Drill bit
AssigneeNOV Downhole Eurasia Limited
InventorsVasiliy Zbaraskiy, Benoit Botton, Robert Peter Douglas Tipples
Life of this patent
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Abstract
A drill bit comprises a bit body having a body face and a plurality of blades each extending from the bit body from a root portion adjacent the body face to a tip portion defining a cutting region, each blade having a leading face and a trailing face. The drill bit further comprises at least one outlet port disposed adjacent the leading face of at least one blade at a location between the root and tip portions of said at least one blade, the at least one outlet port for directing drilling fluid towards the cutting region of the at least one blade.
Claims22
A drill bit, comprising:
- a bit body having a body face;
- a plurality of blades each extending from the bit body from a root portion adjacent the body face to a tip portion defining a cutting region, each blade having a leading face and a trailing face;
- and
- at least one outlet port disposed adjacent the leading face of at least one blade at a location between the root and tip portions of said at least one blade, the at least one outlet port for directing drilling fluid towards the cutting region of the at least one blade, wherein the at least one outlet port is elongate in a direction generally parallel with the leading face of the at least one blade, and wherein the at least one outlet port comprises a varying geometry along its length, wherein the varying geometry is defined by a slot profile that is tapered moving from a first longitudinal end of the at least one outlet port to a second longitudinal end of the at least one outlet port.
A method for drilling a bore, comprising:
- engaging a drill bit against a formation to be drilled, the drill bit comprising a bit body having a body face and a plurality of blades each extending from the bit body from a root portion adjacent the body face to a tip portion defining a cutting region, each blade having a leading face and a trailing face;
- rotating the drill bit to cause the cutting region of each blade to remove material from the formation to produce drill cuttings;
- and
- flowing drilling fluid from at least one outlet port which is disposed adjacent the leading face of at least one blade at a location between the root and tip portions of said at least one blade, the drilling fluid being directed towards the cutting region of the at least one blade, wherein the at least one outlet port is elongate in a direction generally parallel with the leading face of the at least one blade, wherein the at least one outlet port comprises a varying geometry along its length, and wherein the varying geometry is defined by a slot profile that is tapered moving from a first longitudinal end of the at least one outlet port to a second longitudinal end of the at least one outlet port.
A drill bit, comprising:
- a bit body having a body face;
- a plurality of blades each extending from the bit body from a root portion adjacent the body face to a tip portion defining a cutting region, each blade having a leading face and a trailing face;
- a plurality of nozzles disposed on the body face to flow drilling fluid out of the bit body;
- and
- at least one outlet port disposed adjacent the leading face of at least one blade at a location between the root and tip portions of said at least one blade, the at least one outlet port for directing drilling fluid towards the cutting region of the at least one blade, wherein the at least one outlet port is elongate in a direction generally parallel with the leading face of the at least one blade, and wherein the at least one outlet port comprises a varying geometry along its length, wherein the varying geometry is defined by a slot profile that is tapered moving from a first longitudinal end of the at least one outlet port to a second longitudinal end of the at least one outlet port.
Dependencies are inferred from the claim text.