Wireline formation tester:

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.

Terms Related to Wireline formation tester

• Drill stem test (dst)

  The conventional method of formation testing. The basic drill stem test tool consists of a packer or packers, valve or ports that may be opened ...

• Stuffing box

  A device that prevents leakage along a piston, rod, propeller shaft, or other moving part that passes through a hole in a cylinder or vessel. ...

• Formation testing

  The gathering of pressure data and fluid samples from a formation to determine its production potential before choosing a completion method. Testing tools include formation ...

• Formation competency test

  A test used to determine the amount of pressure required to cause a formation to fracture.

• Bullheading

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• Absolute permeability

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• Blowout

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