Thermal conductivity probe for fluid identification

Details Thermal conductivity probe for fluid identification Thermal conductivity probe for fluid identification

1984-05-10

1986-03-11

Yasich, Daniel M.

Thermal measuring and testing

Temperature measurement

Geophysical

73154, 374 44, E21B 4706, G01K 1300

Patent

active

045752605

ABSTRACT:
For use with a sonde adapted to be lowered into a well borehole, the sonde supports a thermal conductivity probe response to well fluid thermal conductivity. In the preferred and illustrated embodiment, a four leg resistor bridge circuit has two temperature-sensitive legs exposed to well fluid. In addition, one such bridge leg is positioned adjacent to a heater dissipating constant heat power. The remaining leg is exposed to ambient well fluid. The bridge incremental voltage varies with the ambient temperature of the well fluid, but such ambient variations are compensated for by the remaining temperature-sensitive leg which causes nulling of ambient temperature changes. The heat transferred to the heated bridge leg determines the incremental voltage and, hence, the conductivity of fluid in the well bore can be measured.

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