岩土力学Issue(9)：2535-2542,8.
复杂岩性储层渗透率-应力敏感性及其对气井产能的影响
Permeability-stress sensitivity of complex lithology reservoir and its effect on gas well productivity
摘要
Abstract
Permeability-stress sensitivity of complex volcanic reservoir has been studied using the variable pore pressure-constant confining pressure method. Meanwhile, permeability stress-sensitivity obtained from two different experimental methods also has been compared. The experimental results indicate that the volcanic reservoir permeability declines with the decrease of reservoir pore pressure. Decrease of reservoir permeability mainly occurs in the pore pressure from 40 MPa to 25 MPa. There is no good relationship between rock initial permeability and its loss rate, which is different from that of the sedimentary sandstone reservoir. Permeability-stress sensitivity of tight volcanic gas reservoir obtained from variable pore pressure-constant confining pressure is much stronger than that obtained from constant pore pressure-variable confining pressure. And this difference becomes larger during the actual gas reservoir effective stress range. The gas well productivity equation has been mathematically derived taking permeability-stress sensitivity into consideration. Numerical results show that the absolute open flow potential(AOF) when considering the permeability-stress sensitivity is about 63.28%of that when the permeability is considered as constant during the gas reservoir production.关键词
复杂岩性储层/火山岩气藏/渗透率-应力敏感性/有效应力/孔隙压力/孔隙结构Key words
complex lithology reservoir/volcanic gas reservoir/permeability-stress sensitivity/effective stress/pore pressure/pore structure分类
能源科技引用本文复制引用
苟燕,孙军昌,杨正明,周学民..复杂岩性储层渗透率-应力敏感性及其对气井产能的影响[J].岩土力学,2014,(9):2535-2542,8.基金项目
国家油气重大专项（No.2011ZX05013-006）。 （）
