Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1976-11-10
1978-10-24
Purser, Ernest R.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 75, 299 33, E21B 704
Patent
active
041216733
ABSTRACT:
A system for drilling and simultaneously installing a relatively large production casing along an invert underground arcuate path beneath an obstacle is disclosed. A plurality of production casing segments, each having preformed curvature corresponding to the radius of the curvature of the arcuate path, are joined end to end and advanced along the desired path. A drill head is located in front of the leading end of the casing. The drill head is mounted to the casing so that the angular orientation of the drill head relative to the axis of the leading end of the casing is at least partially adjustable. A drill bit is located in front of the drill head and a motor is located within the drill head to drive the drill bit. The drill bit excavates a passageway along the arcuate path in advance of the casing. The angular orientation of the drill head relative to the axis of the leading end of the casing is controlled so that the passageway is excavated along the preselected arcuate path and the casing is simultaneously installed along that path.
REFERENCES:
patent: 2565794 (1951-08-01), Young
patent: 3280923 (1966-10-01), Muench
patent: 3356167 (1967-12-01), Trent
patent: 3465834 (1969-09-01), Southworth, Jr.
patent: 3713500 (1973-01-01), Russell
patent: 3857449 (1974-12-01), Kimura
patent: 3938597 (1976-02-01), Richmond et al.
patent: 3967463 (1976-07-01), Grandori
Favreau Richard E.
Purser Ernest R.
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