Apparatus for determining downhole fluid temperatures

A sensor for measuring downhole fluid temperatures, comprising:

• a first electrode coupled to a housing and disposed within a fluid chamber;
• a second electrode coupled to the housing and disposed within the fluid chamber;
• a viscometer wire electrically coupled to the first and second electrodes;
• a temperature sensor disposed outside of the fluid chamber;
• and
• a fluid thermometer electrically coupled to the first and second electrodes and to the temperature sensor to determine a temperature of a fluid within the fluid chamber.

A sensor for measuring downhole fluid temperatures, comprising:

• a first electrode comprising a first material, sealingly coupled to a fluid chamber, and thermally coupled to downhole fluid in the fluid chamber;
• a second electrode comprising a second material and in contact with the first electrode to form a thermocouple;
• a temperature sensor disposed outside of the fluid chamber;
• and
• a fluid thermometer electrically coupled to the first and second electrodes and to the temperature sensor to determine a temperature of the downhole fluid in the fluid chamber.

A system for measuring a temperature of a downhole fluid, comprising:

• a downhole tool having a temperature sensor, the temperature sensor comprising:
• a sensing element for measuring a physical or chemical property of the downhole fluid;
• and
• a plurality of electrical connections to enable the sensing element to measure the chemical or physical property and provide an output signal representative of the chemical or physical property, wherein at least one of the electrical connections is configured to function as a thermocouple to sense a temperature of the downhole fluid.