Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1996-09-25
1999-08-10
Barlow, John
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324307, G01R 3344
Patent
active
059364050
ABSTRACT:
A well logging system and method for detecting the presence and estimating the quantity of gaseous and liquid hydrocarbons in the near wellbore zone. The system uses a gradient-based, multiple-frequency NMR logging tool to extract signal components characteristic for each type of hydrocarbons. To this end, a new data acquisition method is proposed in which measurements at different frequencies are interleaved to obtain, in a single logging pass, multiple data streams corresponding to different recovery times and/or diffusivity for the same spot in the formation. The resultant data streams are processed to determine mineralogy-independent water and hydrocarbon saturations and porosity estimates. Gas and oil saturations are used to obtain accurate estimates of the water content, permeability and other parameters of interest.
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Coates George R
Mardon Duncan
Miller Melvin N
Prammer Manfred G
Barlow John
Numar Corporation
Vo Hien
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