Profile controlling and flooding composition for high-temperature oil reservoirs with high salinity
A high-temperature, high-salt, composition technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of low oil displacement efficiency, poor temperature and salt resistance, etc.
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Embodiment 1
[0054] The polymer microemulsion of the present embodiment is prepared by polymerizing a reverse phase microemulsion under the action of a redox composite initiator; the reverse phase microemulsion comprises the following components in parts by weight:
[0055] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;
[0056] b) 15 parts of emulsifier; the HLB value of the emulsifier is 6.7 (from Span 80 (that is, sorbitan monooleate) HLB value is 4.3; Tween 20 (polyoxyethylene (20EO) sorbitan monolauryl Ester) mixed with HLB value 16.7);
[0057] c) 30 parts of water-soluble monomer A; water-soluble monomer A is composed of 18 parts of acrylamide, 6 parts of sodium acrylate and 6 parts of 2-acrylamido-2-methylpropanesulfonate sodium;
[0058] d) 6 parts of temperature-resistant and salt-resistant monomers; the temperature-resistant and salt-resistant monomers are selected from oil-soluble temperature-resistant and salt-resistant monomers: octadecyl methacrylate;...
Embodiment 2
[0122] The polymer microemulsion of the present embodiment is prepared by polymerizing a reverse phase microemulsion under the action of a redox composite initiator; the reverse phase microemulsion comprises the following components in parts by weight:
[0123] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;
[0124] b) 15 parts of emulsifier; the emulsifier HLB is 6.7 Span 40;
[0125] c) 30 parts of water-soluble monomer A; water-soluble monomer A is composed of 18 parts of acrylamide, 6 parts of sodium acrylate and 6 parts of 2-acrylamido-2-methylpropanesulfonate sodium;
[0126] d) 6 parts of temperature-resistant and salt-resistant monomers; the temperature-resistant and salt-resistant monomers are selected from oil-soluble temperature-resistant and salt-resistant monomers: octadecyl methacrylate;
[0127] e) 24 parts of water;
[0128] Wherein, the composite initiator, in terms of the above-mentioned total monomer weight percent, comprises the fol...
Embodiment 3
[0145] The polymer microemulsion of the present embodiment is prepared by polymerizing a reverse phase microemulsion under the action of a redox composite initiator; the reverse phase microemulsion comprises the following components in parts by weight:
[0146] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;
[0147] b) 15 parts of emulsifier; the HLB value of the emulsifier is 6.7 (from Span 80 (that is, sorbitan monooleate) HLB value is 4.3; Tween 20 (polyoxyethylene (20EO) sorbitan monolauryl Ester) mixed with HLB value 16.7);
[0148] c) 30 parts of water-soluble monomer A; water-soluble monomer A is composed of 18 parts of acrylamide, 6 parts of sodium acrylate and 6 parts of 2-acrylamido-2-methylpropanesulfonate sodium;
[0149] d) 6 parts of temperature-resistant and salt-resistant monomers; the temperature-resistant and salt-resistant monomers are selected from oil-soluble temperature-resistant and salt-resistant monomers: octadecyl methacrylate;...
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