低渗透油藏污染井压裂增产率预测模型及敏感性分析  

Prediction model for fracturing incremental recovery of damaged well in low-permeability reservoir and sensitivity analysis

作　　者：何勇明[1] 孙尚如[2] 徐荣伍 高岩[2] 刘辉[4] 

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]河南油田勘探开发研究院,河南南阳473132 [3]青海油田采油一厂,青海茫崖816400 [4]胜利油田河口采油厂,山东东营257200

出　　处：《中国石油大学学报（自然科学版）》2010年第3期76-79,共4页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油化工股份有限公司科技攻关项目(P04050)

摘　　要：针对低渗储层压裂改造后裂缝作用半径内等效启动压力梯度减小的问题,在低渗压裂污染井产能预测模型中引入含启动压力梯度的低速渗流方程,推导径向稳态渗流条件下污染井压裂后增产率预测模型,并对压裂污染井产能影响因素进行分析。结果表明:启动压力梯度的变化对低渗污染井改造后产能影响较大;不同启动压力梯度下,裂缝半长、宽度对增产率的贡献存在差异,且裂缝参数及表皮因子改善程度对增产率贡献均存在最优值。The equivalent start-up pressure gradient within the fracturing radius decreases after reservoir fracturing.A low velocity flow equation including start-up pressure gradient was introduced in the productivity prediction model of fractured wells in low-permeability reservoir.And a prediction model for fracturing incremental recovery of damaged well was developed in radical and steady flow conditions.The influencing factors for productivity of damaged well after fracturing were analyzed.The results show that the variation of start-up pressure gradient has a great effect on productivity of damaged well after fracturing.The contributions of semi-length and width of fractures to incremental recovery are different.Furthermore,the contributions of fracture parameters and improving level of factor skin to incremental recovery have optimization values.

关 键 词：低渗油藏 压裂 启动压力梯度 增产率 

分 类 号：TE348[石油与天然气工程—油气田开发工程]