Patent US4590996A successfully refreshed from Google Patents.
US4590996A
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Use of polyalkoxy sulfonate surfactants for inhibition of scale formation
Assignee: Mobil Oil AS
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Filing: 1984-12-13
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Granted: 1986-05-27
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Expires: 2004-12-13
Abstract
Abstract The accumulation of inorganic mineral scale such as barium sulfate in oil field formations and/or production equipment is inhibited by adding to formation fluid or produced fluid a scale formation inhibitory amount of a polyalkoxy sulfonate of the general formula (RO[R'O]x(CH2)ySO3)zM wherein R is a hydrophobe, R'O is a C2H4O or a C3H6O group or some combination thereof, M is a monovalent or divalet cation, x is 2 to 10, y is 0 to about 4 and z is 1 or 2.
Inventors
- 👤 Dennis H. Hoskin
- 👤 L. Deane Rollmann
- 👤 Gerald L. Shoemaker
- 👤 Kirk D. Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:46
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C09K23/00; C09K23/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A process for inhibiting deposition of mineral scale in oil field formations and/or production equipment which comprises combining formation fluid produced or fluid containing precipitable mineral salt with a precipitation-inhibiting amount of at least one polyalkoxy sulfonate compound of the general formula: (RO[R'O].sub.x (CH.sub.2).sub.y SO.sub.3).sub.z M wherein R is a hydrophobe, R'O is a C 2 H 4 O or a C 3 H 6 O group or some combination thereof, M is a monovalent or divalent cation, x is 2 to 10, y is 0 to about 4 and z is 1 or 2.
Claim 2
Dependent Claim
95 words
A process for inhibiting deposition of mineral scale in oil field formations and/or production equipment which comprises combining formation fluid produced or fluid containing precipitable mineral salt with a precipitation-inhibiting amount of at least one polyalkoxy sulfonate compound of the general formula: (RO[R'O].sub.x (CH.sub.2).sub.y SO.sub.3).sub.z M wherein R is a hydrophobe, R'O is a C 2 H 4 O or a C 3 H 6 O group or some combination thereof, M is a monovalent or divalent cation, x is 2 to 10, y is 0 to about 4 and z is 1 or 2.
Claim 3
Dependent Claim
56 words
The process of claim 1 wherein the inhibitor is a polyalkoxy sulfonate compound of the general formula: RO(CH.sub.2 CH.sub.2 O).sub.x CH.sub.2 CH.sub.2 CH.sub.2 SO.sub.3 Na in which R is a linear or branched alkyl group containing from 6 to about 20 carbon atoms or an alkylaromatic group containing from about 7 to about 21 carbon atoms.
Claim 4
Dependent Claim
24 words
The process of claim 2 in wherein R is a linear or branched alkyl group containing from about 8 to about 16 carbon atoms.
Claim 5
Dependent Claim
14 words
The process of claim 2 in wherein R is a nonylphenyl or octylphenyl group.
Claim 6
Dependent Claim
37 words
The process of claim 1 wherein the inhibitor is a polyalkoxy sulfonate compound of the general formula: ##STR11## in which each R" is the same or different and contains from about 4 to about 12 carbon atoms.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein M is a monovalent cation selected from the group consisting of lithium, sodium, potassium and ammonium.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein M is a divalent cation selected from the group consisting of calcium and magnesium.
Claim 9
Dependent Claim
42 words
The process of claim 1 wherein M is a quaternary ammonium of the structure ##STR12## in which each R"' is the same or different and is an alkyl group of from 1 to 3 carbon atoms or an aryl or alkaryl group.
Claim 10
Dependent Claim
25 words
The process of claim 1 wherein the inhibitor is an alkoxy sulfonate sodium salt selected from the group consisting of compounds of the structure: ##STR13##
Claim 11
Dependent Claim
30 words
The process of claim 1 wherein the produced fluid is combined with polyalkoxy sulfonate present in aqueous solution at a level of from about 0.001% to about 5.0% by weight.
Claim 12
Dependent Claim
30 words
The process of claim 1 wherein the produced fluid is combined with polyalkoxy sulfonate present in aqueous solution at a level of from about 0.1% to about 1.0% by weight.
Claim 13
Dependent Claim
36 words
The process of claim 1 wherein the polyalkoxy sulfonate is present in the produced fluid at a concentration of from about 1 to about 1,000 parts by weight per million parts by weight of produced fluid.
Claim 14
Dependent Claim
36 words
The process of claim 1 wherein the polyalkoxy sulfonate is present in the produced fluid at a concentration of from about 10 to about 200 parts by weight per million parts by weight of produced fluid.
References Cited (Backward Citations)
US3977471A
Cited
US4460481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |