E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/6
E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 23/00 (2006.01)
Patent
CA 2002594
Abstract of the Disclosure 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 frilling fluid flow rate manipu- lations 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 drilling 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.
Gowling Lafleur Henderson Llp
Kick Sub Inc.
Schoeffler William N.
LandOfFree
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