Drillable drill bit nozzle
AssigneeWeatherford/Lamb, Inc.
InventorMike Wardley
Life of this patent
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Abstract
A drill bit nozzle (1) providing a through bore for the passage of drilling fluid through a drill bit. The nozzle (1) is made of a material or materials which can be drilled through by standard well bore drilling equipment. The material(s) are selected to provide a surface (5) to the through bore which has a relatively high resistance to erosion to withstand the abrasive and corrosive impact of jetted drilling fluid. Embodiments are described using a hard chrome/copper combination and a single rubber material.
Claims8
A drill bit nozzle comprising a body defining a through bore, wherein the through bore defines a passage for drilling fluid in use, wherein the through bore includes a surface having a relatively high resistance to erosion and wherein the nozzle is characterised in that the body is made substantially of one or more materials that allow for the nozzle to be subsequently drilled through by standard well bore drilling equipment.
A method of drilling a well bore including the steps of:
- (a) drilling a bore to a first depth using a first drill bit;
- and
- (b) drilling the bore to a second depth using a second drill bit, the second depth being deeper than the first depth and characterised in that the second drill bit drills through the first drill bit in the bore at the first depth, and at least the first drill bit includes at least one nozzle according to any one of the preceding claims.
Dependencies are inferred from the claim text.