摘要
针对气水同产定容气藏在应用流动物质平衡方程时,随着水气比增加而计算的动态储量逐渐偏大,影响气井生产潜力评价的问题,综合考虑储层含水饱和度、累计产水量、岩石骨架膨胀的影响,建立了一种定容气藏气水两相物质平衡方程。研究结果表明:①建立的方程为隐函数方程,相应的设计为以动态储量、拟压力采气指数双参数约束的迭代求解方法。②经3口气井压恢试井成果验证,在同样使用井口和井底生产数据条件下,气水两相物质平衡方程计算动态储量的平均绝对误差为5%,流动物质平衡方程计算动态储量的平均绝对误差为111%,由此可见,气水两相物质平衡方程准确性更高。③动态储量随着水气比增大而降低,且水气比越高,分别采用气水两相物质平衡方程、流动物质平衡方程计算的动态储量差异越大。
When flowing material balance equation is applied in gas water coproduction volumetric gas reservoirs,as the water-gas ratio increases,the calculated dynamic reserves error gradually tends to increase,and the result affects the evaluation of gas well production potential.To address this problem,a gas-water two-phase material balance equation for volumetric gas reservoir was established by integrating the effects of water saturation,cumulative water production and rock matrix expansion.The results show that:(1)As the equation is an implicit function equation,a corresponding iterative solution method is designed to be constrained by dual parameters of dynamic reserves and pseudo-pressure gas recovery index.(2)Verified by the pressure recovery test results of 3 gas wells,under the same conditions of using wellhead and wellbore production data,the average absolute error of calculating dynamic reserves using the gas-water two-phase material balance equation is 5.0%,and the average absolute error of calculating dynamic reserves using the flowing material balance equation is 111%.By compari son,the accuracy of gas-water two-phase material balance equation is higher.(3)Dynamic reserves decrease as the water-gas ratio increases.And as the water-gas ratio increases,the difference of dynamic reserves calculated by the gas-water two-phase material balance equation and the flowing material balance equation becomes greater.
作者
赵润冬
王锦昌
罗懿
周瑞立
周舰
ZHAO Rundong;WANG Jinchang;LUO Yi;ZHOU Ruili;ZHOU Jian(Research Institute of Petroleum Engineering Technology,Sinopec North China Oil&Gas Company,Zhengzhou 450006,China)
出处
《岩性油气藏》
北大核心
2025年第5期186-192,共7页
Lithologic Reservoirs
基金
中国石油化工股份有限公司项目“致密含水气藏采输关键技术及应用”(编号:P23162)资助。
关键词
气水同产定容气藏
致密气藏
动态储量
拟压力采气指数
气水两相物质平衡方程
流动物质平衡方程
大牛地气田
鄂尔多斯盆地
gas water coproduction volumetric gas reservoirs
tight gas reservoirs
dynamic reserves
pseudopressure gas recovery index
gas-water two-phase material balance equation
flowing material balance equation
Daniudi Gasfield
Ordos Basin
