一种计算地层压力下降岩石压缩系数新方法

根据岩石的孔隙体积压缩系数Cp和孔隙压缩系数C定义,引入岩石体积应变εV,推导出地层压力下降岩石压缩系数理论关系,提出了一种计算地层压力下降岩石压缩系数新方法,并结合模拟有效压力增加岩石变形实验,通过将地面实验数据转换为地层条件孔隙度变化数据,并实例计算了地层压力下降岩石的孔隙压缩系数和孔隙体积压缩系数变化规律。应用结果表明,该方法与常规方法计算结果吻合性很好。

A new method of calculating rock compressibility of formation pressure drop

According to the definition of rock pore compressibility and rock pore volume compressibility, this article defined rock volumetric strain, developed the theoretical formula of rock pore compressibility and rock pore volume compressibility of formation pressure drop, proposed a new method to calculate the rock compressibility of formation pressure drop, obtained rock porosity change data in the formation condition from the experimental data in the surface condition by simulating effective pressure increase experiment, and calculated the rock pore compressibility and rock pore volume compressibility changing rule of formation pressure drop in the example gas reservoir. The calculated results using this new method coincide well with the traditional method.