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Analytical investigations the effect of temperature and pressure on spontaneous countercurrent imbibition in unsaturated porous media Dong Feng, Keliu Wu, xiangzeng wang, Jing Li, juntai shi, yanjun zhang, peng qi, and xiangfang li Energy Fuels, Just Accepted Manuscript • DOI: 10.1021/acs.energyfuels.9b02310 • Publication Date (Web): 26 Aug 2019 Downloaded from pubs.acs.org on August 29, 2019
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Energy & Fuels
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Analytical investigations the effect of temperature and pressure on
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spontaneous countercurrent imbibition in unsaturated porous media
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Dong Feng a,b, Keliu Wua,b*, Xiangzeng Wang c, Jing Lid*, Juntai Shia, Yanjun Zhanga, Peng Qia,
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Xiangfang Lia,b
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a State
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(Beijing), Beijing 102249, P.R. China.
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bMOE
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102249, PR China
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c Shaanxi
Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum
Key Laboratory of Petroleum Engineering, China University of Petroleum (Beijing), Beijing
Yanchang Petroleum (Group) Corp. Ltd., Xi’an 710075, P.R. China.
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d Chemical
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* Corresponding author: Keliu Wu, Jing Li
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E-mail address:
[email protected] [email protected] 13
HIGHLIGHTS
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(1) The interfacial tension (IFT) of CH4/water system and N2/water system as a function of temperature
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and pressure were modelled.
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(2) The effects of increasing temperature and increasing pressure on imbibition characteristics were
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investigated.
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(3) The imbibition process between methane/water/rock system and air/water/rock system was
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compared.
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(4) A correction is needed if traditional air/water/rock experiments are used to evaluate the imbibition
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characteristics under geological condition.
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ABSTRACT
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Capillary spontaneous imbibition main occurs in fractured reservoirs, low permeability reservoirs and
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unconventional reservoirs simultaneously accompanied with high temperature and pressure. In this
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paper, we present computations of spontaneous imbibition based on the classical fractional flow theory
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and proposed temperature and pressure-dependent IFT relationships. Our work emphasizes that there
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are some discrepancies if we evaluate the spontaneous imbibition characteristics under geological
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conditions based on the traditional air/water/rock system experiments at the atmospheric environment.
and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada
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ACS Paragon Plus Environment
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In detail, both of the increasing temperature and pressure can decrease the IFT (capillary driving force),
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and the pressure effect is more significant. The increasing temperature will facilitate the water intake,
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as the results of competition between the positive role of enhanced wetting fluidity and negative role
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of reduced IFT, while the increasing pressure will slow down the water propagation due to the
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cooperation of reduced capillary driving force and increased nonwetting flow resistance. Besides, the
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nonwetting (gas) phase type will also influence the imbibition process, and the distinction between
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methane/water/rock system and air/water/rock system is controlled by the nonwetting phase viscosity
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difference at low pressure while by the IFT difference at relatively high pressure. Furthermore, for the
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given porous media and fluid properties, faster water saturation profile propagation for the initial water
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saturation range (0
