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Papers by Denis Pone

Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions.... more Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions. However, considerable effort remains to shift this technology from its current status as potential solution to a safe, effective and trusted foundation to the global energy system. Characterization of gas movement and sorption capacity of coal at in-situ conditions is required. Using the volumetric method, measurements of CH4 and CO2 sorption and diffusion in coal have been made on powder and non-powder confined coal. Evaluation of sorption capacity and transport rates of gases in coal structure under replicated in-situ conditions is essential. Although crushed coal provides useful information for coal structure characterization, underground storage take place within compact coal monoliths. There is evidence that overburden stresses affects swelling and impacts gas movement in coal. This paper focuses primarily on the characterization of coal-gas system dynamic behavior during carbon dioxide sorption at replicated in-situ conditions. It includes the quantification of the effect of confining stress on sorption capacity and transport rates and its variation with time in coal at constant effective stress. Carbon dioxide sorption rates are evaluated for 1000 psi (6.9 MPa) and 2000 psi (13.8 MPa) confining stress. Information collected from the same coal, but unconfined and crushed allows comparison. Gas evolution curves are evaluated by a developed mathematical model and diffusion constants are extracted. Sorption and transport rates obtained can be used in reservoirs simulators of enhanced coalbed methane recovery and carbon dioxide sequestration in unmineable coal seams.

All Days, 2009

Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions.... more Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions. However, considerable effort remains to shift this technology from its current status as potential solution to a safe, effective and trusted foundation to the global energy system. Characterization of gas movement and sorption capacity of coal at in-situ conditions is required. Using the volumetric method, measurements of CH4 and CO2 sorption and diffusion in coal have been made on powder and non-powder confined coal. Evaluation of sorption capacity and transport rates of gases in coal structure under replicated in-situ conditions is essential. Although crushed coal provides useful information for coal structure characterization, underground storage take place within compact coal monoliths. There is evidence that overburden stresses affects swelling and impacts gas movement in coal. This paper focuses primarily on the characterization of coal-gas system dynamic behavior during carbon di...

International Journal of Coal Geology, Jun 1, 2010

Sequestration of carbon dioxide in unmineable coal seams is an option to combat climate change an... more Sequestration of carbon dioxide in unmineable coal seams is an option to combat climate change and an opportunity to enhance coalbed methane production. Prediction of sequestration potential in coal requires characterization of porosity, permeability, sorption capacity and the magnitude of swelling due to carbon dioxide uptake or shrinkage due to methane and water loss. Unfortunately, the majority of data characterizing

Fuel Processing Technology, 2011

Drying of low-rank coals affects: coal cleaning, combustion, comminution, gasification, liquefact... more Drying of low-rank coals affects: coal cleaning, combustion, comminution, gasification, liquefaction, and inseam fluid-flow (water, coalbed methane, and carbon dioxide for sequestration/enhanced coalbed methane). To evaluate the extent of drying-induced transitions, 3 lump-sized (approximately 6 × 2 × 2 cm) Powder River Basin subbituminous coal samples were thermally dried in an air-drying coal oven at 50°C over two weeks. A high-resolution industrial X-ray computed tomography scanner was utilized to generate (nondestructively) three-dimensional regional volumetric renderings, as-received and over 3-stages of drying. The lumps had cleats, both open and mineral filled, with a degree of fracture diversity along the longitudinal plane. Comparison of the virtual slice surfaces, at identifiable locations, allowed the induced cracking and shrinkage accompanying the transitions during 19% moisture loss to almost dry to be observed. Under these drying conditions, the heat transfer, and thus extent of drying, proceeded radially inward. With increased drying time the fractures extend and become larger in aperture as the coal shrinks. The major fractures mostly followed the existing cleat system. With additional drying, these cleats widened and the aperture increase propagated deeper into the coal extended into the butt cleats. New fractures were located mostly perpendicular to the cleat fracture surface. The external volume of the coal lumps had limited shrinkage. The axial extent of the shrinkage length (lump edge to lump edge) was on the order of 4-6%, the bulk of the shrinkage being accommodated by the internal shrinkage between cleats.

