US4137093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Setting retarding composition for well cementing and recementing
Assignee: Mexican Institute of Petroleum
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Filing: 1977-07-11
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Granted: 1979-01-30
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Expires: 1997-07-11
Abstract
Abstract The present invention relates to an improved composition that retards setting in the cementing and recementing of oil well casings, which can be applied at depths that vary between 13123.4 and 21325.5 ft.
Inventors
- 👤 Raul Poblano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:28
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C04; C04B; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
An improved setting retarding composition for cementing and recementing of wells, which comprises: from 13 to 17% by weight of carboxymethyl cellulose, from 20 to 23% by weight of sodium tetraborate, from 25 to 27% by weight of dextrine; characterized in that it also contains from 35.0 to 40% by weight of boric acid.
Claim 2
Dependent Claim
54 words
An improved setting retarding composition for cementing and recementing of wells, which comprises: from 13 to 17% by weight of carboxymethyl cellulose, from 20 to 23% by weight of sodium tetraborate, from 25 to 27% by weight of dextrine; characterized in that it also contains from 35.0 to 40% by weight of boric acid.
Claim 3
Dependent Claim
35 words
An improved setting retarding composition for cementing and recementing of wells according to claim 1, characterized in that it comprises: 14.60% of carboxymethylcellulose, 21.86% of sodium tetraborate, 27.4% of dextrine and 36.5% of boric acid.
Claim 4
Dependent Claim
28 words
An improved setting retarding composition for cementing and recementing of wells according to claim 1, characterized in that the carboxymethyl cellulose is preferably sodium or potassium carboxymethyl cellulose.
Claim 5
Dependent Claim
28 words
An improved setting retarding composition for cementing and recementing of wells according to claim 2, characterized in that the carboxymethyl cellulose is preferably sodium or potassium carboxymethyl cellulose.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |