US4216022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well cementing in permafrost
Assignee: Atlantic Richfield Co
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Filing: 1979-05-18
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Granted: 1980-08-05
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Expires: 1999-05-18
Abstract
Abstract A composition for use in cementing a string of pipe or other apparatus in the permafrost region of a borehole of a well which composition is a dry cementitious mix which can be mixed with water on site for pumping into the wellbore and consists essentially of from about 40 to about 60 weight percent aluminate cement, from about 20 to about 30 weight percent alkaline earth metal sulfate, from about 10 to about 30 weight percent of at least one halide salt of an alkali metal and/or alkaline earth metal, from about 3 to about 8 weight percent attapulgite, from about 0.1 to about 1 weight percent of a mixture of at least one water soluble hydroxy carboxylic acid and a sulfoalkylated lignin, and from about 0.1 to about 1 weight percent of an alkali metal citrate.
Inventors
- 👤 William N. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:34
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C09; C09K; C09K8/00; C09K8/42; C09K8/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A cementitious mix for use in cementing in a permafrost region of a wellbore consisting essentially of from about 40 to about 60 weight percent aluminate cement, from about 20 to about 30 weight percent of at least one alkaline earth metal sulfate, from about 10 to about 30 weight percent of at least one halide salt of an alkali metal and/or alkaline earth metal, from about 3 to about 8 weight percent attapulgite, from about 0.1 to about 1 weight percent of a mixture of at least one water soluble hydroxy carboxylic acid and a sulfoalkylated lignin, and from about 0.1 to about 1 weight percent of at least one alkali metal citrate, all weight percents being based upon the total weight of the mix.
Claim 2
Dependent Claim
126 words
A cementitious mix for use in cementing in a permafrost region of a wellbore consisting essentially of from about 40 to about 60 weight percent aluminate cement, from about 20 to about 30 weight percent of at least one alkaline earth metal sulfate, from about 10 to about 30 weight percent of at least one halide salt of an alkali metal and/or alkaline earth metal, from about 3 to about 8 weight percent attapulgite, from about 0.1 to about 1 weight percent of a mixture of at least one water soluble hydroxy carboxylic acid and a sulfoalkylated lignin, and from about 0.1 to about 1 weight percent of at least one alkali metal citrate, all weight percents being based upon the total weight of the mix.
Claim 3
Dependent Claim
16 words
A cementitious mix according to claim 1 wherein said cement is essentially a calcium aluminate cement.
Claim 4
Dependent Claim
14 words
A cementitious mix according to claim 2 wherein said cement is essentially Fondu cement.
Claim 5
Dependent Claim
54 words
A cementitious mix according to claim 1 wherein said cement is essentially Fondu cement, said sulfate is calcium sulfate, said halide salt is sodium chloride, said salt of lignosulfonic acid is calcium sodium lignosulfonate, and said citrate is at least one selected from the group consisting of sodium citrate, potassium citrate, and lithium citrate.
Claim 6
Dependent Claim
106 words
A cementitious mix according to claim 1 wherein the weight ratio of said acid to lignin is in the range of about 1:0.1-5.0, wherein the carboxylic acid is a substantially linear aliphatic acid having at least one terminal carboxyl group in the form of acid, salt or mixtures thereof, 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 in the lignin molecule in the position ortho to the free phenolic 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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |