Drilling sub

Details Drilling sub Drilling sub

1981-08-05

1984-10-30

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

175324, E21B 1718

Patent

active

044795580

ABSTRACT:
An improved construction is provided for a transverse passageway and a nozzle of a drilling sub of the type used to eject drilling fluid from the transverse passageway to create a vortex in an annulus surrounding the drilling sub.

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Bits Designed to Reduce Bottom-Hole Pressure While Drilling, A Thesis Submitted to the Graduate Faculty of the Louisiana State University, Dept. of Petroleum Engineering by Mohamed Sadik Bizanti, Dec. 1978.
Society of Petroleum Engineers, Paper SPE 7516, Cholet and Crausse, Entitled "Improved Hydraulics for Rock Bits", 1978.
World Oil, Oct. 1977, pp. 63-65, Cholet et al., "Unique Bit Design Improves Hydraulics and Performance".
Journal of Petroleum Technology, Dec. 1965, pp. 1443-1448, McLean, "Velocities, Kinetic Energy and Shear in Crossflow Under Three-Cone Jet Bits".
Journal of Petroleum Technology, Nov. 1971, pp. 1299-1304, Sutko et al., "The Effect of Nozzle Size, Number, and Extension on the Pressure Distribution Under a Tricone Bit".
Society of Petroleum Engineers Journal, Aug. 1973, pp. 233-238, Sutko, "Drilling Hydraulics-A Study of Chip Removal Force Under a Full-Size Jet Bit".
The Oil and Gas Journal, Mar. 19, 1979, pp. 88-97, Baker, "Extended Nozzle Bits Require Precise Nozzle Sizing".
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U.S. Patent Application Ser. No. 169,676 of Hayatdavoudi et al., filed Jul. 17, 1980, and assigned to the assignee of the present invention.

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