Patent US5152906A successfully refreshed from Google Patents.
US5152906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clay stabilizing composition for oil and gas well treatment
Assignee: Ecolab USA Inc
•
Filing: 1991-11-12
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Granted: 1992-10-06
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Expires: 2011-11-12
Abstract
Abstract A clay swelling inhibitor additive for oil and gas well treatment is disclosed. The additive comprises an aqueous solution of tetraalkylammonium chloride, preferably tetramethylammonium chloride and a quaternary amine-based cationic polyelectrolyte, such as methyl chloride quaternary salt of ethylene-ammonia condensation polymer. The additive composition synergistically retards water absorption by the down-hole clay formation.
Inventors
- 👤 Carl W. Aften
- 👤 Robert K. Gabel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:20
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/607; C09K8/608; C09K8/02; C09K8/03; C09K8/035; Y; Y10; Y10S; Y10S507/00; Y10S507/922
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
22 words
A stimulation fluid comprising an aqueous solution of: (a) tetraalkylammonium chloride; (b) a quaternary amine-based cationic polyelectrolyte; and (c) a viscosifying agent.
Claim 2
Dependent Claim
22 words
A stimulation fluid comprising an aqueous solution of: (a) tetraalkylammonium chloride; (b) a quaternary amine-based cationic polyelectrolyte; and (c) a viscosifying agent.
Claim 3
Dependent Claim
24 words
The stimulation fluid of claim 1, wherein said tetraalkylammonium chloride comprises from about 1.25 to about 30 pounds per 1000 gallons of said fluid.
Claim 4
Dependent Claim
24 words
The stimulation fluid of claim 1, wherein said tetraalkylammonium chloride comprises from about 2.5 to about 15 pounds per 1000 gallons of said fluid.
Claim 5
Dependent Claim
23 words
The stimulation fluid of claim 1, wherein said polyelectrolyte comprises from about 0.3 to about 10 pounds per 1000 gallons of said fluid.
Claim 6
Dependent Claim
22 words
The stimulation of claim 1, wherein said polyelectrolyte comprises from about 0.6 to about 5 pounds per 1000 gallons of said fluid.
Claim 7
Dependent Claim
21 words
The stimulation fluid of claim 1, wherein said polyelectrolyte has a molecular weight of from about 10,000 to about 50,000 daltons.
Claim 8
Dependent Claim
34 words
The stimulation fluid of claim 1, wherein said polyelectrolyte is selected from a group consisting of poly(diallyldimethylammonium chloride), poly(methacrylamidopropyltrimethylammonium chloride), poly(acrylic aciddiallyldimethylammonium chloride-hydroxypropylacrylate) and a methyl chloride quaternary salt of ethylene dichloride-ammonia condensation polymer.
Claim 9
Dependent Claim
13 words
The stimulation fluid of claim 1, wherein said tetraalkylammonium chloride comprises tetramethylammonium chloride.
Claim 10
Dependent Claim
26 words
The stimulation fluid of claim 1, wherein said tetraalkylammonium chloride has from 1 to 3 short alkyl groups and from 1 to 3 long alkyl groups.
Claim 11
Dependent Claim
33 words
The stimulation fluid of claim 9, wherein said short alkyl groups comprise from 1 to about 4 carbon atoms and said long alkyl groups comprise from about 5 to about 20 carbon atoms.
Claim 12
Dependent Claim
29 words
The stimulation fluid of claim 1, wherein said viscosifying agent is present in an amount of from about 100 to about 600 pounds per 1000 gallons of said fluid.
Claim 13
Dependent Claim
33 words
A composition suitable as an additive in a down-hole fluid for inhibiting clay swelling in a down-hole formation, comprising an aqueous solution of: (a) tetraalkylammonium chloride; and (b) a quaternary amine-based cationic polyelectrolyte.
Claim 14
Dependent Claim
33 words
A composition suitable as an additive in a down-hole fluid for inhibiting clay swelling in a down-hole formation, comprising an aqueous solution of: (a) tetraalkylammonium chloride; and (b) a quaternary amine-based cationic polyelectrolyte.
Claim 15
Dependent Claim
22 words
The composition of claim 12, wherein said tetraalkylammonium chloride comprises from about 10 to about 60 percent by weight of the additive.
Claim 16
Dependent Claim
22 words
The composition of claim 12, wherein said tetraalkylammonium chloride comprises from about 20 to about 50 percent by weight of the additive.
Claim 17
Dependent Claim
21 words
The composition of claim 12, wherein said polyelectrolyte comprises from about 1 to about 20 percent by weight of the additive.
Claim 18
Dependent Claim
21 words
The composition of claim 12, wherein said polyelectrolyte comprises from about 2 to about 10 percent by weight of the additive.
Claim 19
Dependent Claim
33 words
The composition of claim 12, wherein said cationic polyelectrolyte is selected from the group consisting of poly(diallyldimethylammonium chloride), poly(methacrylamidopropyltrimethylammonium chloride), poly(acrylic aciddiallyldimethylammonium chloride-hydroxypropylacrylate) and methyl chloride quaternary salt of ethylene dichloride-ammonia condensation polymer.
Claim 20
Dependent Claim
22 words
The composition of claim 12, wherein said polyelectrolyte has a weight average molecular weight of from about 5,000 to about 250,000 daltons.
Claim 21
Dependent Claim
12 words
The composition of claim 12, wherein said tetraalkylammonium chloride comprises tetramethylammonium chloride.
Claim 22
Dependent Claim
25 words
The composition of claim 12, wherein said tetraalkylammonium chloride has from 1 to 3 short alkyl groups and from 1 to 3 long alkyl groups.
Claim 23
Dependent Claim
32 words
The composition of claim 20, wherein said short alkyl groups comprise from 1 to about 4 carbon atoms and said long alkayl groups comprise from about 5 to about 20 carbon atoms.
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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) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |