Patent US3561533A successfully refreshed from Google Patents.
US3561533A
Expired / Lapsed
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Controlled chemical heating of a well using aqueous gas-in-liquid foams
Assignee: Chevron USA Inc
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Filing: 1969-07-17
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Granted: 1971-02-09
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Expires: 1989-07-17
Abstract
Abstract Aqueous gas-in-liquid well circulation foams are useful as agents in the chemical heating of a well, e.g., (1) as a cover or blanketing means for hypergolic reactions carried out in a well, or (2) as a carrier means for the controlled introduction and contacting of one or more reactive chemicals of a high energy reaction system into a well.
Inventors
- 👤 John C Mckinnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:26
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/92; C09K8/94; E; E21; E21B; E21B36/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
20 words
The improvement as in claim 1 further characterized in that said foam is employed as a cover for said reaction.
Claim 2
Dependent Claim
24 words
The improvement as in claim 1 further characteRized in that said foam is used as a carrier for at least one of said components.
Claim 3
Dependent Claim
16 words
The improvement as in claim 1 further characterized in that said well is an oil well.
Claim 4
Dependent Claim
57 words
In the heating of a well by means of an exothermic two component chemical reaction, the improvement which comprises separately incorporating said components into separate preformed aqueous gas-in-liquid foams, separately introducing said foams into a well and mixing said foams at a predetermined zone in the well, thereby heating said zone by the resulting exothermic chemical reaction.
Claim 5
Dependent Claim
17 words
The improvement as in claim 5 further characterized in that said reactants are hydrazine and hydrogen peroxide.
Claim 6
Dependent Claim
19 words
The improvement as in claim 5 further characterized in that said reactants are unsymmetrical dimethyl hydrazine and hydrogen peroxide.
Claim 7
Dependent Claim
53 words
In the heating of a well by means of an exothermic two component chemical reaction, the improvement which comprises placing one of said reactants at a predetermined zone in the well, incorporating the second of said reactants into a preformed aqueous gas-in-liquid foam and circulating said foam into contact with said first reactant.
Claim 8
Dependent Claim
34 words
The improvement as in claim 8 further characterized in that said first reactant is fuming nitric acid and in that said second reactant which is incorporated in the foam is an organic hypergolic fuel.
Claim 9
Dependent Claim
40 words
The improvement as in claim 8 further characterized in that said first reactant is aqueous hydrogen peroxide and in that said second reactant which is incorporated in the foam is selected from the group consisting of hydrazine and unsymmetrical dimethylhydrazine.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |