水平气井产量公式对比及影响因素分析

COMPARATIVE STUDY OF HORIZONTAL GAS WELL PRODUCTION EQUATION AND ITS INFLUENCE FACTORS ANALYSIS

在油气田开发过程中,水平井以其泄油面积大、生产井段长、井底压降小等优势,得到了广泛应用。到目前为止,国内外对水平井产量公式推导比较多,但多数都是基于油藏推导出来的,因此在气藏的应用中需要根据气相渗流与液相渗流的相似原理,对水平油井产量公式进行改进。文章整理了目前国内外常用的几种水平井产量公式,并对其进行改进,给出了各自对应的水平气井产量公式。而且通过对各公式计算结果及其影响因素进行对比研究发现,Renard-Dupuy公式的计算结果最大,窦宏恩公式计算结果最小,其它几种公式的计算结果比较相近且受参数影响较小,这对以后气藏水平井的产能研究有一定的借鉴意义。

During the development of oil and gas reservoir, horizontal well has much superiority, like larger oil drain area, longer producing interval and smaller pressure drop of well bottom, so horizontal well was applied widely. Up to now, many equations about horizontal well production were deduced at home and abroad based on the oil reservoir data, therefore in gas reservoir, these equations needed be improved on the basis of the principle of similitude of gas and liquid phase percolation in porous medium. In this paper, a few of horizontal well production equations that often were used were improved, and the calculation results and influential factors of each equation were contrasted and analyzed. The results showed that the calculated value of Renard-Dupuy equation was biggest, that of Douhongen equation was smallest. The calculation results of other equations were close and were affected less by parameters.