US4462837A
Expired / Lapsed
US
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Cement composition and method of cement casing in a well
Assignee: Chevron USA Inc
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Filing: 1983-02-15
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Granted: 1984-07-31
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Expires: 2003-02-15
Abstract
Abstract A novel cement composition for the preparation of a novel aqueous slurry useful in cementing casing in the borehole of a well comprising (1) cement, (2) (a) a hydroxyethylcellulose ether having a critical viscosity or (2) (b) a mixture of a hydroxyethylcellulose ether having a critical viscosity and of a hydroxypropylcellulose ether having a critical viscosity and (3) a dispersant.
Inventors
- 👤 Wilford S. Baker
- 👤 James J. Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:56
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C09K8/467; C09K8/487; C04B2103/00; C04B2103/46
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
164 words
A novel cement composition for the preparation of a novel aqueous slurry useful in cementing casing in the borehole of a well comprising (1) cement, (2) (a) a hydroxyethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less then about 6000 centipoises when measured in a one weight percent aqueous solution or (2) (b) a mixture of a hydroxyethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution and a hydroxypropylcellulose ether having a viscosity above about 100 centipoises when measured in a two weight percent aqueous solution, but less than about 10,000 centipoises when measured in a one weight percent aqueous solution, wherein said hydroxypropylcellulose ether is present in an amount up to about 20 weight percent based on the total weight of said hydroxyalkylcellulose ethers, and (3) a dispersant.
Claim 2
Dependent Claim
164 words
A novel cement composition for the preparation of a novel aqueous slurry useful in cementing casing in the borehole of a well comprising (1) cement, (2) (a) a hydroxyethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less then about 6000 centipoises when measured in a one weight percent aqueous solution or (2) (b) a mixture of a hydroxyethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution and a hydroxypropylcellulose ether having a viscosity above about 100 centipoises when measured in a two weight percent aqueous solution, but less than about 10,000 centipoises when measured in a one weight percent aqueous solution, wherein said hydroxypropylcellulose ether is present in an amount up to about 20 weight percent based on the total weight of said hydroxyalkylcellulose ethers, and (3) a dispersant.
Claim 3
Dependent Claim
47 words
The composition of claim 1 comprising (1) cement, (2) a hydroxyethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution, and (3) a dispersant.
Claim 4
Dependent Claim
31 words
The composition of claim 2 wherein said hydroxyethylcellulose ether has a viscosity in the range of about 100 to about 10,000 centipoises when measured in a two weight percent aqueous solution.
Claim 5
Dependent Claim
85 words
The composition of claim 1 comprising (1) cement, (2) a mixture of a hydroxyethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution and a hydroxypropylcellulose ether having a viscosity above about 100 centipoises when measured in a two weight percent aqueous solution, but less than about 10,000 centipoises when measured in a one weight percent aqueous solution, and (3) a dispersant.
Claim 6
Dependent Claim
54 words
The composition of claim 4 wherein said hydroxyethylcellulose ether has a viscosity in the range of about 1000 to about 10,000 centipoises when measured in a two weight percent aqueous solution and said hydroxypropylcellulose ether has a viscosity of about 1000 to about 3000 centipoises when measured in a one weight percent aqueous solution.
Claim 7
Dependent Claim
32 words
The composition of claim 4 wherein said hydroxypropylcellulose ether is present in an amount ranging from about five to about 20 weight percent, based on the total weight of the hydroxyalkylcellulose ethers.
Claim 8
Dependent Claim
32 words
The composition of claim 5 wherein said hydroxypropylcellulose ether is present in an amount ranging from about five to about 20 weight percent, based on the total weight of the hydroxyalkylcellulose ethers.
Claim 9
Dependent Claim
24 words
The composition of claim 1 wherein the degree of substitution on said hydroxyalkylcellulose ethers is in the range of about 0.5 to about 3.0.
Claim 10
Dependent Claim
24 words
The composition of claim 1 wherein the degree of substitution on said hydroxyalkylcellulose ethers is in the range of about 0.9 to about 2.8.
Claim 11
Dependent Claim
23 words
The composition of claim 1 wherein the molar substitution of said hydroxyalkylcellulose ethers is in the range of about 0.5 to about 10.0.
Claim 12
Dependent Claim
23 words
The composition of claim 1 wherein the molar substitution of said hydroxyalkylcellulose ethers is in the range of about 1.0 to about 6.0.
Claim 13
Dependent Claim
16 words
The composition of claim 1 wherein the cement is selected from API Classes A through J.
Claim 14
Dependent Claim
16 words
The composition of claim 1 wherein the cement is selcted from API Classes H and J.
Claim 15
Dependent Claim
12 words
The composition of claim 1 wherein said dispersant is an anionic surfactant.
Claim 16
Dependent Claim
19 words
The composition of claim 1 wherein said dispersant is a sulfonic acid derivative of an aromatic or aliphatic hydrocarbon.
Claim 17
Dependent Claim
12 words
The composition of claim 1 wherein said dispersant is a polynaphthalene sulfonate.
Claim 18
Dependent Claim
16 words
The composition of claim 1 wherein said dispersant is a sodium naphthalene sulfonate formaldehyde condensation product.
Claim 19
Dependent Claim
16 words
The composition of claim 1 wherein said dispersant is a potassium naphthalene sulfonate formaldehyde condensation product.
Claim 20
Dependent Claim
43 words
The composition of claim 1 wherein said cement composition contains from about 0.01 to about 0.6 weight percent of said hydroxyalkylcellulose ethers and from about 0.01 to about 3.0 weight percent by weight of said dispersant, based on the weight of the cement.
Claim 21
Dependent Claim
43 words
The composition of claim 1 wherein said cement composition contains from about 0.1 to about 0.5 weight percent of said hydroxyalkylcellulose ethers and from about 0.1 to about 2.0 weight percent by weight of said dispersant, based on the weight of the cement.
Claim 22
Dependent Claim
26 words
The composition of claim 1 wherein the weight ratio of said dispersant to total hydroxyalkylcellulose ethers is in the range of about 10:1 to about 1:5.
Claim 23
Dependent Claim
26 words
The composition of claim 1 wherein the weight ratio of said dispersant to total hydroxyalkylcellulose ethers is in the range of about 5:1 to about 1:1.
Claim 24
Dependent Claim
55 words
An aqueous cement slurry prepared using the novel cement composition of claim 1 containing from about 0.01 to about 0.6 weight percent of said hydroxyalkylcellulose ethers, from about 0.01 to about 3.0 weight percent of said dispersant and from about 25 to about 80 weight percent of water, based on the weight of the cement.
Claim 25
Dependent Claim
49 words
The aqueous cement slurry of claim 23 containing from about 0.01 to about 0.5 weight percent of said hydroxyalkylcellulose ethers, from about 0.1 to about 2.0 weight percent of said dispersant and from about 35 to about 70 weight percent of water, based on the weight of the cement.
Claim 26
Dependent Claim
22 words
The aqueous cement slurry of claim 23 that additionally contains up to about five weight percent of KCl by weight of water.
Claim 27
Dependent Claim
23 words
The aqueous cement slurry of claim 24 that additionally contains from about one to about five weight percent KCl by weight of water.
Claim 28
Independent Claim
213 words
A method of cementing casing in the borehole of a well comprising suspending the casing in the borehole, pumping downwardly into said casing an aqueous cement slurry comprising (1) water, (2) cement, (3) (a) a hydroxetylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution, or (3) (b) a mixture of a hydroxyethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution and a hydroxypropylcellulose ether having a viscosity of above about 100 centipoises when measured in a two weight percent aqueous solution, but less than about 10,000 centipoises when measured in a one weight percent aqueous solution, wherein said hydroxypropylcellulose ether is present in an amount up to about 20 weight percent based on the total weight of said hydroxyalkylcellulose ethers, and (4) a dispersant, then circulating said aqueous cement slurry upwardly into the annulus surounding said casing, continuing said circulation until said slurry fills that portion of the annular space desired to be sealed and then maintaining said slurry in place until the cement sets.
Claim 29
Independent Claim
213 words
A method of cementing casing in the borehole of a well comprising suspending the casing in the borehole, pumping downwardly into said casing an aqueous cement slurry comprising (1) water, (2) cement, (3) (a) a hydroxetylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution, or (3) (b) a mixture of a hydroxyethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution and a hydroxypropylcellulose ether having a viscosity of above about 100 centipoises when measured in a two weight percent aqueous solution, but less than about 10,000 centipoises when measured in a one weight percent aqueous solution, wherein said hydroxypropylcellulose ether is present in an amount up to about 20 weight percent based on the total weight of said hydroxyalkylcellulose ethers, and (4) a dispersant, then circulating said aqueous cement slurry upwardly into the annulus surounding said casing, continuing said circulation until said slurry fills that portion of the annular space desired to be sealed and then maintaining said slurry in place until the cement sets.
Claim 30
Dependent Claim
55 words
The process according to claim 27 wherein said aqueous cement slurry comprises (1) water, (2) cement, (3) a hydroxethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution, and (4) a dispersant.
Claim 31
Dependent Claim
37 words
The process according to claim 28 wherein said hydroxyethylcellulose ether in said aqueous cement slurry has a viscosity in the range of about 1000 to about 10,000 centipoises when measured in a two weight percent aqueous solution.
Claim 32
Dependent Claim
93 words
The process according to claim 27 wherein said aqueous cement slurry comprises (1) water, (2) cement, (3) a mixture of a hydroxethylcellulose ether having a viscosity above about 200 centipoises when measured in a five weight percent aqueous solution, but less than about 6000 centipoises when measured in a one weight percent aqueous solution and a hydroxypropylcellulose ether having a viscosity above about 100 centipoises when measured in a two weight percent aqueous solution, but less than about 10,000 centipoises when measured in a one weight percent aqueous solution, and (4) a dispersant.
Claim 33
Dependent Claim
60 words
The process according to claim 30 wherein said hydroxyethylcellulose ether in said aqueous cement slurry has a viscosity in the range of about 1000 to about 10,000 centipoises when measured in a two weight percent aqueous solution and said hydroxpropylcellulose ether has a viscosity of about 1000 to about 3000 centipoises when measured in a one weight percent aqueous solution.
Claim 34
Dependent Claim
38 words
The process according to claim 30 wherein said hydroxpropylcellulose ether in said aqueous cement slurry is present in an amount ranging from about five to about twenty weight percent based on the total weight of the hydroxyalkylcellulose ethers.
Claim 35
Dependent Claim
38 words
The process according to claim 31 wherein said hydroxpropylcellulose ether is present in said aqueous cement slurry in an amount ranging from about five to about twenty weight percent, based on the total weight of the hydroxyalkylcellulose ethers.
Claim 36
Dependent Claim
28 words
The process according to claim 27 wherein the substitution on said hydroxyalkylcellulose ethers in said aqueous cement slurry is in the range of about 0.5 to about 3.0.
Claim 37
Dependent Claim
30 words
The proces according to claim 27 but wherein the molar substitution of said hydroxyalkylcellulose ethers in said aqueous cement slurry is in the range of about 0.5 to about 10.0.
Claim 38
Dependent Claim
45 words
The process according to claim 27 wherein said aqueous cement slurry contains from about 0.01 to about 0.6 weight percent of said hydroxyalkylcellulose ethers and from about 0.01 to about 3.0 weight percent by weight of said dispersant, based on the weight of the cement.
Claim 39
Dependent Claim
45 words
The process according to claim 27 wherein said aqueous cement slurry contains from about 0.1 to about 0.5 weight percent of said hydroxyalkylcellulose ethers and from about 0.1 to about 2.0 weight percent by weight of said dispersant, based on the weight of the cement.
Claim 40
Dependent Claim
31 words
The process according to claim 27 wherein the amount of water in said aqueous cement slurry is from 25 to 80 weight percent water based on the weight of the cement.
Claim 41
Dependent Claim
24 words
The process according to claim 28 wherein the weight percent water based on the weight of the cement is from 35 to about 70.
Claim 42
Dependent Claim
25 words
The process according to claim 28 wherein said aqueous cement slurry contains additionally up to about five weight percent of KCl by weight of water.
Claim 43
Dependent Claim
15 words
The process according to claim 27 but wherein said aqueous cement slurry additionally contains KCl.
Claim 44
Dependent Claim
29 words
The process according to claim 27 wherein the passage of said aqueous cement slurry through said casing is preceded by passage therethrough of a lead-scavenger quantity of cement slurry.
Claim 45
Dependent Claim
14 words
The process according to claim 27 wherein said borehole is slanted from the vertical.
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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |