稠油油藏蒸汽吞吐后转注CO_2吞吐开采研究  

Study on cyclic carbon dioxide injection after steam soak in heavy oil reservoir

作　　者：沈德煌[1] 张义堂[1] 张霞[1] 吴淑红[1] 李春涛[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]新疆油田分公司勘探开发科学研究院,新疆克拉玛依834000

出　　处：《石油学报》2005年第1期83-86,共4页Acta Petrolei Sinica

基　　金：中国石油天然气股份有限公司重点科技攻关项目(020107 4 1)"改善稠油蒸汽吞吐效果开采技术"部分成果。

摘　　要：利用物理模拟技术,对蒸汽吞吐后期的稠油油藏转注CO2 吞吐技术以改善其开采效果的机理进行了研究,结果表明,蒸汽吞吐后期油藏转注CO2 吞吐开采:①增加了弹性驱能量;②CO2 溶解于稠油中,使原油粘度降低;③乳化液破乳:高轮次吞吐使原油物性变差,粘度大幅度增高;而CO2 溶解于稠油和水中降低了油水界面张力,使原油粘度大幅度下降;④油水相对渗透率曲线特征得到改善,残余油饱和度降低。实验研究及现场试验结果表明,稠油油藏蒸汽吞吐后期转注CO2 吞吐开采在技术上和经济上都是可行的。该技术改善了稠油油藏蒸汽吞吐后期的开发效果。The cyclic carbon dioxide injection technology to improve heavy oil production after steam soak was studied by physical simulation. The mechanisms of cyclic carbon dioxide injection were investigated. The results show that injection of carbon dioxide into heavy oil reservoir in the late steam soak period can increase expansion energy and decrease oil viscosity and also demulsify the emulsion formed in the steam soak process. In general, carbon dioxide dissolved in the heavy oil can reduce oil-water surface tension and result in breakdown of the emulsion. Also, the injected carbon dioxide can change oil-water relative permeability and lower the remaining oil saturation. The field pilot test shows that cyclic carbon dioxide injection after steam soak is successful in technology and has the economic benefits. Both physical simulation and pilot test show that cyclic carbon dioxide injection technology after multicycle steam soak is economically feasible to improve the development results for heavy oil reservoir.

关 键 词：稠油油藏 物理模拟 蒸汽吞吐 二氧化碳吞吐技术 油藏开采机理 现场试验 

分 类 号：TE345[石油与天然气工程—油气田开发工程]