Wireline Formation Test

Definition - What does Wireline Formation Test mean?

A Wireline Formation Test is the test conducted by a wireline formation tester to measure the wireline formation pressure. This test is carried out by inputting an instrument probe inside the borehole wall and performing a mini draw down and buildup by withdrawing a small amount of formation fluid. The worker then waits for the pressure to build up to the formation pore pressure.

Petropedia explains Wireline Formation Test

All types of formation testers fall in the category of wireline tools which are used to measure the downhole pressure of formations. Formation testers are helpful in providing wireline formation test results. Stationary measurements of formation pressure in an open hole are made at any number of depths during a single trip into the hole. These pressure measurements are useful in determining:

  • Variations in pressure among various formations.
  • Gradients of fluid pressure within a formation that can indicate fluid content.
  • Gas-oil or water-oil contacts.
  • Local permeability.
Comparison with initial reservoir pressures in development wells may indicate zonal pressure depletion. Formation testers are also used to retrieve samples containing fluids.
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