考虑应力敏感的气井非达西渗流产能方程  

PRODUCTIVITY EQUATION OF NON-DARCY FLOW IN GAS WELLS WHEN CONSIDERING STRESS SENSITIVITY

作　　者：尚希涛[1] 何顺利[1] 刘辉[1] 胡景宏[1] 杨卫[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《大庆石油地质与开发》2010年第1期70-73,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：复杂天然气田渗流与高效开发技术研究项目（编号：2006BAB03803）资助.

摘　　要：储层应力敏感性是低渗透气藏普遍存在的现象，通过实验的方法研究了低渗透气藏储层岩样围压与渗透率的变化规律。基于此规律推导了考虑应力敏感和非达西渗流共同影响下的气井产能方程，研究了储层应力敏感对气井无阻流量的影响程度。研究结果表明：储层的应力敏感会导致气井无阻流量降低，储层的应力敏感性越强，气井无阻流量降低的幅度越大。实例计算结果显示考虑应力敏感时，苏x井无阻流量与不考虑应力敏感相比降低了13％左右。该研究对确定低渗透气藏产能及制定气井合理生产制度有一定的指导意义。Reservoir stress sensitivity generally exists in low-permeability gas reservoirs. This paper studies the variation laws between confining pressure and permeability in low-permeability gas reservoir samples by using the experimental method. On the basis of the above laws, the productivity equation for gas wells is derived under the consideration of mutual influences of stress sensitivity and non-Darcy flow, and moreover the influence degree of reservoir stress sensitivity on gas wellg open flow potential is studied. The studies show that the sensitivity can result in the reduction of gas wellg open flow potential, the stronger the former is, the more serious the influence on the latter. The computation results of the case study show that the open flow potential of Well Su X reduces 13% or so when considering stress sensitivity. The above studies possess a certain guiding significance for the productivity determination of low-permeability gas reservoirs and the establishment of reasonable operation system.

关 键 词：气藏 应力敏感 非达西渗流 产能 无阻流量 

分 类 号：TE312[石油与天然气工程—油气田开发工程]