Means for reducing bending stresses in drill pipe

Details Means for reducing bending stresses in drill pipe Means for reducing bending stresses in drill pipe

1985-08-27

1987-06-23

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

175 61, 175 76, E21B 704, E21B 1710

Patent

active

046745807

ABSTRACT:
A means for substantially reducing the bending stresses, both tensional and compressional, in a standard-type length of drill pipe as it passes through a section of a wellbore that is deviated from vertical. The tool joints on the ends of drill pipe have outside diameters greater than that of the pipe body which act as supports for the pipe body against the wall of the wellbore in a deviated section. The bending stresses encountered by the drill pipe increase as the distance between these pipe supports increase. In the present invention, stress sleeves are affixed to the outer surface of the pipe body at equally spaced intervals between the tool joints to act as dummy tool joints thereby providing additional pipe supports which substantially reduce the bending stresses in the drill pipe.

REFERENCES:
patent: 2877062 (1959-03-01), Hall et al.
patent: 4428441 (1984-01-01), Dellinger
patent: 4577701 (1986-03-01), Dellinger et al.

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