초록 ▼

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 dril

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.

대표청구항 ▼

An apparatus for taking measurements while drilling an earth formation at the wall of a well bore and calculating therefrom by the laws of multidimensional and transient heat transfer by conduction a desired reservoir property, comprising: a temperature sensing means for measuring the temperature of

An apparatus for taking measurements while drilling an earth formation at the wall of a well bore and calculating therefrom by the laws of multidimensional and transient heat transfer by conduction a desired reservoir property, comprising: a temperature sensing means for measuring the temperature of the face of a well bore; a support means for carrying said temperature sensing means at a preselected depth in the well bore, substantially at the position of the earth formation to be measured;