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A kind of hydrophobic association polymer and preparation method thereof

A hydrophobic association and polymer technology, applied in the field of polymers, can solve problems such as damage to the environment in the formation, intolerance to salt, performance degradation, etc.

Active Publication Date: 2019-01-04
新疆光亚油气新技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output and quality of natural polymers are limited by seasons and regions, and the performance stability cannot be guaranteed. Compared with synthetic polymers, they are used in large amounts and are easy to biodegrade. Higher residues will also seriously damage the environment in the formation, giving Later development brought many new problems
At present, the most widely used synthetic polymer is polyacrylamide. Although its performance in all aspects can meet the construction requirements, it is easy to cause mechanical degradation during the pumping process, and the viscosity of the solution drops rapidly. In high-temperature oil reservoir environment, polyacrylamide is not resistant to salt, and is easily degraded at high temperature, resulting in a significant decline in various properties, and it is difficult to further overcome it on the basis of its existing molecular structure. Therefore, from It is imminent to modify the polymer molecular structure to improve its shear resistance, temperature resistance and salt resistance

Method used

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  • A kind of hydrophobic association polymer and preparation method thereof
  • A kind of hydrophobic association polymer and preparation method thereof
  • A kind of hydrophobic association polymer and preparation method thereof

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preparation example Construction

[0035] The present invention also provides a method for preparing the above-mentioned hydrophobic association polymer. The method is to introduce sodium acrylate in the form of subsequent hydrolysis, including: under the action of an initiator, carry out a copolymerization reaction of an acrylamide monomer and a hydrophobic monomer, and hydrolyze Obtain hydrophobic association polymer afterwards; Described hydrophobic monomer is selected from N-alkyl substituted acrylamide and derivative thereof, alkyl acrylate and derivative thereof, alkyl methacrylate and derivative thereof, fluorine-substituted One or more of alkyl acrylate, fluorine-substituted methacrylate, allyl alkyl quaternary ammonium salt, acrylamide alkyl sulfonic acid and acrylamide alkyl sulfonate; said, allyl alkyl The number of carbon atoms of the alkyl group in the quaternary ammonium salt, acrylamide alkyl sulfonic acid and acrylamide alkyl sulfonate is greater than 20; the ratio of the number of moles of the h...

Embodiment 1

[0054] Embodiment 1 micelle polymerization polymerization

[0055] Add monomers and surfactants to a 5000mL beaker, wherein acrylamide and N-octylacrylamide are fed in a molar ratio of 99.7:0.3, sodium dodecylbenzenesulfonate is 12 times the molar concentration of hydrophobic monomers, Add quantitative pure water, stir fully and evenly to prepare a mixed solution with a total monomer mass concentration of 25%, lower the system to -5°C, add potassium persulfate and sodium bisulfite composite initiators to initiate polymerization, wherein potassium persulfate and sodium bisulfite The mass ratio of sodium bisulfite is 1:1, and the amount of potassium persulfate is 0.008% of the monomer mass. The polymerization reaction is carried out in an adiabatic environment. A thermometer is inserted in the center of the reaction system to monitor the progress of the polymerization reaction. When the temperature rises within 30 minutes Polymerization is considered substantially complete above...

Embodiment 2

[0060] Embodiment 2 inverse microemulsion polymerization is synthesized

[0061] Add sodium acrylate and acrylamide into deionized water, fully dissolve, and use this solution as the water phase; dissolve the oil-soluble monomer N,N-dioctylpropionamide in kerosene, and add the mass ratio of Span-80:Tween- 80=compound emulsifier composed of 7:3 and stirred until fully dissolved, as the oil phase. Under high-speed stirring, add the aqueous phase solution to the oil phase for 20 minutes to emulsify, transfer to a 5000mL beaker, in which the total mass concentration of monomers is 25%, acrylamide: sodium acrylate: N,N-dioctylpropionamide The molar ratio is 94.5:5:0.5, and the amount of compound emulsifier added is 15% of the total system mass. When the emulsion drops to -5°C, a composite initiator of potassium persulfate and sodium bisulfite is added to initiate polymerization, and the oxidant accounts for 0.01% of the mass of the monomer. Under adiabatic conditions, the reactio...

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Abstract

The present invention provides a hydrophobic association polymer, as shown in formula (I), said y=0.001~0.02, z=0.08~0.3, x+y+z=1; said A is a hydrophobic monomer A monomer unit; the viscosity-average molecular weight of the hydrophobic association polymer is 30 million to 45 million. Compared with the prior art, the hydrophobic association polymer of the present invention is composed of three kinds of units, the hydrophilic unit is the monomer unit of acrylamide, which can provide hydrophilic groups for the hydrophobic association; the hydrophobic unit is the hydrophobic unit The monomer unit of the body can provide hydrophobic side groups for the hydrophobic association polymer, and generate hydrophobic association between each hydrophobic side group in water to form a space network structure, thereby providing the necessary viscoelasticity for the solution; the monomer of sodium acrylate The unit can improve the solubility of the hydrophobic association polymer; the above three units interact to improve the salt resistance and shear resistance of the hydrophobic association polymer.

Description

technical field [0001] The invention belongs to the technical field of polymers, in particular to a hydrophobic association polymer and a preparation method thereof. Background technique [0002] In oilfield development and application technology, it is usually necessary to modify the formation environment, etc., and it is necessary to use certain performance fluids for mass transfer and transportation. By injecting these fluids into the formation, certain substances will be brought into the formation to act to transform the formation environment. To achieve the purpose of oil and gas field development and increase production. At the same time, related application technologies also require these fluids to have certain specific properties, such as thickening, viscoelasticity, drag reduction, permeability, and improved mobility ratio. Among them, the most commonly used fluid is aqueous solution, which has the advantages of wide source, economy, and convenient construction. By...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/18C08F220/22C08F220/54C08F220/58C08F226/02
CPCC08F220/56C08F220/06C08F220/1818C08F220/58
Inventor 郭拥军李华兵郭爱民蔡术威毛慧斐
Owner 新疆光亚油气新技术发展有限公司