低渗透变形介质气藏压裂井产能分析  

Productivity analysis of hydraulically fractured gas well in low permeability-deformed media reservoirs

作　　者：刘捷[1] 廖锐全[1] 杨振平[2] 

机构地区：[1]长江大学石油工程学院,湖北荆州434023 [2]胜利石油管理局钻井四公司,山东东营257091

出　　处：《断块油气田》2011年第3期357-359,372,共4页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目"复杂动态网络的优化计算及其应用"(60873021);湖北省高校优秀中青年创新团队项目"低渗透油藏生产井动态仿真与优化决策技术"(T200803)

摘　　要：低渗透变形介质气藏压裂井生产过程中,气体渗流一般不遵循达西定律,而是存在启动压力梯度和介质变形影响的低速非达西渗流。变形介质的渗透率随有效应力的增大而降低,一般与压力变化呈指数关系。为此,基于压裂井三线性渗流模型,建立并求解了低渗透变形介质气藏考虑启动压力梯度和介质变形影响的有限导流垂直裂缝井不稳定渗流的数学模型,来研究低渗透气藏压裂井定产量生产时井底压力的变化规律。计算结果表明,井底压力随启动压力梯度的变化很小,随介质变形系数的增大而减小,随裂缝导流能力的减小而增大。Fluid flow follows the low rate non-Darcy law considering start-up pressure gradient and media deformation in the production process of hydraulically fractured gas well in low permeability-deformed media gas reservoir instead of Darcy flow.An exponential relationship takes into account the reduction in permeability caused by an increase in effective stress for two common parameterized pressure-permeability functions.Thus,this paper established a mathematical model of transient flow in vertically fractured well with limited conductivity considering start-up pressure gradient and media deformation.This model based on the trilinear flow model researched the bottom-hole pressure changes of low permeability-deformed media gas reservoir for the constant oil production.Calculating results show that the bottom-hole pressure has a little change with the start-up pressure gradient increase and it reduces with media deformed coefficient and fracture conductivity increase.

关 键 词：低渗透 变形介质 压裂气井 三线性流模型 

分 类 号：TE312[石油与天然气工程—油气田开发工程]