HPHT filtration test — Oil & Gas Glossary
A test to measure static filtration behavior of water mud or oil mud at elevated temperature, up to about 380°F [193°C] maximum (450°F [227°C] maximum if a special cell is used), usually according to the specifications of API. Although the test can simulate downhole temperature conditions, it does not simulate downhole pressure. Total pressure in a cell should not exceed
Detailed Explanation
700 psi [4900 kPa], and the differential pressure across the filtermedium is specified as 500 psi [3500 kPa]. Because these cells are half the size of the ambient filtration area, HPHTfiltrate volumes after 30 minutes are doubled.