摘要
气水同产井是有水气藏开发中后期所出现的一种普遍现象 ,此时地层的渗流特征不同于单相气体渗流特征 ,必然导致气水同产井的压力动态特征不同于纯气井 ,即气水同产井的流入动态不同于纯气井 ,而气水同产井的流入动态是动态分析及井筒举升的基础 ,关于气水同产井流入动态的研究 ,国内外还未见相关的文献报道 ,文章的研究作了有益的尝试。文章基于质量守恒原理 ,建立了气水两相地层瞬态渗流的数学模型 ,通过定义气水两相拟压力函数 ,将渗流数学模型线性化 ,在获得数学模型解后 ,考虑地层损害和非达西效应的影响 ,推导出在地层中为水气两相渗流的气水同产井的二项式产能方程 ,从而建立了气水同产井瞬态流入动态关系曲线的理论。由此 ,可以作出气水同产井的流入动态关系曲线 。
Gas-water well is commonly found in the middle-late stage of water-carrying gas reservoir development. At this time, the flow characteristics of gas and water in formation are different from those of single-phase gas, thus inevitably causing that the characteristics of pressure performance (or inflow performance) of gas-water well are distinct from those of net-gas well. The inflow performance of gas-water well is the fundament of performance analysis and wellbore lifting. The research on inflow performance of gas-water well in this paper is a good try and relevant report hasn't been found in domestic and foreign literatures. On the basis of the principle of mass conservation, a mathematical model of gas-water two-phase transient flow in formation was set up and it was linearized through defining gas-water two-phase pseudo-pressure function. After achieving the solution of the mathematical model, a binomial productivity equation of gas-water well with two-phase flow in formation was derived in consideration of the influence of formation damage and non-Darcy effect, thus establishing the theory of transient inflow performance relationship curve of gas-water well. Based on this, the transient inflow performance relationship curve of gas-water well may be drawn up and a theoretical fundament is provided for the performance analysis of gas-water well.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2001年第3期65-67,共3页
Natural Gas Industry
