Laboratory Experiment on Coalbed-Methane Desorption Influenced by Water Injection and Temperature

2011 ◽  
Vol 50 (7/8) ◽  
pp. 24-33 ◽  
Author(s):  
Dong Zhao ◽  
Yangsheng Zhao ◽  
Zengchao Feng
Keyword(s):  
Laboratory Experiment ◽  
Coalbed Methane ◽  
Water Injection ◽  
Methane Desorption

Microwave irradiation’s effect on promoting coalbed methane desorption and analysis of desorption kinetics

Fuel ◽  
2018 ◽  
Vol 222 ◽  
pp. 56-63 ◽  
Author(s):  
Zhijun Wang ◽  
Xiaotong Ma ◽  
Jianping Wei ◽  
Ning Li
Keyword(s):  
Coalbed Methane ◽  
Desorption Kinetics ◽  
Methane Desorption

Staged Coalbed Methane Desorption and the Contribution of Each Stage to Productivity

2014 ◽  
Vol 50 (4) ◽  
pp. 344-353
Author(s):  
Feiying Ma ◽  
Yongqing Wang ◽  
Haitao Li ◽  
Lin Wang ◽  
Hui Wang ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Methane Desorption

Prevention of Nanoscale Fines in Open-Hole Horizontal Coalbed Methane Wells During the Drainage Process

2021 ◽  
Vol 21 (1) ◽  
pp. 578-583
Author(s):  
Chunhua Guo ◽  
Yu Yang ◽  
Hansen Sun ◽  
Wangang Chen ◽  
Ping Yan ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Shear Failure ◽  
Model Parameters ◽  
Stress Model ◽  
Prediction Theory ◽  
Open Hole ◽  
Methane Desorption ◽  
Nanoscale Range ◽  
Coal Fines

Because coal is quite weak compared with conventional sandstone, shear failure downhole will produce a large amount of nanoscale coal fines during the drainage process. Since the size of pores in coal is on the nanoscale range, these fines will sometimes cause serious damage problems downhole. The origin of coal fines cannot be explained by conventional sand prediction theory, which was previously designed for conventional sandstone. During the drainage process, the in situ stress change in coal was caused by the combination of the poroelastic effect, methane desorption and compression around the borehole. To prevent nanoscale coal fines, the critical pressure drawdown can be predicted by the comprehensive stress model. A special test was also designed to determine the key model parameters, making the model easy to use. It was proven that the induced stress due to methane desorption can exaggerate the shear failure, which is different from conventional sand prediction theory. Based on the stress model, the safe window of bottom hole pressure was applied for open-hole horizontal wells to prevent the origin of nanoscale coal fines.

scholarly journals Erratum to: Staged Coalbed Methane Desorption and the Contribution of Each Stage to Productivity

2014 ◽  
Vol 50 (5) ◽  
pp. 448-448
Author(s):  
Feiying Ma ◽  
Yongqing Wang ◽  
Haitao Li ◽  
Lin Wang ◽  
Hui Wang ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Methane Desorption

scholarly journals Experimental Study on Methane Desorption from Lumpy Coal under the Action of Hydraulic and Thermal

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Dong Zhao ◽  
Dayuan Li ◽  
Yulin Ma ◽  
Zengchao Feng ◽  
Yangsheng Zhao
Keyword(s):  
Gas Flow ◽  
Water Pressure ◽  
Water Injection ◽  
Steam Injection ◽  
Gas Desorption ◽  
Pressure Water ◽  
Methane Desorption ◽  
Cbm Production ◽  
Injection Technology ◽  
Desorption Capacity

Moisture and thermal are the key factors for influencing methane desorption during CBM exploitation. Using high-pressure water injection technology into coalbed, new fractures and pathways are formed to transport methane. A phenomenon of water-inhibiting gas flow existed. This study is focused on various water pressures impacted on gas-adsorbed coal samples, and then the desorption capacity could be revealed under different conditions. And the results are shown that methane desorption capacity was decreased with the increase in water pressure at room temperature and the downtrend would be steady until water pressure was large enough. Heating could promote gas desorption capacity effectively, with the increasing of water injection pressures, and the promotion of thermal on desorption became more obvious. These results are expected to provide a clearer understanding of theoretical efficiency of heat water or steam injection into coalbed, and they can provide some theoretical and experimental guidance on CBM production and methane control.

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