Positioning deflection wedges

Details Positioning deflection wedges Positioning deflection wedges

E - Fixed Constructions

21

B

255/7

E21B 7/08 (2006.01) E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 21/10 (2006.01) E21B 23/04 (2006.01)

Patent

CA 1113081

ABSTRACT OF DISCLOSURE A deflection wedge is positioned in a long horizontal drill hole by securing it with a shear pin to an extension on a drill string. The extension is turned independently of the drill string to enable a droparm mechanism to actuate a trigger which stops rotation at a predetermined orientation. Rotation is effected by means of a rifle bar mechanism. In one case the rifle bar presses against the bottom of the hole to cause rotation and the trigger declutches the rifle nut when the droparm drops. In another case hydraulic pressure pushes a rifle bar from the drill string into a nut on the extension and the trigger causes a valve to close which causes water lock and thus prevents further movement of the piston and rotation of the extension.

321512

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