The Effects of Wettability and Interfacial Forces on the Depressurisation of Waterflooded Reservoirs

Hawes, R.I.; Dawe, Richard A.; Grattoni, Carlos A.

doi:10.3997/2214-4609.201406771

Cited by 6 publications

(4 citation statements)

References 4 publications

(4 reference statements)

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Section: Introductionmentioning

confidence: 99%

“…Previous researchers have investigated bubble growth and motion based on pore-scale processes and monitoring of individual bubble movement ( − ). While these studies are important to fully understand the physical processes controlling ebullition, they are difficult to upscale due to pore-scale heterogeneity and the possibility of erratic bubble movement ( − ). Other research has focused on the movement of gases in air sparging systems, but these systems use large air-injection rates and are not directly analogous to systems where gases are produced biogenically ( − ).…”

Section: Introductionmentioning

confidence: 99%

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Investigating Ebullition in a Sand Column Using Dissolved Gas Analysis and Reactive Transport Modeling

Amos

Mayer

2006

Environ. Sci. Technol.

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Ebullition of gas bubbles through saturated sediments can enhance the migration of gases through the subsurface, affect the rate of biogeochemical processes, and potentially enhance the emission of important greenhouse gases to the atmosphere. To better understand the parameters controlling ebullition, methanogenic conditions were produced in a column experiment and ebullition through the column was monitored and quantified through dissolved gas analysis and reactive transport modeling. Dissolved gas analysis showed rapid transport of CH4 vertically through the column at rates several times faster than the bromide tracer and the more soluble gas CO2, indicating that ebullition was the main transport mechanism for CH4. An empirically derived formulation describing ebullition was integrated into the reactive transport code MIN3P allowing this process to be investigated on the REV scale in a complex geochemical framework. The simulations provided insights into the parameters controlling ebullition and show that, over the duration of the experiment, 36% of the CH4 and 19% of the CO2 produced were transported to the top of the column through ebullition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating Ebullition in a Sand Column Using Dissolved Gas Analysis and Reactive Transport Modeling

Amos

Mayer

2006

Environ. Sci. Technol.

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“…There appear to be fewer laboratory studies of the depressurization of waterflooded oil, and critical gas saturations in the range 0.03 to 0.27 have been observed. [6][7][8][9][10] This parameter is believed to be reservoirspecific and dependent upon the depressurization rate.…”

Section: Introductionmentioning

confidence: 99%

Relative Permeability Measurements for Post-Waterflood Depressurization of the Miller Field, North Sea

Naylor

Fishlock

Mogford

et al. 2001

SPE Reservoir Evaluation &Amp; Engineering

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This paper describes a determination of critical gas saturations and relative permeabilities relevant to the depressurization of the Miller field. A series of reservoir-condition coreflood experiments and associated numerical simulations is described. Three experiments were conducted with aged Miller core and fluids at 120°C. Each was comprised of a waterflood at about 414 barg, followed by depressurization at different rates. The laboratory data included extensive three-phase in-situ saturation measurements that were used to derive gas relative permeabilities through the simulations.The rate-dependent critical gas saturations varied between 0.06 and 0.21, and gas relative permeabilities of the order of 0.0001 were deduced. These laboratory results are consistent with published data and suggest that conventional Corey-type gas relative permeabilities are an order of magnitude too large and do not represent the depressurization process.

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“…There appear to be less laboratory studies of the depressurisation of waterflooded oil and critical gas saturations in the range 0.03-0.27 have been observed 6,7,8,9,10 . This parameter is believed to be reservoir specific and dependent upon the: !…”

Section: Introductionmentioning

confidence: 99%

Relative Permeability Measurements for Post-Waterflood Depressurisation of the Miller Field, North Sea

Naylor

Fishlock

Mogford

et al. 2000

SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper describes a determination of critical gas saturations and relative permeabilities relevant to the depressurisation of the Miller field. A series of reservoir condition coreflood experiments and associated numerical simulations is described. Three experiments were conducted with aged Miller core and fluids at 120°C and each comprised of a waterflood at about 414 barg, followed by depressurisation at different rates. The laboratory data included extensive threephase in-situ saturation measurements which were used to derive gas relative permeabilities through the simulations.The rate dependent critical gas saturations varied between 0.06 and 0.21 and gas relative permeabilities of the order of 0.0001 were deduced. These laboratory results are consistent with published data and demonstrate that conventional Coreytype gas relative permeabilities are an order of magnitude too large and do not represent the depressurisation process.This paper is believed to be the first publication of:1. A reservoir condition study of the depressurisation of aged, waterflooded cores. 2. Extensive, reservoir condition, three-phase in-situ saturation measurements which enable critical gas saturations and gas relative permeabilities to be determined. 3. A slow depressurisation experiment with a duration of 141 days.Mobilisation of gas in Miller has been found to have a significant impact on oil production profiles and project economics, and the data from this study can be used to reduce the risk associated with depressurisation.

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The Effects of Wettability and Interfacial Forces on the Depressurisation of Waterflooded Reservoirs

Cited by 6 publications

References 4 publications

Investigating Ebullition in a Sand Column Using Dissolved Gas Analysis and Reactive Transport Modeling

Investigating Ebullition in a Sand Column Using Dissolved Gas Analysis and Reactive Transport Modeling

Relative Permeability Measurements for Post-Waterflood Depressurization of the Miller Field, North Sea

Relative Permeability Measurements for Post-Waterflood Depressurisation of the Miller Field, North Sea

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