Rock bit circulation nozzle

Patent · Tue Aug 18 00:00:00 EDT 1987

OSTI ID:6002344

Evans, R F

A drill bit is described having a body with a central axis, at least one cutting face, and a means for containing drilling fluid in the body of the drill bit, the improvement comprising: a nozzle mounted on the central axis of the drill bit body for ejecting the drilling fluid from the body of the drill bit into the space at the bottom of a bore hole to thereby cause the drilling fluid to form a downwardly directed vortex in the space above the bottom of the bore hole and to sweep cuttings away from the cutting face of the drill bit, the nozzle comprising a base having at least two outlets formed therethrough, each of the outlets having a center axis directed at an angle skew to the center axis of each of the other outlets and to the central axis of the body and the center axis of each outlet having a partial horizontal component radially directed toward the skew to the central axis of the body. A drill bit is also described having a body with a central axis, at least one cutting face, and a means for containing drilling fluid in the body of the drill bit, the improvement comprising: a nozzle mounted on the central axis of the drill bit body for ejecting the drilling fluid from the body of the drill bit into the space at the bottom of a bore hole to thereby cause the drilling fluid to form a downwardly directed vortex in the space above the bottom of the bore hole to sweep cuttings away from the cutting face of the drill bit, the nozzle including: a base having a central axis; a bore down the central axis of the base; and a plurality of helical grooves formed along the outer surface of the bore for imparting angular momentum to a portion of the drilling fluid, wherein the width of each of the grooves is greater at the edge of the groove toward the outer circumference of the nozzle than at the intersection of the groove and the outer surface of the bore.

• Assignee: Varel Manufacturing Co., Dallas, TX
• Patent Number(s): US 4687066
• OSTI ID: 6002344
• Resource Relation: Patent File Date: Filed date 15 Jan 1986
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
DRILL BITS
DESIGN
OPERATION
ROCK DRILLING
WELL DRILLING
CUTTINGS REMOVAL
DRILLING FLUIDS
INCIDENCE ANGLE
NATURAL GAS WELLS
NOZZLES
OIL WELLS
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FLUIDS
REMOVAL
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)