Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1997-05-12
2000-04-18
Dang, Hoang C.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
175 73, E21B 706
Patent
active
060503505
ABSTRACT:
An underground directional drilling steering tool for use with a variety of commercially known drill bits which controls the direction of drill while the drill bit is directly powered by the drill string by way of a drill string coupling. The offset transmitter housing retains the tool in a stable orientation downhole by means of the drill string coupling offset orientation in the housing and stabilizing fins affixed to the exterior of the offset transmitter housing. The positioning of the drill bit in relation to the positioning of the offset transmitter housing in the center of the borehole creates a drilling pathway with a constant curvature away from the wide side of the offset transmitter housing. The direction of this curvature is controlled by means of a jaw clutch, which jaw clutch is engaged by drawing back slightly on the drill string thereby retracting the drive shaft and pulling the drill bit coupling within closer proximity to the offset transmitter housing. Thereafter, the drill string is carefully rotated to reposition the orientation of the offset transmitter housing from 1.degree. to 359.degree. from its previous position following which forward drilling again proceeds.
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No-Dig International, A First in France, Sep. 1996, by Ian Clarke.
Brochure from American Directional Drill, DD-15 / DD-30 Directional Drills.
Brochure from bor-mor, Self-Contained Directional Drilling Equipment, Model 400TX.
Heims Bruce
Morris Waldo
Dang Hoang C.
Johnson Glenn
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