CO2混相驱注入能力预测理论研究及实例分析  

THEORETICAL RESEARCH AND EXAMPLE ANALYSIS OF INJECTIVITY PREDICTION OF CO2 MISCIBLE FLOODING

作　　者：尚庆华[1] 吴晓东[1] 安永生[1] 王旭东[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《大庆石油地质与开发》2011年第3期150-153,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：基金项目：国家“863”计划“CO2驱油提高石油采收率与封存关键技术研究”（2009AA063404）资助.

摘　　要：为确定注CO2时储层吸气能力预测方法，在前人研究的基础上，建立了二维CO2混相段塞驱物理模型和数学模型，考虑混相段塞对注入过程的影响，经理论推导形成了CO2混相驱注入能力预测模型。实例计算结果显示：CO2混相驱注入压力与注入速度近似成线性关系，且注入压力越大，注入速度也越大；注入能力随累计注入量、混相段塞长度的增加而增强，且随它们的不断增大，注入能力增幅越来越明显。分析认为，这是由于超临界CO2区及混相段塞区的形成减小了地层的渗流阻力，且随着它们区域的增大，对减小整个地层渗流阻力的贡献也越来越大。In order to determine the prediction method of gas-intake capacity of reservoir when CO2 injection, based on the previous research, the 2D physical and mathematical models for CO2 miscible slug flooding are established. Considering the influence of miscible slug on injection process, the forecasting model of injectivity of CO2 miscible flooding is formed through the theoretical deduction. The calculation result of field ease shows that there is an approximate linear relation between injection pressure and injection rate of CO2 flooding, moreover, the higher the injection pressure is, the bigger the injection rate. The injectivity will become stronger with the increase of cumulative injeetion rate and miscible slug length, moreover, the incremental amplitude of injectivity will become more obvious with the increase of them. It is thought through analysis that the formation of supereritieal CO2 and miscible slug zones decrease the seepage resistance of formation, and their contribution to deerease the seepage resistance of the whole reservoir becomes increasingly greater with the increase of these zones.

关 键 词：CO2混相驱 物理模型 数学模型 混相段塞 累计注入量 注入能力 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]