Steerable drillhead

Details Steerable drillhead Steerable drillhead

1994-01-25

1996-05-07

Dang, Hoang C.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

175 61, E21B 708

Patent

active

055137130

ABSTRACT:
An apparatus for boring a continuous underground tunnel and located inside f the forward end of a continuously rotating, pushed drillstring includes a housing for receiving pressurized drilling fluid, a nozzle including bores, attached forwardly to the housing for discharging the pressurized drilling fluid from the nozzle, a rotatable valve located in said housing for receiving and forwardly directing pressurized drilling fluid from the housing to the nozzle. The valve may be rotated in a 1st position, thereby directing the pressurized drilling fluid to a first set of bores in the nozzle for boring straight ahead. The valve may also be rotated in a 2nd position, thereby directing the pressurized drilling fluid to a second set of bores. By maintaining the valve in the 1st position for 1/4 rotation of each revolution of the drillstring and then maintaining the valve in the 2nd position for the remaining 3/4 rotation of each revolution of the drillstring, an off axis (curved) tunnel may be bored.

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