Wireline formation tester Definition


Wireline formation tester:

A formation fluid sampling device, actually run on conductor line rather than wireline, that also logs flow and shut-in pressure in rock near the borehole.

A spring mechanism holds a pad firmly against the sidewall while a piston creates a vacuum in a test chamber.

Formation fluids enter the tes5t chamber through a valve in the pad.

A recorder logs the rate at which the test chamber is filled.

Fluids may also be drawn to fill a sampling chamber.

Wireline formation tests may be done any number of times during one tip in the hole, so they are very useful in formation testing.