The behavior of confined fluids in shale reservoirs is significantly different from that of bulk fluids due to the confinement of nanopores. The unique physicochemical properties of confined fluids invalidate the current available equations of state (EOS) used in such reservoirs. In this study, first, the molar volume term of the Peng-Robinson equation of state (PR-EOS) is modified to describe the phase behavior of fluid under confinement. Second, a new dimensionless parameter β is proposed to describe fluid adsorption in nanopores and its empirical correlation is given. Finally, based on the modified PR-EOS, a generalized analytical formula is proposed to calculate critical temperature and pressure shifts by considering fluid adsorption in the nanopores. The modified PR-EOS, new adsorption correlation, and generalized formulations have been validated to be accurate by comparing with the experimental and molecular simulation results. The modified PR-EOS can provide a consistent fluid phase behavior description over the macro-to nano-scale pore sizes.
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Carbon Management Technology Conference
July 15–18, 2019
Houston, Texas, USA
ISBN:
978-1-61399-724-6
Modifying Peng-Robinson Equation of State To Consider Influence of Confinement on Fluid Phase Behavior
Yilei Song;
Yilei Song
China University of Petroleum, Beijing / Beijing Key Laboratory of Greenhouse Gas Sequestration and Oil Exploitation
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Zhaojie Song;
Zhaojie Song
China University of Petroleum, Beijing / Beijing Key Laboratory of Greenhouse Gas Sequestration and Oil Exploitation
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Jirui Hou;
Jirui Hou
China University of Petroleum, Beijing / Beijing Key Laboratory of Greenhouse Gas Sequestration and Oil Exploitation
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Zhixing Wang
Zhixing Wang
China University of Petroleum, Beijing / Beijing Key Laboratory of Greenhouse Gas Sequestration and Oil Exploitation
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Paper presented at the Carbon Management Technology Conference, Houston, Texas, USA, July 2019.
Paper Number:
CMTC-558164-MS
Published:
July 15 2019
Citation
Song, Yilei, Song, Zhaojie, Hou, Jirui, and Zhixing Wang. "Modifying Peng-Robinson Equation of State To Consider Influence of Confinement on Fluid Phase Behavior." Paper presented at the Carbon Management Technology Conference, Houston, Texas, USA, July 2019. doi: https://doi.org/10.7122/CMTC-558164-MS
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