Apparatus and method for determining density, porosity and...

Details Apparatus and method for determining density, porosity and... Apparatus and method for determining density, porosity and...

2005-08-30

2005-08-30

Lee, John R. (Department: 2881)

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

C250S269400, C250S269100

Reexamination Certificate

active

06936812

ABSTRACT:
A borehole logging system for determining bulk density, porosity and formation gas/liquid fluid saturation of formation penetrated by a borehole. Measures of fast neutron radiation and inelastic scatter gamma radiation, induced by a pulsed neutron source, are combined with an iterative numerical solution of a two-group diffusion model to obtain the formation parameters of interest. Double-valued ambiguities in prior art measurements are removed by using the iterative solution of the inverted two-group diffusion model. The system requires two gamma ray detectors at different axial spacings from the source, and a single neutron detector axially spaced between the two gamma ray detectors. The system can be embodied as a wireline system or as a logging-while-drilling system.

REFERENCES:
patent: 5900627 (1999-05-01), Odom et al.

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