Device for measuring the stresses applied in use to the downhole

Details Device for measuring the stresses applied in use to the downhole Device for measuring the stresses applied in use to the downhole

1979-10-19

1981-10-13

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

73151, 7386235, 175 40, E21B 4700

Patent

active

042943183

ABSTRACT:
This device comprises a resilient stress-responsive member interconnecting two conduits which can be respectively coupled to upper and lower portions of the downhole assembly, and are surrounded by a protecting sleeve making up with one of said conduits, the lateral walls of an annular space. Annular elements secured to a first of said lateral walls, and slidable on the second of said lateral walls, form the end walls of said space and an intermediate annular piston integral with the second lateral wall, and slidable on the first lateral wall, divides the annular space into two annular chambers communicating respectively with the inner and outer spaces of the downhole assembly of the drill string, and having operative cross sections selected so as to compensate for the axial loads due to the hydrostatic pressure and bottom effect applied to the stress-responsive member.

REFERENCES:
patent: 3311180 (1967-03-01), Gilreath et al.
patent: 3319726 (1967-05-01), Brown
patent: 3329221 (1967-07-01), Walker
patent: 3447340 (1969-06-01), Garrett
patent: 3664184 (1972-05-01), Dyer
patent: 3686942 (1972-08-01), Chatard et al.
patent: 3696332 (1972-10-01), Dickson, Jr. et al.
patent: 3855853 (1974-12-01), Claycomb
patent: 3876972 (1975-04-01), Garett

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