Shock isolation sub for use with downhole explosive actuated too

Details Shock isolation sub for use with downhole explosive actuated too Shock isolation sub for use with downhole explosive actuated too

1991-12-09

1993-02-23

Britts, Ramon S.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

E21B 1707

Patent

active

051881918

ABSTRACT:
The present disclosure is directed to a shock absorbing device for threading in a tubing string for running delicate instruments into a well borehole where they are in near proximity to explosives which might otherwise be detonate. This particularly is important in a well borehole which is filled with a standing column of liquid which transmits the shock waves quite readily. This is a separate assembly which can be threaded in the tubing string and has a pin and box connection for that. Moreover, it is formed of an outer mandrel surrounding connected inner upper and inner lower mandrels; the inner mandrels define annular spaces for receiving shock absorbers defined by alternating thin layers of metal and rubber; the metal and rubber washers have different shock wave impedances and tend therefore to absorb shock waves traveling either upwardly or downwardly in the well borehole.

REFERENCES:
patent: 4133516 (1979-01-01), Jurgens
patent: 4139994 (1979-02-01), Alther
patent: 4186569 (1980-02-01), Aumann
patent: 4194582 (1987-05-01), Ostertag
patent: 4281726 (1981-08-01), Garrett
patent: 4552230 (1985-11-01), Anderson et al.
patent: 4693317 (1987-09-01), Edwards et al.
patent: 4779852 (1988-10-01), Wassell

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