Gellable aqueous compositions containing polymers with special chelating functional groups useful for recovering oil from an oil field
First Claim
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1. An aqueous gellable composition comprising:
- (a) water;
(b) a water-soluble organic polymer crosslinkable by means of a multi-valent ion, consisting of acrylamide units and units bearing chelating functional groups, and, optionally units which are copolymerizable with acrylamide, said units bearing chelating functional groups represented by the formula ##STR21## in which R is H or CH3 ;
X is phenylene, --(CH2)n -- where n is within the range of 1 to 4, ##STR22## Y is selected from the group consisting of ##STR23## in which M is H, an alkali metal or NH4 ;
Z is OH or COOM, and the substituents on the benzene ring are in the ortho position to each other, wherein said polymer has a weight average molecular weight of from 200,000 to 20,000,000 and wherein said units of formula (I) are present in an amount within the range of from 0,7 to 20 mol percent with respect to the acrylamide units;
(c) a multi-valent ion capable of causing the polymer to crosslink selected from the group consisting of Cr3+, Al3+, Ti4+, Zr4+, Sn4+, Zn2+, Y3+ and B3+ ;
wherein the concentration of (b) in (a) is within the range of from 1000 to 50,000 ppm, the concentration of (c) in (a) is within the range of from 10 to 5000 ppm and the weight ratio of (b) to (c) is within the range of from 1;
1 to 1000;
1.
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Abstract
Gellable compositions containing:
(a) water;
(b) a water-soluble organic polymer bearing special chelating functional groups;
(c) a multi-valent metal ion capable of causing the polymer to crosslink,
are useful to recover oil from a oil field.
Said compositions make it possible gels to be obtained which are endowed with improved physical properties and show a higher stability under the conditions prevailing in the oil field.
40 Citations
17 Claims
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1. An aqueous gellable composition comprising:
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(a) water; (b) a water-soluble organic polymer crosslinkable by means of a multi-valent ion, consisting of acrylamide units and units bearing chelating functional groups, and, optionally units which are copolymerizable with acrylamide, said units bearing chelating functional groups represented by the formula ##STR21## in which R is H or CH3 ; X is phenylene, --(CH2)n -- where n is within the range of 1 to 4, ##STR22## Y is selected from the group consisting of ##STR23## in which M is H, an alkali metal or NH4 ;
Z is OH or COOM, and the substituents on the benzene ring are in the ortho position to each other, wherein said polymer has a weight average molecular weight of from 200,000 to 20,000,000 and wherein said units of formula (I) are present in an amount within the range of from 0,7 to 20 mol percent with respect to the acrylamide units;(c) a multi-valent ion capable of causing the polymer to crosslink selected from the group consisting of Cr3+, Al3+, Ti4+, Zr4+, Sn4+, Zn2+, Y3+ and B3+ ; wherein the concentration of (b) in (a) is within the range of from 1000 to 50,000 ppm, the concentration of (c) in (a) is within the range of from 10 to 5000 ppm and the weight ratio of (b) to (c) is within the range of from 1;
1 to 1000;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification