US4120736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well cementing process and composition
Assignee: Halliburton Co
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Filing: 1977-02-28
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Granted: 1978-10-17
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Expires: 1997-02-28
Abstract
Abstract Oil well cementing compositions and processes are produced using a high efficiency sulfoalkylated lignin retarder composition and modifications thereof to produce cement compositions without gelation problems, having high early strength and with precisely controllable setting time.
Inventors
- 👤 Jerry D. Childs
- 👤 Roosevelt Love
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:08
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B24/00; C04B24/16; C04B24/18; C09; C09K; C09K8/00; C09K8/42; C09K8/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A non-gelling hydraulic cement composition having a high degree of predictability containing a retarder for controlling rheology and setting time of hydraulic cement comprising a mixture of hydraulic cement, at least one water soluble hydroxy carboxylic acid and a low molecular weight sulfoalkylated lignin; wherein the weight ratio of said acid to lignin is in the range of about 1:0.1-5; wherein said carboxylic acid is a substantially linear aliphatic acid having at least one terminal carboxyl group in the form of acid, salt or mixtures thereof; and wherein said sulfoalkylated lignin has a molecular weight in the range of about 2,000-10,000 and which is substantially sulfoalkylated on the benzene ring of the lignin molecule in the position ortho to a hydroxy group and the sulfonate group is attached to the ortho position by an alkylidene radical having one to three carbon atoms.
Claim 2
Dependent Claim
142 words
A non-gelling hydraulic cement composition having a high degree of predictability containing a retarder for controlling rheology and setting time of hydraulic cement comprising a mixture of hydraulic cement, at least one water soluble hydroxy carboxylic acid and a low molecular weight sulfoalkylated lignin; wherein the weight ratio of said acid to lignin is in the range of about 1:0.1-5; wherein said carboxylic acid is a substantially linear aliphatic acid having at least one terminal carboxyl group in the form of acid, salt or mixtures thereof; and wherein said sulfoalkylated lignin has a molecular weight in the range of about 2,000-10,000 and which is substantially sulfoalkylated on the benzene ring of the lignin molecule in the position ortho to a hydroxy group and the sulfonate group is attached to the ortho position by an alkylidene radical having one to three carbon atoms.
Claim 3
Dependent Claim
161 words
A non-gelling hydraulic cement composition having a high degree of predictability containing a retarder for controlling rheology and setting time of hydraulic cement comprising an aqueous slurry of hydraulic cement mixed with up to about 2% by weight on a dry cement basis of a retarder consisting essentially of at least one water soluble hydroxy carboxylic acid and a low molecular weight sulfoalkylated lignin; wherein the weight ratio of acid to lignin is in the range of about 1:0.1-5; wherein said carboxylic acid is a substantially linear aliphatic acid having at least one terminal carboxyl group in the form of acid, salt or mixtures thereof; and wherein said sulfoalkylated lignin has a molecular weight in the range of about 2,000-10,000 and which is substantially sulfoalkylated on the benzene ring of the lignin molecule in the position ortho to a hydroxy group and the sulfonate group is attached to the ortho position by an alkylidene radical having one to three carbon atoms.
Claim 4
Dependent Claim
161 words
A non-gelling hydraulic cement composition having a high degree of predictability containing a retarder for controlling rheology and setting time of hydraulic cement comprising an aqueous slurry of hydraulic cement mixed with up to about 2% by weight on a dry cement basis of a retarder consisting essentially of at least one water soluble hydroxy carboxylic acid and a low molecular weight sulfoalkylated lignin; wherein the weight ratio of acid to lignin is in the range of about 1:0.1-5; wherein said carboxylic acid is a substantially linear aliphatic acid having at least one terminal carboxyl group in the form of acid, salt or mixtures thereof; and wherein said sulfoalkylated lignin has a molecular weight in the range of about 2,000-10,000 and which is substantially sulfoalkylated on the benzene ring of the lignin molecule in the position ortho to a hydroxy group and the sulfonate group is attached to the ortho position by an alkylidene radical having one to three carbon atoms.
References Cited (Backward Citations)
US3723145A
Cited
US3931083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |