低渗透油藏二氧化碳气溶性泡沫控制气窜实验研究  

Gas-Channeling Control Experiment with Carbon Dioxide Gas-Soluble Foam in Low-Permeability Oil Reservoir

作　　者：李宛珊 王健[1,2] 任振宇 木合塔尔 Li Wanshan;Wang Jian;Ren Zhenyu;Mu Hetaer(Southwest Petroleum University,Chengdu,Sichuan 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University),Chengdu,Sichuan 610500,China;PetroChina Jilin Oilfield Company,Songyuan,Jilin 138000,China;PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China)

机构地区：[1]西南石油大学,四川成都610500 [2]油气藏及地质开发工程国家重点实验室,四川成都610500 [3]中国石油吉林油田分公司,吉林松原138000 [4]中国石油新疆油田分公司,新疆克拉玛依834000

出　　处：《特种油气藏》2019年第5期136-141,共6页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“CO2驱油与埋存开发调控技术研究”(2016ZX05016-001-003);国家自然科学基金面上项目“重力超覆下气体连续‘剥蚀’稠油边界层的驱油机制研究”(51574200)

摘　　要：吉林油田黑79区块CO2驱气窜严重,水基泡沫的井筒CO2腐蚀问题日益明显。为此,探讨了CO2气溶性泡沫新技术,结合该区块油藏条件,对5种气溶性起泡剂的溶解性能及起泡性能进行了评价,并开展了气溶性泡沫的岩心流动实验,评价了泡沫的封堵效果、吸水剖面改善效果及提高采收率情况。研究表明:起泡剂1529溶液在超临界CO2中的气溶性最好,随着醇类助溶剂的加入,其最高溶解量可达1.36%,起泡体积为657.8mL,半衰期为47min;在气液比为2∶1、注入速度为0.01mL/min、注入6周期条件下,阻力因子最高可达37.92,吸水剖面改善率为69.89%,与水驱相比可提高采收率39.045个百分点。CO2气溶性泡沫新技术可封堵气窜通道,避免井筒腐蚀,提高低渗透油藏泡沫剂的注入性。研究成果对于改善黑79区块CO2驱开发效果和大幅度提高采收率具有重要意义。The development of Block Hei79 in Jilin Oilfield is characterized by serious gas channeling in CO2 flooding and gradually serious CO2 wellbore corrosion for water-based foam.In order to explore the new technology of CO2 gas-soluble foam,and the solubility and foaming performances of 5 gas-soluble agents were evaluated by combining with the block geology.Laboratory core flow experiment with gas-soluble foam was carried out to evaluate the performances of foam plugging,water profile-control and enhancing oil recovery.Research indicates that the foaming agent 1529 solution shows the best gas solubility in the supercritical CO2.The maximum dissolution volume can reach 1.36% with the addition of alcohol cosolvent,the foaming volume is 657.8 mL and the half-life is 47 min.When the gas-liquid ratio is 2:1,the injection rate is 0.01 mL/min and the injection period is 6 cycles,the resistance factor is up to 37.92.The corresponding water injection profile-control is improved by 69.89% and the oil recover factor is enhanced by 39.045 percentage points than that of waterflooding.This new CO2 gas-soluble foam technology can plug the gas channeling and prevent wellbore corrosion and improve the foam injection performance in low-permeability oil reservoir.This research is of great significance for improving the CO2 flooding performance and enhancing oil recovery in the Block Hei79.

关 键 词：低渗透 CO2泡沫 气溶性 溶解性 起泡性能 封堵性能 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]