Experimental work on methane recovery at the lenin mine of the Karaganda Basin

Slastunov, S.V.; Prezent, G. M.; Kolikov, K. S.

doi:10.1007/bf02562514

Cited by 3 publications

(1 citation statement)

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“…Thermal stimulation to deep CBM reservoirs is an effective method to promote gas recovery. Researchers have explored many different basic theories and mining technologies [6][7][8][9][10]. Before the production of methane, water with high temperature of 80 • C is assumed to be injected into a hypothetical CBM reservoir to causes helpful coal-gas interactions [11].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling and Simulation on the Stimulation Interactions in Coalbed Methane Thermal Recovery

Teng

Wang

et al. 2019

Processes

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Heat stimulation of coalbed methane (CBM) reservoirs has remarkable promotion to gas desorption that enhances gas recovery. However, coalbed deformation, methane delivery and heat transport interplay each other during the stimulation process. This paper experimentally validated the evolutions of gas sorption and coal permeability under variable temperature. Then, a completely coupled heat-gas-coal model was theoretically developed and applied to a computational simulation of CBM thermal recovery based on a finite element approach of COMSOL with MATLAB. Modeling and simulation results show that: Although different heat-gas-coal interactions have different effects on CBM recovery, thermal stimulation of coalbed can promote methane production effectively. However, CBM thermal recovery needs a forerunner heating time before the apparent enhancement of production. The modeling and simulation results may improve the current cognitions of CBM thermal recovery.Processes 2019, 7, 526 2 of 16 that the reservoir temperature increases 30 • C in twelve years to finally expand the methane production by 58% compared to the conventional method of direct recovery. Li et al.[12] established a mathematical model before demonstrating the complicated couplings among coalbed, methane and temperature. The model was then applied to a CBM thermal recovery of microwave heating. Research results show that thermal stimulation with microwave expands methane recovery more than 40% due to the deformation induced by gas sorption. Khoshnevis et al. [13] investigated the synergy type of gas production by injecting geothermal water. They established a three-dimension model to discuss the production potential of gas field and the influences of injection rate, reservoir permeability, saturation condition on the ultimate methane production. Lu [14] proposed a numerical simulation of heat injection into a three-dimensional temperature field by ANSYS to evidence the increasing production of CBM with temperature due to the easier desorption with higher temperature. Shahtalebi et al. [15] point out that the costs in coalbed methane thermal production limit the economic effectiveness. Only when the price of natural gas is comparatively higher and the demand for clean energy is stronger, the method of thermal production can become an economically attractive option.CBM thermal recovery benefits a lot from the enhanced gas adsorption behavior [16][17][18]. Sakurovs et al. [19] presented three sets of experimental sorption evolutions at variable temperature. The results show that the methane adsorption capacity has great dependency with coal temperature. The sorption of coal to methane at different temperature ranges may indicate different behaviors, and a traditional Langmuir equation cannot describe the different trends. For example, Guan et al. [20,21] estimated the adsorption isotherms at temperatures from 283 K to 343 K. They find that the adsorption capacity of CBM decreases linearly with increasing temperature at the range of 283 K to 323 K, and keeps...

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