International Journal of Coal Geology, 2009

Sequestration of carbon dioxide in unmineable coal seams is an option to reduce carbon dioxide em... more Sequestration of carbon dioxide in unmineable coal seams is an option to reduce carbon dioxide emissions. It is well known that the interaction of carbon dioxide with unconfined coal induces swelling. This paper contributes three-dimensional strain distribution in confined coal at microstructural level using high-resolution X-ray computerized tomography data and image analysis. Swelling and compression/compaction of regions in the coal

Energy Procedia, Feb 1, 2009

Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions.... more Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions. However, considerable effort remains to shift this technology from its current status as potential solution to a safe, effective and trusted foundation to the global energy system. Characterization of gas movement and sorption capacity of coal at in-situ conditions is required. Using the volumetric method, measurements of CH 4 and CO 2 sorption and diffusion in coal have been made on powder and non-powder confined coal. Results obtained, emphasized that the sorption capacity and the kinetics of gas in coal are both influenced by the stress state of the sample. The application of 6.9 MPa confining stress contributed to about 30% and 80% of sorption capacity reduction for CO 2 and CH 4 respectively. The sorption and diffusion of CO 2 in confined coal follow two distinct rates described with diffusion coefficients of 2.3 x 10-6 m 2 /s and 9.4 x 10-12 m 2 /s respectively. In contrast, the flow of methane is characterized by a continuous process with a diffusion coefficient of 3.8 x 10-7 m 2 /s. These observations confirms the complex interaction of CO 2 with the coal structure and stressed that CH 4 and CO 2 sorption and transport in coal should be characterized differently, specifically when dealing with non-powder confined samples. Consequently, the use of information collected on pulverized coal samples for the simulation and prediction of long term underground sequestration and enhanced coalbed methane is not justified.

Journal of Petroleum Science and Engineering, Sep 1, 2015

Proppants are often utilized during hydraulic fracturing to aid the retention of the fracture ape... more Proppants are often utilized during hydraulic fracturing to aid the retention of the fracture aperture. However, for coal the permeability enhancement may be mitigated due to proppant embedment within the natural/artificial fractures of coalbed methane reservoirs. This process may become increasingly complex if CO 2 is injected in the reservoir for enhanced recovery. The reduction in effective fracture aperture occurs under the influence of overburden stress either when CO 2-induced coal softening causes proppant penetration into the coal fracture surface or coal swelling encroaches into the propped facture. Here permeability transformations at simulated in situ conditions were evaluated through a suite of laboratory experiments conducted on split-cores of high-rank coals. A single smooth-surface saw-cut fracture was created and the permeability evolution measured for both non-sorbing (He) and sorbing (CO 2) gases at constant applied confining stress of 10 MPa. Permeability was also measured for the idealized case of a uniform monolayer of #70-140 mesh quartz sand proppant sand introduced within the saw-cut fracture for coal. The increase in He permeability was as high as $ 10 fold over the unpropped fracture for a monolayer of proppant sandwiched within the coal. A similar increase in permeability with the addition of proppant was observed in the case of sorptive gas (CO 2) for coal. For He there was an exponential increase in permeability with increasing gas pressure (p¼1-6 MPa) for coal without proppant, as expected, as the effective stress on the core was reduced. However, with CO 2 the permeability decreased in the 1-4 MPa pressure range due to either coal swelling or softening or their combination but increased above 4 MPa due to reduced effective stress. Optical profilometry pre-and post-exposure was used to quantify any surface deformation due to proppant embedment. Comparison of the fracture surface before and after showed only infrequent new isolated pits, similar to the size of the proppant grains. The slight increase in surface roughness following exposure to CO 2 was presumed due to irreversible rearrangement of the coal structure due to CO 2 uptake then loss. A mechanistic model explains the evolution of permeability in a propped artificial fracture due to interaction with a sorbing gas (CO 2). Permeability evolves with a characteristic "U-shaped" trend with increasing gas pressure at constant confining stresspermeability reduces to a minimum at approximately double the Langmuir pressure flanked by elevated permeabilities at either low sorptive states (low p) or at low effective stress (high p). An excellent fit is recovered between model and experimental observations.

