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水平井是提高油气井产量的一个重要工具,无论是水平油井还是水平气井,其产能分析方法都是油气藏工程研究的重要内容。利用解析式预测油藏水平井的产能公式比较多,但是对于气藏水平井产能的预测相对较少。本文从气体地下稳定渗流基本原理出发,利用保角变换建立了水平气井产能分析数学模型,并得到气藏水平井的产能公式。在此基础上,分析了水平井段长度、气层厚度等因素对水平气井流入动态曲线的影响。
Horizontal wells are an important tool to increase the production of oil and gas wells. Both horizontal and horizontal gas wells, productivity analysis methods are important part of reservoir engineering research. There are a lot of formulas for predicting productivity of horizontal wells in analytical reservoir, but there are relatively few predictions for horizontal well productivity. Based on the basic principle of underground gas seepage stability, this paper established a mathematical model of productivity analysis of horizontal gas wells by using conformal mapping and obtained the productivity formula of horizontal wells in gas reservoirs. On this basis, the influence of horizontal well length, thickness of gas layer and other factors on the inflow dynamic curve of horizontal well is analyzed.