Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1994-10-20
1996-03-12
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324307, G01R 3344
Patent
active
054989604
ABSTRACT:
A lithology-independent method of well logging the gas saturation in a reservoir containing natural gas. The method makes use of a pulsed NMR logging tool utilizing a recovery time that is greater than the relaxation time of hydrocarbon gas within the formation. In a preferred embodiment, two different NMR logs are obtained: one with a recovery time significantly shorter than the longitudinal relaxation time, T1, of the gas and one with a recovery time equal to or longer than T1. The amplitudes of the two logs are subtracted and the remainder divided by the hydrogen index of the gas at reservoir conditions to determine the pore volume occupied by gas.
REFERENCES:
patent: 3657730 (1972-04-01), Robinson et al.
patent: 4528508 (1985-07-01), Vail, III
patent: 5122746 (1992-06-01), King et al.
patent: 5389877 (1995-02-01), Sezginer et al.
Akkurt Ridvan
Tutunjian Pierre N.
Vinegar Harold J.
Christensen Del S.
Mah Raymond Y.
O'Shea Sandra L.
Shell Oil Company
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