Results 191 to 200 of about 20,003 (223)
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An experimental study of coal-fines migration in Coalbed-methane production wells
Journal of Natural Gas Science and Engineering, 2015Abstract Coalbed Methane (CBM) has become an important gas resource in the last several decades. The brittle property of coal matrix and overflushing operation make the migration of coal fines inevitable. As the liquid flows below a critical velocity, the coal-fines accumulate in the bottomhole.
Guoqing Han +5 more
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Enrichment and migration regularity of fine coal particles in enhanced gravity concentrator
International Journal of Mineral Processing, 2017Abstract Enrichment and migration regularity of coal particles in compound force field provided by Falcon concentrator were studied. Influence of centrifugal force and fluidization water pressure on the distribution rates and ash contents of materials that enriched in overflow, top separation area and bottom separation area were tested respectively ...
Xiang-nan Zhu +3 more
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Advanced Powder Technology, 2020
Abstract The vibrated dense medium fluidized bed is an efficient waterless dry coal separation technology. In order to reduce the interference of the macroscopic migration of the entire bed with the coal settlement process, the material composition and diffusion behavior of the binary medium are studied.
Enhui Zhou +6 more
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Abstract The vibrated dense medium fluidized bed is an efficient waterless dry coal separation technology. In order to reduce the interference of the macroscopic migration of the entire bed with the coal settlement process, the material composition and diffusion behavior of the binary medium are studied.
Enhui Zhou +6 more
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Fuel, 2021
Abstract Coal gasification fine slag is a kind of industrial waste produced from coal gasification process, and high-moisture coal gasification fine slag filter cake has brought challenges to environment and coal energy suatainable development.
Fanhui Guo +8 more
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Abstract Coal gasification fine slag is a kind of industrial waste produced from coal gasification process, and high-moisture coal gasification fine slag filter cake has brought challenges to environment and coal energy suatainable development.
Fanhui Guo +8 more
openaire +1 more source
Energy & Fuels, 2014
Drilling through coal beds and high initial fluid production rates can lead to shear and compressive failure of coal, resulting in the creation of coal fines. In overbalanced drilling, these fines mix with the drilling fluid and are carried into the near-wellbore zone. During initial water production, the fines are transported to the producing wellbore
Massarotto, Paul +3 more
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Drilling through coal beds and high initial fluid production rates can lead to shear and compressive failure of coal, resulting in the creation of coal fines. In overbalanced drilling, these fines mix with the drilling fluid and are carried into the near-wellbore zone. During initial water production, the fines are transported to the producing wellbore
Massarotto, Paul +3 more
openaire +2 more sources
Journal of Natural Gas Science and Engineering, 2016
Abstract This study presents a systematic experimental methodology to investigate permeability damage caused by fines migration. The workflow starts with a thorough characterization of a bituminous coal sample by the XRD, SEM-EDX, petrographic, proximate and ultimate methods.
Zhenghuai Guo +2 more
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Abstract This study presents a systematic experimental methodology to investigate permeability damage caused by fines migration. The workflow starts with a thorough characterization of a bituminous coal sample by the XRD, SEM-EDX, petrographic, proximate and ultimate methods.
Zhenghuai Guo +2 more
openaire +1 more source
International Journal of Coal Geology, 2018
Abstract Both fines migration and creep can damage coal permeability during coal seam gas production. This study investigates the individual and coupled effect of fines migration and creep on coal permeability. We perform three types of flow experiments on coal samples: (1) water flow with both fines migration and creep, (2) gas flow with creep and ...
Zhenghuai Guo +2 more
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Abstract Both fines migration and creep can damage coal permeability during coal seam gas production. This study investigates the individual and coupled effect of fines migration and creep on coal permeability. We perform three types of flow experiments on coal samples: (1) water flow with both fines migration and creep, (2) gas flow with creep and ...
Zhenghuai Guo +2 more
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Fuel, 2017
Abstract Long-term pore pressure depletion significantly alters reservoir stresses, which are known to have a substantial impact on permeability in fractured reservoirs. Increased effective stresses resulting from depletion often induce a decrease in permeability.
Igor Shovkun, D. Nicolas Espinoza
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Abstract Long-term pore pressure depletion significantly alters reservoir stresses, which are known to have a substantial impact on permeability in fractured reservoirs. Increased effective stresses resulting from depletion often induce a decrease in permeability.
Igor Shovkun, D. Nicolas Espinoza
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Physics of Fluids
The migration, deposition, and retention of coal fines carried by drainage fluids in gas production wells of coalbed methane (CBM) wells severely restrict CBM production. This study establishes a numerical model to investigate the coupled gas–liquid–coal fines seepage law in the horizontal wellbore annulus during gas production stage using a ...
Xitu Zhang +4 more
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The migration, deposition, and retention of coal fines carried by drainage fluids in gas production wells of coalbed methane (CBM) wells severely restrict CBM production. This study establishes a numerical model to investigate the coupled gas–liquid–coal fines seepage law in the horizontal wellbore annulus during gas production stage using a ...
Xitu Zhang +4 more
openaire +1 more source
Experimental Investigation on Coal Fines Migration: Proppant Conductivity Studies
SSRN Electronic Journal, 2022Faisal Awan +4 more
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