Tool for drilling curved sections of well holes

Details Tool for drilling curved sections of well holes Tool for drilling curved sections of well holes

E - Fixed Constructions

21

B

255/6

E21B 7/08 (2006.01) E21B 4/00 (2006.01) E21B 4/02 (2006.01) E21B 7/06 (2006.01) E21B 17/20 (2006.01)

Patent

CA 1157005

ABSTRACT OF THE DISCLOSURE The present invention relates to a tool for drilling curved sections of deep well holes by means of a drill bit operated by a downhole drive disposed and secured against rotation at the downhole end of the drill string. The angular deviation of the drill bit from the well axis being controlled by the drill string. A segment of the drill string is flexible in one plane only and comprises a series of individual link members pivotally secured to each other, the next to last link member of the downhole end of said drill string having a width dimension equal to the diameter of the drill bit with the deviation of the drill bit from the well axis being adjustable by controlling the pivotal position of the last link member of the drill string. The last member is located immediately adjacent the drill bit and forms a pivot bearing therefor. A drill tool according to the present invention allows more rapid transitions in direction than is possible with prior art structures.

381490

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