Open Access

ARTICLE

A Reasonable Approach for the Development of Shale Gas Wells with Consideration of the Stress Sensitivity

by Jin Pang¹, Di Luo², Haohong Gao³, Jie Liang⁴, Yuanyuan Huang¹, Qi Liu³

1 Chongqing University of Science and Technology, Chongqing, China.
2 Shunan Gas Production Plant, PetroChina Southwest Oil & Gasfield Company, Luzhou, China.
3 Southwest Gas Production Plant, PetroChina Zhejiang Oilfield Branch, Yibin, China.
4 Linpan Drilling Branch, Sinopec Southwest Petroleum Engineering Co., Ltd., Linpan, China.

* Corresponding Author: Jin Pang. Email: .

Fluid Dynamics & Materials Processing 2019, 15(1), 39-51. https://doi.org/10.32604/fdmp.2019.06136

Abstract

High-pressure deep shale gas reservoirs are usually highly stress-sensitive. When the reasonable production mode of shale gas well is built, the impact of strong stress sensitivity should be fully considered. First, this study calculated the relationship between permeability and formation pressure under different elastic modulus based on the shale lithology of Long Ma Xi formation in Sichuan Basin by testing and analysing the mechanical parameters of the rock. According to numerical simulation result, when the elastic modulus exceeds 14.0 GPa, the stress sensitivity of the matrix will slight affect the cumulative gas production of shale gas. Second, the changing relation between fracture conductivity and permeability with fracture pressure and the time of pressure acts were experimentally studied. The numerical simulation result suggested that the 30-year cumulative gas production considering the stress sensitivity was reduced by 13.5% compared with the 30-year cumulative gas production without considering the stress sensitivity. Finally, the production of different production modes under different stress sensitive characteristics was predicted using numerical simulation method. When the matrix and fractures are fixed with a same stress-sensitive curve, the initial production allocation will not significantly impact the cumulative gas production. When the fractured fractures are subjected to a varying stress sensitive curve, the lower production allocation will result in higher post-production and cumulative gas production.

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Citations