边水气藏水侵特征识别及机理初探

对于有水气藏,正确认识地层水活动规律是非常重要的。为了正确判断边水气藏水侵特征，文章对一些边水气藏出水气井生产动态数据及其产层的物性参数进行了统计和对比，研究了不同气井动、静特征的共性和差异，借助数学表达式对气井出水变化规律进行了描述，并根据数学表达式将出水类型分为线形型、二次方型及多次方型等３类。分析了３种出水类型与储层物性之间的因果关系，提出气井出水特征是井区储层物性展布特征的反映。在假设井区为正方形含气区域、１口生产井位于区域内偏向水侵方向一侧、井与水侵边之间有一相对高渗透带连通的基本模式下，研究了水侵机理，提出了边水气藏水侵特征分类及识别图版。通过实际出水气井生产史拟合检验，所提出的分析方法和识别图版是行之有效的，有助于正确地定量认识边水气藏地层水活动规律，为实际生产管理中制定相应的治水措施提供了一种有利的分析手段。

A PRELIMINARY DISCUSSION ON MECHANISM AND RECOGNITION OF WATER INVASION CHARACTERISTICS IN EDGE WATER DRIVE GAS RESERVOIRS

A correct understanding of regularity of formation water movement is very important for gas reservoirs with water. In order to correctly recognize water invasion characteristics of edge water drive gas reservoirs, the production performance data of some water producers and the poroperm characteristics of pay zones in edge water drive gas reservoirs are counted and compared. The similarities and differences of dynamic and static features of gas wells are studied, and regularity of water production are described by using mathematical formulas and are divided into linear, quadratic power and multiple power types. The cause effect relationships between these 3 types of water production and reservoir poroperm characteristics are analyzed and it is believed that water production characteristics of a gas well can reflect the characteristics of reservoir distribution in this wellblock. Assuming a square gas-bearing wellblock, with one producer positioned at the water invasion side and communicating with water invasion edge through a relatively high-permeability zone, mechanism of water invasion is studied and chart boards for classification and recognition of water invasion characteristics in edge water drive gas reservoirs are presented. Case production history fitting of water producer verifies that the analytical method and recognition chart board are effectual, can contribute to accurate and quantitative analysis of regularity of formation water movement in edge water drive gas reservoirs, and provide a favorable analytical tool to take relevant water control measures in practical production management.