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System for employing high temperature batteries for making measurements in a borehole

  • US 4,416,000 A
  • Filed: 04/12/1982
  • Issued: 11/15/1983
  • Est. Priority Date: 12/05/1977
  • Status: Expired due to Fees
First Claim
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1. A system for making measurements in an earth borehole having an improved power source, comprising:

  • downhole apparatus including means for sensing the magnitudes of one or more downhole parameters and generating signals representing the magnitudes of such parameters;

    equipment at the earth'"'"'s surface for detecting said signals and translating said detected signals into indications representative of the magnitudes of said downhole parameters;

    a battery within said downhole apparatus of a type that is operable only at temperatures substantially higher than those encountered in above-ground ambient air;

    a heat source for maintaining the temperature of said battery within its operable range; and

    a thermostat responsive to the battery temperature, said heat source and thermostat being connected to said battery whereby voltage supplied by said battery at least in part provides heat necessary to maintain said battery at operating temperatures during low ambient temperature conditions, said thermostat operating to remove battery voltage from said heat source when the ambient temperature is above a level which maintains said battery within its operable temperature range.

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