US4068731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended nozzle and bit stabilizer and method of producing
Assignee: Smith International Inc
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Filing: 1976-11-17
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Granted: 1978-01-17
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Expires: 1996-11-17
Abstract
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.
Inventors
- 👤 Lloyd L. Garner
- 👤 Charles Richard Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:57
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1092; E21B10/00; E21B10/08; E21B10/18; E21B10/46; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
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.
Claim 2
Dependent Claim
139 words
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.
Claim 3
Dependent Claim
18 words
The structure in claim 1, and the circle on which the stabilizing surface lies, being substantially on gage.
Claim 4
Dependent Claim
19 words
The structure of claim 1, and said bit stabilizing surface having at least a portion thereof of hard metal.
Claim 5
Dependent Claim
54 words
The structure of claim 1, and the support for said cutter means comprising a journal leg extending downwardly from the body with a rotary cone cutter journal thereon, said journal leg having a radially outer portion on approximately the same circle as that of said stabilizing surface of said upper portion of said nozzle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |