the matrix through Haines jump, the capillary back pressure was the main resistance blocking the flow of oil, the reduction of interfacial tension caused the weakening of Haines jump, reduction of oil discharge rate, and increase of oil recovery. The imbibition of oil-water or oil-surfactant solution with low interfacial tension was a countercurrent imbibition process dominated by capillary force, in which all boundaries had similar contribution to imbibition, and the recovery data obtained from this experiment fit well with the classic imbibition scaling equation. The imbibition of oil and Winsor III type surfactant solution was a co-current imbibition process dominated by gravity under super-low interfacial tension, and is essentially the formation and re-balance of neutral microemulsion. The imbibition dynamics obtained from this experiment fit well with the modified imbibition scaling equation.

关 键 词：裂缝性储集层 渗吸机理 微流控模型 中相微乳液 

分 类 号：TE355[石油与天然气工程—油气田开发工程]