Earth drilling apparatus and method

Details Earth drilling apparatus and method Earth drilling apparatus and method

E - Fixed Constructions

21

B

255/7

E21B 7/08 (2006.01) E21B 7/18 (2006.01) E21B 43/24 (2006.01)

Patent

CA 1221085

Abstract of the Disclosure Apparatus for forming a bore hole in an underground formation including a guide pipe with a fluid seal and a tube sealed with the seal and terminating in a drillhead with at least one fluid exit port. The tube moves out the exit end of the guide pipe into the formation under hydraulic pressure applied against the drillhead. The bottom of the guide tube includes a whipstock to turn the drillhead, from a vertical to a horizontal direction, to form a radial. The whipstock includes a number of connected assemblies which, when extended from a retracted position within the structure, form an arcuate tube-bending guideway including rotatable sheaves.

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