Simultaneous determination of capillary pressure and relative permeabilities

Muhammad R. Hashmet, Isa M. Tan, Saeed Majidaei, Muhammad Mushtaq

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Simulation of multiphase flow in porous media requires knowledge of relative permeabilities. Such data can be obtained from laboratory experiments, either steady state or un-steady state methods. Steady state experiments are time consuming, and can run over several days to acquire a complete set of relative permeabilities. Unsteady state methods are limited to displacements where the assumptions underlying the Buckley-Leverett theory is satisfied and capillary pressure must be ignored. Capillary pressures are generated where interfaces between two immiscible fluids exist in the pores (capillaries) of the reservoir rock. Due to the interfacial energy of the interface between the two phases, a difference in the pressure across the interface results in a curvature of the interface. It is usual to consider one phase as a wetting phase and the other as a nonwetting phase. However, intermediate cases occur which can greatly complicate the picture. In this paper a simultaneous determination of relative permeability and capillary pressure was achieved from the results of a single two phase flow experiment using Sendra Software. By using this software a first simulation was performed and then the results were history matched using core flood data. The core flood experiment is a standard imbibition or drainage displacement with an imposed difference in pressure. A four-step core-flooding scheme provides the differential pressure across the core, production data as a function of time, injection rates from which the relative permeabilities and capillary pressures are computed for both drainage and imbibition by Sendra. Finally the capillary pressures and relative permeabilities were compared using different correlations available in the software. After comparing the different correlation for relative permeabilities and capillary pressure the best correlation was selected for each.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE Saudi Arabia Section Technical Symposium and Exhibition 2012
PublisherSociety of Petroleum Engineers
Number of pages11
ISBN (Print)9781632667113
Publication statusPublished - Jan 1 2012
Externally publishedYes
EventSPE Saudi Arabia Section Technical Symposium and Exhibition 2012 - Al-Khobar, Saudi Arabia
Duration: Apr 8 2012Apr 11 2012

Publication series

NameSociety of Petroleum Engineers - SPE Saudi Arabia Section Technical Symposium and Exhibition 2012


ConferenceSPE Saudi Arabia Section Technical Symposium and Exhibition 2012
CountrySaudi Arabia

ASJC Scopus subject areas

  • Geochemistry and Petrology

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