Patent US4568708A successfully refreshed from Google Patents.
US4568708A
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Composition and method for effecting seals in earth boreholes
Assignee: Baroid Technology Inc
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Filing: 1984-06-20
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Granted: 1986-02-04
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Expires: 2004-06-20
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
2026-10-27 16:58
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; Y; Y10; Y10S; Y10S507/00; Y10S507/926
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
A well servicing fluid consisting essentially of salt-free water, from about 2 to about 4 lbs. per gallon of bentonite, and from about 0.1% to about 1.5% by weight of a water dispersible polymer selected from the class consisting of polyacrylamide, hydrolyzed polyacrylamide and mixtures thereof, 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.
Claim 2
Dependent Claim
78 words
A well servicing fluid consisting essentially of salt-free water, from about 2 to about 4 lbs. per gallon of bentonite, and from about 0.1% to about 1.5% by weight of a water dispersible polymer selected from the class consisting of polyacrylamide, hydrolyzed polyacrylamide and mixtures thereof, 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.
Claim 3
Dependent Claim
14 words
The well fluid of claim 1 wherein said hydrolyzed polyacrylamide is in emulsion form.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |