Methods for determining in situ the viscosity of heavy oil

Details Methods for determining in situ the viscosity of heavy oil Methods for determining in situ the viscosity of heavy oil

2011-06-21

2011-06-21

Shrivastav, Brij B (Department: 2858)

Electricity: measuring and testing

Particle precession resonance

Using well logging device

C324S300000

Reexamination Certificate

active

07965078

ABSTRACT:
Viscosity of heavy oil is determined in situ in a formation by making nuclear magnetic resonance (NMR) measurements in the formation, and then calculating viscosity according to an equation of the formT2⁢LM=a+b⁡(ηT)c,where T is the temperature of the heavy oil sample, η is the viscosity, T2LMis the logarithmic mean of the T2distribution spectrum of the sample, and a, b, and c are non-zero constants. Typically, constant b has a value between 5 and 7 and constant c has a value between −0.7 and −0.5.

REFERENCES:
patent: 5596274 (1997-01-01), Sezginer
patent: 7301339 (2007-11-01), Cheng et al.
patent: 7372264 (2008-05-01), Akkurt et al.
patent: 2010/0039109 (2010-02-01), Cheng et al.
Zittel et al : Reservoir crude-oil Viscosity Estimation from Wireliine NMR Measurements; SPE Annual Technical Conference held in San Antonio, pp. 24-27, Sep. 2006.

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