US3924698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit and method of drilling
Assignee: Gulf Research and Development Co
•
Filing: 1974-04-08
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Granted: 1975-12-09
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Expires: 1994-04-08
Abstract
Abstract A drill bit for abrasive jet drilling having nozzles positioned to cut a central hole surrounded by a plurality of concentric grooves. The nozzle outlet diameters vary depending on the location of the nozzles in the drill bit and are coordinated with the number of nozzles positioned to cut a particular groove so that all grooves are of substantially the same depth.
Inventors
- 👤 Hans C Juvkam-Wold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:28
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/18; E21B10/00; E21B10/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
In a drill bit for abrasive jet drilling of wells in which nozzles extend through the bottom of the drill bit to discharge from outlets of the nozzles streams of abrasive-laden drilling liquid to cut in the bottom of the borehole a central hole surrounded by a plurality of concentric grooves, said grooves being separated by ridges on which the drill bit is supported, the improvement comprising a plurality of nozzles positioned in the drill bit to discharge streams of abrasive-laden drilling liquid to cut each of the grooves, the ratio of the square of the diameter of the outlets of the nozzles times the number of nozzles for each of the grooves divided by the diameter of the grooves being substantially equal.
Claim 2
Dependent Claim
123 words
In a drill bit for abrasive jet drilling of wells in which nozzles extend through the bottom of the drill bit to discharge from outlets of the nozzles streams of abrasive-laden drilling liquid to cut in the bottom of the borehole a central hole surrounded by a plurality of concentric grooves, said grooves being separated by ridges on which the drill bit is supported, the improvement comprising a plurality of nozzles positioned in the drill bit to discharge streams of abrasive-laden drilling liquid to cut each of the grooves, the ratio of the square of the diameter of the outlets of the nozzles times the number of nozzles for each of the grooves divided by the diameter of the grooves being substantially equal.
Claim 3
Dependent Claim
59 words
The drill bit as set forth in claim 1, in which a single central nozzle having a nozzle outlet diameter between four and five times the diameter of the largest abrasive particles to be used in the drilling liquid is positioned to cut a central hole having no part within its periphery extending upwardly as high as the ridges.
Claim 4
Dependent Claim
85 words
The drill bit of claim 2, in which the number of nozzles in the drill bit positioned to cut the innermost groove is two and such nozzles have a minimum outlet diameter at least three times the diameter of the largest abrasive particles to be used in the drilling liquid, and the diameters of the outlets of the nozzles in the drill bit for cutting the grooves other than the innermost groove are at least as large as the nozzles for cutting the innermost groove.
Claim 5
Dependent Claim
37 words
A drill bit as set forth in claim 3 in which the maximum diameter of the outlet of the nozzles is five times the diameter of the largest abrasive particles to be used in the drilling liquid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |