Downhole Pressure and Temperature Sensors
The downhole environment is very stressful to sensors. The following basic requirements were used during the development of the Analog and Digital Pressure/Temperature Sensors so that reliable data was assured.
Longevity. Sensor operation longevity is well-proven with Weatherford’s sensor technology. The overall life expectancy of the conveyed system depends on many environmental, handling, and wellbore conditions. Weatherford has considered and allowed for the ever-changing, unpredictability of the specific application by incorporating the following design principals.
Wide Operating Temperature Range. The sensor is capable of operating at a varying degree of surface and downhole conditions.
Repeatability. The sensor output, under pressure and temperature cycling of given input conditions, is the same each time the input conditions are applied.
Stability. Under constant pressure and temperature, the transducer output does not change.
Resistance to mechanical shock and vibration. The sensor produces minimal error during operation and has no long-term degradation.
Resistance to gases and liquids produced or injected downhole. The sensor is resistant to gases and liquids produced or injected downhole, whether naturally occurring (CO2, brine, H2S) or from well-treatment injection (acids, alkalis).
A comprehensive series of environmental stress tests ensure stringent criteria are met for thermal shock, mechanical shock, and thermal aging.
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