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HPHT: In a range of 10,000–15,000 psi, or a pore pressure of at least 0.8 psi/ft, temperatures of at least 300°F up to 350°F.
Extreme HPHT: 15,000–20,000 psi, 350–400°F.
Ultra-HPHT: Greater than 20,000 psi and 400°F.
The surprising thing is that the oil and gas industry would even need to bother defining anything beyond regular ol’ high-pressure/high-temperature. Pressures and temperatures of 10,000 psi and 300°F are awe-inspiring, flabbergasting conditions for anything. And yet, that’s where operators are headed.
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