High Pressure, High Temperature (HPHT)

High Pressure, High Temperature (HPHT) is the term used to define:

- Wells that have high pressure or high temperature

- Wells that have a pressure greater than 15,000 psi (103MPa)

- Wells whose temperature is greater than 350 degrees F (177 degrees C)

- High pressure wells that require well control equipment to have a rated working pressure of more than 15,000 psi

- A well in which the fluid flows at a temperature greater than 350 degrees F at the surface

In reality, very few wells operate under HPHT simultaneously. Most wells operate at high pressure or high temperature but are still referred to as HPHT Wells.

Some shallow wells can be found operating under high temperature conditions due to:

- Wells drilled close to local geothermal hotspots will operate at abnormally high temperatures

- Wells drilled close to other wells that use steam injection to reduce the viscosity of heavy oil will have a higher reservoir temperature than normal because the injected steam will raise the temperature of the surrounding formations

To avoid poor performance & failure in the HPHT environment:

- The metal used is carefully selected

- Equipment must be pressure tested to ensure the seal can withstand high pressure to prevent leakage

- Fluid density should always be checked

- A cooling system must be installed before pumping the drilling fluid back into the hole

- Water-based sludge must always be adapted to the HPHT environment

Information: https://www.samson-tiara.co.id/Course/HPHT-High-Pressure-High-Temperature-Drilling-Operations/

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