Downhole tool, including shock absorber

Details Downhole tool, including shock absorber Downhole tool, including shock absorber

1989-08-22

1990-06-12

Novosad, Stephen J.

Wells

With time or distance measuring, temperature responsive or...

166 651, 166113, 175 40, 267125, E21B 1707, E21B 2310, E21B 4706

Patent

active

049324713

ABSTRACT:
In a preferred embodiment, an eletronic temperature gauge is carried into a well bore within a pressure-sealed housing which can free fall through a drill string to impact upon a drill bit connected at the bottom of the drill string. A shock absorber is connected at the bottom of the housing to absorb the shock upon impact of the apparatus on the drill bit. The shock absorber has a relatively linearized shock absorbing response in the preferred embodiment. Additional structural features provide further cushioning of the gauge during transit and upon impact.

REFERENCES:
patent: 2176766 (1939-10-01), Johnston
patent: 2576924 (1951-12-01), Coberly
patent: 2577599 (1951-12-01), Bethancourt
patent: 3381780 (1968-05-01), Stachowiak
patent: 4149593 (1979-04-01), Gazada et al.
patent: 4223746 (1980-09-01), Tanguy et al.
patent: 4585099 (1986-04-01), Taylor
patent: 4665398 (1987-05-01), Lynch et al.
patent: 4679669 (1987-07-01), Kalb et al.
patent: 4693317 (1987-09-01), Edwards et al.
A TOTCO Brochure entitled "Drift Indicators" believed to be more than one year prior to Aug., 1989, (note 1984 copyright notice).

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