Patent US3976138A successfully refreshed from Google Patents.
US3976138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing permeability in subsurface earth formation
Assignee: Praxair Technology Inc
•
Filing: 1975-10-15
•
Granted: 1976-08-24
•
Expires: 1995-10-15
Abstract
Abstract Alumina propping agents having a size of at least 30 mesh are introduced into a fracture created in an oil well/or gas bearing earth formation to deposit a packed multilayer distribution of said alumina propping agents.
Inventors
- 👤 Patrick Joseph Colpoys, Jr.
- 👤 Eugene Allen Neel, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:07
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/80; E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
In a method of improving the permeability to fluids of a sub-surface earth formation penetrated by a well wherein a fluid is pumped into the well to create a fracture therein, the improvement which comprises introducing an alumina propping agent having a size of at least 30 mesh into a fluid; introducing said alumina propping agent containing fluid into a fracture, the compaction pressure of which is at least 8,000 psi, to deposit a packed multilayer distribution of alumina propping agents.
Claim 2
Dependent Claim
81 words
In a method of improving the permeability to fluids of a sub-surface earth formation penetrated by a well wherein a fluid is pumped into the well to create a fracture therein, the improvement which comprises introducing an alumina propping agent having a size of at least 30 mesh into a fluid; introducing said alumina propping agent containing fluid into a fracture, the compaction pressure of which is at least 8,000 psi, to deposit a packed multilayer distribution of alumina propping agents.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |