APPARATUS FOR DRILLING STRAIGHT PORTION OF A DEVIATED HOLE

摘要

APPARATUS FOR DRILLING STRAIGHT PORTION OF A DEVIATED HOLE A guide for drilling a straight section of a bore hole deflected from the vertical. The apparatus comprises either a normally straight or a curved-straight tubular member which has a plurality of generally circumferential cuts disposed along the length of the guide. The cuts allow the guide to be bent sufficiently to enter and traverse a short radius curve and then return to its normal configuration for guiding the drilling of the straight portion of the deflected bore hole. A clutch mechanism disposed in the drill guide permits engagement of the guide by the drill string for orientation of the guide.