US3387672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavitational method for drilling wells
Assignee: Mobil Oil AS
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Filing: 1964-06-26
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Granted: 1968-06-11
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Expires: 1984-06-26
Abstract
No abstract record available.
Inventors
- 👤 Evin L Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:54
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02; E21B21/00; E21B21/14; E21B7/00; E21B7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
IN A METHOD OF DRILLING A BOREBOLE WHEREIN A DRILLING FLUID IS CIRCULATED TO THE BOTTOM OF SAID BOREH LE THROUGH A DRILL STRING AND RETURNED TO THE SURFACE THROUGH THE ANNULAR SPACE AROUND THE DRILL STRING AND A DRILLING TOOL SUPPORTED AT THE LOWER END OF THE DRILL STRING IS ACTUATED TO INDUCE A STATE OF CAVITATION IN SAID DRILLING FLUID IN THE VICINITY OF THE BOTTOM OF SAID BOREHOLE, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF: (A) INTRODUCING INTO SAID DRILLING FLUID A GAS IN SUFFICIENT QUANTITY TO SUBSTANTIALLY SATURATE SAID DRILLING FLUID AT BOTTOMHOLE TEMPERATURE AND AT A PRESSURE EQUAL TO THE PRESSURE WITHIN SAID DRILLING FLUID AT THE BOTTOM OF SAID BOREHOLE REDUCED BY THE ACOUSTICAL PRESSURE DEVELOPED BY SAID DRILLING TOOL; AND
Claim 2
Dependent Claim
127 words
IN A METHOD OF DRILLING A BOREBOLE WHEREIN A DRILLING FLUID IS CIRCULATED TO THE BOTTOM OF SAID BOREH LE THROUGH A DRILL STRING AND RETURNED TO THE SURFACE THROUGH THE ANNULAR SPACE AROUND THE DRILL STRING AND A DRILLING TOOL SUPPORTED AT THE LOWER END OF THE DRILL STRING IS ACTUATED TO INDUCE A STATE OF CAVITATION IN SAID DRILLING FLUID IN THE VICINITY OF THE BOTTOM OF SAID BOREHOLE, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF: (A) INTRODUCING INTO SAID DRILLING FLUID A GAS IN SUFFICIENT QUANTITY TO SUBSTANTIALLY SATURATE SAID DRILLING FLUID AT BOTTOMHOLE TEMPERATURE AND AT A PRESSURE EQUAL TO THE PRESSURE WITHIN SAID DRILLING FLUID AT THE BOTTOM OF SAID BOREHOLE REDUCED BY THE ACOUSTICAL PRESSURE DEVELOPED BY SAID DRILLING TOOL; AND
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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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |