Pore network modeling of multiphase flow in fissured and vuggy carbonates

Date

2008-11-10

Author

Erzeybek, S.
Akın, Serhat

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Carbonate reservoirs have more complex structures than silicate reservoirs because of depositional and digenetic features. Secondary porosity enhancements due to fracturing or dissolution processes result complex porosity systems and thus complex flow patterns. Carbonates may contain not only matrix and fracture but also the vugs and cavities that are irregular in shape and vary in size from millimeters to centimeters in diameter. Although many of these vugs appear to be isolated from fractures, the mechanism of oil recovery from vugs in such a system is highly dependent on the location of the vugs and connections of the vugs to the fissure/fracture system. Two phase flow in fissured and vuggy carbonates was studied by developing a novel pore network model that consists of several sub-networks including matrix, vug and fissure sub-networks. Matrix blocks were constructed by pores with triangular and pore throats with square cross-sections respectively. Fissures and vugs were represented by square cross sections. In order to obtain a spatially uncorrelated model, pore radiuses, which were obtained from previously conducted thin section analysis of a carbonate rock, and pore throat radiuses with a uniform distribution were randomly distributed. It was observed that the developed model can successfully simulate primary drainage, and secondary imbibition processes like snap-off, piston like advance and pore body filling. Comparison of pore network results and several published experimental results showed the uses and applications of the proposed pore network model. It was concluded that this novel pore network model design successfully represents two phase flow in a fissured and vuggy carbonate rock.

Subject Keywords

Carbonate rocks, Microanalytical model, Flow in porous media

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=55349148029&origin=inward
https://hdl.handle.net/11511/73138

DOI

https://doi.org/10.2118/113384-ms

Conference Name

16th SPE/DOE Improved Oil Recovery Symposium 2008 - "IOR: Now More Than Ever (19 - 23 Nisan 2008)

Collections

Unverified, Conference / Seminar

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Citation Formats

S. Erzeybek and S. Akın, “Pore network modeling of multiphase flow in fissured and vuggy carbonates,” Tulsa, OK, Amerika Birleşik Devletleri, 2008, vol. 2, p. 656, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=55349148029&origin=inward.