Effect of Clay Composition on Irreducible Water Saturation, as Determined Using Low-Field Nuclear Magnetic Resonance
Manalo, F.P. and Kantzas, A.
SCA 2002-52, presented at the 2002 International Symposium of the Society of Core Analysts, held in Monterey, California, USA, September 22-25, 2002.
The presence of movable fines may have an impact on oil production. This paper will show that low-field nuclear magnetic resonance (NMR) can be used to obtain information regarding the interactions between clays and the fluids they are exposed to. A comprehensive experimental program was conducted to determine differences in the interactions between different types of clays and different types of fluids (distilled and tap water and mild brine). The results show that the different isolated clay samples provide signature amplitude peaks in a transverse relaxation (T2) distribution, despite similarity in particle size distributions. These results indicate that low-field NMR can be used to qualitatively identify the presence of clays in a sample and can indicate clay type. This information could prove to be useful in determining the methods in which to handle and analyse core samples.