Schlumberger

PressureXpress-HT High-Temperature Reservoir Pressure Service

The Qualification Process for PressureXpress-HT Service

The rigorous, extended qualification process for PressureXpress-HT service includes numerous tests conducted at a system level for the entire tool, as well as testing of individual components, electronics boards, and subassemblies. The design mission profile of PressureXpress-HT service is quantified, reliable tool operation under the full operational and environmental load, including high-temperature operations at up to 450 degF [232 degC]. The qualification process simulates the harshest situations equipment may experience during field operations, including transportation.

Quantified operating confidence

The result of these exhaustive qualification tests performed at the Schlumberger manufacturing center is increased reliability and quantified operating confidence at the maximum tool ratings:

  • shock
  • pressure-temperature cycling of sonde and electronics: more than 600 h of testing at various operating conditions, including 450 degF [232 degC] and 20,000 psi  
  • thermal cycling: –15 to 400 degF [–26 to 204 degC] for sondes, –15 to 350 degF [–26 to 175 degC] for electronics cartridges
  • thermal aging
  • cold storage: –15 degF [–26 degC] 
  • low- and high-temperature operations: –15 to 450 degF [–26 to 232 degC]
  • high-temperature life for 400 h: sonde at 400 degF [204 degC], electronics at 350 degF [175 degC]
  • shock transmissibility. 

Extended reliability testing

The design qualification process for PressureXpress-HT service concludes with extended reliability testing, during which the tools are subjected to a lengthy operational test under cycles of temperature, power, functional load, and shock. An extensive database compiled from the reliability tests is used to predict system or component failure and define preventative maintenance events for the tool. Each tool is similarly subjected to extremely rigorous temperature, pressure, shock, and vibration testing as part of the design criteria and again before each tool is sent to a field operating base.

Defined preventive maintenance

To sustain quantified operating confidence in each tool, preventive maintenance procedures and steps have been defined for field operations implementation, providing the most reliable tool each and every job.

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Pressure Measurement with
No Thermal Effects

PressureXpress-HT Case Study image
Although thermal effects distort conventional measurements (green) from the Gulf of Thailand, measurements from PressureXpress-HT high-temperature reservoir pressure service (red) are immune thanks to superior thermal stability of the tool, with no gauge stabilization necessary.
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