Inner pipe support arrangement for double-walled pipe

Details Inner pipe support arrangement for double-walled pipe Inner pipe support arrangement for double-walled pipe

E - Fixed Constructions

21

B

255/24

E21B 17/18 (2006.01)

Patent

CA 1167834

INNER PIPE SUPPORT ARRANGEMENT FOR DOUBLE-WALLED DRILL PIPE ABSTRACT A double-walled drill pipe, having a plurality of outer pipe lengths connected end-to-end and a plurality of inner pipe lengths connected end-to-end and concentrically disposed sith- in the outer pipes and defining an annular fluid flow passageway and a return flow passageway, is provided with an inner pipe support arrangement for minimizing stresses applied to the inner pipe lengths when blows are applied to the outer pipe lengths to drive a cutting bit. Each outer pipe length is provided with a ledge on its inner surface to provide a seat for an abutment on the outer surface of its adjacent inner pipe. When a blow is applied to the outer pipe lengths, the outer pipe is forced downwardly but due to inertial effects, the inner pipe unseats and is permitted to fall under its own weight. A resilient shock ring may be positioned on the ledge to cushion the fall of the inner pipe and provision may be made to limit axial displacement between the inner and outer pipes. dm:\

394652

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