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US3662831A
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Method for sealing earth formations
Assignee: Chevron USA Inc
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Filing: 1970-08-28
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Granted: 1972-05-16
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Expires: 1990-08-28
Abstract
Abstract Porous earth formations are sealed by alternately injecting concentrated phosphoric acid and furfuryl alcohol into the formations.
Inventors
- 👤 Patrick H Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:12
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/506; C09K8/508; C09K8/5086
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
16 words
The method as in claim 1 wherein the acid is the first reagent to be introduced.
Claim 2
Dependent Claim
16 words
The method as in claim 1 wherein the alcohol is the first reagent to be introduced.
Claim 3
Dependent Claim
44 words
The method as in claim 1 wherein prior to the introduction of the second reagent, a spacer liquid inert to both of said reagents is introduced in an amount sufficient to keep the acid and the alcohol apart until they have entered the formation.
Claim 4
Independent Claim
40 words
The method of sealing a permeable earth formation adjacent to a well bore, which comprises separately introducing two reagents into the formation, said reagents consisting essentially of concentrated phosphoric acid and furfuryl alcohol, said acid being the first reagent introduced.
Claim 5
Dependent Claim
42 words
The method as in claim 5 wherein prior to the introduction of said alcohol, a spacer liquid inert to both of said reagents is introduced in an amOunt sufficient to keep the acid and alcohol apart until they have entered the formation.
Claim 6
Dependent Claim
26 words
The method as in claim 5 wherein prior to the introduction of said acid, an inert liquid is introduced into the formation to displace formation water.
Claim 7
Independent Claim
39 words
The method of sealing a permeable zone adjacent to a well bore, which comprises separately introducing two reagents into the formation, said reagents consisting essentially of concentrated phosphoric acid and furfuryl alcohol, said acid being the first reagent introduced.
Claim 8
Dependent Claim
26 words
The method as in claim 8 wherein prior to the introduction of said acid an inert liquid is introduced into the formation to displace formation water.
Claim 9
Dependent Claim
42 words
The method as in claim 8 wherein prior to the introduction of said alcohol a spacer liquid inert to both of said reagents is introduced in an amount sufficient to keep the acid and alcohol apart until they have entered the formation.
Claim 10
Independent Claim
40 words
The method of sealing a permeable earth formation comprising separately injecting phosphoric acid and furfuryl alcohol into the formation and contacting said acid and alcohol in said formation to form a reaction product thereby reducing the permeability of said formation.
References Cited (Backward Citations)
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Cited
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US3199590A
Cited
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Cited
US3378071A
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |