Patent US4045357A successfully refreshed from Google Patents.
US4045357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxy-aluminum based drilling fluid
Assignee: Chevron USA Inc
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Filing: 1976-09-23
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Granted: 1977-08-30
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Expires: 1996-09-23
Abstract
Abstract The disclosure provides an aqueous hydroxy-aluminum drilling fluid having a ratio of hydroxy groups to aluminum atoms in the range of from 1.0 to 2.7 and a concentration of at least 0.5 molar and including an effective amount of a polymer selected from the group consisting of polyvinylpyrrolidone and polyvinyl alcohol and a corrosion inhibitor.
Inventors
- 👤 Marion G. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C09K8/06; C09K8/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
An aqueous drilling fluid comprising an aqueous hydroxy-aluminum solution having a ratio of the hydroxyl groups to aluminum atoms in the range of from 1.0 to 2.7 and a concentration of at least 0.5 molar, from 0.1 to 0.5% by weight of a polymer selected from the group consisting of polyvinylpyrrolidone and polyvinyl alcohol for viscosity control and an effective amount of a polyalkyl substituted nitrogen containing heterocyclic compound for corrosion control.
Claim 2
Dependent Claim
72 words
An aqueous drilling fluid comprising an aqueous hydroxy-aluminum solution having a ratio of the hydroxyl groups to aluminum atoms in the range of from 1.0 to 2.7 and a concentration of at least 0.5 molar, from 0.1 to 0.5% by weight of a polymer selected from the group consisting of polyvinylpyrrolidone and polyvinyl alcohol for viscosity control and an effective amount of a polyalkyl substituted nitrogen containing heterocyclic compound for corrosion control.
Claim 3
Dependent Claim
81 words
An aqueous drilling fluid for use at temperatures of less than 180° F comprising an aqueous hydroxy-aluminum solution having a ratio of the hydroxyl groups to aluminum atoms in the range of from 2.0 to 2.5 and a concentration of at least 1 molar, from 0.1 to 0.5% by weight of a polymer selected from the group consisting of polyvinylpyrrolidone and polyvinyl alcohol for viscosity control and an effective amount of a polyalkyl substituted nitrogen containing heterocyclic compound for corrosion control.
Claim 4
Dependent Claim
81 words
An aqueous drilling fluid for use at temperatures of less than 180° F comprising an aqueous hydroxy-aluminum solution having a ratio of the hydroxyl groups to aluminum atoms in the range of from 2.0 to 2.5 and a concentration of at least 1 molar, from 0.1 to 0.5% by weight of a polymer selected from the group consisting of polyvinylpyrrolidone and polyvinyl alcohol for viscosity control and an effective amount of a polyalkyl substituted nitrogen containing heterocyclic compound for corrosion control.
Claim 5
Dependent Claim
81 words
An aqueous drilling fluid for use at temperatures above 180° F comprising an aqueous hydroxy-aluminum solution having a ratio of the hydroxyl groups to aluminum atoms in the range of from 1.0 to 2.2 and a concentration of at least 1 molar, from 0.1 to 0.5% by weight of a polymer selected from the group consisting of polyvinylpyrrolidone and polyvinyl alcohol for viscosity control and at least 0.25% by weight of a polyalkyl substituted nitrogen containing heterocyclic compound for corrosion control.
Claim 6
Dependent Claim
81 words
An aqueous drilling fluid for use at temperatures above 180° F comprising an aqueous hydroxy-aluminum solution having a ratio of the hydroxyl groups to aluminum atoms in the range of from 1.0 to 2.2 and a concentration of at least 1 molar, from 0.1 to 0.5% by weight of a polymer selected from the group consisting of polyvinylpyrrolidone and polyvinyl alcohol for viscosity control and at least 0.25% by weight of a polyalkyl substituted nitrogen containing heterocyclic compound for corrosion control.
References Cited (Backward Citations)
US3025234A
Cited
US3077454A
Cited
US3603399A
Cited
US3833718A
Cited
US3827500A
Cited
US3843524A
Cited
US3762485A
Cited
US3872018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |