US3734182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for locating oil and gas field boundaries
Assignee: Cardinal Petroleum Co
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Filing: 1971-05-07
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Granted: 1973-05-22
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Expires: 1991-05-07
Abstract
Abstract A method and apparatus for detecting the presence, direction of and the distance to barriers in underground oil and gas fields by directional flow data.
Inventors
- 👤 H Warren
- 👤 R Ragland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:17
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; E21B49/00; E21B49/008
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
79 words
A method for locating barriers in underground oil and gas reservoirs comprising the steps of drilling and completing a well in an underground reservoir, operating said well as a given production rate for a predetermined period of time, shutting-in said well, sensing the pressure within said reservoir in at least four equally spaced radial directions from said well, and using differential pressure readings from said pressure sensings to indicate the presence and direction of a barrier in said reservoir.
Claim 2
Independent Claim
79 words
A method for locating barriers in underground oil and gas reservoirs comprising the steps of drilling and completing a well in an underground reservoir, operating said well as a given production rate for a predetermined period of time, shutting-in said well, sensing the pressure within said reservoir in at least four equally spaced radial directions from said well, and using differential pressure readings from said pressure sensings to indicate the presence and direction of a barrier in said reservoir.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said pressures are sensed in eight different directions and wherein said differential pressures are between diametrically opposed directions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |