Hydraulic shock absorber

Details Hydraulic shock absorber Hydraulic shock absorber

F - Mech Eng,Light,Heat,Weapons

16

F

F16F 9/00 (2006.01) E21B 17/00 (2006.01) E21B 17/07 (2006.01)

Patent

CA 2056561

A shock absorber apparatus for inclusion in a tool string which consists of outer and inner casings telescop- ically 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 displace- ment 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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