Platinum Resistance Thermometer


Determines borehole fluid temperature


  • Discovering fluid entry, gas leaks, injection zones, and fluid movement behind pipe
  • Locating cement tops


  • The compact tool profile reduces total tool-string length.
  •  The platinum resistance thermometer (PRT) can be used with other Ultrawire™ production logging tools for simultaneous measurements and increased operational efficiency.


  • Responds quickly to temperature changes for accurate measurement
  • Works well in applications where there are tool-string limitations, such as offshore operations

Tool Description

The platinum resistance thermometer (PRT) determines borehole fluid temperature by measuring the resistance of a platinum probe. A pressure-tight Inconel® needle contains the probe and protrudes into an open slot through which borehole fluid flows. The measurements from the low-mass probe provide high-resolution data with fast temperature response.