US6822039B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Invertible emulsions stabitised by amphiphilic polymers and application to bore fluids
Assignee: MI LLC
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Filing: 1998-11-23
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Granted: 2004-11-23
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Expires: 2018-11-23
Abstract
Abstract The invention concerns modified hydrophobic polyelectrolytes by amide formation of a hydrophilic skeleton by n-alkylamines whereof the alkyl chain comprises 6 to 22 carbon atoms. Preferably, the amide formation is obtained by di-n-dodecylamine. The hydrophilic skeleton is preferably a sodium polyacrylate or polyacrylic acid corresponding to a statistical acrylate-AMPS copolymer. Said polymers can be used for stabilising direct or invert emulsions likely to be destabilised or inverted by a modification in the degree of salinity of the aqueous phase or a pH modification. The invention is particularly useful for stabilising oil drilling fluids or the like in particular drilling, fracturation, acidification or completion fluids.
Inventors
- 👤 Nathalie Monfreux-Gaillard
- 👤 Patrick Perrin
- 👤 Françoise LaFuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:22
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26; C09K8/28; C09K8/32; C09K8/36; C09K8/60; C09K8/62; C09K8/72; C09K8/74
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
An emulsion composition comprising an oleaginous fluid, a non-oleaginous fluid, and a polymeric surfactant, wherein the polymeric surfactant is a polyelectrolyte which has a hydrophilic backbone that has been amidified by di-n-alkylamine in which the alkyl chains contain 6 to 22 carbons, and wherein the polymeric surfactant is in amounts sufficient to form an emulsion.
Claim 2
Dependent Claim
55 words
An emulsion composition comprising an oleaginous fluid, a non-oleaginous fluid, and a polymeric surfactant, wherein the polymeric surfactant is a polyelectrolyte which has a hydrophilic backbone that has been amidified by di-n-alkylamine in which the alkyl chains contain 6 to 22 carbons, and wherein the polymeric surfactant is in amounts sufficient to form an emulsion.
Claim 3
Dependent Claim
58 words
The composition of claim 1 , wherein the hydrophilic polymer backbone is a homopolymer or copolymer based on monomers selected from the group consisting of acrylic acid, methacrylic acid, beta-alkyl acrylic acid, esters of acrylic acid, methacrylic acid, beta-alkylacrylic acid and monoalkyleneglycol or polyalkyleneglycol, acrylamide, methacrylamide, vinylpyrrolidone, itaconic acid, maleic acid, 2-acrylamido-4-sulfonic acid (AMPS) or vinyl sulfonic acid.
Claim 4
Dependent Claim
15 words
The composition of claim 1 , wherein the hydrophilic polymer backbone is a sodium polyacrylate.
Claim 5
Dependent Claim
23 words
The composition of claim 3 , wherein the mass average molecular mass of the sodium polyacrylate is in the range 50,000 to 2,000,000.
Claim 6
Dependent Claim
23 words
The composition of claim 3 , wherein the mass average molecular mass of the sodium polyacrylate is in the range 100,000 to 1,500,000.
Claim 7
Dependent Claim
20 words
The composition of claim 1 , wherein the hydrophillic backbone is a statistical copolymer of an acrylate and 2-acrylamido-2-methylpropanesulfonic acid.
Claim 8
Dependent Claim
11 words
The composition of claim 1 , wherein the di-n-alkylamine is di-n-dodecylamine.
Claim 9
Dependent Claim
30 words
The composition of claim 1 , wherein the effective degree of modification of the polymer is in the range 0.10 to 0.50 moles of di-n-alkylamine per mole of hydrophilic polymer.
Claim 10
Dependent Claim
13 words
The composition of claim 1 , wherein the emulsion is an invert emulsion.
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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) | 2007-11-23 | 2008-05-24 | 2008-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-11-23 | 2012-05-24 | 2012-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-11-23 | 2016-05-24 | 2016-11-23 | $7700.00 | Window Closed / Lapsed |