CO_2在准噶尔盆地昌吉油田吉7井区稠油中的溶解性研究  

Study on CO_2 solubility in heavy oil in Well Ji7, Changji oilfield, Junggar Basin

作　　者：高敬善[1] 但顺华 杨涛[1] 张小红[1] 岳红星[1] 于岐 Gao Jingshan;Dan Shunhua;Yang Tao;Zhang Xiaohong;Yue Hongxing;Yu Qi(Zhundong Oil Production Plant,PetroChina Xinjiang Oilfield Company;Karamay Huaxin Energy Technology Service Co.Ltd.)

机构地区：[1]中国石油新疆油田公司准东采油厂 [2]克拉玛依华信能源技术服务有限公司

出　　处：《中国石油勘探》2018年第5期65-72,共8页China Petroleum Exploration

基　　金：中国石油天然气股份有限公司重大科技专项"新疆油田浅层稠油稳产提效技术研究与应用"(2017E-0408)

摘　　要：为论证CO_2驱油技术在准噶尔盆地昌吉油田吉7井区稠油开发中的可行性,开展了原油注CO_2膨胀实验及细管驱替实验,以研究CO_2在研究区稠油中的溶解特性。实验结果表明:(1)在目前16.41MPa地层压力的条件下,当CO_2注入比例达到50mol/mol时可使原油黏度降低42.3%~66.7%,原油密度由0.9011g/cm3降低至0.8428g/cm3,体积系数增大20%,原油膨胀系数增加至1.13~1.24,气油比增加6.3~8倍,饱和压力增大140%~306%;(2)随注入压力提高,地层原油采收率不断增加,气体突破较晚,当注入压力为45MPa时,地层原油采收率为46.68%,表现为非混相驱特征;(3)实验结果表明CO_2对研究区稠油具有很好的降黏和膨胀作用,表明CO_2非混相驱油技术适用于研究区特深层稠油油藏开发。To demonstrate the feasibility of CO2 flooding development of the heavy reservoirs in Well Ji7 of Changji oilfield in the Junggar Basin, experiments on injecting CO2 into crude oil and slim-tube displacement were carried out to investigate the solubility of CO2 in heavy oil. The experiment results proved that：（1） When injecting CO2 at 50 mol/mol at present 16.41 MPa underground pressure, the viscosity of the crude oil was reduced by 42.3%-66.7%, the density was reduced from 0.9011 g/cm3 to 0.8428 g/cm3, the volume factor was increased by 20%, the expansion factor was increased to 1.13-1.24, the gas-to-oil ratio increased by 6.3-8 times, and the saturation pressure increased by 140%-306%.（2） The oil recovery increased with injection pressure, and gas breakthrough was delayed. When the injection pressure was 45 MPa, the oil recovery was 46.68%, and non-miscible displacement worked.（3） CO2 effectively reduced the viscosity and made the crude oil expand in the study area. All these results above show that CO2 flooding technology is effective for the development of deep heavy oil reservoirs in the study area.

关 键 词：昌吉油田 稠油 CO2驱油 细管驱替实验 

分 类 号：TE345[石油与天然气工程—油气田开发工程]