Extended nozzle and bit stabilizer and method of producing
AssigneeSmith International, Inc.
InventorsLloyd L. Garner, Charles Richard Harris
Life of this patent
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Abstract
A rotary drill bit with downwardly extended circulation nozzle means an outwardly facing portion of which serves as a bit stabilizer wherein the upper portion of the nozzle means is on a greater diameter than the lower portion thereof so that the lower portion is inset from the wall of the formation, the upper portion of the nozzle means being machined from a given larger diameter to a diameter approximately but preferably slightly less than that of the bit body, and providing in the machine surface hardened inserts such as tungsten carbide.
Claims4
In a drill bit having a rotary body with a longitudinal axis of rotation, a drilling fluid supply passage, cutter means supported by and disposed below the body, and of a given gage,
- a drilling fluid nozzle having an upper portion supported by the body in flow communication with the drilling fluid supply passage and having a downwardly extending free lower portion with a drilling fluid outlet,
- the upper portion of said nozzle having a radially outer portion comprising a wear-resisting, bit stabilizing surface on a circle approximating the diameter of the bit,
- and the lower portion of said nozzle having a radially outer portion lying within a circle concentric to and of less diameter than that of said upper nozzle portion to protect said lower portion from wear and shock from the wall of a hole being drilled.
Dependencies are inferred from the claim text.