Means and method of drilling wells

Details Means and method of drilling wells Means and method of drilling wells

E - Fixed Constructions

21

B

255/50, 255/8

E21B 10/00 (2006.01)

Patent

CA 1049492

ABSTRACT A means and method of drilling wells wherein the casing and. tubing string are rotated with minimum interr- uption and are moved downwardly simultaneously. A bit assembly, capable of cutting a bore larger than the casing is lowered and raised through the drill string, the bit assembly being pivotable between a position in which the transverse axis is in alignment with the drill string bore for movement therein and a drilling position in which its longitudinal axis is transverse to the axis of the drill string and surrounding casing and extends radially beyond the casing for drilling operation; the lower end of the drill string and bit assembly having interlocking parts to transmit rotational force from the drill string to the bit assembly.

250940

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