Multiple wall drill pipe

Details Multiple wall drill pipe Multiple wall drill pipe

E - Fixed Constructions

21

B

255/24

E21B 17/00 (2006.01) E21B 17/18 (2006.01)

Patent

CA 1101404

ABSTRACT OF THE DISCLOSURE Multiple wall drill 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 loads applied to the inner pipe member in use during a normal drilling operation.

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