Patent US4265673A successfully refreshed from Google Patents.
US4265673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer solutions for use in oil recovery containing a complexing agent for multivalentions
Assignee: Talres Development (N A) NV
•
Filing: 1979-06-20
•
Granted: 1981-05-05
•
Expires: 1999-06-20
Abstract
Abstract A process for preparing a polymer solution for use in "polymer based" oil recovery comprises adding to water the polymer in the form of an aqueous solution, a dry particulate solid or a suspension in a non-aqueous liquid, and also adding a complexing agent for multivalent ions and, where the solution so formed does not already contain an alkali metal salt, subsequently incorporating therein an alkali metal salt. The polymer may be a substantially cell-free microbial polysaccharide gum, a polyacrylamide or a cellulose derivative.
Inventors
- 👤 Gary W. Pace
- 👤 Trevor J. Holding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:49
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C12; C12P; C12P19/00; C12P19/04; C12P19/06; C08J2300/00; C08J2300/10; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936; Y10S524/00; Y10S524/917
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
62 words
A process for preparing a polymer solution for use in "polymer based" oil recovery, which comprises, in the absence of surfactant, combining water, a polymer selected from the group consisting of polyacrylamide and cellulose derivative and a complexing agent for multivalent ions and, where the solution so formed does not already contain an alkali metal salt, incorporating therein an alkali metal salt.
Claim 2
Dependent Claim
62 words
A process for preparing a polymer solution for use in "polymer based" oil recovery, which comprises, in the absence of surfactant, combining water, a polymer selected from the group consisting of polyacrylamide and cellulose derivative and a complexing agent for multivalent ions and, where the solution so formed does not already contain an alkali metal salt, incorporating therein an alkali metal salt.
Claim 3
Dependent Claim
28 words
A process according to claim 1, in which the polymer is selected from the group consisting of a substantially cell-free microbial polysaccharide gum, polyacrylamide and a cellulose derivative.
Claim 4
Dependent Claim
24 words
A process according to claim 2, in which the polymer is selected from the group consisting of xanthan gum, a β-1,3-glucan gum, and hydroxyethylcellulose.
Claim 5
Dependent Claim
49 words
A process according to claim 2, in which the polymer is a microbial polysaccharide in the form of an aqueous solution formed by cultivating a polysaccharide-producing strain of a microorganism in a nutrient medium and subjecting the broth so formed to treatment by a process to remove residual solids.
Claim 6
Dependent Claim
29 words
A process according to claim 2, in which the polymer is a microbial polysaccharide in the form of a particulate solid or a suspension also containing the complexing agent.
Claim 7
Dependent Claim
17 words
A process according to claim 4 or claim 5, in which the microbial polysaccharide is xanthan gum.
Claim 8
Dependent Claim
38 words
A process according to claim 1, in which the complexing agent is added to an aqueous solution of polymer before dilution with water, in an amount to provide the required concentration in the diluted solution for oil recovery.
Claim 9
Dependent Claim
30 words
A process according to claim 7, in which the complexing agent is added in an amount to provide a concentration of 0.01 to 2.0% by weight in the diluted solution.
Claim 10
Dependent Claim
24 words
A process according to claim 1 in which the complexing agent is sodium hexametaphosphate, ethylenediamine tetraacetic acid, or a salt of ethylenediamine tetraacetic acid.
Claim 11
Dependent Claim
18 words
A process according to claim 1, in which the alkali metal salt is sodium chloride or sodium sulphate.
Claim 12
Dependent Claim
44 words
A process for preparing a polymer solution for use in "polymer based" oil recovery, which comprises in absence of surfactant, combining, the polymer and a complexing agent for multivalent ions and then diluting the solution so formed with mixture of an alkali metal salt.
Claim 13
Dependent Claim
44 words
A process for preparing a polymer solution for use in "polymer based" oil recovery, which comprises in absence of surfactant, combining, the polymer and a complexing agent for multivalent ions and then diluting the solution so formed with mixture of an alkali metal salt.
Claim 14
Dependent Claim
18 words
A surfactant-free suspension of xanthan gum in a non-aqueous liquid together with a complexing agent for multivalent ions.
Claim 15
Dependent Claim
18 words
A surfactant-free suspension of xanthan gum in a non-aqueous liquid together with a complexing agent for multivalent ions.
Claim 16
Dependent Claim
22 words
A surfactant-free particulate solid comprising a combination of a polymer for use in oil recovery with a complexing agent for mutivalent ions.
Claim 17
Dependent Claim
22 words
A surfactant-free particulate solid comprising a combination of a polymer for use in oil recovery with a complexing agent for mutivalent ions.
Claim 18
Dependent Claim
25 words
A solid according to claim 12, in which the polymer is microbial polysaccharide, the solid combination having been co-precipitated from solution in a culture broth.
Claim 19
Dependent Claim
12 words
A solid according to claim 14, in which the polysaccharide is xanthan.
Claim 20
Dependent Claim
37 words
A process according to claim 1, in which the water, polymer and complexing agent are combined in the absence of the alkali metal salt and said alkali metal salt is subsequently incorporated into the solution so formed.
Claim 21
Dependent Claim
36 words
A process according to claim 1, or 11 in which said polymer and complexing agent are combined in dry form and the resulting dry combination is combined with an aqueous solution of said alkali metal salt.
Claim 22
Dependent Claim
13 words
A process according to claim 1 in which the polymer is hydroxyethyl cellulose.
References Cited (Backward Citations)
US3532166A
Cited
US3853771A
Cited
US4049054A
Cited
US4128482A
Cited
DE2734364A1
Cited
US4119546A
Cited
US4078607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |