Patent US3952805A successfully refreshed from Google Patents.
US3952805A
Expired / Lapsed
US
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Well cementing method using a composition having improved flow properties, containing sulfonated copolymers of styrene-maleic anhydride
Assignee: Calgon Corp
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Filing: 1975-02-27
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Granted: 1976-04-27
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Expires: 1995-02-27
Abstract
Abstract Aqueous hydraulic cement compositions containing sulfonated copolymers of styrene-maleic anhydride as flow-property-improving and turbulence-inducing additives and their use in cementing wells is disclosed.
Inventors
- 👤 Leonard J. Persinski
- 👤 Fred David Martin
- 👤 Sally Lee Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:18
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C04; C04B; C04B24/00; C04B24/16; C04B24/20; C04B24/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
In the method of cementing a well comprising the step of pumping an aqueous hydraulic cement slurry into place in the annular space between the well casing and the well bore-hole, the improvement comprising employing therein an aqueous hydraulic cement slurry composition having improved flow properties comprising dry hydraulic cement in admixture with from about 0.01 to about 5.0 percent by weight, based on weight of dry hydraulic cement, of a copolymer of randomly repeating units of the following formulas: ##EQU5## where M is hydrogen, ammonium or alkali metal ion, and n is an integer of 1 to 3; and sufficient water to make a pumpable slurry which is capable of setting to form a monolithic solid.
Claim 2
Dependent Claim
117 words
In the method of cementing a well comprising the step of pumping an aqueous hydraulic cement slurry into place in the annular space between the well casing and the well bore-hole, the improvement comprising employing therein an aqueous hydraulic cement slurry composition having improved flow properties comprising dry hydraulic cement in admixture with from about 0.01 to about 5.0 percent by weight, based on weight of dry hydraulic cement, of a copolymer of randomly repeating units of the following formulas: ##EQU5## where M is hydrogen, ammonium or alkali metal ion, and n is an integer of 1 to 3; and sufficient water to make a pumpable slurry which is capable of setting to form a monolithic solid.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the copolymer has a molecular weight of from 3,000 to 10,000.
Claim 4
Dependent Claim
42 words
The method of claim 1 wherein for the said cement slurry composition employed therein, the copolymer is admixed with the hydraulic cement in an amount of from about 0.1 to about 2.0 percent by weight, based on weight of dry hydraulic cement.
Claim 5
Dependent Claim
38 words
The method of claim 1 wherein for the said cement slurry composition employed therein, the water is present in an amount of from about 25 to about 60 percent by weight, based on weight of dry hydraulic cement.
Claim 6
Dependent Claim
142 words
In the method of cementing a well, comprising the step of pumping into place in the annular space between the well casing and the well bore-hole an aqueous hydraulic cement slurry which is flowing in turbulence for the purpose of removing any drilling fluid filter cake accumulated on the well bore-hole surface, the improvement comprising employing therein an aqueous hydraulic cement slurry composition being more readily induced to flow in turbulence, comprising dry hydraulic cement in admixture with from about 0.01 to about 5.0 percent by weight, based on weight of dry hydraulic cement, of a copolymer of randomly repeating units of the following formulas: ##EQU6## where M is hydrogen, ammonium or alkali metal ion, and n is an integer of 1 to 3; and sufficient water to make a pumpable slurry which is capable of setting to form a monolithic solid.
Claim 7
Dependent Claim
142 words
In the method of cementing a well, comprising the step of pumping into place in the annular space between the well casing and the well bore-hole an aqueous hydraulic cement slurry which is flowing in turbulence for the purpose of removing any drilling fluid filter cake accumulated on the well bore-hole surface, the improvement comprising employing therein an aqueous hydraulic cement slurry composition being more readily induced to flow in turbulence, comprising dry hydraulic cement in admixture with from about 0.01 to about 5.0 percent by weight, based on weight of dry hydraulic cement, of a copolymer of randomly repeating units of the following formulas: ##EQU6## where M is hydrogen, ammonium or alkali metal ion, and n is an integer of 1 to 3; and sufficient water to make a pumpable slurry which is capable of setting to form a monolithic solid.
Claim 8
Dependent Claim
17 words
The method of claim 5 wherein the copolymer has a molecular weight of from 3,000 to 10,000.
Claim 9
Dependent Claim
42 words
The method of claim 5 wherein for the said cement slurry composition employed therein, the copolymer is admixed with the hydraulic cement in an amount of from about 0.1 to about 2.0 percent by weight, based on weight of dry hydraulic cement.
Claim 10
Dependent Claim
38 words
The method of claim 5 wherein for the said cement slurry composition employed therein, the water is present in an amount of from about 25 to about 60 percent by weight, based on weight of dry hydraulic cement.
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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |