摘要
针对低渗透油藏进行水力压裂后形成的有限导流垂直裂缝,利用质量守恒和椭圆流法建立了考虑启动压力梯度低渗透油藏椭圆流数学模型.应用拉普拉斯变换求得低渗透油藏有限导流垂直裂缝井无因次产量表达式.运用Stefest数值反演分析了影响低渗透油藏有限导流垂直裂缝井产能的诸多因素.结果表明,裂缝表皮和无因次导流能力对垂直裂缝井产能的影响主要集中在生产早、中期.随着生产时间的推移,启动压力梯度对产能的影响越来越明显,压裂低渗透油藏开采后期应该考虑启动压力梯度对产能的影响.
Aiming at vertical fractures with limited conductivity formed after hydraulic fracturing in low permeability reservoir, elliptic flow mathematical model considering starting pressure gradient is established with mass conservation and elliptic flow method. Non-dimensional expression for vertical fractures with limited conductivity in low permeability reservoir is calculated based on Laplace transform. Influential factors of productivity are analyzed with Stehfest＇ s inverse transform method. Results showed that the impact of fracture skin and dimensionless conductivity on productivity of vertically fractured wells mainly exists in early and mid-term production period. The effect of starting pressure gradient on productivity increases along with production time. Therefore, during late development stage of fracturing low permeability reservoir, the impact of start-up pressure gradient should be considered carefully.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2010年第5期77-80,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油重点工程攻关项目（2008ZX05046-04）资助.
关键词
低渗透
启动压力梯度
垂直裂缝
有限导流
椭圆流
low permeability
starting pressure gradient
vertical fractures
limited conductivity
elliptic flow