29th Annual International Pittsburgh Coal Conference 2012, PCC 2012, Dec 1, 2012

Journal of Petroleum Science and Engineering, 2015

Proppants are often utilized during hydraulic fracturing to aid the retention of the fracture ape... more Proppants are often utilized during hydraulic fracturing to aid the retention of the fracture aperture. However, for coal the permeability enhancement may be mitigated due to proppant embedment within the natural/artificial fractures of coalbed methane reservoirs. This process may become increasingly complex if CO 2 is injected in the reservoir for enhanced recovery. The reduction in effective fracture aperture occurs under the influence of overburden stress either when CO 2-induced coal softening causes proppant penetration into the coal fracture surface or coal swelling encroaches into the propped facture. Here permeability transformations at simulated in situ conditions were evaluated through a suite of laboratory experiments conducted on split-cores of high-rank coals. A single smooth-surface saw-cut fracture was created and the permeability evolution measured for both non-sorbing (He) and sorbing (CO 2) gases at constant applied confining stress of 10 MPa. Permeability was also measured for the idealized case of a uniform monolayer of #70-140 mesh quartz sand proppant sand introduced within the saw-cut fracture for coal. The increase in He permeability was as high as $ 10 fold over the unpropped fracture for a monolayer of proppant sandwiched within the coal. A similar increase in permeability with the addition of proppant was observed in the case of sorptive gas (CO 2) for coal. For He there was an exponential increase in permeability with increasing gas pressure (p¼1-6 MPa) for coal without proppant, as expected, as the effective stress on the core was reduced. However, with CO 2 the permeability decreased in the 1-4 MPa pressure range due to either coal swelling or softening or their combination but increased above 4 MPa due to reduced effective stress. Optical profilometry pre-and post-exposure was used to quantify any surface deformation due to proppant embedment. Comparison of the fracture surface before and after showed only infrequent new isolated pits, similar to the size of the proppant grains. The slight increase in surface roughness following exposure to CO 2 was presumed due to irreversible rearrangement of the coal structure due to CO 2 uptake then loss. A mechanistic model explains the evolution of permeability in a propped artificial fracture due to interaction with a sorbing gas (CO 2). Permeability evolves with a characteristic "U-shaped" trend with increasing gas pressure at constant confining stresspermeability reduces to a minimum at approximately double the Langmuir pressure flanked by elevated permeabilities at either low sorptive states (low p) or at low effective stress (high p). An excellent fit is recovered between model and experimental observations.

CO2 Storage in Carboniferous Formations and Abandoned Coal Mines, 2011

Energy Procedia, 2009

Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions.... more Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions. However, considerable effort remains to shift this technology from its current status as potential solution to a safe, effective and trusted foundation to the global energy system. Characterization of gas movement and sorption capacity of coal at in-situ conditions is required. Using the volumetric method, measurements of CH 4 and CO 2 sorption and diffusion in coal have been made on powder and non-powder confined coal. Results obtained, emphasized that the sorption capacity and the kinetics of gas in coal are both influenced by the stress state of the sample. The application of 6.9 MPa confining stress contributed to about 30% and 80% of sorption capacity reduction for CO 2 and CH 4 respectively. The sorption and diffusion of CO 2 in confined coal follow two distinct rates described with diffusion coefficients of 2.3 x 10-6 m 2 /s and 9.4 x 10-12 m 2 /s respectively. In contrast, the flow of methane is characterized by a continuous process with a diffusion coefficient of 3.8 x 10-7 m 2 /s. These observations confirms the complex interaction of CO 2 with the coal structure and stressed that CH 4 and CO 2 sorption and transport in coal should be characterized differently, specifically when dealing with non-powder confined samples. Consequently, the use of information collected on pulverized coal samples for the simulation and prediction of long term underground sequestration and enhanced coalbed methane is not justified.

GSA Field Guide 6: Interior Western United States, 2005

... City, Utah 84114, USA Paul B. Anderson Consulting Geologist, 807 East South Temple,# 101, Sal... more ... City, Utah 84114, USA Paul B. Anderson Consulting Geologist, 807 East South Temple,# 101, Salt ... tural features thought to be genetically related to the San Rafael uplift (Tripp, 1989; Burns ... Emery coalfield in Emery and Carbon counties one of the most profitable gas fields in ...

Fuel, 2014

h i g h l i g h t s The recovery is rapid at higher CO 2 injection pressures. However, CO 2 break... more h i g h l i g h t s The recovery is rapid at higher CO 2 injection pressures. However, CO 2 breakthrough occurs earlier at higher injection pressures. The homogenizing influence of CO 2-swelling is outpaced by CH 4-shrinkage. This leaves the reservoir open to short-circuiting and earlier breakthrough. The cumulative CO 2 produced and stored is proportional to the injection pressure.

