Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent
1990-08-31
1992-09-22
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
With fluid conduit lining or element
175 73, 175398, 175400, 175424, E21B 708, E21B 1060, E21B 1062
Patent
active
051488809
ABSTRACT:
A method and apparatus for drilling a horizontal controlled borehole in the earth includes a drill frame, a drill string and a downhole tool. The drill frame includes a wrench attached to the frame for assisting in breaking and forming joints. The downhole tool includes removable blade assemblies having, for example, stepped or spade-like profiles and hard facing at areas of primary contact with the soil. When fluid is added for cooling, lubricating and flushing away cuttings, the downhole tool can include a nozzle parallel to the centerline of the longitudinal axis of the drill string, a check valve means for preventing downhole particles from entering the fluid passageway and/or a transmitter protecting waterproof plug for diverting fluid to a fluid passageway and for allowing an on-board downhole transmitter to be near the drill bit. Also, the blade assembly can be placed so as to divert fluid from the nozzle to an acute angle relative to the longitudinal axis of the drill string. Alternative embodiments also include placing the fluid metering device rearward of the tool body.
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Deken Arthur D.
Dunn Richard P.
Franklin James E.
Lee Douglas W.
Dang Hoang C.
The Charles Machine Works, Inc.
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