The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
Curtis M. Oldenburg - One of the best experts on this subject based on the ideXlab platform.
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carbon sequestration in natural gas Reservoirs enhanced gas recovery and natural gas storage
Lawrence Berkeley National Laboratory, 2003Co-Authors: Curtis M. OldenburgAbstract:Natural gas Reservoirs are obvious targets for carbon sequestration by direct carbon dioxide (CO2) injection by virtue of their proven record of gas production and integrity against gas escape. Carbon sequestration in depleted natural gas Reservoirs can be coupled with enhanced gas production by injecting CO2 into the Reservoir as it is being produced, a process called Carbon Sequestration with Enhanced Gas Recovery (CSEGR). In this process, supercritical CO2 is injected deep in the Reservoir while methane (CH4) is produced at wells some distance away. The active injection of CO2 causes repressurization and CH4 displacement to allow the control and enhancement of gas recovery relative to water-Drive or Depletion-Drive Reservoir operations. Carbon dioxide undergoes a large change in density as CO2 gas passes through the critical pressure at temperatures near the critical temperature. This feature makes CO2 a potentially effective cushion gas for gas storage Reservoirs. Thus at the end of the CSEGR process when the Reservoir is filled with CO2, additional benefit of the Reservoir may be obtained through its operation as a natural gas storage Reservoir. In this paper, we present discussion and simulation results from TOUGH2/EOS7C of gas mixture property prediction, gas injection, repressurization, migration, and mixing processes that occur in gas Reservoirs under active CO2 injection.
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Carbon Sequestration in Natural Gas Reservoirs: Enhanced Gas Recovery and
2003Co-Authors: Curtis M. OldenburgAbstract:Natural gas Reservoirs are obvious targets for carbon sequestration by direct carbon dioxide (CO2) injection by virtue of their proven record of gas production and integrity against gas escape. Carbon sequestration in depleted natural gas Reservoirs can be coupled with enhanced gas production by injecting CO2 into the Reservoir as it is being produced, a process called Carbon Sequestration with Enhanced Gas Recovery (CSEGR). In this process, supercritical CO2 is injected deep in the Reservoir while methane (CH4) is produced at wells some distance away. The active injection of CO2 causes repressurization and CH4 displacement to allow the control and enhancement of gas recovery relative to water-Drive or Depletion-Drive Reservoir operations. Carbon dioxide undergoes a large change in density as CO2 gas passes through the critical pressure at temperatures near the critical temperature. This feature makes CO2 a potentially effective cushion gas for gas storage Reservoirs. Thus at the end of the CSEGR process when the Reservoir is filled with CO2, additional benefit of the Reservoir may be obtained through its operation as a natural gas storage Reservoir. In this paper, we present discussion and simulation results from TOUGH2/EOS7C of gas mixture property prediction, gas injection, repressurization, migration, and mixing processes that occur in gas Reservoirs under active CO2 injection
Norway Ntnu / Pera - One of the best experts on this subject based on the ideXlab platform.
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Depletion oil recovery for systems with widely varying initial composition
2005Co-Authors: Kameshwar B Singh, Norway Curtis Whitson H B A Pera, Norway Ntnu / PeraAbstract:Abstract The principal Depletion Drive mechanism is the expansion of oil and gas initially in the Reservoir-neglecting water influx. The main factors in Depletion Drive Reservoir performance are total cumulative compressibility, determined mostly by initial composition (gas-oil ratio), saturation pressure, PVT properties, and relative permeability. In this paper, we systematically study the effect of initial composition on oil recovery, all other parameters held constant. We also evaluate other aspects of Reservoir performance, but the main emphasis is surface oil recovery including condensate. To analyze the effect of initial composition, a series of fluid systems was selected by a recombination of separator samples at varying gas-oil ratios. The systems ranged from low-GOR oils to high-GOR gas condensates, with a continuous transition from gas to oil through a critical mixture. Black oil and compositional material balance calculations, 2D fine-grid, and 3D coarse-grid models have been used to investigate the effect of initial fluid composition on Reservoir Depletion performance. Systematic variation of relative permeabilities was also used to map the range of fluid systems, which were most sensitive to relative permeability. For Reservoir oils, the Depletion recovery of surface oil initially increases with increasing initial gas-oil ratio. Oil recovery reaches a maximum for moderate-GOR oil Reservoirs, followed by decreasing oil recoveries with increasing initial solution GOR. A minimum oil recovery is reached at a near-critical oil. For gas Reservoirs, Depletion Drive condensate recovery increases monotonically from a near-critical gas towards near 100% condensate recovery for veryhigh GOR systems. STO recovery from oil Reservoirs depends increasingly on gas-oil relative permeabilities as initial solution GOR increases, up to a point. At higher initial solution GORs, oil recovery becomes less dependent on relative permeability and, as the fluid system transitions to a gas at the critical point, relative permeability dependence rapidly diminishes. Condensate recovery from www.elsevier.com/locate/petrol gas condensate systems is more or less independent of gas-oil relative permeabilities, with only slight dependence for nearcritical gases.
