Formation-testing apparatus

Details Formation-testing apparatus Formation-testing apparatus

1975-01-22

1976-01-27

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4710

Patent

active

039344681

ABSTRACT:
In the representative embodiment of the new and improved formation-testing apparatus disclosed herein, a wall-engaging sealing pad is arranged around the forward end of a normally open tubular probe which is adapted to be placed in communication with an adjacent earth formation and carries an extendible filter probe coaxially supported therein by a tubular valve member. If a formation being tested is relatively incompetent, the filter probe will be advanced into the formation without allowing further erosion of loose formation materials with the valve member acting to block communication through the outer probe. Alternatively, should a formation being tested be relatively competent, the filter probe will remain in its normal retracted position and the valve member will cooperatively block communication through the filter probe and instead provide an unrestricted flow passage through the outer probe to a sample-collecting system on the apparatus.

REFERENCES:
patent: 3254531 (1966-06-01), Briggs, Jr.
patent: 3677080 (1972-07-01), Hallmark

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