US4610305A
Expired / Lapsed
US
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Oilfield flooding polymer
Assignee: New Mexico Institute of Mining and Technology
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Filing: 1984-09-19
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Granted: 1986-09-09
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Expires: 2004-09-19
Abstract
Abstract A monomer, polymers containing the monomer, and the use of the polymer in oilfield flooding is disclosed. The subject monomer is represented by the general formula: ##STR1## wherein: n is an integer from 0 to about 4; m is an integer from 0 to about 6; a is an integer equal to at least 1 except where m is equal to 0, a must equal 0 and where m is equal to 1, a must equal 0 or 1; p is an integer from 2 to about 10; b is an integer equal to at least 1 and is of sufficient magnitude that the ratio b/p is at least 0.2; and q is an integer from 0 to 2. The number of hydroxy groups in the monomer is believed to be critical, and therefore the sum of (a+b) divided by the sum (m+p) should be at least 0.2. The moieties linked to the acrylic nitrogen can be joined to provide a ringed structure.
Inventors
- 👤 Fred D. Martin
- 👤 Melvin J. Hatch
- 👤 Joel S. Shepitka
- 👤 Lorraine G. Donaruma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:33
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
In the process of recovering hydrocarbons from a subterranean formation by polymer flooding comprising injecting into said formation a viscous aqueous solution of polymer, the improvement comprising including in said solution an amount of water-soluble polymer effective to increase the viscosity thereof, said water-soluble polymer represented by the general structure: ##STR12## wherein: n' and n" are integers individually selected from the set of 0 to about 4; M + is a cation selected from the group consisting of hydrogen, sodium, ammonium, potassium, and mixtures thereof; and x, y, and z represent the mole percent of the subtended monomer present in said polymer and wherein: x is about 1 to about 99 percent; y is 0 to about 80 percent; and z is about 1 to about 50 percent.
Claim 2
Dependent Claim
128 words
In the process of recovering hydrocarbons from a subterranean formation by polymer flooding comprising injecting into said formation a viscous aqueous solution of polymer, the improvement comprising including in said solution an amount of water-soluble polymer effective to increase the viscosity thereof, said water-soluble polymer represented by the general structure: ##STR12## wherein: n' and n" are integers individually selected from the set of 0 to about 4; M + is a cation selected from the group consisting of hydrogen, sodium, ammonium, potassium, and mixtures thereof; and x, y, and z represent the mole percent of the subtended monomer present in said polymer and wherein: x is about 1 to about 99 percent; y is 0 to about 80 percent; and z is about 1 to about 50 percent.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein x is about 5 to 85 percent; y is about 10 to about 65 percent; and z is about 35 percent.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein x is about 30 to about 70 percent; y is about 50 percent; and z is about 10 to 20 percent.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein n is 0 to 1.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein n' and n" are individually selected from the group 0 and 1.
Claim 7
Dependent Claim
9 words
The process of claim 5 wherein n is 0.
Claim 8
Dependent Claim
30 words
The process of claim 1 wherein: x is about 30 to 70 percent; y is about 20 to about 30 percent and z is about 3 to about 30 percent.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein n' and n" are 0 and M + is a sodium cation.
Claim 10
Dependent Claim
61 words
In the process of recovering hydrocarbons from a subterranean formation by polymer flooding comprising injecting into said formation a viscous aqueous solution of polymer, the improvement comprising including in said solution an amount of water-soluble polymer effective to increase the viscosity thereof, said water-soluble polymer containing at least about one percent groups derived from monomers represented by the general structure: ##STR13##
Claim 11
Dependent Claim
61 words
In the process of recovering hydrocarbons from a subterranean formation by polymer flooding comprising injecting into said formation a viscous aqueous solution of polymer, the improvement comprising including in said solution an amount of water-soluble polymer effective to increase the viscosity thereof, said water-soluble polymer containing at least about one percent groups derived from monomers represented by the general structure: ##STR13##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |