Directional drilling system and method for drilling precise offs

Details Directional drilling system and method for drilling precise offs Directional drilling system and method for drilling precise offs

1990-10-19

1992-05-26

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

1661175, 166 50, 175 82, E21B 708

Patent

active

051158728

ABSTRACT:
A directional drilling apparatus for drilling offset wellbores from a main borehole using a steering tool to orient a guidance tool body and wherein the tool body has a pair of angularly intersecting passageways including a first smaller passageway that communicates with a packer, and a second larger passageway that cradles a smaller drill string for drilling the offset boreholes and wherein the smaller drill string will not fit in the first smaller passageway.

REFERENCES:
patent: 2669428 (1954-02-01), Zublin
patent: 2965182 (1960-12-01), Galeener
patent: 3191697 (1964-06-01), Haines
patent: 3336990 (1967-08-01), Warner et al.
patent: 4856666 (1989-08-01), Brunet et al.

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