非达西效应及范围对低渗透气藏井控储量的影响  

Influence to Well-Controlled Reserves in Low Permeability Gas Reservoir of Non-Darcy Flow Effect and Its Scope

作　　者：陈余[1] 付玉[1] 卞小强[1] 朱泽正 

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

出　　处：《油气井测试》2017年第6期14-18,共5页Well Testing

基　　金：国家自然科学青年基金"基于离子变化的高温高压CO2-烃-地层水热力学实验及理论研究"(51404205)内容

摘　　要：低渗透油气藏中由于存在非达西渗流效应,其渗流规律不同于常规油气藏,常规的单井控制储量计算方法已不再适合。针对存在高速非达西流动和启动压力梯度的特点,考虑气井的高速非达西流动范围和半径,重新推导了低渗气井考虑启动压力梯度和高速非达西效应的井控半径及井控储量计算公式,分析了井控半径及储量随时间变化规律。结果表明,气井在高速非达西区域压力传播慢,高速非达西流动半径1.004 m,压力传播时间166.24h;气井生产未达到高速非达西边界时,井控储量随产气量的增加而减小,随速度系数的增加而减小;气井生产超过高速非达西边界时,井控储量随产气量的增加而增加,随启动压力梯度的增加而减小。Because of non-Darcy percolation effect in low permeability reservoir,the seepage law is different from that of conventional oil and gas reservoirs,and the general calculation method of single well-controlled reserves is no longer suitable.Aiming at the characteristics of high speed non-Darcy percolation and starting pressure gradient,considering the high-speed non-Darcy flow radius of gas well,a formula for calculating the well-controlled radius and reserves of the low permeability gas well with nonDarcy effect is established and the variation of well control radius and reserves over time are analyzed.The results indicate that gas well pressure spread slowly in the region of the high-speed non-Darcy,high-speed non-Darcy flow radius is 1.004 m,pressure propagation time is 166.24 h;when the production of gas well do not research the high-speed non-Darcy boundary,well control reserves decreases with the increase of gas production and the speed coefficient;when the production of gas well is more than the non-Darcy border,well control reserves increases with the increase of gas production,and decreases with the increase of start-up pressure gradient.

关 键 词：高速非达西 流动半径 启动压力梯度 低渗透气藏 井控储量 

分 类 号：TE353[石油与天然气工程—油气田开发工程]