Patent US2441892A successfully refreshed from Google Patents.
Patent US2364877A successfully refreshed from Google Patents.
Patent US3454759A successfully refreshed from Google Patents.
Patent US2239328A successfully refreshed from Google Patents.
Patent US3196946A successfully refreshed from Google Patents.
US3196946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air method of cementing wells
Assignee: UNITED FUEL GAS CO
•
Filing: 1962-11-05
•
Granted: 1965-07-27
•
Expires: 1982-11-05
Abstract
No abstract record available.
Inventors
- 👤 James B Lauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:29
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A GAS METHOD OF CEMENTING WELLS OF THE TYPE WHEREIN A PRODUCTION CASING IS SUSPENDED WITHIN A GAS PRODUCING FORMATION SO AS TO DEFINE AN ANNULUS BETWEEN SAID FORMATION AND THE CASING COMPRISING: (A) PRESSURIZING SAID CASING AND SAID ANNULUS EXCLUSIVELY WITH A GAS IN A PRESSURE RANGE GREATE THAN THE PRESSURE OF THE GAS PRODUCING FORMATION AND LESS THAN THE FORMATION BREAKDOWN PRESSURE; (B) CHARGING CEMENT DOWN THROUGH AND INTO THE BOTTOM OF SAID CASING AND UP SAID ANNULUS, WHILE; (C) MAINTAINING A CONSTANT PRESURE WITHIN SAID PRESSURE RANGE IN SAID ANNULUS DURING SAID CHARGING AND UNTIL SAID CEMENT HAS SET.
Claim 2
Dependent Claim
102 words
A GAS METHOD OF CEMENTING WELLS OF THE TYPE WHEREIN A PRODUCTION CASING IS SUSPENDED WITHIN A GAS PRODUCING FORMATION SO AS TO DEFINE AN ANNULUS BETWEEN SAID FORMATION AND THE CASING COMPRISING: (A) PRESSURIZING SAID CASING AND SAID ANNULUS EXCLUSIVELY WITH A GAS IN A PRESSURE RANGE GREATE THAN THE PRESSURE OF THE GAS PRODUCING FORMATION AND LESS THAN THE FORMATION BREAKDOWN PRESSURE; (B) CHARGING CEMENT DOWN THROUGH AND INTO THE BOTTOM OF SAID CASING AND UP SAID ANNULUS, WHILE; (C) MAINTAINING A CONSTANT PRESURE WITHIN SAID PRESSURE RANGE IN SAID ANNULUS DURING SAID CHARGING AND UNTIL SAID CEMENT HAS SET.
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |