A comprehensive seepage model of shale gas reservoir and pressure behavior analysis

被引：0

作者：

Du, Dian-Fa ^{[1
]}

Wang, Yan-Yan ^{[1
]}

Zhang, Qiong ^{[1
]}

Qiao, Ni ^{[1
]}

Liu, Yang ^{[1
]}

机构：

[1] College of Petroleum Engineering, China University of Petroleum

来源：

Natural Gas Geoscience | 2014年 / 25卷 / 04期

关键词：

Adsorption; Cross flow; Diffusion; Multi-stage fractured horizontal well; Pressure behavior; Shale gas; Storativity ratio;

D O I：

10.11764/j.issn.1672-1926.2014.04.0612

中图分类号：

学科分类号：

摘要：

Different from conventional gas reservoir, shale reservoir's seepage mechanism is controlled by adsorption, diffusion, cross flow and Dracy flow, and consequently its seepage mechanism is very complicated. In this paper, desorption is taken into consideration. Considering the existence of pressure difference, except for diffusion, cross flow is introduced. In order to describe diffusion and cross flow respectively, two new parameters are introduced respectively to represent influences of the two factors. Then a comprehensive model for multi-stage fractured horizontal wells in shale gas reservoirs has been built. And on this basis, by means of the modified Lord Kelvin point source function and principle of superposition the expression of the solution has been obtained. Using Laplace inversion and Stehfest integral transformation, the bottomhole pressure of multi-stage fractured horizontal wells can be calculated, and the typical pressure curve and the contrast of the new and old mathematical model can be obtained, which can provide theoretical references for shale reservoir's well testing and transient production evaluation.

引用

页码：612 / 617

页数：5

共 12 条

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