Measuring and testing – Borehole or drilling – Downhole test
Patent
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
Archambeau, Jr. Ernest R.
Moore Stewart F.
Myracle Jerry W.
Schlumberger Technology Corporation
Sherman William R.
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