Definition(s)
High-Pressure, High-Temperature Well
Wells with a potential pressure greater than 15,000 psi (103.42MPa) at the wellhead or with a potential flowing temperature of greater than 350 °F (177 °C) at the wellhead.
Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards