确定含水气井流入动态关系的新方法  

New Method for Ascertaining Water-Bearing Gas Well Inflow Performance

作　　者：谭晓华[1] 李晓平[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500

出　　处：《新疆石油地质》2013年第1期66-70,共5页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2009E-0307);西南石油大学创新基金(GIFSB0701)

摘　　要：针对高含CO2或H2S气藏的渗流过程中,气体从水中逸出,或水从气体中析出,从而改变气藏渗流特征的实际情况,从渗流力学的基本理论出发,利用质量守恒原理,考虑地层中气水相互溶解和挥发的过程,建立了气水两相渗流的数学模型,推导出受层流系数、紊流系数、气溶水系数及水溶气系数影响的4参数气水两相渗流产能方程。结合相对渗透率辅助方程及水驱气藏的物质平衡压降方程,建立了联合求取气水相渗曲线、单井控制储量与水侵强度的综合渗流模型。通过对气井产气量、产水量、油套压的自动拟合分析,提出了同时求取上述参数(包括4个参数)的自动拟合方法。该分析方法摆脱了确定气井产能必须依靠现场试井的局限,为气水两相流井的产能及动态分析提供了一种新的方法。In the percolation process of a gas reservoir with high C02 and H2S, gas will escape from water or water will separate out from gas, which always changes the gas reservoir flowing performance. This paper presents the gas-water percolation mathematic model based on the seepage mechanics theory, combining with mass conservation equation and considering the dissolution and volatilization of gas and water in the reservoir, by which the deliverability equation influenced by 4 parameters of laminar coefficient, turbulence factor, gas-soluble water coefficient and water-soluble gas coefficient is deduced thereby. Also, the comprehensive seepage model for calculating the gas-water relative permeability curve, single well controlled reserves and water influx intensity is developed by means of relative permeability equation and pressure drop equation for water drive gas reservoir. Through auto-matching analysis of gas production, water production and tubing and casing pressure of gas well, above 4 parameters can be obtained by this auto-matching method. This new method can get rid of the limitation of relying on field well testing to determine a gas well productivity.

关 键 词：两相渗流 流入动态 产能方程 动态储量 自动拟合 

分 类 号：TE312[石油与天然气工程—油气田开发工程]