Method and device for joining well tubulars

Details Method and device for joining well tubulars Method and device for joining well tubulars

E - Fixed Constructions

21

B

26/74

E21B 33/00 (2006.01) B23K 20/12 (2006.01) E21B 17/08 (2006.01) E21B 19/16 (2006.01) F16L 13/02 (2006.01)

Patent

CA 2015844

Joining of well tubulars is done by a friction welding technique involving lowering a first tubular element (3) partly into a well, positioning a welding ring (5) on top of this element (3), hoisting a second element (4) to a substantially vertical position above the welding ring (5) and rotating the welding ring (5) relative to the tubular elements (3 and 4) while deforming the welding ring (5) in radial sense such that sufficient frictional heat is generated to create a friction weld between the welding ring (5) and the tubular elements (3 and 4). A friction welding device for use in the method comprises means for fixing the tubular elements (3 and 4) in a substantially vertical and aligned position near the wellhead and means for rotating the welding ring (5) relative to the tubular elements (3 and 4).

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