water injection coal
Blasting-enhanced water injection for coal and gas out ...
2020-8-1 · Water injection also has the potential to influence gas emission rates via the following mechanisms: (1) water enters the coal pore structure under capillary force and replaces the adsorption gas in the pores, and, (2) a water blocking effect occurs in coal after imbibition, reducing the gas desorption speed, and effectively preventing coal and ...
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Law of water migration inside the water-injected coal base ...
1. Introduction. Coal water injection is an important technical means to improve the recovery rate of coal–gas combined mining wells .The effect of water injection is affected by the internal structure of coal, and industrial CT is an important technical means to
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Effect of the water injection pressure on coal ...
2021-10-26 · Coal seam water injection is a commonly used method by which to improve coal seam permeability. To reveal how this method can enhance coal permeability from the perspective of the pore-fracture structure, the permeability and porosity of raw coal samples under different water injection pressures were tested.
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Research and practice on fluctuation water injection ...
2012-4-1 · 1. Introduction. Coal seam water infusion is an important technical means aimed at preventing various disasters. The application of the coal seam water infusion can reduce the yield of dust capacity effectively in broking the coal and prevent from rock-burst and coal and gas outburst; through increasing the coefficient of thermal conductivity of the coal, and reducing
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Effect of cyclic water injection on the wettability of ...
1. Introduction. Coal is the important source of energy for many countries .Coal and gas outburst is one of the most damaging hazards in coal mines , , , .Coal seam water injection refers to the injection of water into the coal seam fractures under a certain pressure through the infiltration and wetting effect of water, which can soften the coal seam, reduce elastic energy, delay gas ...
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Synthesis and characterization of water injection ...
2022-2-1 · Because the coal bodies of most coal mines in China have the problems of hard coal quality, fewer original holes and fissures, poor hydrophilicity, etc., it is difficult to inject water into most coal mines.15, 16, 17 It is also difficult to reduce the critical pressure, increase the wetting radius of water injection, expand the water injection ...
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Water Injection in Longwall Top-coal Caving Face in China
2020-11-4 · Table 2. The approximate proper water injection zone. l(m) soft coal middle-hard coal hard coal beginning of 26~30 22~25 18~20 water injection stopping of 6~10 4~6 2~4 water injection Note: !-the distance ahead of face The Proper Bolehole Distribution In China, parallel boleholes are used widely for water
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Deep-hole water injection technology of strong impact ...
2018-1-10 · The implementation of coal-seam water injection can change the physical and mechanical properties of coal, can improve the coal storage limit, prevent and control rock burst, prevent coal and gas outburst, and reduce dust concentration in underground operations. However, there are still many shortcomings such as the poor sealing effect and the lack of
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Water Injection into Coal Seam and Its Implication on Dust ...
Water Injection into Coal Seam and Its Implication on Dust Control. 煤炭视听 > Water Injection into Coal Seam and Its Implication on Dust Control.
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Improvement of wettability of coal seams in water ...
Water injection into coal seams is important for dust prevention in mines. However, owing to the hydrophobicity of coal itself, the wetting effect of water injection on coal seams has yet to be enhanced. Herein, based on the hydrophobicity of coal, hydrophilic modification of the coal surface has been proposed via co-deposition of polydopamine ...
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Effect of the water injection pressure on coal ...
2021-10-26 · Coal seam water injection is a commonly used method by which to improve coal seam permeability. To reveal how this method can enhance coal permeability from the perspective of the pore-fracture structure, the permeability and porosity of raw coal samples under different water injection pressures were tested.
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Effect of the water injection pressure on coal ...
Coal seam water injection is a commonly used method by which to improve coal seam permeability. To reveal how this method can enhance coal permeability from the perspective of the pore‐fracture ...
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Blasting-enhanced water injection for coal and gas out ...
Coal seam water injection is proved an effective method for preventing coal and gas outburst. However, the poor wettability of coal seam has resulted in poor effect of
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Water injection methods in coal bed based on experiments ...
Water injection in coal seam under high pressure has been widely applied in the outburst prevention practice (Junfeng et al. 2012; Chengdong et al. 2014), the integrity of the coal mass is
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Deep-hole water injection technology of strong impact ...
