US4231869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent cobalt catalyst for sulfite oxygen scavenging
Assignee: ConocoPhillips Co
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Filing: 1979-03-19
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Granted: 1980-11-04
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Expires: 1999-03-19
Abstract
Abstract In the recovery of hydrocarbons from petroliferous formations wherein water is injected into the formation through a borehole, oxygen is scavenged from water employed in recovery applications requiring low oxygen levels by mixing with a source of sulfite ion, said mixture then being passed over a cation exchange resin on which a cobalt ion or other metallic catalyst is adsorbed. The catalyst increases the reaction rate of the sulfite ion and the oxygen to form sulfate ion, while the resin maintains the cobalt in place.
Inventors
- 👤 Bob L. Carlberg
- 👤 Robert A. Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:25
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/845; C02; C02F; C02F1/00; C02F1/70; C02F1/72; C02F1/725; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/187; E; E21; E21B; E21B41/00; E21B41/02; Y; Y10; Y10S; Y10S166/00; Y10S166/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
In the recovery of hydrocarbons from petroliferous formations wherein water is injected into the formation through a wellbore, the method comprising reducing oxygen levels by mixing said water with a source of sulfite ion, said mixture then being passed over a catalyst bed containing water insoluble cation exchange resin having cobalt ions adsorbed thereon such that treated low oxygen content water contains substantially no cobalt ion.
Claim 2
Dependent Claim
66 words
In the recovery of hydrocarbons from petroliferous formations wherein water is injected into the formation through a wellbore, the method comprising reducing oxygen levels by mixing said water with a source of sulfite ion, said mixture then being passed over a catalyst bed containing water insoluble cation exchange resin having cobalt ions adsorbed thereon such that treated low oxygen content water contains substantially no cobalt ion.
Claim 3
Dependent Claim
28 words
A method as described in claim 1 wherein cobalt ions are adsorbed onto the cation exchange resin by immersing said resin in a water solution containing cobalt ions.
Claim 4
Dependent Claim
30 words
A method as described in claim 2 wherein the cobalt is provided by a material selected from the group consisting of cobalt chloride, cobalt bromide, cobalt iodide, and cobalt nitrate.
Claim 5
Dependent Claim
26 words
A method as described in claim 3 wherein the resin is immersed in a water solution of catalyst for at least 3 minutes prior to use.
Claim 6
Dependent Claim
25 words
A method as described in claim 3 wherein the water to be treated has sulfite ions present in at least stoichiometric ratio with dissolved oxygen.
Claim 7
Dependent Claim
21 words
A method as described in claim 5 wherein at least a 10 part per million excess of sulfite ions is present.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |