Optimization of multi-stage cluster spacing in deep coal seam horizontal wells considering cleat

CHE Hengda; HUANG Hao; CHEN Mingzhong; KONG Xiangwei; GUO Lianglin; ZHANG Hao

doi:10.13347/j.cnki.mkaq.20240395

Safety in Coal Mines > 2024 > 55(11): 69-76. > DOI: 10.13347/j.cnki.mkaq.20240395

CHE Hengda, HUANG Hao, CHEN Mingzhong, et al. Optimization of multi-stage cluster spacing in deep coal seam horizontal wells considering cleat[J]. Safety in Coal Mines, 2024, 55（11）: 69−76. DOI: 10.13347/j.cnki.mkaq.20240395

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Optimization of multi-stage cluster spacing in deep coal seam horizontal wells considering cleat

CHE Hengda^{1, 2,},
HUANG Hao^{1, 2},
CHEN Mingzhong³,
KONG Xiangwei^{1, 2, ,},
GUO Lianglin^{1, 2},
ZHANG Hao^{1, 2}

1.
School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
2.
Hubei Provincial Key Laboratory of Oil and Gas Drilling and Production Engineering, Yangtze University, Wuhan 430100, China
3.
Downhole Service Company, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610051, China

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Received Date: March 21, 2024
Revised Date: June 20, 2024

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Abstract

Abstract

In order to study the horizontal well multi-segment multi-cluster fracture extension in the deep coal reservoir where the cleat fissures are developed, a multi-segment multi-cluster fracture extension model is created based on the extended finite element and taking into account the inter-seam interference and the induced stress field. With the secondary development of pre-processing in Python language, a large number of approximately orthogonal cleat fissures were added into the model. The effects of cluster spacing, fracturing sequence and segment spacing on multi-fracture extension were analyzed, and the advantages and disadvantages of fracturing effect were verified by querying the number of fracture-communicating cutting groups. The simulation results show that when the cluster spacing is 20 m and the segment spacing is 40-45 m, the number of fracture communication cutting groups is relatively high, and the fracture length is optimal due to the small influence of inter-seam interference and induced stress field; at the aspect of the influence of different fracturing sequences on the extension of multi-fractures, the fracturing effects are ranked from excellent to poor: sequential fracturing > alternating fracturing > synchronous fracturing. The results of modeling and field application are in good agreement, with 96.5% for the second fracturing section and 93.4% for the third fracturing section.
- deep coal-rock reservoir,
- segmented cluster fracturing,
- cleat fissure,
- induced stress,
- extended finite element

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References

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Optimization of multi-stage cluster spacing in deep coal seam horizontal wells considering cleat