US4460758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drag reduction agents for aqueous salt solutions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-11-02
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Granted: 1984-07-17
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Expires: 2003-11-02
Abstract
Abstract The present invention relates to improved drag reduction agents for aqueous solutions which comprises a polymeric complex which is a terpolymer of acrylamide/metal styrene sulfonate/methacrylamidopropyltrimethyl ammonium chloride. The metal styrene sulfonate is an anionic monomer, while MAPTAC is cationically charged. These acrylamide-based polyampholytes have approximately 1 to about 50 mole % of the anionic monomer and approximately 1 to about 50 mole % of the cationic moiety present within the macromolecular structure. These groups are not necessarily present in an equimolar charge ratio. The excess undissociated charge allows for facile dispensability or solubility of the polyampholytes into fresh water.
Inventors
- 👤 Dennis G. Peiffer
- 👤 Robert D. Lundberg
- 👤 Ralph M. Kowalik
- 👤 S. Richard Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:54
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56; Y; Y10; Y10S; Y10S507/00; Y10S507/925; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
A terpolymer for use as a drag reducing agent, said terpolymer having the formula: ##STR3## wherein x is about 40 to about 98 mole %, y is about 1 to about 50 mole %, z is about 1 to about 50 mole %, wherein y and z are less than 60 mole %, and M is selected from the group consisting of amines and a metallic cation being selected from the group consisting of lead, iron, aluminum, Groups IA, IIA, IB and IIB of the Periodic Table of Elements.
Claim 2
Dependent Claim
89 words
A terpolymer for use as a drag reducing agent, said terpolymer having the formula: ##STR3## wherein x is about 40 to about 98 mole %, y is about 1 to about 50 mole %, z is about 1 to about 50 mole %, wherein y and z are less than 60 mole %, and M is selected from the group consisting of amines and a metallic cation being selected from the group consisting of lead, iron, aluminum, Groups IA, IIA, IB and IIB of the Periodic Table of Elements.
Claim 3
Dependent Claim
12 words
A terpolymer according to claim 1 wherein said terpolymer is water soluble.
Claim 4
Dependent Claim
10 words
A terpolymer according to claim 1 wherein M is sodium.
Claim 5
Dependent Claim
51 words
A terpolymer according to claim 1 wherein said terpolymer is dissolved in a salt solution at a concentration of about 0.001 to about 20 grams of terpolymer per 100 grams of water, said salt solution having about 0.001 to about 60 grams of salt per 100 grams of said salt solution.
Claim 6
Dependent Claim
51 words
A terpolymer according to claim 1 wherein said terpolymer is dissolved in an acid solution at a concentration of about 0.001 to about 20 grams of terpolymer per 100 grams of water, said acid solution having about 0.001 to about 30 grams of acid per 100 grams of said acid solution.
Claim 7
Dependent Claim
51 words
A terpolymer according to claim 1 wherein said terpolymer is dissolved in a base solution at a concentration of about 0.001 to about 20 grams of terpolymer per 100 grams of water, said base solution having about 0.001 to about 60 grams of base per 100 grams of said base solution.
Claim 8
Dependent Claim
18 words
A terpolymer according to claim 1 wherein said terpolymer possesses a nonstoichiometric amount of anionic and cationic groups.
Claim 9
Dependent Claim
17 words
A terpolymer according to claim 1 wherein said terpolymer is readily soluble or dispensible in fresh water.
Claim 10
Dependent Claim
26 words
A terpolymer according to claim 1 wherein said terpolymer possesses enhanced drag reduction efficiency in acid, base, or salt solutions as compared to homogeneously charged copolymers.
Claim 11
Dependent Claim
19 words
A terpolymer according to claim 1 wherein said terpolymer is derived from water soluble nonionic, anionic and cationic monomers.
Claim 12
Dependent Claim
26 words
The use of terpolymers of claim 1 as drag reducing agents employed in aqueous salt solutions at polymer levels from about 20 to about 1000 ppm.
Claim 13
Dependent Claim
36 words
The use of terpolymers of claim 1 as drag reducing agents employed in multicomponent salt solutions, e.g., well control and workover fluids, blood and the like, at polymer levels from about 20 to about 1000 ppm.
References Cited (Backward Citations)
US3123589A
Cited
US4075183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |