US4025443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clay-free wellbore fluid
Assignee: Individual
•
Filing: 1975-03-17
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Granted: 1977-05-24
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Expires: 1995-03-17
Abstract
Abstract A clay-free, i.e., non-argillaceous wellbore fluid, having unstructured viscosity is obtained by combining water with an additive composition comprising hydroxy alkyl guar gum and at least 10 weight percent of magnesia or magnesium hydroxide based on the weight of hydroxy alkyl guar gum.
Inventors
- 👤 Jack M. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:21
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035; C09K8/04; C09K8/06; C09K8/08; Y; Y10; Y10S; Y10S507/00; Y10S507/925
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
A wellbore fluid additive viscosifying composition having improved viscosity stability in wellbore fluids for use in clay-free non-argillaceous aqueous brine fluids which contain at least 1.0% by weight of a soluble salt of potassium, sodium or calcium consisting essentially of hydroxyalkyl guar gum selected from the group consisting of hydroxyl ethyl guar gum, hydroxy propyl guar gum and hydroxy butyl guar gum and at least about 10 weight percent of magnesia or magnesium hydroxide based on hydroxy alkyl guar gum.
Claim 2
Dependent Claim
80 words
A wellbore fluid additive viscosifying composition having improved viscosity stability in wellbore fluids for use in clay-free non-argillaceous aqueous brine fluids which contain at least 1.0% by weight of a soluble salt of potassium, sodium or calcium consisting essentially of hydroxyalkyl guar gum selected from the group consisting of hydroxyl ethyl guar gum, hydroxy propyl guar gum and hydroxy butyl guar gum and at least about 10 weight percent of magnesia or magnesium hydroxide based on hydroxy alkyl guar gum.
Claim 3
Dependent Claim
10 words
The composition according to claim 1 wherein magnesia is present.
Claim 4
Dependent Claim
11 words
The composition according to claim 1 wherein magnesium hydroxide is present.
Claim 5
Dependent Claim
20 words
The composition according to claim 1 wherein from about 28 to 50 weight percent magnesia or magnesium hydroxide is present.
Claim 6
Dependent Claim
15 words
A wellbore fluid additive viscosifying composition according to claim 1 containing hydroxy ethyl guar gum.
Claim 7
Dependent Claim
15 words
A wellbore fluid additive viscosifying composition according to claim 1 containing hydroxy propyl guar gum.
Claim 8
Dependent Claim
15 words
A wellbore fluid additive viscosifying composition according to claim 1 containing hydroxy butyl guar gum.
Claim 9
Dependent Claim
76 words
A clay-free, non-argillaceous wellbore fluid having improved viscosity stability comprising water, at least 1.0% by weight of a soluble salt of potassium, sodium or calcium, a viscosifying amount of 0.5 to 5 pounds of hydroxyalkyl guar gum selected from the group consisting of hydroxy ethyl guar gum, hydroxy propyl guar gum and hydroxy butyl guar gum per barrel of water and at least 10 weight percent of magnesia or magnesium hydroxide based on hydroxyalkyl guar gum.
Claim 10
Dependent Claim
76 words
A clay-free, non-argillaceous wellbore fluid having improved viscosity stability comprising water, at least 1.0% by weight of a soluble salt of potassium, sodium or calcium, a viscosifying amount of 0.5 to 5 pounds of hydroxyalkyl guar gum selected from the group consisting of hydroxy ethyl guar gum, hydroxy propyl guar gum and hydroxy butyl guar gum per barrel of water and at least 10 weight percent of magnesia or magnesium hydroxide based on hydroxyalkyl guar gum.
Claim 11
Dependent Claim
15 words
The wellbore fluid according to claim 8 containing a lignosulfonate salt fluid loss reducing additive.
Claim 12
Dependent Claim
12 words
A wellbore fluid according to claim 8 containing hydroxy ethyl guar gum.
Claim 13
Dependent Claim
12 words
A wellbore fluid according to claim 8 containing hydroxy propyl guar gum.
Claim 14
Dependent Claim
12 words
A wellbore fluid according to claim 8 containing hydroxy butyl guar gum.
Claim 15
Dependent Claim
21 words
The wellbore fluid according to claim 8 wherein from about 28 to 50 weight percent magnesia or magnesium hydroxide is present.
Claim 16
Dependent Claim
11 words
The wellbore fluid according to claim 13 wherein magnesia is present.
Claim 17
Dependent Claim
12 words
The wellbore fluid according to claim 13 wherein magnesium hydroxide is present.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |