Experimental study on enhancing coal-bed methane production by wettability alteration to gas wetness

Lin, Junxin; Li, Kewen; Yan, Zhiming; Wang, Yongwei; Mahlalela, Bhekumuzi Mgijimi

doi:10.1016/j.fuel.2019.115860

Cited by 23 publications

(13 citation statements)

References 34 publications

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“…Although reciprocating MICP is secondary drainage method, the influence of the residual saturation formed at the first mercury intrusion on the results is ignored. Jia et al (2019) found that capillary pressure decreased by changing the wettability of coal samples from water-wet to strong gas-wet to improve fluid microscopic flow characteristics, thus coalbed methane recovery was significantly enhanced. Hussien et al (2019) proposed methods to reduce Table 2.…”

Section: Improvement Of Experimental Measurementmentioning

confidence: 99%

“…Fractal geometry gave a new method for describing complex and irregular structures (Mandelbrot, 1982). The macro-heterogeneity and micro-pore structures of the pore space have been proven to have fractal characteristics (Mandelbrot, 1982;Krohn, 1988;He and Hua, 1998;Xie et al, 2010;Lai and Wang, 2015;Hao et al, 2017), so it is a preferred method to describe the pore structure characteristics of reservoirs using fractal dimension calculated from MICP curves data (Friesen and Mikula, 1987;Angulo et al, 1992;Shen and Li, 1994;Li, 2010;Yang et al, 2016;Su et al, 2018;Li et al, 2019;Guo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Applications of mercury intrusion capillary pressure for pore structures: A review

et al. 2020

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Section: Improvement Of Experimental Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Applications of mercury intrusion capillary pressure for pore structures: A review

et al. 2020

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“…Since Li and Firoozabadi 18,19 successfully used GWA technology to alter the wettability of Berea sandstones, many studies have been conducted on improving natural gas production using this technology 20‐27 . In the application of coal, Jia et al 28,29 conducted the experimental study and underground field test by using GWA technology for a better gas drainage in coal mines and found a favorable effect. However, the general drainage rate of each fracturing borehole with GWA treatment is not high as no proppant was pumped into the fractures.…”

Section: Introductionmentioning

confidence: 99%

“…The advantages of using elongated coal gangue as proppant in coal seam were discussed. The field test results were analyzed and compared with the authors' previous underground test 29 and experimental data 28 …”

Section: Introductionmentioning

confidence: 99%

Refracturing field tests for enhanced coalbed methane production with gas wettability alteration

Lin

Zhao

et al. 2021

Int J Energy Res

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Summary Gas wettability alteration (GWA) technology has been used for better methane drainage underground. Our previous field tests of underground fracturing demonstrated a large increase in coalbed methane (CBM) production compared with those in the boreholes fractured without GWA treatments. However, the general drainage rate of each fracturing borehole with GWA treatment is not high enough because no proppant was used in the underground fracturing. To this end, field tests of surface refracturing in two CBM wells (Wells A‐2 and 4) were conducted with an innovative fracturing measure with GWA treatments and elongated coal‐like proppants in XJ coal mine, Yangquan, China. The water and CBM production with the novel and the conventional fracturing technologies were compared and analyzed. The field test results showed that the CBM production with the novel refracturing technologies (29 697 and 26 844 m3 for Wells XJ‐2 and 4) is greater than those with conventional refracturing (22 746 m3 for Well XJ‐6) and initial‐fracturing (25 297.4 and 2847.2 m3 for Wells XJ‐2 and 4). The significant increase in CBM production demonstrates that the novel fracturing technology could be applied for enhanced CBM production.

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“…Generally speaking, the plasticity is enhanced, and the resistance to outburst risks is improved overall [11][12][13]. However, it is considered that residual water in the pores will block the gas migration channels after water injections, which will have certain impacts on the gas release rates [14][15][16]. It is also considered that the inhibition effects on gas desorption of water may be due to the fact that the capillary force reduction effects caused by the amplification of pore channels by pressure water is generally smaller than the capillary force increase effects caused by the original pore scales [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Study of the Solid-Liquid-Gas Three-Phase Coupling Relationship of Coal, Water and Gas

Yuan

Huang²,

Hou

et al. 2020

Geofluids

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At the present time, it is of major significance to study the solid-liquid-gas three-phase coupling relationship of coal, water, and gas in deep-mining stopes in order to prevent and control coal and gas outbursts in high-gas mines. In this study, the influence rules of water on the mechanical characteristics of coal, as well as gas diffusion and migration processes, was examined by combining theoretical analysis and laboratory testing procedures. The results showed that with increases in water content, the mechanical characteristics of coal bodies presented change trends of first increasing and then decreasing. In this study, it was found that the water content levels which corresponded to the maximum shear strength of the coal in the No. 8 coal seam in the study area had ranged between 6.77% and 11.9%, and the water content level corresponding to the extreme point was 8.66%. It was observed that under different water content conditions, the gas desorption speeds of the coal bodies gradually decreased over time. The gas desorption speeds rapidly decreased during the initial desorption stage and then gradually decreased over time. Furthermore, under the different water content conditions, the amount of gas desorption in the coal bodies was observed to gradually increase over time, with the initial desorption amounts displaying rapid increases. Then, with the passage of time, the increase speeds of the gas desorption amount gradually decreased and finally tended to remain at a stable value. It was found that with the increases in water content, the desorption speeds, initial desorption speeds, and desorption amount of gas in the coal bodies continuously decreased. In other words, the water content levels in the coal bodies were negatively correlated with the gas desorption speeds and desorption amounts of the coal bodies. In addition, the gas desorption speeds, initial desorption speeds, and desorption amounts were observed to change more sharply with the increases in water content. The results of this research hold important guiding significance for the improvement of the understanding of the mechanical properties of high-gas coal seams and the implementation of effective gas control measures.

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Experimental study on enhancing coal-bed methane production by wettability alteration to gas wetness

Cited by 23 publications

References 34 publications

Applications of mercury intrusion capillary pressure for pore structures: A review

Applications of mercury intrusion capillary pressure for pore structures: A review

Refracturing field tests for enhanced coalbed methane production with gas wettability alteration

A Study of the Solid-Liquid-Gas Three-Phase Coupling Relationship of Coal, Water and Gas

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