US3708014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrochloric acid/hydrofluoric acid treatment to remove asbestos fibers from a well bore
Assignee: Phillips Petroleum Co
•
Filing: 1971-06-23
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Granted: 1973-01-02
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Expires: 1991-06-23
Abstract
Abstract An aqueous mixture of hydrochloric acid and hydrofluoric acid is employed to accomplish the 98 percent disintegration of chrysotile asbestos. In a specific embodiment an aqueous mixture of hydrochloric acid and hydrofluoric acid is injected into a well to remove chrysotile asbestos injected into the well in a well-working fluid.
Inventors
- 👤 R Wally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:27
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/30; A62D3/36; B; B09; B09B; B09B3/00; B09B3/70; C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; C09K8/78; A62D2101/00; A62D2101/40; A62D2101/41; B09B2101/00; B09B2101/35; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
44 words
A method for removing chrysotile asbestos from a well bore comprising injecting into the well an aqueous solution of a mixture of hydrochloric acid and hydrofluoric acid with circulation for a time sufficient to dissolve the chrysotile asbestos by the method of claim 1.
Claim 2
Dependent Claim
26 words
The method of claim 2 wherein the ratio of weight percent hydrochloric acid to weight percent hydrofluoric acid is in the range of 30:1 to 4:1.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the combination of acids is comprised of 15 percent by weight hydrochloric acid and 2.1 percent by weight hydrofluoric acid.
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |