CO2吞吐增油机理及数值模拟研究  

RESEARCH ON CO2 STIMULATION MECHANISM AND NUMERICAL SIMULATION

作　　者：赵彬彬[1] 郭平[1] 李闽[1] 黄琴[1] 李骞[1] 

机构地区：[1]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：《大庆石油地质与开发》2009年第2期117-120,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重点基础研究发展规划“973”项目（2006CB705804）资助.

摘　　要：由于与其他气体相比较，CO2与原油接触达到混相所要求的压力更低一些，且CO2气藏丰富，这使得CO2成为三次采油中优先选用的气体。通过室内注CO2膨胀实验，研究了CO2溶于原油后使其体积膨胀、黏度降低，以及CO2对原油中轻质组分的萃取作用、内部溶解气驱作用、酸化解堵作用等增油机理。结合数值模拟技术，运用广泛被采用的CMG2005数值模拟软件中的Builder储层建模软件对SW油田A2模拟井建立单井地质模型，分析了影响CO2吞吐效果的部分参数，包括周期注入量、焖井时间、注气速度。结果表明，焖井时间和注气速度不是影响该油藏注CO2吞吐效果的最敏感参数，周期注入量则是影响吞吐效果最敏感的施工工艺参数，并在此基础上从多套吞吐设计方案中优选出适合该油藏注CO2吞吐的最佳施工工艺参数。CO2 is usually preferred in tertiary recovery process because of large number of CO2 reservoirs and its miscibility pressure lower than that of other gases. Through CO2 injection swelling laboratory experiment, this paper studies stimulation mechanism of CO2 expanding volume and reducing viscosity of oil after CO2 dissolved in oil, and mechanism of extracting light component from oil, inner dissolved gas driving and acidizing broken down. In combination with numerical simulation method, this paper establishes a single well geologic model for simulating Well A2 in SW Oilfield by using Builder reservoir modeling software from widely used CMG 2005 numerical simulation software, and it analyzes some parameters that affect CO2 stimulation effect including cyclic injection volume, stewing well period and gas injection rate. Result shows that cyclic injection volume, not stewing well period or gas injection rate, is the most sensitive operation process parameter that affects huff-and-puff effect. In the end, operation process parameter suitable for injection of CO2 into SW Oilfield is optimized from several designed programs based on this study.

关 键 词：CO2吞吐 膨胀实验 增油机理 数值模拟 吞吐效果 影响因素 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]