SOME INVESTIGATIONS ON HYDRODYNAMICS OF WIRELINE FORMATION TESTERS
Devoted to the 50-th anniversary of Formation Testing Section, VNIIGIS An approximated solution for the problem on transient spherically-radial liquid filtration when sampling it from a variable output formation has been presented. The results of this solution pertaining to the closed vessel of a wireline formation tester (OPK) have been analyzed. A formation thickness effect on the behavior of inflow into the wireline formation tester and pressure curves recorded has been investigated.