稠油油藏水气交替诱导泡沫油冷采提高采收率实验  

Enhanced Oil Recovery Experiment of Foam Oil ColdRecovery Induced by Water-Alternating-Gas Injection in Heavy Oil Reservoirs

作　　者：甄贵男 王健[2] 吴宝成 王炜龙 唐杨 路宇豪 Zhen Guinan;Wang Jian;Wu Baocheng;Wang Weilong;Tang Yang;Lu Yuhao(PetroChina Xinjiang Oilfield Company,Changji,Xinjiang 831700,China;National 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,新疆昌吉831700 [2]西南石油大学油气藏地质及开发工程全国重点实验室,四川成都610500

出　　处：《特种油气藏》2024年第1期101-108,共8页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金面上项目“气溶性活性剂辅助稠油冷采的泡沫油组分传质及界面膜研究”(52174035)。

摘　　要：针对普通稠油油藏水驱过程中存在的黏性指进、动用不充分、采出程度低等问题,基于新疆油田吉7油藏开展了水气交替诱导泡沫油冷采技术研究,自行设计泡沫油配样装置,通过Image J软件对泡沫油图像进行表征,对泡沫油的性能、泡径、泡沫数量进行综合分析;设计制作可视化平面模型,开展稠油注气辅助水驱的泡沫油微观驱油机理研究;开展岩心驱替实验,优化水气交替诱导泡沫油冷采的注入参数。研究表明:CO_(2)在低黏原油中形成的泡沫油性能更好,发泡体积为202.1 mL,半衰期为324 s,降黏率为32.35%;泡沫油的发泡体积和半衰期通常与泡径和泡沫油数量呈负相关关系;泡沫油聚并对黏壁残余油有剥离作用,CO_(2)能够有效动用小孔喉原油、油膜和上层原油;在气液比为1∶1、注入压力为30 MPa、驱替速度为0.2 mL/min的条件下,水气交替诱导泡沫油冷采较普通稠油水驱可提高采收率18.90%。研究成果为新疆油田吉7油藏水气交替诱导泡沫油冷采技术提供了理论依据,也为其他油田水驱稠油油藏提高采收率技术提供了参考。Aiming at the problems of viscous indexing,insufficient producing,and low recovery in the process of water flooding in ordinary heavy oil reservoirs,based on Ji 7 Reservoir in Xinjiang Oilfield,the foam oil cold recovery technology was researched induced by water-alternating-gas injection,and the foam oil sample preparation device was designed by itself.The image of foam oil was characterized by Image J software,and the performance,bubble diameter,and foam number of foam oil were comprehensively analyzed;the visual plane model was designed and made to research the microscopic oil displacement mechanism of foam oil during gas injection assisted water flooding in heavy oil reservoir;the core displacement experiment was carried out to optimize the injection parameters of foam oil cold recovery induced by water-alternating-gas.The research shows that the foam oil formed by O_(2)in low-viscosity crude oil has better performance;the foaming volume is 202.1 mL,the half-life is 324 s,and the viscosity reduction rate is 32.35%;the foaming volume and half-life of foam oil are usually negatively correlated with the bubble diameter and the number of foam oil;the foam oil polymerization has a stripping effect on viscous wall residual oil,and O_(2)can effectively produce crude oil,oil film,and upper crude oil in small pore throat;under the condition of the gas-liquid ratio of 1∶1,the injection pressure of 30 MPa,and flooding rate of 0.2 mL/min,the foam oil cold recovery induced by water-alternating-gas could improve recovery by 18.90%compared with the ordinary water flooding in the heavy oil reservoir.The research results provide a theoretical basis for the foam oil cold recovery induced by water-alternating-gas injection in Ji 7 reservoir of Xinjiang Oilfield and also provide a reference for the enhanced oil recovery technology of water flooding heavy oil reservoirs in other oilfields.

关 键 词：普通稠油 泡沫油 泡径计算 微观驱油机理 参数优化 冷采 低碳 吉7油藏 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]