2018-1-10 · The implementation of coal-seam water injection can change the physical and mechanical properties of coal, can improve the coal storage limit, prevent and control rock burst, prevent coal and gas outburst, and reduce dust concentration in underground operations. However, there are still many shortcomings such as the poor sealing effect and the lack of
Read More
Water Injection in Longwall Top-coal Caving Face in China
2020-11-4 · Table 2. The approximate proper water injection zone. l(m) soft coal middle-hard coal hard coal beginning of 26~30 22~25 18~20 water injection stopping of 6~10 4~6 2~4 water injection Note: !-the distance ahead of face The Proper Bolehole Distribution In China, parallel boleholes are used widely for water
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Energies | Free Full-Text | Time Effect of Water Injection ...
Coal seam water injection can change the bursting liability of coal or rock and reduce or eliminate rockburst disasters in the mining field. It is characterized by a simple operation process, small investment and other favorable features [].At present, it is widely used to prevent and control rockburst disasters in China [16,17].The bursting liability of coal seams is closely related to
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Numerical Simulation of Combined Water Injection in
2017-8-9 · When a coal seam is injected with pressurized water, it can be opened by the water pressure seepage, and then channels will be formed and saturated with water in the seam. Cheng et al. (2012, 2013) investigated the microscopic process of water injection in coal seams, and determined the main influencing factors of coal seam water injection.
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A NEW FRACTAL MODEL OF COAL PERMEABILITY BASED
2021-11-30 · The permeability of coal seams directly determines the disaster prevention effect of water injection. It is of great significance to realize the accurate fractal expression of coal structure and construct a fractal permeability model for elucidating the dynamic evolution law of the permeability of coal during and after water injection.
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Can water from coal seam gas be re-injected into the ...
2021-12-20 · The World Economic Forum is an independent international organization committed to improving the state of the world by engaging business, political, academic and other leaders of society to shape global, regional and
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Effect of the water injection pressure on coal ...
Coal seam water injection is a commonly used method by which to improve coal seam permeability. To reveal how this method can enhance coal permeability from the perspective of the pore‐fracture ...
Read More
Blasting-enhanced water injection for coal and gas out ...
Coal seam water injection is proved an effective method for preventing coal and gas outburst. However, the poor wettability of coal seam has resulted in poor effect of
Read More
Water Injection in Longwall Top-coal Caving Face in China
2020-11-4 · Table 2. The approximate proper water injection zone. l(m) soft coal middle-hard coal hard coal beginning of 26~30 22~25 18~20 water injection stopping of 6~10 4~6 2~4 water injection Note: !-the distance ahead of face The Proper Bolehole Distribution In China, parallel boleholes are used widely for water
Read More
Water Injection into Coal Seam and Its Implication on Dust ...
Water Injection into Coal Seam and Its Implication on Dust Control. 煤炭视听 > Water Injection into Coal Seam and Its Implication on Dust Control.
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Energies | Free Full-Text | Time Effect of Water Injection ...
Coal seam water injection can change the bursting liability of coal or rock and reduce or eliminate rockburst disasters in the mining field. It is characterized by a simple operation process, small investment and other favorable features [].At present, it is widely used to prevent and control rockburst disasters in China [16,17].The bursting liability of coal seams is closely related to
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Coal seam water infusion for dust control: a technical review
Coal mine dust continues to be a health and safety issue in underground coal mines. Coal seam water infusion was developed and widely applied in European coal mines for dust control, and was also a common practice in most Chinese coal mines. This method typically involves the infusion of water into
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Can water from coal seam gas be re-injected
2021-12-20 · The World Economic Forum is an independent international organization committed to improving the state of the world by engaging business, political, academic and other leaders of society to shape global, regional and
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Permeability Loss of Bituminous Coal Induced by Water
2022-1-21 · Assuming that K c is constant during mercury injection, the coal matrix volume can be corrected using the following equation (Shao et al., 2018) (A-5) where V c(P i) is the coal matrix volume at a mercury injection pressure of P i, cm 3 /g and P 0 is the initial injection pressure and is equal to 0.0035 MPa.
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Water injection hole packer for coal seam ZF-II-Empire ...
VI. Instructions and Precautions 1. Water injection hole packer for coal seam ZF-II is easy to use. Once the packer is connected to site water supply system and completely inserted into the borehole, driven by pressure, the packer expands to realize packing effect and water may be injected to crack the coal seam.
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Synthesis and characterization of water injection fracturing ...
2022-1-4 · Synthesis and characterization of water injection fracturing fluid for wetting and softening coal International Journal of Rock Mechanics and Mining Sciences ( IF 7.135) Pub Date : 2022-01-04 Gang Zhou, Cunmin Wang, Rulin Liu, Shuailong Li,
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