低渗透气藏水平井产能计算新公式  

A new productivity formula for horizontal well in low permeability gas reservoir

作　　者：刘启国[1] 蒋艳芳[1] 张烈辉[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室西南石油大学,四川成都610500

出　　处：《特种油气藏》2011年第5期71-74,139,共4页Special Oil & Gas Reservoirs

基　　金：教育部博士点基金项目"三维大变化尺度缝洞型碳酸盐岩油藏复杂油水两相流动规律研究"(20105121110006);国家"973"计划项目"碳酸盐岩缝洞型油藏注水开发研究"(2011CB201005)

摘　　要：低渗透气藏由于储层的特殊性,常出现应力敏感、启动压力梯度、高速非达西效应等现象。因此,在低渗透气藏水平井产能分析时,应该考虑这些因素的影响。通过保角变换方法,推导得到同时考虑高速非达西效应、应力敏感和启动压力梯度的低渗透气藏水平井产能新公式。研究结果表明:高速非达西效应、应力敏感、启动压力梯度将使低渗透气藏水平井产量减小;在同一井底压力下,随着应力敏感系数、启动压力梯度的增加,水平井产量降低。该公式对应力敏感性较强的低渗透气藏的开发具有重要的指导意义。Low permeability gas reservoir usually features stress sensitivity,threshold pressure gradient and high velocity non-Darcy effect,which should be considered in analysis of the productivity of horizontal well in low permeability gas reservoir.A new productivity formula for horizontal well in low permeability gas reservoir has been derived through conformal transformation by taking account of high velocity non-Darcy effect,stress sensitivity and threshold pressure gradient.The result shows that high velocity non-Darcy effect,stress sensitivity and threshold pressure gradient will cause the decrease of horizontal well productivity in low permeability gas reservoir;under the same bottom hole pressure,the production of horizontal well will decrease with the increasing of stress sensitivity coefficient and threshold pressure gradient.The formula is of guiding significance to the development of low permeability gas reservoir with strong stress sensitivity.

关 键 词：低渗透气藏 水平井 产能公式推导 高速非达西效应 应力敏感 启动压力梯度 保角变换 

分 类 号：TE33[石油与天然气工程—油气田开发工程] TE348