超低渗油藏CO_2驱正交试验设计与数值模拟优化  

Orthogonal Test Design and Numerical Simulation Optimization of CO_2 Flooding in Extra-Low Permeability Reservoirs

作　　者：李楠[1] 潘志坚[1] 苏婷[1] 费永涛[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石化河南油田分公司勘探开发研究院,河南南阳473132

出　　处：《新疆石油地质》2017年第1期62-65,共4页Xinjiang Petroleum Geology

基　　金：中国石油科技重大专项(2014B-1208)

摘　　要：低渗油藏是中国当前油气勘探开发的主体,其中超低渗油藏分布范围较广,占比例较大,但超低渗油藏物性差,利用传统的水驱方法难以大幅度提高单井产量。CO_2驱可以膨胀原油体积,降低原油黏度、油水界面张力和油藏毛细管阻力,从而提高驱油效率。为了合理开发超低渗油藏,基于油藏数值模拟与正交试验设计方法,建立超低渗油藏CO_2驱开发模型,对CO_2驱影响因素进行了技术经济评价,分析结果表明,开发效果影响参数从大到小依次为油藏类型、井网密度、注入CO_2体积。综合单井日产量和内部收益率等因素,优选出了适宜超低渗油藏的开发方式,即水平井CO_2驱开发技术以及相应的参数组合。Low permeability reservoirs are the main contributors to the discovered and proved reserves in China currently, among which ex-tra-low permeability reservoirs are widely distributed and account for a large proportion of the reserves. However, extra-low permeabilityreservoirs are characterized by poor physical properties, so it is difficult to enhance single well production by conventional waterfloodingmethod significantly. CO_2 flooding can expand oil volume, reduce oil viscosity, lower interfacial tension and capillary resistance and finallyimprove oil displacement efficiency. In order to develop extra-low permeability reservoirs reasonably and efficiently, based on numericalsimulation and orthogonal design methods, CO_2 flooding models are established for extra-low permeability reservoirs, and technical and eco-nomic evaluations are carried out for the factors influencing CO_2 flooding. The analysis indicates that the parameters influencing develop-ment effect from high to low are reservoir type, well spacing density and injected CO_2 volume. Considering daily well production and inter-nal rate of return and so on, the optimum way to develop extra-low permeability reservoirs is the combination of CO2 flooding in horizontalwells and the corresponding parameters.

关 键 词：超低渗油藏 正交试验设计 油藏数值模拟 水平井 CO_2驱 流度 渗透率 

分 类 号：TE348[石油与天然气工程—油气田开发工程]