| Autor: |
LI Daoqing, WANG Yang, WANG Bin, YAN Liheng, ZHAO Chuankai, WANG Haitao |
| Předmět: |
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| Zdroj: |
Journal of Northeast Petroleum University; Oct2023, Vol. 47 Issue 5, p71-81, 11p |
| Abstrakt: |
Considering the coexistence of matrix pores and fractures, the coexistence of discrete fractures and continuous medium fractures, stress sensitivity effect and the influence of three zones with different physical properties, this paper presents a transient pressure analysis model for wells intersecting with discrete fractures n the ultra-deep and ultra-light pressure fractured tight sandstone gas reservoirs. The Laplace transformation, Pedrosas transformation and perturbation technique are adopted to solve the proposed model, and the type curves are calculated and plotted by programming. Flowing periods were identified according to the characteristics of type curves and the sensitivity analysis of influential factors were conducted. The results show that up to fourteen typical flowing periods can be observed on the type curves of the fractured wells in this kind of complex gas reservoirs. When there is a stress sensitive effect, the position of the pressure derivative curves during the middle and later flowing periods will be higher. The longer the discrete fractures encountered by the gas well, the lower the position of the derivative curve during the linear flow stage and other flowing stages of the fracture network system in zone I. The mobility ratio mainly affects the height of the pressure derivative curves during the pseudo- radial flow and inter-porosity flow stages. The smaller the storage capacity ratio, the deeper the corresponding concave on the pressure derivative curve. The smaller the inter-porosity flow coefficients of each region, the later the corresponding concave on the pressure derivative curve appears. This work can provide support for well testing interpretation techniques for the ultra-deep and ultra-high pressure naturally fractured complex gas reservoirs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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