含累积产量三次方项的异常高压气藏物质平衡新模型及计算

基于异常高压气藏物质平衡方程式, 假设异常高压模型参数为累积产量的线性函数, 提出含有累积产量三次方项的新的物质平衡方程。此方法不需要考虑地层及流体压缩系数, 仅需历史生产数据, 采用多元回归分析即可确定回归分析式中的各项参数, 进而求出异常高压气藏的原始地质储量和累积有效压缩系数。通过实例应用和对比分析, 证明该新方法是实用而有效的。

A New Material Balance Model of an Abnormally Pressured Gas Reservoirs Which Contains Cubic Term of Cumulative Production and Its Calculation

Based on the material balance equation of abnormally pressured gas reservoirs, assuming abnormal pressured model parameter being a linear fuction of cumulative gas production, the authors propose a new material balance equation which contains cubic term of cumulative production. This method only requires the data of production and don't consider the formation and fluid compressibility. The parameters can be determined by multiple regression analysis through historical data of the production. Gas-in-place and cumulative effective compressibility could be determined by the new material balance equation. The new method is applicable and effective through the application and comparative analysis of examples.