Patent US4466835A successfully refreshed from Google Patents.
US4466835A
Expired / Lapsed
US
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Cement compositions containing set retarders
Assignee: Schlumberger Technology Corp
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Filing: 1983-04-18
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Granted: 1984-08-21
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Expires: 2003-04-18
Abstract
Abstract The process of employing as a cement setting retarder a compound which is a derivative of dicyclopentadiene bis(methylamine) wherein at least one amine hydrogen is substituted with a methylenephosphonic acid group or a salt thereof.
Inventors
- 👤 Druce K. Crump
- 👤 David A. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:13
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/003
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
122 words
In a process for retarding the setting of an aqueous cement slurry which comprises adding to said slurry an organic phosphonate, the improvement which comprises employing a compound of the formula ##STR2## wherein A, B, C and D substituents are independently selected from hydrogen, --CH 2 PO 3 H 2 , --(CH 2 ) n OH wherein n is 1 to 4, CH 2 CHOHSO 3 H, CH 2 CHOHCH 2 SO 3 H, --(CH 2 ) n COOH wherein n is 1 to 3 and the alkali metal, alkaline earth metal, ammonia and amine salts of the aforementioned phosphonic, sulfonic or carboxylic acids, providing that at least one of the above substituents is a methylenephosphonic acid group or the salt thereof.
Claim 2
Dependent Claim
122 words
In a process for retarding the setting of an aqueous cement slurry which comprises adding to said slurry an organic phosphonate, the improvement which comprises employing a compound of the formula ##STR2## wherein A, B, C and D substituents are independently selected from hydrogen, --CH 2 PO 3 H 2 , --(CH 2 ) n OH wherein n is 1 to 4, CH 2 CHOHSO 3 H, CH 2 CHOHCH 2 SO 3 H, --(CH 2 ) n COOH wherein n is 1 to 3 and the alkali metal, alkaline earth metal, ammonia and amine salts of the aforementioned phosphonic, sulfonic or carboxylic acids, providing that at least one of the above substituents is a methylenephosphonic acid group or the salt thereof.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the compound employed is the tetramethylenephosphonic acid derivative of dicyclopentadiene bis(methylamine) or a salt thereof.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the compound employed contains three methylenephosphonic acid groups as substituents of dicyclopentadiene bis(methylamine) or a salt thereof.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the compound employed contains two methylenephosphonic acid groups as substituents of dicyclopentadiene bis(methylamine) or a salt thereof.
Claim 6
Dependent Claim
22 words
The process of claim 3 wherein the trimethylenephosphonic acid derivative contains a hydroxypropylsulfonic acid group in place of the remaining amine hydrogen.
Claim 7
Dependent Claim
22 words
The process of claim 4 wherein the compound employed contains two hydroxypropylsulfonic acid groups in place of the remaining two amine hydrogens.
Claim 8
Dependent Claim
21 words
The process of claim 3 wherein the trimethylenephosphonic acid derivative contains a hydroxyethyl group in place of the remaining amine hydrogen.
Claim 9
Dependent Claim
21 words
The process of claim 4 wherein the compound employed contains two hydroxyethyl groups in place of the remaining two amine hydrogens.
Claim 10
Dependent Claim
21 words
The process of claim 3 wherein the trimethylenephosphonic acid derivative contains a hydroxypropyl group in place of the remaining amine hydrogen.
Claim 11
Dependent Claim
21 words
The process of claim 4 wherein the compound employed contains two hydroxypropyl groups in place of the remaining two amine hydrogens.
Claim 12
Dependent Claim
22 words
The process of claim 4 wherein the compound employed contains two sodium acetate groups in place of the remaining two amine hydrogens.
Claim 13
Dependent Claim
22 words
The process of claim 3 wherein the trimethylenephosphonic acid derivative contains a sodium propionate group in place of the remaining amine hydrogen.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein the temperature of the cement slurry is at least 180° F. (˜82° C.).
Claim 15
Dependent Claim
15 words
The process of claim 1 wherein the cement slurry is injected into an oil well.
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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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |