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Reading Room :: Theses 2001
Ali Abdallah Al-Meshari's report
by
Ali Abdallah Al-Meshari, MSE
University of Texas at Austin, 2001
Supervisor: Carlos Torres-Verdin
Fluid viscosity is one of the most important parameters necessary to assess
reservoir production and economic potential. Until the arrival of Nuclear Magnetic
Resonance (NMR) measurement techniques in the oil industry, oil viscosity
determination was mainly limited to laboratory tests and correlation with API gravity.
Reservoir engineers prefer in-situ measurements of reservoirs fluid properties to
those performed under laboratory conditions. Nuclear Magnetic Resonance logging
measurements have the potential of providing in-situ viscosity measurement because the
NMR relaxation times T1 and T2 correlate strongly with viscosity.
This report is intended to summarize the theory behind NMR in-situ
measurements, and their application. A survey is also presented of the different NMR
tools that are commercially used by different logging companies. Finally, a technical
description is included on how NMR and conventional wireline logs can be integrated to
produce accurate and reliable estimates of fluid viscosity.
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