Study on optimization of fracturing parameters for coalbed methane  horizontal wells under complex flow mechanism

doi:10.3969/j.issn.1672-7703.2019.06.015

Abstract

Abstract: Flow models are established based on gas desorption and gas-water two-phase flow characteristics to optimize fracturing parameters for horizontal wells under different coal seam conditions. The PEBI grid and finite volume method are used to solve the problems. According to the permeability and thickness of coal seams, coal reservoirs are divided into four types and corresponding mechanism models are established. Then, cumulative gas production and pressure fields are simulated with different fracturing parameters. The study shows that coal seam properties greatly affect the productivity of horizontal wells with multiple stages fracturing. By analyzing the relationship between fracturing parameters and cumulative gas production with different coal seam properties, optimal horizontal section lengths, fracture half-lengths, and fracture spacing can be obtained under simulated conditions. For thick coal seams, it is recommended that the length of the horizontal section could be 1300 m, the fracture spacing of 75100 m, and the fracture half-length of 60 m. For thin and permeable coal seams, it is recommended that the length of the horizontal section could be above 1500 m, the fracture spacing of 75 m, and the fracture half-length could be as long as possible. For coal seams with poor properties, multi-stage fracturing stimulation will not be recommended.

CLC Number:

Zhu Weiping, Zhen Huaibin, Liu Yuewu, Zhang Tianxiang, Gao Dapeng, Sun Wei, He Dongqin. Study on optimization of fracturing parameters for coalbed methane horizontal wells under complex flow mechanism[J]. China Petroleum Exploration, 2019, 24(6): 822-830.

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Study on optimization of fracturing parameters for coalbed methane horizontal wells under complex flow mechanism

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