Hydraulic shock absorber with nitrogen stabilizer

Details Hydraulic shock absorber with nitrogen stabilizer Hydraulic shock absorber with nitrogen stabilizer

1991-01-16

1992-07-28

Melius, Terry L.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

166242, 464 26, E21B 1707, F16F 900

Patent

active

051334194

ABSTRACT:
A shock absorber device for inclusion in a tool string to provide rapid shock dissipation for shock forces traveling up or down the string. The device includes a tubular mandrel and an outer casing that forms an annular chamber therearound. At least one annular piston and one or more metering sleeves are formed integral with the outer casing and function to divide the annular chamber into a plurality of annular chambers that are filled with either nitrogen gas or silicone oil under selected pressures. Thus, the mandrel supports the lower tool string resiliently due to the fluid supported annular pistons such that any shock wave traveling along the tool string will be rapidly dissipated at the fluid piston interfaces.

REFERENCES:
patent: 2577599 (1951-12-01), Bethancourt
patent: 3714831 (1973-02-01), Quichaud et al.
patent: 3998443 (1976-12-01), Webb
patent: 4055338 (1977-10-01), Dyer
patent: 4628995 (1986-12-01), Young et al.
patent: 4693317 (1987-09-01), Edwards et al.
patent: 4817710 (1989-04-01), Edwards et al.
patent: 4844181 (1989-07-01), Bassinger

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