摘要
在天然水驱气藏的开采过程中,随着累计产气量的增加,气层地层压力逐渐下降,边底水在压差的作用下不断进入气层,降低了气相的饱和度,从而降低气相渗透率,影响了气井的正常生产,如何准确计算出水侵量对于气藏的生产预测显得尤为重要。文中提出利用气藏的生产动态数据计算水侵量,避免了传统方法对水体参数的推测和计算过程的繁琐及计算结果的不确定性,实例表明该方法结果准确、过程简便、实用性强。
During the production in water-drive gas reservoir,bottom-and edge-water enter into gas reservoir continuously under a certain pressure difference;and gas-phase saturation decreases as an increase of cumulative production rate as well as a gradual decrease of formation pressure in gas reservoir.So,gas-phase permeability decreases and effects on normal production of gas wells.Furthermore how to calculate accurately the water flux rate is important for production prediction.The paper presents a method to calculate the water flux rate by the means of production performance data.Different from the conventional methods,this method avoids presuming the water-body parameters,reduces the tedious calculation and uncertainties.The experiments prove that method is accurate,simple and practical.
出处
《天然气勘探与开发》
2006年第4期36-39,74,共4页
Natural Gas Exploration and Development
关键词
异常高压
凝析气藏
水侵量
物质平衡方程
压降法
abnormal high-pressure,condensate gas reservoir,water flux rate,material balance equation,drawdown method
