Apparatus for lateral drain hole drilling in oil and gas wells

Details Apparatus for lateral drain hole drilling in oil and gas wells Apparatus for lateral drain hole drilling in oil and gas wells

1990-05-09

1992-09-22

Novosad, Stephen J.

Boring or penetrating the earth

Tool shaft advanced relative to guide insertable in...

175 62, 175320, 175323, E21B 708, E21B 1720, E21B 1722

Patent

active

051488779

ABSTRACT:
Apparatus for drilling horizontal drain holes from within existing wellbores is comprised of a flexible rotary drillstring made from a plurality of arcuate elements tightly drawn along a central cable, and of driving and redirecting apparatus to rotate and deflect the drillstring. The elements, engaged to the cable, provide a stiff drillstring which, combined with the rotary drive at the well bottom, permits extensive drilling. A deflection block, precisely fitted to the drillstring and to other apparatus requirements, enables the drilling functions. An alternate drillstring has cylindrical interlocking elements with internal alignment means.

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