Method and device for joining well tubulars

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

1990-05-11

1991-12-10

Heinrich, Samuel M.

Metal fusion bonding

Process

Using dynamic frictional energy

228231, 228 2, 228 445, 228 48, B23K 2012

Patent

active

050710532

ABSTRACT:
This invention relates to a method and device for joining well tubulars by a friction welding technique. The device includes apparatus for fixing tubular elements in a substantially vertical and aligned position near the wellhead and apparatus for rotating a welding ring relative to the tubular elements. According to the method a first tubular element is lowered partly into the well, positioning a welding ring positioned on top of this element hoisted to a substantially vertical position above the welding ring and the welding ring rotated relative to the tubular elements while the welding ring is deformed in a radial direction such that sufficient frictional heat is generated to create a friction weld between the welding ring and the tubular elements.

REFERENCES:
patent: 3934780 (1976-01-01), Flax
patent: 4063676 (1977-12-01), Lilly
patent: 4605151 (1986-08-01), Brown

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