JPT

Vol. 59 No. 5

May 2007

Formation Evaluation

Reservoir Crude-Oil-Viscosity Estimation From Wireline-NMR Measurements-Rajasthan, India

In 2004, the Mangala, Aishwariya, and Bhagyam fields were discovered in Rajasthan, India. Oil viscosity is a main factor controlling performance from these high-permeability paraffinic reservoirs. Pressure/volume/temperature (PVT) data indicate areal and vertical variations in crude-oil properties. Meter-by-meter geochemical core data corroborate vertical variations in oil composition. Continuous wireline measurements of nuclear-magnetic-resonance (NMR) log properties and station NMR properties from wells drilled with water-based mud or synthetic-oil-based mud also were used to calculate a viscosity profile. This study correlated results from all techniques and showed how NMR measurements can provide oil-viscosity profiles in compositionally complex pools.

 

View a Synopsis of SPE 101689 published in JPT.

This article, written by Technology Editor Dennis Denney, contains highlights of paper SPE 101689, "Reservoir Crude-Oil-Viscosity Estimation From Wireline-NMR Measurements Rajasthan, India," by R.J. Zittel, SPE, D. Beliveau, SPE, T. O'Sullivan, SPE, and R. Mohanty, Cairn Energy India Ltd., and J. Miles, Oil Optimizers Ltd., prepared for the 2006 SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 24-27 September.

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