Patent US3662830A successfully refreshed from Google Patents.
US3662830A
Expired / Lapsed
US
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Aqueous hydraulic cement composition having improved retardation to set and use thereof in high temperature environments
Assignee: Schlumberger Technology Corp
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Filing: 1970-06-01
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Granted: 1972-05-16
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Expires: 1990-06-01
Abstract
Abstract In a method of cementing at relatively high ambient temperatures employing an aqueous hydraulic cement slurry, the improvement comprising admixing therewith an effective amount of both (1) a salt of lignosulfonic acid and (2) boric acid or a borate whereby a synergistic retarding effect on the setting rate of the slurry is attained without any accompanying adverse effects.
Inventors
- 👤 Robert C Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:33
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C09; C09K; C09K8/00; C09K8/42; C09K8/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
The method according to claim 1 wherein component (1) is sodium calcium lignosulfonate.
Claim 2
Dependent Claim
15 words
The method according to claim 1 wherein component (2) is borax or a borax hydrate.
Claim 3
Dependent Claim
53 words
The method according to claim 1 wherein said cement slurry is emplaced in a geologic formation penetrated by a borehole and the cement slurry is injected down the borehole at sufficient pressure and controlled conditions to locate it at the desired level and to force it into the formation to the extent desired.
Claim 4
Dependent Claim
38 words
The method according to claim 1 wherein there are present in said slurry up to 50 parts, based upon the dry weight of cement present, pulverulent silica of a mesh size of between about 100 to about 200.
References Cited (Backward Citations)
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 |