水驱气藏的水驱特征曲线与应用效果分析

Research and application effect analysis on water-drive characteristic curve for water-drive gas reservoir

水驱气藏气井见水后,产气产水规律复杂,使得水驱气藏开发难度显著增大。就目前水驱气藏而言,缺乏相应成熟有效的动态分析方法。从气、水两相渗流规律和物质平衡方程出发,推导出了水驱气藏的水驱特征曲线,即累计产气量与气水比呈对数关系,在半对数坐标上呈线性关系,矿场可以根据直线的斜率反算见水后气井的动态控制储量,通过某气田气井开发动态检验,该研究成果可以有效预测气井的开发动态和开发过程中动态控制储量的变化,对于水驱气藏开发具有一定指导意义。

Water/gas-yielding rules in the water-drive gas reservoir become complicated after water breakthrough, which results in the increasing difficulty of the water-drive gas reservoir development. At present, there is no mature and effective dynamic analysis method in developing the water-drive gas reservoir. Based on the gas-water two-phase flow law and the material balance equation, the water-drive characteristic curve of water-drive gas reservoir was developed in this paper, in which the cumulative gas production is in logarithmic relation with gas-water ratio, and in linear relation on semi-logarithmic coordinates. And the dynamic control reserve of gas well after water breakthrough can be inversely calculated by the slope of the line. By the application on a certain gas field, the research results were proved to be able to effectively predict the gas wells development performance and the dynamic control reserve variation during development. And it is of great significance to the development of water-drive gas reservoir