scholarly journals Experimental study on the microscopic characteristics affecting methane adsorption on anthracite coal treated with high-voltage electrical pulses

2017 ◽  
Vol 36 (1-2) ◽  
pp. 170-181 ◽  
Author(s):  
Chuan-jie Zhu ◽  
Ximiao Lu ◽  
Bai-quan Lin ◽  
Fa-zhi Yan ◽  
Chang Guo ◽  
...  
Keyword(s):  
High Voltage ◽  
Coalbed Methane ◽  
Gas Adsorption ◽  
Gas Permeability ◽  
Electrical Pulse ◽  
Gas Migration ◽  
Methane Recovery ◽  
Enhanced Coalbed Methane Recovery ◽  
Anthracite Coal ◽  
Electrical Pulses

The low gas permeability of coal formations with limited coal pores and fractures leads to difficulty in coalbed methane exploration. High-voltage electrical pulse has a potential application in enhanced coalbed methane recovery. In this study, we discuss the microscopic characteristics of anthracite coals treated by high-voltage electrical pulse. We find that C, O, and other coal elements constituting oxygenic groups, which mainly account for gas adsorption, decreased slightly after high-voltage electrical pulse treatment, indicating that elemental variation may have little influence on gas adsorption. The scanning electron microscopy and low-pressure nitrogen gas adsorption (LP-N2GA) results show that the cumulative micropore volumes of high-voltage electrical pulse-treated coals were much larger than those of original coals. The mercury intrusion porosimetry results show that the cumulative macropore volumes, which act as gas migration channels in coal increased. Additionally, high-voltage electrical pulse-treated coals were found to have smaller entrapment areas, indicating that gas migration was enhanced.

Petrophysical variation of coal treated by cyclic high-voltage electrical pulse for coalbed methane recovery

2019 ◽  
Vol 178 ◽  
pp. 795-804 ◽  
Author(s):  
Xiangliang Zhang ◽  
Baiquan Lin ◽  
Chuanjie Zhu ◽  
Fazhi Yan ◽  
Ting Liu ◽  
...  
Keyword(s):  
High Voltage ◽  
Coalbed Methane ◽  
Electrical Pulse ◽  
Methane Recovery

scholarly journals Influence and Sensitivity Study of Matrix Shrinkage and Swelling on Enhanced Coalbed Methane Production and CO2 Sequestration with Mixed Gas Injection

2011 ◽  
Vol 29 (6) ◽  
pp. 759-775 ◽  
Author(s):  
Fengde Zhou ◽  
Guangqing Yao ◽  
Zhonghua Tang ◽  
Oyinkepreye D. Orodu
Keyword(s):  
Methane Production ◽  
Coalbed Methane ◽  
Net Present Value ◽  
Sensitivity Study ◽  
Mixed Gas ◽  
Methane Recovery ◽  
Matrix Shrinkage ◽  
Enhanced Coalbed Methane Recovery ◽  
Shrinkage And Swelling ◽  
Enhanced Coalbed Methane

Matrix compressibility, shrinkage and swelling can cause profound changes in porosity and permeability of coalbed during gas sorption and desorption. These factors affect the distribution of pressure, methane production and CO2 sequestration. This paper compares the effects of cleat compression and matrix shrinkage and swelling models with the injection of different compositional gas mixtures (CO2 and N2). It shows that well performance, pressure distribution and properties of the seam are strongly affected by matrix shrinkage and swelling. Matrix shrinkage and swelling also affects net present value of the enhanced coalbed methane recovery scheme. In order to select the best enhanced coalbed methane recovery schemes, economic evaluation and sensitivity studies are necessary.

Thermo-hydro-mechanical-chemical couplings controlling CH4 production and CO2 sequestration in enhanced coalbed methane recovery

Energy ◽  
2019 ◽  
Vol 173 ◽  
pp. 1054-1077 ◽  
Author(s):  
Chaojun Fan ◽  
Derek Elsworth ◽  
Sheng Li ◽  
Lijun Zhou ◽  
Zhenhua Yang ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Co2 Sequestration ◽  
Methane Recovery ◽  
Enhanced Coalbed Methane Recovery ◽  
Ch4 Production ◽  
Enhanced Coalbed Methane
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