| 摘要 |
A method and apparatus for measuring the gamma radiation levels of drilling mud expelled from an oil and gas bore hole to determine the composition of the earth at the bottom of the bore hole and, when used in conjunction with a Measurement While Drilling gamma radiation detector, to determine the time and location of bore hole cavings. A first gamma radiation detector measures the gamma radiation level of the drilling mud with the bore hole entrained material, and a second gamma radiation detector measures the gamma radiation of the drilling mud without the entrained material. The difference between the two measurements is lagged to the time between the detectors and the bore hole bottom.
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