Integrated logging tool for borehole

Measuring and testing – Borehole or drilling – Formation logging

Reexamination Certificate

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Reexamination Certificate

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07073378

ABSTRACT:
An apparatus for measuring characteristics of earth formations surrounding a borehole, comprises a resistivity measurement device having a multiplicity of antennae spaced between each other in a longitudinal direction of the apparatus. A neutron measurement device of the apparatus comprises at least a neutron source and at least a neutron detector, each of the neutron detectors being at a distance from the neutron source in the longitudinal direction of the apparatus. The multiplicity of antennae are interleaved with the neutron measurement device in order to reduce a total length of the apparatus and in order to allow a determined area of the earth formation to be measured simultaneously using the neutron measurement device and the resistivity measurement device.

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patent: 2004/0020647 (2004-02-01), Snoga
patent: 2004/0128073 (2004-07-01), Radtke et al.

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