Method and apparatus for earth boring

Details Method and apparatus for earth boring Method and apparatus for earth boring

E - Fixed Constructions

21

B

255/12

E21B 4/00 (2006.01)

Patent

CA 1047024

METHOD AND APPARATUS FOR EARTH BORING Abstract of the Disclosure Method and apparatus for earth boring using a rotary drilling rig and drilling string for mounting a bottom hole electrical motor to rotate a drill bit to form the borehole. Electrical power from an electrical power source at the earth surface is communicated to the electric motor by conductor lines positioned in the bore of the drill string and having releasable supporting connectors to enable adding and removing of lengths of conductor lines as desired. An electrical conductor swivel unit is mounted in the dril- ling string to enable rotation of the drilling string while operating the electric motor and an extendable electrical connector is provided in the kelly to compensate for varia- tion in conductor lengths while effecting electrical contact with the conductors. I

235048

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