Journal
NATURAL RESOURCES RESEARCH
Volume 30, Issue 3, Pages 2361-2376Publisher
SPRINGER
DOI: 10.1007/s11053-021-09853-1
Keywords
Stress sensitivity effect; CBM wells; Gas production; High-yield area; Fanzhuang Block
Categories
Funding
- National Natural Science Foundation of China [41772132, 41502157, 41530314]
- Key Project of the National Science Technology [2016ZX05044001]
- Fundamental Research Funds for the Central Universities [2652019095]
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The stress sensitivity effect in coalbed methane development is influenced by factors such as confining pressure, cleat compressibility, and regional distribution. Various coalbed methane production areas are affected by different levels of damage, leading to variations in productivity performance.
Results of stress sensitivity experiments show that, when the confining pressure reaches 15.5 MPa, six coal cores have strong stress sensitivity effect (SSE) and cleat compressibility varying from 0.0286 to 0.0725 MPa-1. The development of coalbed methane (CBM) is a process of drainage and pressure reduction, which causes inevitable stress-related damage to coal reservoirs. CBM production is affected by different stress-related damage levels, and the damage level depends on different reservoir conditions, working systems, and development stages. The Gu, Huagu, and Pu-Punan zones have high-yield wells with NW-SE distribution, while the Huayna and Huaxi zones have high-yield wells with NE-SW distribution. Based on the stress damage mechanism of reservoir permeability, the factors that control SSE are tectonic stress field, reservoir pressure, and fracture pressure, which in turn affect the productivity changes of CBM wells.
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