US3215199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidizing oil formations
Assignee: Shell USA Inc
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Filing: 1963-02-21
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Granted: 1965-11-02
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Expires: 1983-02-21
Abstract
No abstract record available.
Inventors
- 👤 Richard E Dilgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
A PROCESS OF TREATING THE MATRIX OF A SUBTERRANEAN FORMATION PENETRATED BY A WELL BORE WHICH IS SUBSTANTIALLY FREE OF A MUD CAKE, WHICH COMPRISES INTRODUCING THROUGH SAID WELL BORE AND INJECTING INTO SAID MUD-FREE PORTIONS OF SAID FORMATION MATRIX AT A PRESSURE GREATER THAN THE FORMATION PRESSURE A LIQUID SOLUTION COMPRISING A SOLUTION OF AN ORGANIC HALIDE IN A STOICHIOMETRIC EXCESS OF A SOLVATING MEDIUM COMPRISING A COMPOUND CONTAINING AN ATOM WITH UNSHARED ELECTRON PAIRS FROM THE GROUP OF ATOMS CONSISTING OF OXYGEN AND NITROGEN ATOMS, SAID SOLVATING MEDIUM BEING CAPABLE OF REACTING AT THE TEMPERATURE OF THE SUBTERRANEAN FORMATION WITH THE ORGANIC HALIDE TO YIELD HYDROGEN HALIDE, AND LEAVING SAID LIQUID MIXTURE IN SAID FORMATION FOR A TIME SUFFICIENT FOR THE SO-FORMED HYDROGEN HALIDE TO DISSOLVE A PORTION OF SAID FORMATION.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |