低渗特低渗气藏剩余气分布的描述

QUANTITATIVE DESCRIPTION OF REMAINING GAS DISTRIBUTION IN LOW AND EXTREMELY-LOW PERMEABILITY GAS RESERVOIRS

王昔彬 刘传喜 郑祥克 刘常红 张渝丽 张华

Wang Xibin

低渗特低渗、无明显边、底水的异常高压干气气藏开采一段时间后,储层中不同区域的地层压力下降不均衡,但含气饱和度()却相差不大,用含气饱和度无法准确地描述气藏剩余气的分布状况。因此,人们通常用开采过程中压力的分布来定性描述这类气藏的剩余气分布。根据真实气体的状态方程和可采储量的定义,建立了可采储量采出程度()与地层压力()之间的函数关系,将开采过程中的地层压力分布转化为可采储量采出程度的分布,实现了剩余气分布的定量描述。

After the dry gas reservoir with low and extremely-low permeability,but without identified edged and bottom water has been produced for a period,the formation pressure of different areas decreases inhomogeneously,while the gas saturation () changes slightly,which can not be used to describe accurately the distribution of remaining gas.Therefore,the formation pressure in production process is usually used to describe qualitatively the distribution of remaining gas.According to the state equation of real gas and the definition of recoverable gas reserve,the functional relation between produced degree of recoverable gas reserve () and formation pressure () has been established,by which the formation pressure distribution during production process can be transformed to the distribution of produced degree of recoverable gas reserve, realizing the quantitative description of remaining gas distribution.

10.11743/ogg20030419