Estimating diffusion coefficients of shale oil, gas, and condensate with nano-confinement effect
Abstract
Molecular diffusion plays an important role in oil and gas migration in tight shale formations. However, there are insufficient reference data in the literature to specify the diffusion coefficients within porous media. This study aims at calculating diffusion coefficients of shale gas, shale condensate, and shale oil at reservoir conditions with CO2 injection for EOR/EGR. The large nano-confinement effects including large gas-oil capillary pressure and critical property shifts could alter the phase behaviors. This paper estimates the diffusivities of shale fluids in nanometer-scale shale rock from two perspectives: 1) examining the shift of diffusivity caused by nanopore confinement effects from phase change (phase composition and fluid property) perspective, and 2) calculating the effective diffusion coefficient in porous media by incorporating rock intrinsic properties (porosity and tortuosity factor). The tortuosity is obtained by using tortuosity-porosity relations as well as the measured tortuosity of shale from 3D imaging techniques. The results indicated that nano-confinement effects could affect the diffusion coefficient through altering the phase properties, such as phase compositions and densities. Compared to bulk phase diffusivity, the effective diffusion coefficient in porous shale rock is reduced by 102 to 104 times as porosity decreases from 0.1 to 0.03.
- Authors:
-
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Publication Date:
- Research Org.:
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1849267
- Alternate Identifier(s):
- OSTI ID: 1619426
- Grant/Contract Number:
- FE0031576
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Petroleum Science and Engineering
- Additional Journal Information:
- Journal Volume: 193; Journal Issue: C; Journal ID: ISSN 0920-4105
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 04 OIL SHALES AND TAR SANDS; 42 ENGINEERING; Energy & Fuels; Engineering; Diffusion coefficient; Shale type fluids; Nano-confinement effect; Critical property shifts; Porous media
Citation Formats
Du, Fengshuang, and Nojabaei, Bahareh. Estimating diffusion coefficients of shale oil, gas, and condensate with nano-confinement effect. United States: N. p., 2020.
Web. doi:10.1016/j.petrol.2020.107362.
Du, Fengshuang, & Nojabaei, Bahareh. Estimating diffusion coefficients of shale oil, gas, and condensate with nano-confinement effect. United States. https://doi.org/10.1016/j.petrol.2020.107362
Du, Fengshuang, and Nojabaei, Bahareh. Mon .
"Estimating diffusion coefficients of shale oil, gas, and condensate with nano-confinement effect". United States. https://doi.org/10.1016/j.petrol.2020.107362. https://www.osti.gov/servlets/purl/1849267.
@article{osti_1849267,
title = {Estimating diffusion coefficients of shale oil, gas, and condensate with nano-confinement effect},
author = {Du, Fengshuang and Nojabaei, Bahareh},
abstractNote = {Molecular diffusion plays an important role in oil and gas migration in tight shale formations. However, there are insufficient reference data in the literature to specify the diffusion coefficients within porous media. This study aims at calculating diffusion coefficients of shale gas, shale condensate, and shale oil at reservoir conditions with CO2 injection for EOR/EGR. The large nano-confinement effects including large gas-oil capillary pressure and critical property shifts could alter the phase behaviors. This paper estimates the diffusivities of shale fluids in nanometer-scale shale rock from two perspectives: 1) examining the shift of diffusivity caused by nanopore confinement effects from phase change (phase composition and fluid property) perspective, and 2) calculating the effective diffusion coefficient in porous media by incorporating rock intrinsic properties (porosity and tortuosity factor). The tortuosity is obtained by using tortuosity-porosity relations as well as the measured tortuosity of shale from 3D imaging techniques. The results indicated that nano-confinement effects could affect the diffusion coefficient through altering the phase properties, such as phase compositions and densities. Compared to bulk phase diffusivity, the effective diffusion coefficient in porous shale rock is reduced by 102 to 104 times as porosity decreases from 0.1 to 0.03.},
doi = {10.1016/j.petrol.2020.107362},
journal = {Journal of Petroleum Science and Engineering},
number = C,
volume = 193,
place = {United States},
year = {Mon May 11 00:00:00 EDT 2020},
month = {Mon May 11 00:00:00 EDT 2020}
}
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