Estimating Diffusion Coefficients of Shale Oil, Gas, and Condensate with Nano-Confinement Effect

Du, Fengshuang; Nojabaei, Bahareh

doi:10.2118/196589-ms

Cited by 11 publications

(2 citation statements)

References 42 publications

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“…They concluded that the Hayduk and Minhas correlation [16] agrees well with the experimental data. Du and Nojabaei [17] investigated different diffusion coefficient correlations and concluded that the Sigmund correlation [14] shows the closest match to the experimental data.…”

Section: Introductionmentioning

confidence: 90%

Effects of Diffusion, Adsorption, and Hysteresis on Huff-n-Puff Performance in Ultratight Reservoirs with Different Fluid Types and Injection Gases

Enab

Emami-Meybodi

2021

Energies

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Cyclic solvent injection, known as solvent huff-n-puff, is one of the promising techniques for enhancing oil recovery from shale reservoirs. This study investigates the huff-n-puff performance in ultratight shale reservoirs by conducting large-scale numerical simulations for a wide range of reservoir fluid types (retrograde condensate, volatile oil, and black oil) and different injection gases (CO2, C2H6, and C3H8). A dual-porosity compositional model is utilized to comprehensively evaluate the impact of multicomponent diffusion, adsorption, and hysteresis on the production performance of each reservoir fluid and the retention capacity of the injection gases. The results show that the huff-n-puff process improves oil recovery by 4–6% when injected with 10% PV of gas. Huff-n-puff efficiency increases with decreasing gas-oil ratio (GOR). C2H6 provides the highest recovery for the black oil and volatile oil systems, and CO2 provides the highest recovery for retrograde condensate fluid type. Diffusion and adsorption are essential mechanisms to be considered when modeling gas injection in shale reservoirs. However, the relative permeability hysteresis effect is not significant. Diffusion impact increases with GOR, while adsorption impact decreases with increasing GOR. Oil density reduction caused by diffusion is observed more during the soaking period considering that the diffusion of the injected gas caused a low prediction error, while adsorption for the injected gas showed a noticeable error.

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Section: Introductionmentioning

confidence: 90%

Effects of Diffusion, Adsorption, and Hysteresis on Huff-n-Puff Performance in Ultratight Reservoirs with Different Fluid Types and Injection Gases

Enab

Emami-Meybodi

2021

Energies

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“…where M ik is the molecular weight of solvent; µ k is the viscosity of phase k; and v bi is the partial molar volume of component i at the boiling point. It should be noted that Wilke-Chang (1955) correlation was developed for low-pressure liquid systems and a recent study indicated that the application of Wilke-Chang correlation is not suitable for high-pressure shale fluids [41]. A more generalized diffusion correlation was developed by Leahy-Dios and Firoozabadi (2007), which is capable of estimating the diffusivities of gas, liquid, and supercritical states of nonpolar binary or multicomponent mixtures at a wide pressure and temperature range [42].…”

Section: Sensitivity Analysismentioning

confidence: 99%

A Review of Gas Injection in Shale Reservoirs: Enhanced Oil/Gas Recovery Approaches and Greenhouse Gas Control

Nojabaei

2019

Energies

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107

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Shale oil and gas resources contribute significantly to the energy production in the U.S. Greenhouse gas emissions come from combustion of fossil fuels from potential sources of power plants, oil refineries, and flaring or venting of produced gas (primarily methane) in oilfields. Economic utilization of greenhouse gases in shale reservoirs not only increases oil or gas recovery, but also contributes to CO2 sequestration. In this paper, the feasibility and efficiency of gas injection approaches, including huff-n-puff injection and gas flooding in shale oil/gas/condensate reservoirs are discussed based on the results of in-situ pilots, and experimental and simulation studies. In each section, one type of shale reservoir is discussed, with the following aspects covered: (1) Experimental and simulation results for different gas injection approaches; (2) mechanisms of different gas injection approaches; and (3) field pilots for gas injection enhanced oil recovery (EOR) and enhanced gas recovery (EGR). Based on the experimental and simulation studies, as well as some successful field trials, gas injection is deemed as a potential approach for EOR and EGR in shale reservoirs. The enhanced recovery factor varies for different experiments with different rock/fluid properties or models incorporating different effects and shale complexities. Based on the simulation studies and successful field pilots, CO2 could be successfully captured in shale gas reservoirs through gas injection and huff-n-puff regimes. The status of flaring gas emissions in oilfields and the outlook of economic utilization of greenhouse gases for enhanced oil or gas recovery and CO2 storage were given in the last section. The storage capacity varies in different simulation studies and is associated with well design, gas injection scheme and operation parameters, gas adsorption, molecular diffusion, and the modelling approaches.

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Huff-n-Puff (HNP) design for shale reservoirs using local dual-porosity, dual-permeability compositional simulation

et al. 2022

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Estimating Diffusion Coefficients of Shale Oil, Gas, and Condensate with Nano-Confinement Effect

Cited by 11 publications

References 42 publications

Effects of Diffusion, Adsorption, and Hysteresis on Huff-n-Puff Performance in Ultratight Reservoirs with Different Fluid Types and Injection Gases

Effects of Diffusion, Adsorption, and Hysteresis on Huff-n-Puff Performance in Ultratight Reservoirs with Different Fluid Types and Injection Gases

A Review of Gas Injection in Shale Reservoirs: Enhanced Oil/Gas Recovery Approaches and Greenhouse Gas Control

Huff-n-Puff (HNP) design for shale reservoirs using local dual-porosity, dual-permeability compositional simulation

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