Kameshwar B Singh - One of the best experts on this subject based on the ideXlab platform.
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Depletion oil recovery for systems with widely varying initial composition
2005Co-Authors: Kameshwar B Singh, Norway Curtis Whitson H B A Pera, Norway Ntnu / PeraAbstract:Abstract The principal Depletion Drive mechanism is the expansion of oil and gas initially in the Reservoir-neglecting water influx. The main factors in Depletion Drive Reservoir performance are total cumulative compressibility, determined mostly by initial composition (gas-oil ratio), saturation pressure, PVT properties, and relative permeability. In this paper, we systematically study the effect of initial composition on oil recovery, all other parameters held constant. We also evaluate other aspects of Reservoir performance, but the main emphasis is surface oil recovery including condensate. To analyze the effect of initial composition, a series of fluid systems was selected by a recombination of separator samples at varying gas-oil ratios. The systems ranged from low-GOR oils to high-GOR gas condensates, with a continuous transition from gas to oil through a critical mixture. Black oil and compositional material balance calculations, 2D fine-grid, and 3D coarse-grid models have been used to investigate the effect of initial fluid composition on Reservoir Depletion performance. Systematic variation of relative permeabilities was also used to map the range of fluid systems, which were most sensitive to relative permeability. For Reservoir oils, the Depletion recovery of surface oil initially increases with increasing initial gas-oil ratio. Oil recovery reaches a maximum for moderate-GOR oil Reservoirs, followed by decreasing oil recoveries with increasing initial solution GOR. A minimum oil recovery is reached at a near-critical oil. For gas Reservoirs, Depletion Drive condensate recovery increases monotonically from a near-critical gas towards near 100% condensate recovery for veryhigh GOR systems. STO recovery from oil Reservoirs depends increasingly on gas-oil relative permeabilities as initial solution GOR increases, up to a point. At higher initial solution GORs, oil recovery becomes less dependent on relative permeability and, as the fluid system transitions to a gas at the critical point, relative permeability dependence rapidly diminishes. Condensate recovery from www.elsevier.com/locate/petrol gas condensate systems is more or less independent of gas-oil relative permeabilities, with only slight dependence for nearcritical gases.
Norway Curtis Whitson H B A Pera - One of the best experts on this subject based on the ideXlab platform.
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Depletion oil recovery for systems with widely varying initial composition
2005Co-Authors: Kameshwar B Singh, Norway Curtis Whitson H B A Pera, Norway Ntnu / PeraAbstract:Abstract The principal Depletion Drive mechanism is the expansion of oil and gas initially in the Reservoir-neglecting water influx. The main factors in Depletion Drive Reservoir performance are total cumulative compressibility, determined mostly by initial composition (gas-oil ratio), saturation pressure, PVT properties, and relative permeability. In this paper, we systematically study the effect of initial composition on oil recovery, all other parameters held constant. We also evaluate other aspects of Reservoir performance, but the main emphasis is surface oil recovery including condensate. To analyze the effect of initial composition, a series of fluid systems was selected by a recombination of separator samples at varying gas-oil ratios. The systems ranged from low-GOR oils to high-GOR gas condensates, with a continuous transition from gas to oil through a critical mixture. Black oil and compositional material balance calculations, 2D fine-grid, and 3D coarse-grid models have been used to investigate the effect of initial fluid composition on Reservoir Depletion performance. Systematic variation of relative permeabilities was also used to map the range of fluid systems, which were most sensitive to relative permeability. For Reservoir oils, the Depletion recovery of surface oil initially increases with increasing initial gas-oil ratio. Oil recovery reaches a maximum for moderate-GOR oil Reservoirs, followed by decreasing oil recoveries with increasing initial solution GOR. A minimum oil recovery is reached at a near-critical oil. For gas Reservoirs, Depletion Drive condensate recovery increases monotonically from a near-critical gas towards near 100% condensate recovery for veryhigh GOR systems. STO recovery from oil Reservoirs depends increasingly on gas-oil relative permeabilities as initial solution GOR increases, up to a point. At higher initial solution GORs, oil recovery becomes less dependent on relative permeability and, as the fluid system transitions to a gas at the critical point, relative permeability dependence rapidly diminishes. Condensate recovery from www.elsevier.com/locate/petrol gas condensate systems is more or less independent of gas-oil relative permeabilities, with only slight dependence for nearcritical gases.