Devices for drilling branched wells

Details Devices for drilling branched wells Devices for drilling branched wells

E - Fixed Constructions

21

B

255/6

E21B 7/06 (2006.01) E21B 17/00 (2006.01) E21B 17/07 (2006.01) E21B 41/00 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1276624

ABSTRACT OF THE DISCLOSURE A device for drilling lateral boreholes from a cased parent well comprises selecting and coupling means adapted to cooperate with a deflection unit placed within the parent well. The selecting and coupling means are mounted at the lower end of an extension unit formed by interassembled tubular elements. The upper end of the extension unit is rigidly fixed to a suspension swivel within the wellhead and at least one slip joint is interposed between two tubular elements. The internal diameter of each tubular element is such that a drilling packer can be housed within the tubular elements.

536068

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