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Research Papers: Petroleum Engineering

Disjoining Pressure and Gas Condensate Coupling in Gas Condensate Reservoirs

[+] Author and Article Information
Mohammad Mohammadi-Khanaposhtani

Faculty of Fouman,
College of Engineering,
University of Tehran,
P.O. Box 43515-1155,
Fouman 43516-66456, Iran
e-mail: muhammadi_mu@ut.ac.ir

Alireza Bahramian

Institute of Petroleum Engineering,
University of Tehran,
Tehran 14395-515, Iran

Peyman Pourafshary

Petroleum and Chemical
Engineering Department,
Sultan Qaboos University,
Muscat 123 Al-Khodh, Oman

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 12, 2013; final manuscript received June 10, 2014; published online June 24, 2014. Assoc. Editor: Arash Dahi Taleghani.

J. Energy Resour. Technol 136(4), 042911 (Jun 24, 2014) (6 pages) Paper No: JERT-13-1339; doi: 10.1115/1.4027851 History: Received December 12, 2013; Revised June 10, 2014

Pore-scale coupled flow of gas and condensate is believed to be the main mechanism for condensate production in low interfacial tension (IFT) gas condensate reservoirs. While coupling enhances condensate flow due to transport of condensate lenses by the gas, it dramatically reduces gas permeability by introducing capillary resistance against gas flow. In this study, a dynamic wetting approach is used to investigate the effect of viscous resistance, IFT and disjoining pressure on pore-scale coupling of gas and condensate. Disjoining pressure arises from van der Waals interactions between gas and solid through thin liquid films, e.g., condensate films on pore walls. Low values of IFT and small pore diameters, as involved in many gas condensate reservoirs, give rise to importance of disjoining pressure. Calculations show that disjoining pressure postpones gas condensate coupling to higher condensate flow fractions-from about 0.08 for vanishing disjoining effect to more than 0.16 for strong disjoining effect. Results also suggest that strong disjoining effect will result in higher gas relative permeability after coupling. Finally, the positive rate effect on gas permeability is only observed when disjoining effects are weak.

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Figures

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Fig. 1

Disturbance of the film interface by surface waves inside a capillary tube

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Fig. 2

Transition of annular film flow to slug flow by formation of liquid lens

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Fig. 3

Schematic of an axisymmetric bubble inside a microcapillary tube, Yi is the height of interface

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Fig. 4

Arc length-angle coordinate system

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Fig. 5

Condensate flow fraction at the onset of lens formation, i.e., onset of coupling

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Fig. 6

Comparison of initial gas pressure drop with coupling pressure drop at the onset of lens formation (μg = 0.2μl)

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Fig. 7

Calculated values of (a) gas and (b) condensate relative permeability for a bundle of cylindrical capillary tubes (μg = 0.2μl)

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