Apparatus and method for taking measurements while drilling

Measuring and testing – Borehole or drilling – Downhole test

Patent

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Details

166250, E21B 4706

Patent

active

048814067

ABSTRACT:
A first temperature sensor is carried by the drill pipe on a radially extensible arm for positioning the sensor at or near the face of the well bore for measuring the true temperature of the face. A second temperature sensor at an intermediate position on the arm measures the temperature of the drilling fluid near the location of the first sensor. The first sensor takes a plurality of readings over a predetermined period of time to detect changes in surface temperature. Both sensors transmit their measurements to a microprocessor, which employs the laws of multidimensional and transient heat transfer by conduction to calculate the true formation temperature.

REFERENCES:
patent: 4109717 (1978-08-01), Cooke, Jr.
patent: 4765183 (1988-08-01), Coury

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