Pressure equalized stabilizer apparatus for drill string

Details Pressure equalized stabilizer apparatus for drill string Pressure equalized stabilizer apparatus for drill string

1985-04-08

1986-08-19

Leppink, James A.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

Axially spaced opposed bore wall engaging guides

175325, E21B 710

Patent

active

046064176

ABSTRACT:
An elongated mandrel has enlargements adjacent each end with a reduced diameter mandrel section extending therebetween. A stabilizer member is supported on the mandrel section by bearing surfaces for relative rotation of the mandrel with a well string when the stabilizer member engages a well bore wall. Spaced seals and wipers between the mandrel and stabilizer member form a closed reservoir for receiving lubricant, and a passage that communicates with the reservoir and the well bore has a floating piston therein responsive to well bore pressure to equalize the well bore and reservoir pressure without exposing the lubricant in the chamber to well bore contaminants.

REFERENCES:
patent: 2065896 (1936-12-01), Keever
patent: 3007750 (1961-11-01), Cunningham
patent: 3007751 (1961-11-01), Eenink
patent: 3370657 (1968-02-01), Antle
patent: 4284154 (1981-08-01), England
patent: 4386667 (1983-06-01), Millsapps, Jr.
patent: 4408485 (1983-10-01), McGill

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