Telescopable boring rod mechanism

Details Telescopable boring rod mechanism Telescopable boring rod mechanism

E - Fixed Constructions

21

B

E21B 17/07 (2006.01) E21B 17/00 (2006.01)

Patent

CA 2456899

The invention relates to a telescopable boring rod mechanism with at least two mutually displaceable Kelly rods, which are equipped with means for transmitting a torque to the adjacent Kelly rod. At least one of the Kelly rods is constructed from at least two rod segments, which are made from a different material.

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