Equilibration Time and accuracy of Capillary Pressure Measurement Using Diaphragm Method


Guo, Y., Hammervold, W.L., Rogaland Research

SPWLA 34th Annual Logging Symposium, June 13-16, 1993



Diaphragm method using ceramic plate for measuring capillary pressure curve is believed to be the most reliable, but time consuming method. Recent works have shown that the long equilibrium time can be significantly reduced by using micro pore membrane instead of the conventional ceramic diaphragm. This is due to the fact that the long equilibrium time mainly is caused by the low permeability of the ceramic diaphragm needed to maintain a high threshold pressure. Micro filters with small pore size can maintain the required threshold pressure, and at the same time have high flow capacity giving a quicker equilibration.