应力敏感性低渗透气藏垂直裂缝井非达西渗流产能分析  

Productivity Analyses of Non-Darcy Permeable Flow in Stress-sensitivity and Low-permeability Gas Reservoirs with Vertical Fractures

作　　者：曾杨 贺陆军[2] 廖剑波[2] 杨丹[2] 李波[2] 

机构地区：[1]中海油研究中心,北京100027 [2]中油新疆油田分公司,新疆克拉玛依834000

出　　处：《特种油气藏》2012年第5期90-92,96,共4页Special Oil & Gas Reservoirs

基　　金：国家"973"计划"碳酸盐岩缝洞型油藏注水开发研究"(2011CB201005)

摘　　要：由于前人对低渗透气藏压裂井的产能研究均没有同时考虑应力敏感和高速非达西效应的影响,导致预测的产能与实际产能存在一定差异。因此,采用保角变换方法,将低渗透气藏垂直裂缝井的复杂渗流问题转化为相对简单的单向渗流问题,根据Forchheimer非达西流动方程,推导了同时考虑应力敏感和高速非达西效应的低渗透气藏无限导流垂直裂缝井的产能公式,根据所得公式绘制了不同应力敏感系数影响下的理论产能曲线,并结合现场实例进行了验证。研究表明:应力敏感对低渗透气藏压裂井的产能影响较大,并且随着应力敏感系数的增加,产能逐渐减小。该计算方法便于现场应用,具有较强的实用价值。The forefather's study on the productivity of the gas wells of fractured low permeability gas reservoirs which does not consider the effect of stress-sensitive and high speed non-Darcy effect results in the difference of predicted productivity from real productivity.Therefore,the paper has derived a productivity formula of low permeability gas reservoirs with vertical fractures which have infinite conductivity under the conditions of simultaneously considering stress-sensitive and high speed non-Darcy effect by using the conformal transformation principle and the conversion of the complex low permeability of gas reservoirs with vertical fractures into a single direction permeable flow and based on Forchheimer equation.Based on the formula got above a theoretical productivity formula under the effect of different stress-sensitive coefficients is obtained and the formula is verified in field application.The study shows that stress-sensitive greatly influence the productivity of fractured wells of low permeability gas reservoirs and productivity decreases with the increase in stress-sensitive coefficients.The methods of calculation is easy to be applied in field and is really practical.

关 键 词：低渗透气藏 压裂井 产能 应力敏感 高速非达西效应 

分 类 号：TE348[石油与天然气工程—油气田开发工程]