Formation testers

Details Formation testers Formation testers

1978-05-22

1980-07-01

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

166100, E21B 4900

Patent

active

042100186

ABSTRACT:
A formation tester apparatus for use in a well bore for multiple testing of pressures of earth formation fluids and the taking of a fluid sample, including pad and shoe elements selectively operable for sealingly engaging a well bore. Upon sealing engagement of the pad element with the wall of a well bore, a fluid sample is ingested into an expanding chamber while its pressure is sensed. Upon completion of the pressure test, the pad element is retracted from the wall of a well bore, and the expanding chamber contracts to expel the fluid sample. The pressure test may be repeated any number of times. The expanding chamber includes a piston operated with fluid pressure used to actuate the pad element. A choke delays the application of pressure to the piston until after the pad element seals on the wall of the well bore. When a fluid sample is desired, the fluid pressure used to actuate the pad element is increased to operate a first valve element which connects the pad elements of a water cushion sampling chamber. After a fluid sample is collected, the fluid pressure is further increased to operate a second valve element which closes off the sampling chamber. When the formations are unconsolidated a slidable probe in the pad element extends outwardly into the wall and forms a mechanical filter. When the probe retracts the filter is self-cleaning.

REFERENCES:
patent: 3611799 (1971-10-01), Davis
patent: 3677081 (1972-07-01), Newton et al.

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