Patent US3277971A successfully refreshed from Google Patents.
US3277971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous drilling fluids
Assignee: Dril-Kem Inc
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Filing: 1962-12-20
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Granted: 1966-10-11
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Expires: 1982-12-20
Abstract
No abstract record available.
Inventors
- 👤 Dawson Lester Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:08
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
40 words
FORMULATIONS FOR ADDITION TO GASEOUS DRILLING FLUIDS, COMPRISING ABOUT 0.5% (BY WEIGHT) TO ABOUT 20% (BY WEIGHT) MOLYBDENUM DISULFIDE, ABOUT 35% (BY WEIGHT) TO ABOUT 50% (BY WEIGHT) CALCIUM STEARATE, ABOUT 2% (BY WEIGHT) GLYCOL, AND THE BALANCE CALCIUM HYDROXIDE.
Claim 2
Dependent Claim
40 words
FORMULATIONS FOR ADDITION TO GASEOUS DRILLING FLUIDS, COMPRISING ABOUT 0.5% (BY WEIGHT) TO ABOUT 20% (BY WEIGHT) MOLYBDENUM DISULFIDE, ABOUT 35% (BY WEIGHT) TO ABOUT 50% (BY WEIGHT) CALCIUM STEARATE, ABOUT 2% (BY WEIGHT) GLYCOL, AND THE BALANCE CALCIUM HYDROXIDE.
Claim 3
Dependent Claim
62 words
IN A METHOD OF DRILLING A WELL WHEREIN A GASEOUS FLUID IS EMPLOYED TO REMOVE CUTTINGS AND THE LIKE FROM THE HOLE BEING DRILLED, THE IMPROVEMENT COMPRISING THE STEP OF CIRCULATING THROUGH THE DRILL STRING AND AROUND THE DRILL CUTTING SURFACES IN THE HOLE A DRY GAS CONTAINING DISTRIBUTED PARTICULATE MOLYBDENUM DISULPHIDE AND SELECTED PROPORTIONS OF CALCIUM STEARATE, CALCIUM HYDROXIDE AND GLYCOL.
Claim 4
Dependent Claim
62 words
IN A METHOD OF DRILLING A WELL WHEREIN A GASEOUS FLUID IS EMPLOYED TO REMOVE CUTTINGS AND THE LIKE FROM THE HOLE BEING DRILLED, THE IMPROVEMENT COMPRISING THE STEP OF CIRCULATING THROUGH THE DRILL STRING AND AROUND THE DRILL CUTTING SURFACES IN THE HOLE A DRY GAS CONTAINING DISTRIBUTED PARTICULATE MOLYBDENUM DISULPHIDE AND SELECTED PROPORTIONS OF CALCIUM STEARATE, CALCIUM HYDROXIDE AND GLYCOL.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |