Composite nozzles for rock bits

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element

Patent

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Details

175393, E21B 1018

Patent

active

054941229

ABSTRACT:
A composite mini-extended nozzle is disclosed that is designed to both resist erosion and be strong enough to withstand the shock of a downhole drilling environment. In addition, means are provided to shroud at least a portion of the extended nozzle to further protect a portion of the nozzle nearest the exit plane from downhole obstructions. A combination of materials used to form the nozzle may include a matrix of tungsten carbides with suitable binder joined to an outer metal jacket nozzle body. A third ceramic matrix material may be utilized to line or partially line an interior passage formed by the mini-extended nozzle and a reduced in diameter portion of the nozzle design may include a built-in fracture plane in the unlikely event the end of the nozzle hits an obstruction. The extended portion of the nozzle will shear off along this fracture plane thereby preventing a nozzle washout that likely would result in a trip out of the hole to repair the resultant damage to the rock bit.

REFERENCES:
patent: 3111179 (1963-11-01), Albers et al.
patent: 3744581 (1973-07-01), Moore
patent: 4301877 (1981-11-01), Cloud
patent: 4392534 (1983-07-01), Miida
patent: 4533005 (1985-08-01), Morris
patent: 4665999 (1987-05-01), Shoemaker
patent: 4687067 (1987-08-01), Smith et al.
patent: 4711311 (1987-12-01), Underwood et al.
patent: 5072796 (1991-12-01), Shen et al.

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