International Journal of Greenhouse Gas Control, 2012

This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright

International Journal of Coal Geology, 2011

This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright

Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions.... more Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions. However, considerable effort remains to shift this technology from its current status as potential solution to a safe, effective and trusted foundation to the global energy system. Characterization of gas movement and sorption capacity of coal at in-situ conditions is required. Using the volumetric method, measurements of CH4 and CO2 sorption and diffusion in coal have been made on powder and non-powder confined coal. Evaluation of sorption capacity and transport rates of gases in coal structure under replicated in-situ conditions is essential. Although crushed coal provides useful information for coal structure characterization, underground storage take place within compact coal monoliths. There is evidence that overburden stresses affects swelling and impacts gas movement in coal. This paper focuses primarily on the characterization of coal-gas system dynamic behavior during carbon dioxide sorption at replicated in-situ conditions. It includes the quantification of the effect of confining stress on sorption capacity and transport rates and its variation with time in coal at constant effective stress. Carbon dioxide sorption rates are evaluated for 1000 psi (6.9 MPa) and 2000 psi (13.8 MPa) confining stress. Information collected from the same coal, but unconfined and crushed allows comparison. Gas evolution curves are evaluated by a developed mathematical model and diffusion constants are extracted. Sorption and transport rates obtained can be used in reservoirs simulators of enhanced coalbed methane recovery and carbon dioxide sequestration in unmineable coal seams.

All Days, 2009

Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions.... more Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions. However, considerable effort remains to shift this technology from its current status as potential solution to a safe, effective and trusted foundation to the global energy system. Characterization of gas movement and sorption capacity of coal at in-situ conditions is required. Using the volumetric method, measurements of CH4 and CO2 sorption and diffusion in coal have been made on powder and non-powder confined coal. Evaluation of sorption capacity and transport rates of gases in coal structure under replicated in-situ conditions is essential. Although crushed coal provides useful information for coal structure characterization, underground storage take place within compact coal monoliths. There is evidence that overburden stresses affects swelling and impacts gas movement in coal. This paper focuses primarily on the characterization of coal-gas system dynamic behavior during carbon di...

International Journal of Coal Geology, Jun 1, 2010

Sequestration of carbon dioxide in unmineable coal seams is an option to combat climate change an... more Sequestration of carbon dioxide in unmineable coal seams is an option to combat climate change and an opportunity to enhance coalbed methane production. Prediction of sequestration potential in coal requires characterization of porosity, permeability, sorption capacity and the magnitude of swelling due to carbon dioxide uptake or shrinkage due to methane and water loss. Unfortunately, the majority of data characterizing

Fuel Processing Technology, 2011

Drying of low-rank coals affects: coal cleaning, combustion, comminution, gasification, liquefact... more Drying of low-rank coals affects: coal cleaning, combustion, comminution, gasification, liquefaction, and inseam fluid-flow (water, coalbed methane, and carbon dioxide for sequestration/enhanced coalbed methane). To evaluate the extent of drying-induced transitions, 3 lump-sized (approximately 6 × 2 × 2 cm) Powder River Basin subbituminous coal samples were thermally dried in an air-drying coal oven at 50°C over two weeks. A high-resolution industrial X-ray computed tomography scanner was utilized to generate (nondestructively) three-dimensional regional volumetric renderings, as-received and over 3-stages of drying. The lumps had cleats, both open and mineral filled, with a degree of fracture diversity along the longitudinal plane. Comparison of the virtual slice surfaces, at identifiable locations, allowed the induced cracking and shrinkage accompanying the transitions during 19% moisture loss to almost dry to be observed. Under these drying conditions, the heat transfer, and thus extent of drying, proceeded radially inward. With increased drying time the fractures extend and become larger in aperture as the coal shrinks. The major fractures mostly followed the existing cleat system. With additional drying, these cleats widened and the aperture increase propagated deeper into the coal extended into the butt cleats. New fractures were located mostly perpendicular to the cleat fracture surface. The external volume of the coal lumps had limited shrinkage. The axial extent of the shrinkage length (lump edge to lump edge) was on the order of 4-6%, the bulk of the shrinkage being accommodated by the internal shrinkage between cleats.

International Journal of Coal Geology, 2009

Sequestration of carbon dioxide in unmineable coal seams is an option to reduce carbon dioxide em... more Sequestration of carbon dioxide in unmineable coal seams is an option to reduce carbon dioxide emissions. It is well known that the interaction of carbon dioxide with unconfined coal induces swelling. This paper contributes three-dimensional strain distribution in confined coal at microstructural level using high-resolution X-ray computerized tomography data and image analysis. Swelling and compression/compaction of regions in the coal

Energy Procedia, Feb 1, 2009

Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions.... more Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions. However, considerable effort remains to shift this technology from its current status as potential solution to a safe, effective and trusted foundation to the global energy system. Characterization of gas movement and sorption capacity of coal at in-situ conditions is required. Using the volumetric method, measurements of CH 4 and CO 2 sorption and diffusion in coal have been made on powder and non-powder confined coal. Results obtained, emphasized that the sorption capacity and the kinetics of gas in coal are both influenced by the stress state of the sample. The application of 6.9 MPa confining stress contributed to about 30% and 80% of sorption capacity reduction for CO 2 and CH 4 respectively. The sorption and diffusion of CO 2 in confined coal follow two distinct rates described with diffusion coefficients of 2.3 x 10-6 m 2 /s and 9.4 x 10-12 m 2 /s respectively. In contrast, the flow of methane is characterized by a continuous process with a diffusion coefficient of 3.8 x 10-7 m 2 /s. These observations confirms the complex interaction of CO 2 with the coal structure and stressed that CH 4 and CO 2 sorption and transport in coal should be characterized differently, specifically when dealing with non-powder confined samples. Consequently, the use of information collected on pulverized coal samples for the simulation and prediction of long term underground sequestration and enhanced coalbed methane is not justified.

Journal of Petroleum Science and Engineering, Sep 1, 2015

Proppants are often utilized during hydraulic fracturing to aid the retention of the fracture ape... more Proppants are often utilized during hydraulic fracturing to aid the retention of the fracture aperture. However, for coal the permeability enhancement may be mitigated due to proppant embedment within the natural/artificial fractures of coalbed methane reservoirs. This process may become increasingly complex if CO 2 is injected in the reservoir for enhanced recovery. The reduction in effective fracture aperture occurs under the influence of overburden stress either when CO 2-induced coal softening causes proppant penetration into the coal fracture surface or coal swelling encroaches into the propped facture. Here permeability transformations at simulated in situ conditions were evaluated through a suite of laboratory experiments conducted on split-cores of high-rank coals. A single smooth-surface saw-cut fracture was created and the permeability evolution measured for both non-sorbing (He) and sorbing (CO 2) gases at constant applied confining stress of 10 MPa. Permeability was also measured for the idealized case of a uniform monolayer of #70-140 mesh quartz sand proppant sand introduced within the saw-cut fracture for coal. The increase in He permeability was as high as $ 10 fold over the unpropped fracture for a monolayer of proppant sandwiched within the coal. A similar increase in permeability with the addition of proppant was observed in the case of sorptive gas (CO 2) for coal. For He there was an exponential increase in permeability with increasing gas pressure (p¼1-6 MPa) for coal without proppant, as expected, as the effective stress on the core was reduced. However, with CO 2 the permeability decreased in the 1-4 MPa pressure range due to either coal swelling or softening or their combination but increased above 4 MPa due to reduced effective stress. Optical profilometry pre-and post-exposure was used to quantify any surface deformation due to proppant embedment. Comparison of the fracture surface before and after showed only infrequent new isolated pits, similar to the size of the proppant grains. The slight increase in surface roughness following exposure to CO 2 was presumed due to irreversible rearrangement of the coal structure due to CO 2 uptake then loss. A mechanistic model explains the evolution of permeability in a propped artificial fracture due to interaction with a sorbing gas (CO 2). Permeability evolves with a characteristic "U-shaped" trend with increasing gas pressure at constant confining stresspermeability reduces to a minimum at approximately double the Langmuir pressure flanked by elevated permeabilities at either low sorptive states (low p) or at low effective stress (high p). An excellent fit is recovered between model and experimental observations.

29th Annual International Pittsburgh Coal Conference 2012, PCC 2012, Dec 1, 2012

Journal of Petroleum Science and Engineering, 2015

Proppants are often utilized during hydraulic fracturing to aid the retention of the fracture ape... more Proppants are often utilized during hydraulic fracturing to aid the retention of the fracture aperture. However, for coal the permeability enhancement may be mitigated due to proppant embedment within the natural/artificial fractures of coalbed methane reservoirs. This process may become increasingly complex if CO 2 is injected in the reservoir for enhanced recovery. The reduction in effective fracture aperture occurs under the influence of overburden stress either when CO 2-induced coal softening causes proppant penetration into the coal fracture surface or coal swelling encroaches into the propped facture. Here permeability transformations at simulated in situ conditions were evaluated through a suite of laboratory experiments conducted on split-cores of high-rank coals. A single smooth-surface saw-cut fracture was created and the permeability evolution measured for both non-sorbing (He) and sorbing (CO 2) gases at constant applied confining stress of 10 MPa. Permeability was also measured for the idealized case of a uniform monolayer of #70-140 mesh quartz sand proppant sand introduced within the saw-cut fracture for coal. The increase in He permeability was as high as $ 10 fold over the unpropped fracture for a monolayer of proppant sandwiched within the coal. A similar increase in permeability with the addition of proppant was observed in the case of sorptive gas (CO 2) for coal. For He there was an exponential increase in permeability with increasing gas pressure (p¼1-6 MPa) for coal without proppant, as expected, as the effective stress on the core was reduced. However, with CO 2 the permeability decreased in the 1-4 MPa pressure range due to either coal swelling or softening or their combination but increased above 4 MPa due to reduced effective stress. Optical profilometry pre-and post-exposure was used to quantify any surface deformation due to proppant embedment. Comparison of the fracture surface before and after showed only infrequent new isolated pits, similar to the size of the proppant grains. The slight increase in surface roughness following exposure to CO 2 was presumed due to irreversible rearrangement of the coal structure due to CO 2 uptake then loss. A mechanistic model explains the evolution of permeability in a propped artificial fracture due to interaction with a sorbing gas (CO 2). Permeability evolves with a characteristic "U-shaped" trend with increasing gas pressure at constant confining stresspermeability reduces to a minimum at approximately double the Langmuir pressure flanked by elevated permeabilities at either low sorptive states (low p) or at low effective stress (high p). An excellent fit is recovered between model and experimental observations.

CO2 Storage in Carboniferous Formations and Abandoned Coal Mines, 2011

Energy Procedia, 2009

Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions.... more Geologic sequestration of carbon dioxide is an option for the mitigation of industrial emissions. However, considerable effort remains to shift this technology from its current status as potential solution to a safe, effective and trusted foundation to the global energy system. Characterization of gas movement and sorption capacity of coal at in-situ conditions is required. Using the volumetric method, measurements of CH 4 and CO 2 sorption and diffusion in coal have been made on powder and non-powder confined coal. Results obtained, emphasized that the sorption capacity and the kinetics of gas in coal are both influenced by the stress state of the sample. The application of 6.9 MPa confining stress contributed to about 30% and 80% of sorption capacity reduction for CO 2 and CH 4 respectively. The sorption and diffusion of CO 2 in confined coal follow two distinct rates described with diffusion coefficients of 2.3 x 10-6 m 2 /s and 9.4 x 10-12 m 2 /s respectively. In contrast, the flow of methane is characterized by a continuous process with a diffusion coefficient of 3.8 x 10-7 m 2 /s. These observations confirms the complex interaction of CO 2 with the coal structure and stressed that CH 4 and CO 2 sorption and transport in coal should be characterized differently, specifically when dealing with non-powder confined samples. Consequently, the use of information collected on pulverized coal samples for the simulation and prediction of long term underground sequestration and enhanced coalbed methane is not justified.

GSA Field Guide 6: Interior Western United States, 2005

... City, Utah 84114, USA Paul B. Anderson Consulting Geologist, 807 East South Temple,# 101, Sal... more ... City, Utah 84114, USA Paul B. Anderson Consulting Geologist, 807 East South Temple,# 101, Salt ... tural features thought to be genetically related to the San Rafael uplift (Tripp, 1989; Burns ... Emery coalfield in Emery and Carbon counties one of the most profitable gas fields in ...

Fuel, 2014

h i g h l i g h t s The recovery is rapid at higher CO 2 injection pressures. However, CO 2 break... more h i g h l i g h t s The recovery is rapid at higher CO 2 injection pressures. However, CO 2 breakthrough occurs earlier at higher injection pressures. The homogenizing influence of CO 2-swelling is outpaced by CH 4-shrinkage. This leaves the reservoir open to short-circuiting and earlier breakthrough. The cumulative CO 2 produced and stored is proportional to the injection pressure.

International Journal of Greenhouse Gas Control, 2012

This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright

International Journal of Coal Geology, 2011

This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright