Patent US3672450A successfully refreshed from Google Patents.
US3672450A
Expired / Lapsed
US
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Method for in situ combustion ignition
Assignee: Cities Service Oil Co
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Filing: 1971-01-28
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Granted: 1972-06-27
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Expires: 1991-01-28
Abstract
Abstract A slug of material comprising an emulsion of water and carbon black with or without additives is injected into the vicinity about a proposed oxidant injection well in a fireflood pattern. A downhole heater or other suitable ignition means is introduced into the vicinity of the wellbore to be ignited. The initiation of a combustion drive or fireflood is enhanced by the presence of the carbon black material. Through injection of an oxidant, the carbon black ignites, forming an intense heat source about the wellbore from which the formation hydrocarbons are rapidly ignited.
Inventors
- 👤 Pratip Bandyopadhyay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:37
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
24 words
The process of claim 1 in which the water emulsion of carbon black comprises from about 0.01 to about 30.0 weight percent carbon black.
Claim 2
Dependent Claim
19 words
The process of claim 2 in which the carbon black is sized from about 0.1 to about 300 microns.
Claim 3
Dependent Claim
26 words
The process of claim 3 in which the heating is supplied by the introduction of a downhole wellbore heater into the wellbore, adjacent the subterranean formation.
Claim 4
Dependent Claim
11 words
The process of claim 4 in which the oxidant is air.
Claim 5
Dependent Claim
23 words
The process of claim 5 in which the slug size represents a zone from about 0.5 to about 25.0 feet from the wellbore.
Claim 6
Dependent Claim
14 words
The process of claim 1 in which the emulsion further comprises a wetting agent.
Claim 7
Dependent Claim
23 words
The process of claim 7 in which the wetting agent is present in the emulsion in about 0.001 to about 1.0 weight percent.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |