Capillary pressure curves for low permeability chalk obtained by NMR imaging of core saturation profiles

Jens Vinther Norgaard, Dan Olsen, Niels Springer, Jan Reffstrup

Research output: Contribution to conferencePaper at conferencepeer-review

11 Citations (Scopus)

Abstract

A new technique for obtaining water-oil capillary pressure curves, based on NMR imaging of the saturation distribution in flooded cores is presented. In this technique, a steady state fluid saturation profile is developed by flooding the core at a constant flow rate. At the steady state situation where the saturation distribution no longer changes, the local pressure difference between the wetting and non-wetting phases represents the capillary pressure. The saturation profile is measured using an NMR technique and for a drainage case, the pressure in the non-wetting phase is calculated numerically. The paper presents the NMR technique and the procedure for calculating the pressure distribution in the sample. Inhomogeneous samples produce irregular saturation profiles, which may be interpreted in terms of variation in permeability, porosity, and capillary pressure. Capillary pressure curves for North Sea chalk obtained by the new technique show good agreement with capillary pressure curves obtained by traditional techniques.

Original languageEnglish
Pages807-816
Number of pages10
Publication statusPublished - 1995
EventProceedings of the 1995 SPE Annual Technical Conference and Exhibition - Dallas, TX, USA
Duration: 22 Oct 199525 Oct 1995

Conference

ConferenceProceedings of the 1995 SPE Annual Technical Conference and Exhibition
CityDallas, TX, USA
Period22/10/9525/10/95

Programme Area

  • Programme Area 3: Energy Resources

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