A micro-macro coupled permeability model for gas transport in coalbed methane reservoirs

Sun, Fengrui; Liu, Dameng; Cai, Yidong; Qiu, Yongkai

doi:10.1016/j.energy.2023.128604

Cited by 8 publications

(1 citation statement)

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“…Permeability is an important parameter for coalbed methane (CBM) desorption, migration, and production, and the permeability of coal reservoirs is affected by the reservoir pressure changed during its whole tectonic-burial evolution [1]. Desorbed gas transport in coal is generally recognized as having two transport mechanisms in dual porosity media, i.e., diffusion in the coal matrix and subsequent laminar or non-laminar flow in the cleat system [2][3][4]. A series of experimental and theoretical studies about coal permeability and its evolution have been carried out in academia [5].…”

Section: Introductionmentioning

confidence: 99%

Permeability Evolution of Bituminous Coal and Its Dynamic Control, a Case Study from the Southeastern Ordos Basin, China

Qiu,

Chang,

Sun

et al. 2023

Energies

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Coalbed methane (CBM) reservoirs’ permeability is the result of dynamic variations influenced by tectonics, hydrology and the CBM production process. Taking samples from the southeastern Ordos Basin, China, the permeability evolution of bituminous coal and its control were analyzed in three steps: (1) the coal fracture permeability evolution was acquired via X-ray CT scanning and permeability evolution experiments; (2) the permeability variation was determined while considering the coupling characteristics effective stress, gas slippage, and matrix shrinkage effect and its influencing factors; and (3) a dynamic permeability model was built while considering those effects. For samples in which neither fractures nor bedding developed, the permeability decreased first and then increased as the gas pressure increased. For samples with fractures that developed parallel to the axial direction, with a gradual increase in gas pressure, the permeability also increased. As the gas pressure decreased, the matrix shrinkage effect became positive, resulting in a permeability increase. The gas slippage effect was positive in the low-pressure stage, which also resulted in a permeability increase.

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