| 摘要 |
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 means selectively operable for sealingly engaging a well bore. Upon sealing engagement of the pad means 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 means 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 means. A choke delays the application of pressure to the piston until after the pad means seals on the wall of the well bore. When a fluid sample is desired, the fluid pressure used to actuate the pad means is increased to operate a first valve means which connects the pad means of a water cushion sampling chamber. After a fluid sample is collected, the fluid pressure is further increased to operate a second valve means which closes off the sampling chamber. When the formations are unconsolidated a slidable probe in the pad means extends outwardly into the wall and forms a mechanical filter. When the probe retracts the filter is self-cleaning.
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