砂砾岩油藏原位乳化提高采收率实验研究  

Experimental Study on In-situ Emulsification Enhanced Oil Recovery of Glutenite Oil Reservoir

作　　者：罗强[1,2] 李明[1,2] 李凯[2,3] 宁朦[2,3] 贺伟 杜代军 Luo Qiang;Li Ming;Li Kai;Ning Meng;He Wei;Du Daijun(PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;Joint Laboratory of Recovery Enhancement Engineering of Southwest Petroleum University,Karamay,Xinjiang 834000,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油新疆油田分公司,新疆克拉玛依834000 [2]西南石油大学提高采收率工程联合实验室,新疆克拉玛依834000 [3]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《特种油气藏》2023年第1期100-106,共7页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金“黏度可控的原位增黏体系构建及高效驱油机理研究”(U19B2010)。

摘　　要：针对砂砾岩油藏非均质性强的特点,提出了一种原位乳化提高采收率技术,对新型W/O型乳化体系(DMS)开展了乳化性能、降低界面张力性能以及驱油性能研究,同时与油田现场用聚合物-表面活性剂二元体系进行了对比。实验结果表明:不同含水率下DMS能够与原油发生乳化形成W/O型乳液,随着含水率的增大,乳液黏度增高,在含水率为70%时黏度达到最大值,为原油黏度的9倍,远高于二元体系的黏度,流度控制能力更强;DMS能够定向吸附于油水界面,将油水界面张力降低至0.12 mN/m;受拉伸卡断作用,在DMS的作用下油水发生原位乳化形成W/O型乳液,乳液粒径为0.5~6.0μm;砂砾岩岩心进行DMS驱以及后续水驱能够提高采收率18.6%,当渗透率级差为10时,二元驱及后续水驱能提高采收率24.0%,而DMS驱以及后续水驱能够提高采收率35.3%,表现出更好的流度控制以及吸水剖面改善能力。研究结果为砂砾岩油藏提高采收率提供理论支撑。In view of the strong heterogeneity of the glutenite oil reservoir,an in situ emulsification enhanced oil recovery technology was proposed.The emulsification performance,interfacial tension reduction performance and oil displacement performance of the new W/O emulsification system(DMS)were studied,and at the same time the results were compared with the polymer/surfactant binary system used in the oil field.The experimental result shows that under different water contents,DMS can emulsify with crude oil to form W/O emulsion.With the increase of water content,the viscosity of emulsion increases.When the water content is 70%,the viscosity reaches the maximum value,which is 9 times of the viscosity of crude oil,much higher than the viscosity of binary system,and the fluidity control ability is stronger.DMS can be directionally adsorbed on the oil-water interface and reduce the oil-water interfacial tension to 0.12mN/m.Under the influence of DMS,oil and water are emulsified in situ to form W/O emulsion with a particle size of 0.5-6.0μm.In the glutenite core,DMS flooding and subsequent water flooding can improve the recovery by 18.6%.Under the permeability max-min ratio of 10,dual flooding and subsequent water flooding can improve the recovery by 24.0%,while DMS flooding and subsequent water flooding can improve the recovery by 35.3%,showing better fluidity control and the ability to improve the water absorption profile.The research result will provide theoretical support for enhanced oil recovery of glutenite oil reservoir.

关 键 词：砂砾岩 原位乳化 W/O型乳液 非均质性调控 提高采收率 

分 类 号：TE327[石油与天然气工程—油气田开发工程]