Curved drilling apparatus

Details Curved drilling apparatus Curved drilling apparatus

1994-03-25

1995-06-13

Neuder, William P.

Boring or penetrating the earth

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

Normally curved guide or shaft

175 76, E21B 708

Patent

active

054233895

ABSTRACT:
A rotary drill bit for drilling a curved subterranean borehole. In one embodiment, the drill bit comprises a side portion, a plurality of cutting elements that produce a lateral force on the drill bit in response to the rotation of the drill bit in the borehole, and bearing means. The bearing means is located on the side portion of the drill bit and contacts the borehole wall during drilling to receive a reactive force that is from the borehole, that is in response to the lateral force and that is directed to a location adjacent to the uphole end of the side portion of the drill bit. The reactive force and the lateral force form a downhole-moment that is about the drill bit and that is opposed by an uphole-moment having a force component that is directed at the flexible joint. The uphole end of the bearing means is located relatively close to the cutting elements such that the magnitude of the downhole-moment and the magnitude of the uphole-moment are minimized.

REFERENCES:
patent: 4262758 (1981-04-01), Evans
patent: 4739841 (1988-04-01), Das
patent: 4895214 (1990-01-01), Schoeffler
patent: 5213168 (1993-05-01), Warren et al.
patent: 5265687 (1993-11-01), Gray
T. M. Warren et al., "Short-Radius Lateral Drilling System", Orally presented Oct. 1992; Published Feb. 1993; p. 111 ff.
W. J. Winters et al., "Field Tests of a Low-Cost Lateral Drilling Tool," Presented Feb. 1993; pp. 2-7.

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