US4190110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cementing wellbores using high temperature cement mud spacer
Assignee: BJ Services Co USA
•
Filing: 1978-05-19
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Granted: 1980-02-26
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Expires: 1998-05-19
Abstract
Abstract A spacer composition for use in borehole cementing operations is disclosed which has excellent high temperature stability and compatability with cement slurries and drilling fluids. The spacer composition comprises a single phase water base system containing stabilized attapulgite clay.
Inventors
- 👤 Robert M. Beirute
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:03
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/424; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A method for cementing wellbores which contain a drilling fluid comprising introducing an amount of a spacer composition into said wellbore prior to introduction of the cement composition, said spacer composition being present in an amount effective to prevent contact of said cement with said drilling fluid and said spacer composition comprising an aqueous suspension of attapulgite clay stabilized with an effective amount of zinc oxide and having a pH of at least about 7.
Claim 2
Independent Claim
75 words
A method for cementing wellbores which contain a drilling fluid comprising introducing an amount of a spacer composition into said wellbore prior to introduction of the cement composition, said spacer composition being present in an amount effective to prevent contact of said cement with said drilling fluid and said spacer composition comprising an aqueous suspension of attapulgite clay stabilized with an effective amount of zinc oxide and having a pH of at least about 7.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said spacer composition has a pH of from about 8 to about 10.
Claim 4
Dependent Claim
45 words
The method of claim 1 wherein said spacer composition is introduced into said wellbore by pumping it down the center of the casing to thereby pass from the bottom outlet thereof and displace said drilling fluid in the annulus between the casing and the wellbore.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein said spacer composition is introduced into said wellbore by pumping it down the annulus between the casing and the wellbore, thereby displacing the drilling fluid up into said casing.
Claim 6
Dependent Claim
27 words
The method of claim 1 wherein said spacer composition comprises a weighting agent so as to have a weight of from about 8 to about 22 lbs/gal.
Claim 7
Dependent Claim
36 words
The method of claim 1 wherein said spacer composition further comprises additives selected from the group consisting of cement retardants, cement accelerators, surfactants, and mixtures thereof to thereby achieve desired properties for specified wellbore cementing conditions.
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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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |