Patent US4463808A successfully refreshed from Google Patents.
US4463808A
Expired / Lapsed
US
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Method for effecting seals in earth boreholes
Assignee: Baroid Technology Inc
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Filing: 1982-06-10
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Granted: 1984-08-07
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Expires: 2002-06-10
Abstract
Abstract A well fluid and method for borehole sealing such as grouting or plugging, the fluid being comprised of water, a water swellable clay and a water dispersible polymer which prevents immediate hydration of the clay.
Inventors
- 👤 Carl E. Mason
- 👤 Samuel E. Geffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:56
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/607; C09K8/608; Y; Y10; Y10S; Y10S106/00; Y10S106/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A method of effecting a seal in an earth borehole comprising preparing a sealing composition consisting essentially of substantially salt free water, from about 2 to about 4 lbs. per gallon of a water swellable clay, and from about 0.1% to about 1.5% by weight of a water dispersible hydrolyzed polyacrylamide polymer, said polymer being of a type which inhibits swelling of said clay for a period of time sufficient to permit emplacement of said servicing fluid at a predetermined location in a borehole; introducing said sealing composition into said predetermined location in said borehole prior to swelling of said clay, allowing said clay to swell to effect said seal.
Claim 2
Independent Claim
110 words
A method of effecting a seal in an earth borehole comprising preparing a sealing composition consisting essentially of substantially salt free water, from about 2 to about 4 lbs. per gallon of a water swellable clay, and from about 0.1% to about 1.5% by weight of a water dispersible hydrolyzed polyacrylamide polymer, said polymer being of a type which inhibits swelling of said clay for a period of time sufficient to permit emplacement of said servicing fluid at a predetermined location in a borehole; introducing said sealing composition into said predetermined location in said borehole prior to swelling of said clay, allowing said clay to swell to effect said seal.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said hydrolyzed polyacrylamide is in emulsion form.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein said water swellable clay comprises bentonite.
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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) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |