The Experts below are selected from a list of 7095 Experts worldwide ranked by ideXlab platform
Jeffrey N Johnson - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of the environmental impact of hydraulic fracturing of tight shale gas Reservoirs on near surface groundwater background base cases shallow Reservoirs short term gas and water transport
Water Resources Research, 2015Co-Authors: Matthew T Reagan, George J Moridis, Noel Keen, Jeffrey N JohnsonAbstract:Hydrocarbon production from unconventional resources and the use of Reservoir Stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that Reservoir Stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated Reservoir with shallower freshwater aquifers, thus resulting in the contamination of potable groundwater by escaping hydrocarbons or other Reservoir fluids. This study investigates, by numerical simulation, gas and water transport between a shallow tight-gas Reservoir and a shallower overlying freshwater aquifer following hydraulic fracturing operations, if such a connecting pathway has been created. We focus on two general failure scenarios: (1) communication between the Reservoir and aquifer via a connecting fracture or fault and (2) communication via a deteriorated, preexisting nearby well. We conclude that the key factors driving short-term transport of gas include high permeability for the connecting pathway and the overall volume of the connecting feature. Production from the Reservoir is likely to mitigate release through reduction of available free gas and lowering of Reservoir pressure, and not producing may increase the potential for release. We also find that hydrostatic tight-gas Reservoirs are unlikely to act as a continuing source of migrating gas, as gas contained within the newly formed hydraulic fracture is the primary source for potential contamination. Such incidents of gas escape are likely to be limited in duration and scope for hydrostatic Reservoirs. Reliable field and laboratory data must be acquired to constrain the factors and determine the likelihood of these outcomes.Short-term leakage fractured Reservoirs requires high-permeability pathways Production strategy affects the likelihood and magnitude of gas release Gas release is likely short-term, without additional driving forces.
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numerical simulation of the environmental impact of hydraulic fracturing of tight shale gas Reservoirs on near surface groundwater background base cases shallow Reservoirs short term gas and water transport
Water Resources Research, 2015Co-Authors: Matthew T Reagan, George J Moridis, Noel Keen, Jeffrey N JohnsonAbstract:Hydrocarbon production from unconventional resources and the use of Reservoir Stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that Reservoir Stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated Reservoir with shallower freshwater aquifers, thus resulting in the contamination of potable groundwater by escaping hydrocarbons or other Reservoir fluids. This study investigates, by numerical simulation, gas and water transport between a shallow tight-gas Reservoir and a shallower overlying freshwater aquifer following hydraulic fracturing operations, if such a connecting pathway has been created. We focus on two general failure scenarios: (1) communication between the Reservoir and aquifer via a connecting fracture or fault and (2) communication via a deteriorated, preexisting nearby well. We conclude that the key factors driving short-term transport of gas include high permeability for the connecting pathway and the overall volume of the connecting feature. Production from the Reservoir is likely to mitigate release through reduction of available free gas and lowering of Reservoir pressure, and not producing may increase the potential for release. We also find that hydrostatic tight-gas Reservoirs are unlikely to act as a continuing source of migrating gas, as gas contained within the newly formed hydraulic fracture is the primary source for potential contamination. Such incidents of gas escape are likely to be limited in duration and scope for hydrostatic Reservoirs. Reliable field and laboratory data must be acquired to constrain the factors and determine the likelihood of these outcomes.
Matthew T Reagan - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of the environmental impact of hydraulic fracturing of tight shale gas Reservoirs on near surface groundwater background base cases shallow Reservoirs short term gas and water transport
Water Resources Research, 2015Co-Authors: Matthew T Reagan, George J Moridis, Noel Keen, Jeffrey N JohnsonAbstract:Hydrocarbon production from unconventional resources and the use of Reservoir Stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that Reservoir Stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated Reservoir with shallower freshwater aquifers, thus resulting in the contamination of potable groundwater by escaping hydrocarbons or other Reservoir fluids. This study investigates, by numerical simulation, gas and water transport between a shallow tight-gas Reservoir and a shallower overlying freshwater aquifer following hydraulic fracturing operations, if such a connecting pathway has been created. We focus on two general failure scenarios: (1) communication between the Reservoir and aquifer via a connecting fracture or fault and (2) communication via a deteriorated, preexisting nearby well. We conclude that the key factors driving short-term transport of gas include high permeability for the connecting pathway and the overall volume of the connecting feature. Production from the Reservoir is likely to mitigate release through reduction of available free gas and lowering of Reservoir pressure, and not producing may increase the potential for release. We also find that hydrostatic tight-gas Reservoirs are unlikely to act as a continuing source of migrating gas, as gas contained within the newly formed hydraulic fracture is the primary source for potential contamination. Such incidents of gas escape are likely to be limited in duration and scope for hydrostatic Reservoirs. Reliable field and laboratory data must be acquired to constrain the factors and determine the likelihood of these outcomes.Short-term leakage fractured Reservoirs requires high-permeability pathways Production strategy affects the likelihood and magnitude of gas release Gas release is likely short-term, without additional driving forces.
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numerical simulation of the environmental impact of hydraulic fracturing of tight shale gas Reservoirs on near surface groundwater background base cases shallow Reservoirs short term gas and water transport
Water Resources Research, 2015Co-Authors: Matthew T Reagan, George J Moridis, Noel Keen, Jeffrey N JohnsonAbstract:Hydrocarbon production from unconventional resources and the use of Reservoir Stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that Reservoir Stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated Reservoir with shallower freshwater aquifers, thus resulting in the contamination of potable groundwater by escaping hydrocarbons or other Reservoir fluids. This study investigates, by numerical simulation, gas and water transport between a shallow tight-gas Reservoir and a shallower overlying freshwater aquifer following hydraulic fracturing operations, if such a connecting pathway has been created. We focus on two general failure scenarios: (1) communication between the Reservoir and aquifer via a connecting fracture or fault and (2) communication via a deteriorated, preexisting nearby well. We conclude that the key factors driving short-term transport of gas include high permeability for the connecting pathway and the overall volume of the connecting feature. Production from the Reservoir is likely to mitigate release through reduction of available free gas and lowering of Reservoir pressure, and not producing may increase the potential for release. We also find that hydrostatic tight-gas Reservoirs are unlikely to act as a continuing source of migrating gas, as gas contained within the newly formed hydraulic fracture is the primary source for potential contamination. Such incidents of gas escape are likely to be limited in duration and scope for hydrostatic Reservoirs. Reliable field and laboratory data must be acquired to constrain the factors and determine the likelihood of these outcomes.
Wei Zhang - One of the best experts on this subject based on the ideXlab platform.
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performance of enhanced geothermal system egs in fractured geothermal Reservoirs with co2 as working fluid
Applied Thermal Engineering, 2019Co-Authors: Facheng Gong, Xiaozhi Wang, Zhanqing Qu, Wei ZhangAbstract:Abstract Creating an open, connected fracture by hydraulic Stimulation is vital to heat mining in an enhanced geothermal system (EGS). The existence of natural fractures, which seriously affects the development pattern, can complicate the hydraulic fractures. Different fracture propagation patterns of hydraulic fracturing can be achieved through different fracturing processes under certain natural fracture scales. Besides, CO2 has attracted a lot of attention as working fluid because of its superior hydrothermal properties and CO2 geological storage. At present, the study of EGS for fractured geothermal Reservoirs with CO2 as working fluid is quite limited. In this paper, we firstly presented a three-dimensional (3D) thermal–hydraulic-mechanical (THM) coupled model to analyze performance of EGS in fractured geothermal Reservoirs with different natural fractures scales, Reservoir Stimulation scales, and working fluids (water and CO2), aimed to guide Reservoir Stimulation and fracture parameter design. The results are showed as follows: If not forming connected fractures, the existence of natural fractures would cause fluid loss, an increase in natural fracture density by 0.4%, and the heat extraction rate decreases 0.06 MW on average; Forming connected fractures in the foundation of natural fractures would increase the output flow rate, so the Reservoir Stimulation scale increases by 0.85% and the heat extraction rate increases 0.2 MW; CO2 has better heat extraction properties than water due to its lower viscosity, greatly improving the production efficiency. Combining the hydraulic fracture conductivity tests creatively, the sensitivity analysis of fracturing parameters is studied. The heat extraction rate decreases with the increase in fracture aperture and fracture permeability. Under certain closure pressure (40 MPa in this paper), the best ceramsite proppant concentration and proppant size are 5 kg/m2 and 100 mesh, respectively, and the corresponding fracture conductivity is 1.6 μm2•cm.
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performance of enhanced geothermal system egs in fractured geothermal Reservoirs with co2 as working fluid
Applied Thermal Engineering, 2019Co-Authors: Tiankui Guo, Facheng Gong, Xiaozhi Wang, Qiang Lin, Wei ZhangAbstract:Abstract Creating an open, connected fracture by hydraulic Stimulation is vital to heat mining in an enhanced geothermal system (EGS). The existence of natural fractures, which seriously affects the development pattern, can complicate the hydraulic fractures. Different fracture propagation patterns of hydraulic fracturing can be achieved through different fracturing processes under certain natural fracture scales. Besides, CO2 has attracted a lot of attention as working fluid because of its superior hydrothermal properties and CO2 geological storage. At present, the study of EGS for fractured geothermal Reservoirs with CO2 as working fluid is quite limited. In this paper, we firstly presented a three-dimensional (3D) thermal–hydraulic-mechanical (THM) coupled model to analyze performance of EGS in fractured geothermal Reservoirs with different natural fractures scales, Reservoir Stimulation scales, and working fluids (water and CO2), aimed to guide Reservoir Stimulation and fracture parameter design. The results are showed as follows: If not forming connected fractures, the existence of natural fractures would cause fluid loss, an increase in natural fracture density by 0.4%, and the heat extraction rate decreases 0.06 MW on average; Forming connected fractures in the foundation of natural fractures would increase the output flow rate, so the Reservoir Stimulation scale increases by 0.85% and the heat extraction rate increases 0.2 MW; CO2 has better heat extraction properties than water due to its lower viscosity, greatly improving the production efficiency. Combining the hydraulic fracture conductivity tests creatively, the sensitivity analysis of fracturing parameters is studied. The heat extraction rate decreases with the increase in fracture aperture and fracture permeability. Under certain closure pressure (40 MPa in this paper), the best ceramsite proppant concentration and proppant size are 5 kg/m2 and 100 mesh, respectively, and the corresponding fracture conductivity is 1.6 μm2•cm.
George J Moridis - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of the environmental impact of hydraulic fracturing of tight shale gas Reservoirs on near surface groundwater background base cases shallow Reservoirs short term gas and water transport
Water Resources Research, 2015Co-Authors: Matthew T Reagan, George J Moridis, Noel Keen, Jeffrey N JohnsonAbstract:Hydrocarbon production from unconventional resources and the use of Reservoir Stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that Reservoir Stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated Reservoir with shallower freshwater aquifers, thus resulting in the contamination of potable groundwater by escaping hydrocarbons or other Reservoir fluids. This study investigates, by numerical simulation, gas and water transport between a shallow tight-gas Reservoir and a shallower overlying freshwater aquifer following hydraulic fracturing operations, if such a connecting pathway has been created. We focus on two general failure scenarios: (1) communication between the Reservoir and aquifer via a connecting fracture or fault and (2) communication via a deteriorated, preexisting nearby well. We conclude that the key factors driving short-term transport of gas include high permeability for the connecting pathway and the overall volume of the connecting feature. Production from the Reservoir is likely to mitigate release through reduction of available free gas and lowering of Reservoir pressure, and not producing may increase the potential for release. We also find that hydrostatic tight-gas Reservoirs are unlikely to act as a continuing source of migrating gas, as gas contained within the newly formed hydraulic fracture is the primary source for potential contamination. Such incidents of gas escape are likely to be limited in duration and scope for hydrostatic Reservoirs. Reliable field and laboratory data must be acquired to constrain the factors and determine the likelihood of these outcomes.Short-term leakage fractured Reservoirs requires high-permeability pathways Production strategy affects the likelihood and magnitude of gas release Gas release is likely short-term, without additional driving forces.
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numerical simulation of the environmental impact of hydraulic fracturing of tight shale gas Reservoirs on near surface groundwater background base cases shallow Reservoirs short term gas and water transport
Water Resources Research, 2015Co-Authors: Matthew T Reagan, George J Moridis, Noel Keen, Jeffrey N JohnsonAbstract:Hydrocarbon production from unconventional resources and the use of Reservoir Stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that Reservoir Stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated Reservoir with shallower freshwater aquifers, thus resulting in the contamination of potable groundwater by escaping hydrocarbons or other Reservoir fluids. This study investigates, by numerical simulation, gas and water transport between a shallow tight-gas Reservoir and a shallower overlying freshwater aquifer following hydraulic fracturing operations, if such a connecting pathway has been created. We focus on two general failure scenarios: (1) communication between the Reservoir and aquifer via a connecting fracture or fault and (2) communication via a deteriorated, preexisting nearby well. We conclude that the key factors driving short-term transport of gas include high permeability for the connecting pathway and the overall volume of the connecting feature. Production from the Reservoir is likely to mitigate release through reduction of available free gas and lowering of Reservoir pressure, and not producing may increase the potential for release. We also find that hydrostatic tight-gas Reservoirs are unlikely to act as a continuing source of migrating gas, as gas contained within the newly formed hydraulic fracture is the primary source for potential contamination. Such incidents of gas escape are likely to be limited in duration and scope for hydrostatic Reservoirs. Reliable field and laboratory data must be acquired to constrain the factors and determine the likelihood of these outcomes.
Noel Keen - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of the environmental impact of hydraulic fracturing of tight shale gas Reservoirs on near surface groundwater background base cases shallow Reservoirs short term gas and water transport
Water Resources Research, 2015Co-Authors: Matthew T Reagan, George J Moridis, Noel Keen, Jeffrey N JohnsonAbstract:Hydrocarbon production from unconventional resources and the use of Reservoir Stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that Reservoir Stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated Reservoir with shallower freshwater aquifers, thus resulting in the contamination of potable groundwater by escaping hydrocarbons or other Reservoir fluids. This study investigates, by numerical simulation, gas and water transport between a shallow tight-gas Reservoir and a shallower overlying freshwater aquifer following hydraulic fracturing operations, if such a connecting pathway has been created. We focus on two general failure scenarios: (1) communication between the Reservoir and aquifer via a connecting fracture or fault and (2) communication via a deteriorated, preexisting nearby well. We conclude that the key factors driving short-term transport of gas include high permeability for the connecting pathway and the overall volume of the connecting feature. Production from the Reservoir is likely to mitigate release through reduction of available free gas and lowering of Reservoir pressure, and not producing may increase the potential for release. We also find that hydrostatic tight-gas Reservoirs are unlikely to act as a continuing source of migrating gas, as gas contained within the newly formed hydraulic fracture is the primary source for potential contamination. Such incidents of gas escape are likely to be limited in duration and scope for hydrostatic Reservoirs. Reliable field and laboratory data must be acquired to constrain the factors and determine the likelihood of these outcomes.Short-term leakage fractured Reservoirs requires high-permeability pathways Production strategy affects the likelihood and magnitude of gas release Gas release is likely short-term, without additional driving forces.
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numerical simulation of the environmental impact of hydraulic fracturing of tight shale gas Reservoirs on near surface groundwater background base cases shallow Reservoirs short term gas and water transport
Water Resources Research, 2015Co-Authors: Matthew T Reagan, George J Moridis, Noel Keen, Jeffrey N JohnsonAbstract:Hydrocarbon production from unconventional resources and the use of Reservoir Stimulation techniques, such as hydraulic fracturing, has grown explosively over the last decade. However, concerns have arisen that Reservoir Stimulation creates significant environmental threats through the creation of permeable pathways connecting the stimulated Reservoir with shallower freshwater aquifers, thus resulting in the contamination of potable groundwater by escaping hydrocarbons or other Reservoir fluids. This study investigates, by numerical simulation, gas and water transport between a shallow tight-gas Reservoir and a shallower overlying freshwater aquifer following hydraulic fracturing operations, if such a connecting pathway has been created. We focus on two general failure scenarios: (1) communication between the Reservoir and aquifer via a connecting fracture or fault and (2) communication via a deteriorated, preexisting nearby well. We conclude that the key factors driving short-term transport of gas include high permeability for the connecting pathway and the overall volume of the connecting feature. Production from the Reservoir is likely to mitigate release through reduction of available free gas and lowering of Reservoir pressure, and not producing may increase the potential for release. We also find that hydrostatic tight-gas Reservoirs are unlikely to act as a continuing source of migrating gas, as gas contained within the newly formed hydraulic fracture is the primary source for potential contamination. Such incidents of gas escape are likely to be limited in duration and scope for hydrostatic Reservoirs. Reliable field and laboratory data must be acquired to constrain the factors and determine the likelihood of these outcomes.