Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Patent
1988-11-18
1990-01-23
Massie, IV, Jerome W.
Boring or penetrating the earth
Automatic control
In response to drilling fluid circulation
175 73, 175 76, 175256, E21B 708
Patent
active
048952141
ABSTRACT:
An improved directional drilling tool permits changing the downhole drilling assembly between straight and directional drilling configuration by manipulation of conventional drilling fluid flow controls at the surface. A housing, with stabilizer features, shrouds a shaft which functions as an extension of the drill string and attaches to a drill head. A drilling fluid flow rate responsive selector valve is situated in the shaft and responds to drilling fluid flow rate manipulations to change assembly configuration. In the straight configuration the shaft remains straight and is rotationally locked to the housing. In the directional configuration the housing is rotationally unlocked from the shaft, normally after directional orientation, so that the shaft can rotate through it. The same action transversely displaces the shaft midsection relative to the housing and the shaft and drill head below is angularly deflected by way of a hinge arrangement near the drill head end of the housing. The process can be reversed for straight drilling by further drilling fluid flow rate manipulations.
REFERENCES:
patent: 4597454 (1986-07-01), Schoeffler
patent: 4655289 (1987-04-01), Schoeffler
patent: 4655299 (1987-04-01), Schoeffler
patent: 4732223 (1988-03-01), Schoeffler et al.
patent: 4811798 (1989-03-01), Falgout, Sr. et al.
Jeter John D.
Massie IV Jerome W.
Melius Terry Lee
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