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high-pressure, high-temperature filtration test

1. n. [Drilling Fluids]

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 700 psi [4900 kPa], and the differential pressure across the filter medium is specified as 500 psi [3500 kPa]. Because these cells are half the size of the ambient filtration area, HPHT filtrate volumes after 30 minutes are doubled.

Synonyms: static filter press

Antonyms: low-pressure, low-temperature filtration test

Alternate Form: HPHT filtration test

See: electrical stability testfiltercakefilter pressfilter-cake thicknessfiltrate volumefluid-loss controlfluid-loss-control materialgeothermal gradienthigh-pressure, high-temperaturejar testparticle-plugging apparatussintered

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