Drilling string shock-absorbing tool

Details Drilling string shock-absorbing tool Drilling string shock-absorbing tool

1974-07-11

1976-04-06

Brown, David H.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

64 23, E21B 17042

Patent

active

039491501

ABSTRACT:
A shock absorbing tool is provided having a low spring rate deformable element disposed in an oil bath in a sealed, annular chamber formed between the barrel and mandrel. One of the chamber seals is a floating seal, exposed to the drilling fluid outside the tool so that the pressure within the chamber is equalized with the hydrostatic bottom hole pressure. As a result, the tool is not pre-loaded, when lowered to the bottom of the well bore, leaving the most effective shock-absorbing capability of the element available to absorb the axial thrusts of the drilling bit.

REFERENCES:
patent: 2240519 (1941-05-01), Reed
patent: 2991635 (1961-07-01), Warren
patent: 3254508 (1966-06-01), Garrett
patent: 3301009 (1967-01-01), Coulter
patent: 3345832 (1967-10-01), Bottoms
patent: 3383126 (1968-05-01), Salvatori et al.
patent: 3400558 (1968-09-01), Haines
patent: 3406537 (1968-10-01), Falkner
patent: 3472326 (1969-10-01), Sutliff et al.
patent: 3539026 (1970-11-01), Sutliff et al.
patent: 3660990 (1972-05-01), Zerb et al.

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