E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/28
E21B 17/10 (2006.01) B23P 11/00 (2006.01) B26F 3/00 (2006.01) E21B 17/00 (2006.01)
Patent
CA 1189851
ABSTRACT: A drill pipe comprises a tube, a tool joint at each end of the tube, each tool joint having a larger outer diameter than the tube, a fractured sleeve having an internal diameter smaller than the external diameter of the tool joints but slightly larger than the outer diameter of the tube welded together about the tube, and adhesive cement between the sleeve and tube affixing the sleeve to the tube. The sleeve is fractured by forming a plurality of external longitudinal grooves therein not in excess of 180 degrees apart circumferentially, cooling the sleeve to at least the ductile-brittle transition temperature, placing the sleeve on a split tubular internally tapered mandrel, and forcing a wedge into the mandrel with a hammer blow to fracture the sleeve along said grooves into a plurality of segments. The segments are positioned with the fractured surfaces aligned to reform the sleeve about the tube in the desired axial position therealong and the segments are then welded together by filling in the grooves with weld metal.
420246
Smart & Biggar
Smith International Inc.
LandOfFree
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