边水驱气藏中气井产量变化规律分析

DECLINE ANALYSIS OF GAS WELL IN EDGE WATER-DRIVE GAS RESERVOIRS

在边水驱气藏中 ,气井的产量受到边水能量大小的影响 ,研究边水能量大小对气井产量的影响在气田开发中具有重要的意义。用水驱强度来表示将边水能量的大小 ,定义水驱强度为水侵量与气井产量之比 ,建立了考虑水驱强度影响情形下 ,气井定井底压力生产时 ,边水驱气藏中水驱气瞬时渗流的数学模型 ,在获得数学模型的解后 ,作出了边水驱气藏中气井产量变化关系曲线 ,研究了水驱强度及气水流度比对产量变化关系曲线的影响 ,研究表明 ,气井产量受到水驱强度及气水流度比的影响 。

The deliverability of gas well is affected by the magnitude of aquifer energy in edge water-drive gas reservoirs, so it is of real significance to study the effect of aquifer energy on the production of gas well. In this paper, the magnitude of edge-water energy is expressed by the aquifer influx intensity, which is defined as the ratio of aquifer influx to well rate. The fluids flow mathematical model was set up by taking account of edge water-drive while the bottomhole pressure is constant. After solving the mathematical model, the decline curve of gas well in edge water-drive gas reservoir was plotted, based on which we studied the effect of both edge water-drive intensity and gas-water mobility ratio on the decline curve. The results showed that the well deliverability is affected by both water drive and gas-water mobility ratio. The theory presented in this paper can be used to forecast the production of gas well in edge water-drive gas reservoir.