Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1990-12-03
1992-01-28
Dang, Hoang C.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
166 551, 166242, 267125, 267137, 464 21, E21B 1707
Patent
active
050836234
ABSTRACT:
A shock absorber apparatus for inclusion in a tool string which consists of outer and inner casings telescopically assembled with one casing having an uphole threaded joint member and the other casing having a downhole threaded joint member. The concentric casings then define spaced, sealed voids communicating through a metering sleeve clearance that are filled with a compressible oil. Shock wave induced relative movement of the casings from either direction causes a shock absorbing instantaneous displacement of oil from one void to the other via the metering clearance. Alternatively, coil springs may be disposed in the voids to aid in shock absorption.
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Dang Hoang C.
Duzan James R.
Halliburton Company
Hessin Robert E.
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