摘要
基于低渗透油藏非达西渗流理论,考虑基质拟启动压力梯度、压敏效应和裂缝变导流能力,并认为水力压裂裂缝为有限导流能力裂缝,建立了低渗透油藏压裂井的不稳定渗流模型。通过COMSOL有限元软件模拟压裂井的生产动态分析发现,启动压力梯度和压敏效应存在,会明显降低压力井产能。裂缝的变导流能力在时间越长时,对产能和近井压力分布影响越大。该研究对认识低渗透油藏有限导流垂直压裂井的生产动态有积极意义。
Unsteady permeable flow models of low permeability fractured reservoirs are established based on non-darcy permeable flow theory of low permeability reservoirs by considering pseudo start-up pressure gradient,pressure-sensitive effect and variable fracture conductivity of matrix and by considering that the fractures generated by fracturing are the fractures with finite conductivity.It is found through the production performance analyses of fractured wells simulated with COMSOL software that start-up pressure gradient and pressure-sensitive effect can obviously decrease the productivity of low pressure wells.The longer the time while variable fracture conductivity,the larger the influence on the productivity and pressure distribution adjacent to wellbore.The study is significant to recognizing production performance of vertically fractured wells with finite fracture conductivity of low permeability reservoirs.
出处
《特种油气藏》
CAS
CSCD
北大核心
2013年第1期52-55,153,共4页
Special Oil & Gas Reservoirs
基金
国家"十二五"重大专项"薄互层低渗透油藏渗流机理与非线性渗流基础模型研究"(2011ZX05051)
关键词
低渗透油藏
垂直压裂井
生产动态
low permeability reservoir
vertical fracture
production performance
