US4140639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clay-free wellbore fluid
Assignee: Brinadd Co
•
Filing: 1977-02-28
•
Granted: 1979-02-20
•
Expires: 1997-02-28
Abstract
Abstract A clay-free, i.e., non-argillaceous brine wellbore fluid having unstructured viscosity and improved water loss properties from an additive composition present in an amount of 0.1 to 3 weight % based on wellbore fluid and consisting essentially of 15 to 95 weight % of guar gum or hydroxyalkyl guar gum and 5 to 85 weight % of a water soluble salt, preferably alkaline earth salt of lignosulfonate.
Inventors
- 👤 Jack M. Jackson, deceased
- 👤 executrix by Betty A. Jackson
- 👤 Executor By First City National Bank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:38
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/06; C09K8/08; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S507/925
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
An additive composition for use in clay-free non-thixotropic, brine wellbore fluids having improved fluid loss properties consisting essentially of from 15 to 95 weight percent hydroxyalkyl guar gum selected from the group consisting of hydroxyethyl guar gum and hydroxypropyl guar gum and from 5 to 85 weight percent of an alkaline earth metal salt of lignosulfonate.
Claim 2
Dependent Claim
56 words
An additive composition for use in clay-free non-thixotropic, brine wellbore fluids having improved fluid loss properties consisting essentially of from 15 to 95 weight percent hydroxyalkyl guar gum selected from the group consisting of hydroxyethyl guar gum and hydroxypropyl guar gum and from 5 to 85 weight percent of an alkaline earth metal salt of lignosulfonate.
Claim 3
Dependent Claim
35 words
The additive composition according to claim 1 consisting essentially of 25 to 75 weight percent of said hydroxyalkyl guar gum and from 25 to 75 weight percent of said alkaline earth metal salt of lignosulfonate.
Claim 4
Dependent Claim
14 words
The additive composition according to claim 1 wherein said lignosulfonate salt is calcium lignosulfonate.
Claim 5
Dependent Claim
11 words
The additive composition according to claim 3 containing hydroxypropyl guar gum.
Claim 6
Dependent Claim
70 words
A clay-free non-thixotropic, brine wellbore fluid comprising at least 1% of a soluble salt of potassium, sodium or calcium in water and a water loss reducing amount of an additive composition consisting essentially of 15 to 95 weight percent hydroxyalkyl guar gum selected from the group consisting of hydroxyethyl guar gum and hydroxypropyl guar gum and from 5 to 85 weight percent of an alkaline earth metal salt of lignosulfonate.
Claim 7
Dependent Claim
70 words
A clay-free non-thixotropic, brine wellbore fluid comprising at least 1% of a soluble salt of potassium, sodium or calcium in water and a water loss reducing amount of an additive composition consisting essentially of 15 to 95 weight percent hydroxyalkyl guar gum selected from the group consisting of hydroxyethyl guar gum and hydroxypropyl guar gum and from 5 to 85 weight percent of an alkaline earth metal salt of lignosulfonate.
Claim 8
Dependent Claim
28 words
The brine well bore fluid according to claim 5 containing from about 0.1 to 3 weight percent of said additive composition, based on the weight of wellbore fluid.
Claim 9
Dependent Claim
39 words
The brine wellbore fluid according to claim 5 wherein said additive composition consist essentially of from 25 to 75 weight percent hydroxyalkyl guar gum and from 25 to 75 weight percent of said alkaline earth metal salt of lignosulfonate.
Claim 10
Dependent Claim
17 words
The brine wellbore fluid according to claim 5 wherein said hydroxyalkyl guar gum is hydroxyethyl guar gum.
Claim 11
Dependent Claim
15 words
The brine wellbore fluid according to claim 5 wherein said lignosulfonate salt is calcium lignosulfonate.
Claim 12
Dependent Claim
12 words
The brine wellbore fluid according to claim 9 containing hydroxypropyl guar gum.
References Cited (Backward Citations)
GB771110A
Cited
US2908597A
Cited
US3483121A
Cited
US3723408A
Cited
US3677961A
Cited
US3878110A
Cited
US4003838A
Cited
US3988246A
Cited
US4025443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |