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US3174561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavitation as an aid to rotary drilling
Assignee: Individual
•
Filing: 1960-03-23
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Granted: 1965-03-23
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Expires: 1980-03-23
Abstract
No abstract record available.
Inventors
- 👤 Eugene L Sterrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:11
CPC Classifications
E; E21; E21B; E21B21/00; Y; Y10; Y10S; Y10S507/00; Y10S507/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD FOR IMPROVING THE ROTARY DRILLING PENETRATION RATE IN A WELL DRILLING SYSTEM WHEREIN A DRILL BIT IS ROTATED BY A HOLLOW STEM TO DRILL THE WELL AND CIRCULATING DRILLING FLUID IS CIRCULATED DOWNWARDLY THROUGH THE STEM AND THE BIT AND OUTWARDLY BETWEEN THE STEM AND THE WELL, WHICH METHOD COMPRISES ADDING TO THE FRAGIBLE CAPSULES ING FLUID A PLURALITY OF HOLLOW AND FRANGIBLE CAPSULES WHICH ARE OF A SIZE AND SHAPED AS TO BE FREELY CARRIED BY THE DRILLING FLUID THROUGH THE STEM AND DRILL AND CREATE CAVITATION WHEN THE CAPSULES ARE BROKEN BY THE DRILL BIT AT THE BOTTOM OF THE WELL.
Claim 2
Independent Claim
105 words
A METHOD FOR IMPROVING THE ROTARY DRILLING PENETRATION RATE IN A WELL DRILLING SYSTEM WHEREIN A DRILL BIT IS ROTATED BY A HOLLOW STEM TO DRILL THE WELL AND CIRCULATING DRILLING FLUID IS CIRCULATED DOWNWARDLY THROUGH THE STEM AND THE BIT AND OUTWARDLY BETWEEN THE STEM AND THE WELL, WHICH METHOD COMPRISES ADDING TO THE FRAGIBLE CAPSULES ING FLUID A PLURALITY OF HOLLOW AND FRANGIBLE CAPSULES WHICH ARE OF A SIZE AND SHAPED AS TO BE FREELY CARRIED BY THE DRILLING FLUID THROUGH THE STEM AND DRILL AND CREATE CAVITATION WHEN THE CAPSULES ARE BROKEN BY THE DRILL BIT AT THE BOTTOM OF THE WELL.
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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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |