Four-detector formation-density tool for use in cased and open h

Details Four-detector formation-density tool for use in cased and open h Four-detector formation-density tool for use in cased and open h

1995-07-05

1997-05-06

Fields, Carolyn E.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250266, G01V 512

Patent

active

056273681

ABSTRACT:
An improved formation density logging tool is provided that is effective in cased holes. The improved tool utilizes four detectors which generate four signals enabling the operator to calculate the four unknown variables of interest: formation density, cement thickness, cement density and casing thickness. By providing a means for calculating cement thickness, cement density and casing thickness, a more accurate calculation of formation density is provided. Further, by providing a means for calculating cement thickness, cement density and casing thickness, a more accurate neutron-porosity measurement can be made when the density tool is used in combination with a neutron tool. The tool comprises improvement over currently-available two-detector density tools which are normally useful only in open holes. It is anticipated that the tool provided herein will be useful in both open and cased holes; it is also anticipated that the casing thickness and cement thickness calculations of the tool will be used to enhance the porosity calculation of neutron-porosity tools.

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patent: 5390115 (1995-02-01), Case et al.
patent: 5530243 (1996-06-01), Mathis

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