Cement thickness measurements in cased boreholes

Details Cement thickness measurements in cased boreholes Cement thickness measurements in cased boreholes

1977-06-13

1978-12-12

Willis, Davis L.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250266, G01V 500

Patent

active

041297776

ABSTRACT:
Methods and apparatus are provided for logging a borehole having solid matter along at least a portion of the wall thereof. Gamma radiation is emitted from the borehole into the surrounding media, and the amount of radiation which returns to the borehole is measured by three detectors located at different distances from the source of radiation, so as to be primarily sensitive to radiation which has respectively penetrated to three different depths in the surrounding media. The thickness of the solid matter on the borehole wall is then determined from the three gamma radiation measurements.

REFERENCES:
patent: 3976879 (1976-08-01), Turcotte
patent: 4048495 (1977-09-01), Ellis

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