Tool for testing earth formations in boreholes

Details Tool for testing earth formations in boreholes Tool for testing earth formations in boreholes

1980-05-05

1981-10-06

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4900

Patent

active

042928427

ABSTRACT:
A tool for testing earth formations in bore-holes provides a failsafe function for retracting the sealing pad of the formation isolation device, in the form of elements operable in response to failure of down-hole power supply for the tool to effect release of hydraulic setting pressure on the seal pad. The tool further provides a formation mini-sample chamber of variable volume with elements permitting aboveground monitoring and control of same independently of any other tool function. The mini-sample chamber control device also controls the operation of a formation fluid sample flow line valve. The tool is divided into upper and lower pivotable sections to alleviate the problem of becoming differentially stuck. A unique pivot structure incorporating sample chamber seal valve assembly, is provided. A unique sand screen device is provided to permit the tool to function when working with unconsolidated formations.

REFERENCES:
patent: 3577782 (1971-05-01), Aitken
patent: 3782191 (1974-01-01), Whitten

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