Predicting the Method of Oil Recovery in the Gas-assisted Gravity Drainage Process

Wu, Ke; Li, X.; Wang, X.; Yan, Binpeng; Ren, Min

doi:10.1080/10916466.2011.576372

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…The corrected gravity drainage number N normalG ′ = N normalG ( 1 − cos ⁡ θ ) ( 1 + μ g μ o ) + ρ normalg ρ normalo ( N C + N B ) where N G ’ is the corrected gravity drainage number, N G is the gravity number, N C is the capillary number, N B is the Bond number, ρ g is the gas density, ρ o is the oil density, μ g is the gas viscosity, μ o is the oil viscosity, and θ is the dip angle.…”

Section: Introductionmentioning

confidence: 99%

Establishment of Stability Evaluation Criteria for the Oil–Gas Interface during Gas-Cap Gravity Flooding in Oil Reservoirs with Strong Edge-Water Drive

et al. 2023

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A three-dimensional (3D) experimental model considering the influence of water energy is established to innovatively analyze oil−gas interface stability, and it is found that a stable gas cap with sufficient driving energy can be formed only under a stable oil and gas interface. So, the bidirectional displacement through the gas cap and edge water can be realized during the late development stage in the strong edge-water drive reservoirs. Results show that the recovery of bidirectional displacement can reach 60%, while the recovery of an unstable interface is basically below 50%. The recovery degree under a stable oil−gas interface is more than 25.63% than that of the unstable interface. Based on the Navier−Stokes equation, a "steady flow velocity u s " formula that considers the influence of multiple factors is defined, and the ratio of the flow velocity at the oil−gas interface to the gas injection rate is controlled between 0.6 and 0.85 to determine the criteria for the stable oil−gas interface. At the same time, the differentiationhindered quasi-number (Gr) is defined to clarify the influence mechanism of various mechanical factors on gravity differentiation and the difficulty of oil and gas replacement. When Gr is equal to 1, the oil−gas interface reaches stable migration conditions. Larger formation dip angle, higher permeability, smaller oil viscosity, and lower gas injection rate are the favorable conditions for forming stable flow. The findings are recommended to be used in reservoirs with relatively homogeneous reservoirs, certain dip angles, and moderate or low oil viscosity.

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Section: Introductionmentioning

confidence: 99%

Establishment of Stability Evaluation Criteria for the Oil–Gas Interface during Gas-Cap Gravity Flooding in Oil Reservoirs with Strong Edge-Water Drive

et al. 2023

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“…Considering the inuence of oil-gas density contrast, reservoir wettability, contact angle, and oil-gas viscosity ratio on recovery factor, many scholars established new dimensionless numbers to predict the gravity-driven process and recovery factor of gas injection. 5,27,36,38,39 Rostami et al 28 dened viscosity coefficient, which can predict the GAGD recovery factor of a thickened oil reservoir with high permeability considering the viscosity reduction and dissolution of gas in crude oil. Chen et al 40 dened the oxidation number at low temperature and accurately predicted the recovery factor of oxygen-reduced-air-assisted gravity drainage considering the inuence of oxidation reaction at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Performance demonstration of gas-assisted gravity drainage in a heterogeneous reservoir using a 3D scaled model

et al. 2021

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“…In gas assisted gravity drainage (GAGD) oil recovery is influenced by reservoir rock and fluid specific properties, such as heterogeneity of the formation, wettability, oil and gas density, oil and gas viscosity, viscous force, capillary force, gravity, gas injection rate, and gas-oil miscibility or interfacial tension (Catalan et al, 1994;Caubit et al, 2004;Parsaei and Chatzis, 2011;Wu et al, 2013;Ameri et al, 2015;Khorshidian et al, 2017) Parsaei and Chatzis (2011) through a systematic experimental study investigated the impact of reservoir wettability variations at the macroscopic scale on oil recovery efficiency in gravity-assisted inert gas injection (GAIGI) process for tertiary recovery of residual oil by waterflooding. Obtained experimental results showed that for a positive oil-spreading coefficient, the continuity of water-wet portions of the heterogeneous porous medium favors the tertiary oil recovery through the film flow mechanism.…”

Section: Impact On Gas-assisted Drainage Processmentioning

confidence: 99%

Review of studies on pore-network modeling of wettability effects on waterflood oil recovery

Wopara¹,

Iyuke²

2018

J. Petroleum Gas Eng.

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Waterflooding has become by far the most widely applied method for enhanced oil recovery, accounting for more than half of oil production worldwide. Changes in the wettability of a porous medium and the chemical composition of the wetting fluid result to changes in oil recovery. In recent time, pore-network modeling has been used increasingly to study the effect of wettability on waterflood oil recovery and multiphase flow properties in different types of petroleum reservoirs. Starting from single pore models of fluid arrangements, computations of relative permeability, interfacial area, mass dissolution rate and many other physical properties have been made. Using realistic representations of the pore spaces of various rock systems, it is now possible to predict many petro-physical properties that govern fluid flow and transport in petroleum reservoir rock systems. Such properties include porosity, permeability, waterflood relative permeability, capillary pressure, phase saturations, and fluid transfer coefficients. This review looks briefly into some of the successes made so far on pore network modeling, with an emphasis on models of wettability trends and oil recovery by waterflooding.

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Predicting the Method of Oil Recovery in the Gas-assisted Gravity Drainage Process

Cited by 7 publications

References 8 publications

Establishment of Stability Evaluation Criteria for the Oil–Gas Interface during Gas-Cap Gravity Flooding in Oil Reservoirs with Strong Edge-Water Drive

Establishment of Stability Evaluation Criteria for the Oil–Gas Interface during Gas-Cap Gravity Flooding in Oil Reservoirs with Strong Edge-Water Drive

Performance demonstration of gas-assisted gravity drainage in a heterogeneous reservoir using a 3D scaled model

Review of studies on pore-network modeling of wettability effects on waterflood oil recovery

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