Tool joint stress relief groove

Details Tool joint stress relief groove Tool joint stress relief groove

1993-05-20

1994-10-18

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

285114, E21B 17042, E21B 1720, F16L 1500

Patent

active

053559681

ABSTRACT:
A pipe body is provided having an upset portion and connecting to a tool joint to form a relatively rigid region. A stress relief groove is provided in this relatively rigid region of the tubular member to limit stress applied in the pipe body adjacent the upset portion by rotation of the pipe while the pipe is in an arcuate portion of a well bore. The stress relief groove is designed to increase flexibility of this relatively rigid region while providing that the anticipated stress to be applied in the relatively rigid section is less than the endurance limit in the locus of the stress relief groove.

REFERENCES:
patent: 2205697 (1940-06-01), Scharpenberg
patent: 2676820 (1954-04-01), Boice
patent: 3152458 (1964-10-01), Simonin
patent: 3730286 (1973-05-01), Weiner
patent: 4076436 (1978-02-01), Slator et al.
patent: 4892337 (1990-01-01), Gunderson et al.
G. E. Wilson, "A New Tool Joint Design Increases the Fatigue Life of Drillpipe Tubes." Publication of paper presented at SPE/IADC Drilling Conference, Amsterdam, Feb. 23-25, 1993, pp. 893-898.

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