US3821985A
Expired / Lapsed
US
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Well cementing method using high temperature cementing compositions
Assignee: Halliburton Co
•
Filing: 1973-04-30
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Granted: 1974-07-02
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Expires: 1993-04-30
Abstract
Abstract This specification discloses additives for retarding the setting time of cement compositions at high temperatures which are basically comprised of mixtures of a lignosulfonic acid salt and a pentaboric acid salt, novel cement compositions containing the additives and methods of cementing high temperature well formations employing the cement compositions.
Inventors
- 👤 C George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:19
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C04; C04B; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
The method of claim 1 wherein the mixture of the lignosulfonic acid salt and borate compound is present in the cement slurry in an amount of from about 0.1 percent to about 10 percent based on the weight of dry cement.
Claim 2
Dependent Claim
26 words
The method of claim 2 wherein the lignosulfonic acid salt is selected from calcium lignosulfonate, magNesium lignosulfonate, barium lignosulfonate, sodium lignosulfonate, potassium lignosulfonate and lithium lignosulfonate.
Claim 3
Dependent Claim
25 words
The method of claim 3 wherein the borate compound is selected from calcium pentaborate, magnesium pentaborate, barium pentaborate, sodium pentaborate, potassium pentaborate and lithium pentaborate.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the lignosulfonic acid salt is calcium lignosulfonate.
Claim 5
Dependent Claim
12 words
The method of claim 5 wherein the borate compound is potassium pentaborate.
Claim 6
Dependent Claim
67 words
The method of claim 6 wherein the cement composition is further characterized to include in said additive a gluconic compound selected from gluconic acid, gluconic acid delta lactone, an alkali metal gluconate, and an alkaline earth metal gluconate, said gluconic compound being present in the mixture in an amount of from about 0.2 to about 1 part by weight per 1 part by weight of calcium lignosulfonate.
Claim 7
Dependent Claim
31 words
The method of claim 7 wherein the gluconic compound is selected from gluconic acid, gluconic acid delta lactone, sodium gluconate, potassium gluconate, lithium gluconate, calcium gluconate, magnesium gluconate and barium gluconate.
Claim 8
Dependent Claim
14 words
The method of claim 8 wherein the gluconic compound is gluconic acid delta lactone.
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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |