Oilfield Glossary

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Note: Definitions provided on this website are for reference purposes only. Engineers and professionals should independently confirm all information using industry standards.

Formation tester

A formation tester (like M-Dyanmics or MDT) is a wireline tool that presses a probe against the borehole wall to measure formation pressure and take fluid samples.

It provides critical data on reservoir pressure gradients (to determine fluid contacts) and recovers pure reservoir fluid for PVT analysis.

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