Connection of drill tubes

Details Connection of drill tubes Connection of drill tubes

F - Mech Eng,Light,Heat,Weapons

16

L

285/43, 166/62,

F16L 13/00 (2006.01) E21B 17/043 (2006.01)

Patent

CA 1199353

ABSTRACT "CONNECTION OF DRILL TUBES" The invention provides a method of joining two rigid tubes such as are used in drill stems wherein a nipple internal to the tubes is threaded and screws into at least one of the tubes, the nipple provided with a zone of reduced internal diameter which registers with a cavity in the internal bore of the tube and the zone of reduced internal diameter expanded outwards into contact with the tube to occupy the registering cavity in the tube and form a positive lock against tensile forces.

411737

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