Int. J. of Oil, Gas and Coal Technology   »   2017 Vol.15, No.4

 

 

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Title: Relative permeability prediction considering complex pore geometry and wetting characteristics in carbonate reservoirs

 

Authors: Sunlee Han; Daewoong Kwak; Youngsoo Lee; Youngho Jang; Wonmo Sung

 

Addresses:
Department of Mineral Resources and Energy Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-Gu, Jeonju-si, Jeollabuk-do 561-756, South Korea
Department of Mineral Resources and Energy Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-Gu, Jeonju-si, Jeollabuk-do 561-756, South Korea
Department of Mineral Resources and Energy Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-Gu, Jeonju-si, Jeollabuk-do 561-756, South Korea
Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahak-ro, Yuseong-gu, Daejeon 34132, Korea
Department of Natural Resources and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, South Korea

 

Abstract: The measurement of relative permeability in carbonate rocks is very uncertain because of the complex pore system. Several equations for the relative permeability have been previously developed. However, most equations assume a single pore system that cannot be applied accurately. This study presents a relative permeability estimation method that considers capillary pressure, contact angle, pore size distribution, and residual oil saturation with respect to the heterogeneous pore network. As results, the capillary pressure was observed to have different tendencies for macropore and micropore. Also, the pore size distribution index of the macropore system was greater than the micropore system. For the macropore, water has a higher relative permeability than oil; a small reduction in oil saturation can easily flow water. In contrast, the micropore tends to follow the conventional relative permeability curve. Therefore, stable water displacement was not assured, leading to an early breakthrough for the heterogeneous carbonate rocks. [Received: July 11, 2016; Accepted: January 2, 2017]

 

Keywords: heterogeneous carbonate reservoir; relative permeability; pore system; capillary pressure; Brooks-Corey equation; two-phase flow.

 

DOI: 10.1504/IJOGCT.2017.084836

 

Int. J. of Oil, Gas and Coal Technology, 2017 Vol.15, No.4, pp.331 - 346

 

Submission date: 11 Jul 2016
Date of acceptance: 30 Dec 2016
Available online: 06 Jun 2017