A New Empirical Correlation for Predicting Effective Molecular Diffusivity of Gas-Heavy Oil-Porous Media Systems

Zamanian, E.; Mirjordavi, Navid; Kazemeini, Mohammad; Ghazanfari, Mohammad Hossein

doi:10.1615/specialtopicsrevporousmedia.v3.i1.30

Cited by 2 publications

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“…As the development of conventional oil and gas resources steps into the final stage, unconventional oil and gas become the main replacement resources. With the successful commercial development of shale reservoirs in North America, shale oil and gas have become one of the most important areas of exploration and production. − The shale reservoir is dominated by nanopores, and the permeability is about 10 –3 to 10 –4 mD, which makes it difficult for crude oil to flow in the formation. − Gas diffusion under a concentration gradient became the main mass transfer mechanism of injection gas in shale oil formation. − In conventional reservoirs, the main mechanisms of CO 2 injection to EOR are pressure maintenance, reducing crude oil viscosity, extracting light components, and reducing the IFT. , The fracture with high conductivity in the shale reservoir will affect the CO 2 injection development result . As the focus gradually shifts from the conventional reservoir to the unconventional reservoir and the difficulty of CO 2 injection increases, researchers proposed an innovative injection method of CO 2 huff-n-puff (HNP). − CO 2 HNP had enhanced the shale oil recovery in the Bakken shale reservoir effectively.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Effect on Shale Oil Recovery by CO₂ Huff-n-Puff

Peng

Sheng

2023

Energy Fuels

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The CO 2 diffusion effect is an important mechanism of injected CO 2 penetrating the reservoir matrix and diffusing into the oil phase during the huff-n-puff (HNP) process. However, the CO 2 diffusion coefficient of shale is still uncertain under the reservoir conditions, and the contribution of diffusion to enhanced oil recovery (EOR) needs to be further explored. In this study, the CO 2 diffusion coefficient of shale is determined under the simulated reservoir conditions (9−10 MPa, 90 °C) in the laboratory, and the determined CO 2 diffusion coefficient is applied in the reservoir numerical model to evaluate the contribution of the CO 2 diffusion effect to EOR in the HNP process. First, a radial constant volume diffusion (RCVD) device was built to measure the CO 2 diffusion coefficient by the pressure decay method. After that, both the analytical solution and the numerical solution are used to ensure that the result is correct. Finally, a field-scale model consisting of one stage of hydraulic fracture in a shale oil reservoir is established. The effects of reservoir properties such as fracture spacing, fracture half-length, and operational properties of HNP like injection rate, injection time, and soaking time on oil recovery were discussed when the diffusion was included and excluded. The CO 2 diffusion coefficient of a shale core is ranging from 1.44 × 10 −7 to 5.50 × 10 −7 cm 2 /s, and it is reasonable to be applied in the field reservoir numerical simulation model. According to simulation results, the lower fracture spacing and longer fracture half-length make more CO 2 diffuse into the shale matrix, which are critical parameters, to promote the CO 2 diffusion effect. When the injection rate is slow and the injection time is short, the CO 2 diffusion effect in the reservoir may contribute more to EOR. A high injection rate means sufficient pressure supplement, and the CO 2 diffusion effect may become relatively negligible. The soaking time may not be necessary for the EOR of HNP, but the longer soaking time will promote the contribution of CO 2 diffusion to EOR, and the incremental recovery is about 0.15−0.26%.

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Section: Introductionmentioning

confidence: 99%

Diffusion Effect on Shale Oil Recovery by CO₂ Huff-n-Puff

Peng

Sheng

2023

Energy Fuels

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“…The complementarity of these two kinds of work is due to the fact that numerical studies still face strong difficulties in solving massively detailed kinetic mechanism and in handling porous flow with microscopic description over full length scales and over long timescales (Jaber and Ziad Saghir, 2011). On the opposite, it is difficult experimentally to determine microscopic or local parameters such as the temperature or the species concentration and to measure the heat flux or the residence time (Khan and Reddy Gorla, 2010;Elgazery, 2012;Zamanian et al, 2012). For this reason, a European collaboration has been settled to establish a numerical modelling of reactive porous flow with semi-detailed chemistry and taking the other physical parameters into account (heat and mass transfers, multi-diffusion, porous flow modelling, compressibility effects, real fluid properties) (Romagnosi et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis in Porous Media: Part 2. Numerical Analysis and Comparison to Experiments

et al. 2013

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Only limited studies are available experimentally to investigate hydrocarbon fuel pyrolysis, which can be of practical interest for the active cooling of head loaded components in aerospace vehicles such as combustors in rocket engines. The numerical simulation is an additional way to investigate the related phenomena (heat and mass transfer with chemistry). After a first code validation with experiments based upon inert gases, the code is further extended towards permeation with reactive dodecane and a reasonable agreement is found. The experimental accuracy of the permeability's' determination is confirmed numerically to be within ± 30 %.

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A New Empirical Correlation for Predicting Effective Molecular Diffusivity of Gas-Heavy Oil-Porous Media Systems

Cited by 2 publications

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Diffusion Effect on Shale Oil Recovery by CO₂ Huff-n-Puff

Diffusion Effect on Shale Oil Recovery by CO₂ Huff-n-Puff

Pyrolysis in Porous Media: Part 2. Numerical Analysis and Comparison to Experiments

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A New Empirical Correlation for Predicting Effective Molecular Diffusivity of Gas-Heavy Oil-Porous Media Systems

Cited by 2 publications

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Diffusion Effect on Shale Oil Recovery by CO2 Huff-n-Puff

Diffusion Effect on Shale Oil Recovery by CO2 Huff-n-Puff

Pyrolysis in Porous Media: Part 2. Numerical Analysis and Comparison to Experiments

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Diffusion Effect on Shale Oil Recovery by CO₂ Huff-n-Puff

Diffusion Effect on Shale Oil Recovery by CO₂ Huff-n-Puff