Method of assembling multiple wall drill pipe

Details Method of assembling multiple wall drill pipe Method of assembling multiple wall drill pipe

1980-07-07

1982-07-06

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Assembling or joining

29455R, 138148, 175215, 277 1, B23P 1102

Patent

active

043375634

ABSTRACT:
Multiple wall drill pipe adapted for use in a drill pipe string comprising an outer pipe member; an inner pipe member disposed within the outer pipe member; and means for releasably connecting the inner pipe member and the outer pipe member in fixed axial relationship under force loads applied in use during a drilling operation while enabling relative rotary movement between the inner pipe member and the outer pipe member during a rotary drilling operation to relieve torsional stress thereon, and for permitting the removal of the inner pipe member from the outer pipe member by relative axial displacement therebetween caused by application to the inner pipe member of only an axially directed force load in excess of the axially directed force loads applied to the inner pipe member in use during a normal drilling operation.

REFERENCES:
patent: 1930285 (1933-10-01), Robinson
patent: 2738992 (1956-03-01), Heisler
patent: 2895512 (1959-07-01), Forsyth et al.
patent: 3332446 (1967-07-01), Mann
patent: 3487534 (1970-01-01), Schustack
patent: 3503636 (1970-03-01), Bower
patent: 3552778 (1971-01-01), Muller
patent: 3639972 (1972-02-01), Schelin et al.

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