US2822872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of oil from reservoirs
Assignee: Pan American Petroleum Corp
•
Filing: 1954-05-10
•
Granted: 1958-02-11
•
Expires: 1974-05-10
Abstract
No abstract record available.
Inventors
- 👤 Michael J Rzasa
- 👤 Paul L Terwilliger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:09
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; E; E21; E21B; E21B43/00; E21B43/16; E21B43/166; E21B43/168
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
AN IMPROVEMENT IN RECOVERY OF OIL FROM A SUBTERRANEAN RESERVOIR UNDER RELATIVELY LOW PRESSURE COMPRISING FORCING SAID OIL TO A PRODUCING WELL BY A BODY OF HYDROCARBON LIQUID CONSISTING ESSENTIALLY OF AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF L. P. G., PROPANE, BUTANE, AND PENTANE, MAINTAINING SUFFICIENT PRESSURE ON SAID RESERVOIR TO KEEP SAID BODY ABOVE ITS BUBBLE POINT BUT NOT SUBSTANTIALLY ABOVE 400 POUNDS PER SQUARE INCH, DRIVING SAID BODY THROUGH SAID RESERVOIR BY A GAS CONTAINING OVER 80 PERCENT METHANE, AND PLACING BETWEEN SAID BODY AND SAID GAS A DIFFERENT MATERIAL ONLY WHICH IS CHARACTERIZED BY THE FOLLOWING: (1) IT BY ITSELF IS A GAS AT RESERVOIR PRESSURE AND TEMPERATURE, (2) IT IS SOLUBLE IN SAID BODY, AND (3) IT HAS AT RESERVOIR TEMPERATURE AND PRESSURE A NARROW TWO-PHASE REGION WHEN MIXED IN VARYING CONCENTRATIONS WITH MATERIAL FORMING SAID BODY
Claim 2
Dependent Claim
145 words
AN IMPROVEMENT IN RECOVERY OF OIL FROM A SUBTERRANEAN RESERVOIR UNDER RELATIVELY LOW PRESSURE COMPRISING FORCING SAID OIL TO A PRODUCING WELL BY A BODY OF HYDROCARBON LIQUID CONSISTING ESSENTIALLY OF AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF L. P. G., PROPANE, BUTANE, AND PENTANE, MAINTAINING SUFFICIENT PRESSURE ON SAID RESERVOIR TO KEEP SAID BODY ABOVE ITS BUBBLE POINT BUT NOT SUBSTANTIALLY ABOVE 400 POUNDS PER SQUARE INCH, DRIVING SAID BODY THROUGH SAID RESERVOIR BY A GAS CONTAINING OVER 80 PERCENT METHANE, AND PLACING BETWEEN SAID BODY AND SAID GAS A DIFFERENT MATERIAL ONLY WHICH IS CHARACTERIZED BY THE FOLLOWING: (1) IT BY ITSELF IS A GAS AT RESERVOIR PRESSURE AND TEMPERATURE, (2) IT IS SOLUBLE IN SAID BODY, AND (3) IT HAS AT RESERVOIR TEMPERATURE AND PRESSURE A NARROW TWO-PHASE REGION WHEN MIXED IN VARYING CONCENTRATIONS WITH MATERIAL FORMING SAID BODY
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) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |