Abstract
Coalbed methane as one of unconventional natural gases has many advantages in its exploitation and utilization. However, due to the constraints of reservoir characteristics, corresponding stimulation measures must be taken to efficiently recover coalbed methane. Among them, thermal injection stimulation technology is highly expected by domestic and foreign researchers. However, the traditional thermal injection stimulation technology had a series of problems, such as poor stimulation effect and waste of resources. In order to break through the disadvantages of the traditional thermal injection stimulation technology, a new method to use medium enthalpy dry rock geothermal stimulation to increase CBM production—Gth-ECBM system is proposed in this paper. The principle of this system is to take geothermal energy as heat supply and coalbed methane as injection source, which avoids the existing problems in traditional heat injection stimulation technology and achieves better stimulation effect. The construction and operation process of the system is introduced in detail in this paper, its advantages are evaluated, and the heat extraction part of the system is studied by numerical simulation. The simulation results show that the working fluid flows through the cold water injection well into the heat recovery well. In this process, the temperatures in the surrounding rocks of injection well and recovery well both gradually decrease. The fluid temperature in either well began to rise rapidly in the beginning and then decreased along with time going by. After running the modelling, the water temperature at the outlet of the hot water collection well can reach 106 °C, it tells that after 20 years of production, above 80 °C will be remained there and this state can be used as the newly initial condition of enhancedcoalbed methane recovery in the next step. It is preliminarily demonstrated that the geothermal heat extraction part of this system is a feasible engineering.
Article highlights
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The existing CBM heat injection technology mostly uses hot water or hot steam. This method not only wastes ground resources, but also produces ' water lock ' phenomenon in the process of CBM mining, which is not conducive to the production of CBM. In order to solve the disadvantages of traditional heat injection technology, this paper proposes a system-Gth ECBM, which uses low enthalpy dry rock geothermal to increase CBM production.
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The Gth-ECBM system proposed in this paper uses geothermal energy as a heat supply source and groundwater produced in the process of coalbed methane drainage as a heat recovery medium, which greatly saves ground resources and energy. Secondly, the system uses the heated coalbed methane as the heat source to avoid the ‘water lock’ phenomenon, and the yield increase effect is more obvious. Finally, the system integrates heat injection technology and pinnate horizontal well technology, and achieves the effect of double production.
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The heating process of Gth-ECBM system is analyzed by numerical simulation, and the feasibility of the heating process of the system is proved.
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Acknowledgements
The authors thank the support from Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Grant NO. SKLGME021021. This work is as well supported by “the Fundamental Research Funds for the Central Universties”.
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Huang, F., Li, H., Ji, K. et al. A novel system of geothermal enhanced coalbed methane (Gth-ECBM) production: (I) heat extraction modelling. Geomech. Geophys. Geo-energ. Geo-resour. 8, 150 (2022). https://doi.org/10.1007/s40948-022-00458-3
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DOI: https://doi.org/10.1007/s40948-022-00458-3