Drainhole drilling assembly and method

Details Drainhole drilling assembly and method Drainhole drilling assembly and method

1983-07-01

1985-06-18

Leppink, James A.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 73, E21B 708

Patent

active

045236526

ABSTRACT:
A bottomhole method and apparatus for drilling a curved borehole in the earth from a main bore to a lateral drainhole. The apparatus comprises a drill bit followed by a generally cone-shaped combination reamer and stabilizer tool extending to a knuckle joint, wherein the shape of the sidewall of the tool matches the shape of the curved borehole from the forward edge of the tool back to the knuckle joint. In operation, when the apparatus is deflected from the main bore, the drill bit is directed toward the top side of the borehole so as to drill a curved path. At the same time, stabilizing surface-to-surface contact is maintained between the curved sidewall of the reamer and the bottom side of the borehole, thus minimizing any tendency of the drill bit to deflect from the prescribed course and vary the prescribed angle of build.

REFERENCES:
patent: 2687282 (1954-08-01), Sanders
patent: 3398804 (1968-08-01), Holbert
patent: 4442908 (1984-04-01), Steenbock

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