CN-122011274-A - Emulsified viscoelastic high molecular polymer, and preparation method and application thereof

Abstract

The invention discloses an emulsified viscoelastic high molecular polymer, which has the molecular formula: wherein in the formula (1), R is In the formula (2), R 1 is One of R 2 is One of them. The invention also discloses the preparation and application of the composition. The emulsified viscoelastic high molecular polymer provided by the invention has strong tackifying property which is 2-3 times that of common anionic partially hydrolyzed polyacrylamide, strong fluidity control capability, capability of emulsifying crude oil, strong emulsifying stability, strong viscoelasticity, high oil displacement efficiency, large recovery ratio improvement range and 15-20 percent higher than water flooding recovery ratio.

Inventors

• CUI DANDAN
• ZHANG NAN
• WANG WEI
• SUN CHEN
• YAN XI
• WU XING
• ZHAO FENGXIANG
• ZHANG SHAOZHE
• LIANG YANBIN
• HUANG TAO

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (10)

1. 1. An emulsified viscoelastic high molecular polymer, wherein the polymer has a molecular formula of: wherein in the formula (1), R is In the formula (2), R 1 is In one of the above-mentioned processes, R 2 is One of them.
2. 2. A method of preparing the emulsified viscoelastic high molecular polymer of claim 1, the method comprising: (1) Preparing 15-30 parts of distilled water, 4-7 parts of acrylamide and 1-5 parts of 2-acrylamido-2-methylpropanesulfonic acid into an aqueous solution, and regulating the pH value to 5-7 to obtain a reaction solution; (2) Adding 1-2 parts of dispersing agent, 1-3 parts of surface active monomer and 1-2 parts of polycyclic aromatic hydrocarbon into the reaction solution, stirring and introducing inert gas to deoxidize for 30-40min; (3) Heating to 55-65 ℃, adding 0.5-1 part of initiator, and reacting for 15-25 hours to obtain the emulsified viscoelastic high polymer.
3. 3. The method of claim 2, wherein the dispersant is one or any combination of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, and sodium dodecyl sulfate.
4. 4. The method of claim 2, wherein the surface active monomer is one or any combination of N-vinyl-2-pyrrolidone, cetyl dimethylallyl ammonium chloride, butylstyrene, and sodium 3-acrylamido-3-methylbutanoate.
5. 5. The method of claim 2, wherein the polycyclic aromatic hydrocarbon is one or any combination of styrene, 4-vinylbiphenyl, 4-vinyloctylphenol polyoxyethylene (10) ether, and 4-vinyloctylphenol polyoxyethylene (20) ether.
6. 6. The method of claim 2, wherein the initiator is one or any combination of potassium persulfate, sodium persulfate, ammonium persulfate, sodium bisulfite, and anhydrous sodium carbonate.
7. 7. The method of claim 2, wherein step (1) uses NaOH to adjust the pH.
8. 8. The method of claim 2, wherein the inert gas of step (2) is nitrogen.
9. 9. An oil displacing system comprising the emulsified viscoelastic high molecular polymer as set forth in claim 1.
10. 10. Use of the flooding system of claim 9 in oil and gas field development.

Description

Emulsified viscoelastic high molecular polymer, and preparation method and application thereof Technical Field The invention relates to an emulsified viscoelastic high molecular polymer, a preparation method and application thereof. Background With the vigorous development of economy, petroleum is greatly valued as a non-renewable resource, and the chemical flooding recovery improvement technology has become an important means for greatly improving the recovery in the medium and Gao Shenyou fields, has wide application prospect, and is ballast stone for stable production of old oil fields. The tertiary oil recovery poly/surface binary flooding and ternary composite flooding are main chemical flooding technologies for improving the recovery ratio of crude oil of medium-high permeability reservoirs, and many oil fields have been successfully applied. The polymer/surface binary flooding and ternary composite flooding technologies not only can increase viscosity and expand swept volume, but also can emulsify and reduce interfacial tension to improve oil displacement efficiency, so that the application effect is better than that of a single polymer flooding technology, but the problems of synergistic action exertion, chromatographic separation effect, adsorption and the like among multiple chemical agents are not solved effectively. Disclosure of Invention In view of the above problems, an oil displacement system with dual effects of expanding the swept volume and improving the oil displacement efficiency needs to be developed, and the invention provides an emulsified viscoelastic high polymer and a preparation method thereof. As one aspect of the present invention, an emulsified viscoelastic high molecular polymer is provided, the polymer having the formula: wherein in the formula (1), R is In the formula (2), R 1 isIn one of the above-mentioned processes, R 2 isOne of them. As another aspect of the present invention, there is provided a method for producing the above emulsified viscoelastic high molecular polymer, the method comprising: (1) Preparing 15-30 parts of distilled water, 4-7 parts of acrylamide and 1-5 parts of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) into an aqueous solution, and regulating the pH value to 5-7 to obtain a reaction solution; (2) Adding 1-2 parts of dispersing agent, 1-3 parts of surface active monomer and 1-2 parts of polycyclic aromatic hydrocarbon into the reaction solution, stirring and introducing inert gas to deoxidize for 30-40min; (3) Heating to 55-65 ℃, adding 0.5-1 part of initiator, and reacting for 15-25 hours to obtain the emulsified viscoelastic high polymer. In a specific embodiment, the dispersant is one or any combination of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate. In specific embodiments, the surface active monomer is one or any combination of N-vinyl-2-pyrrolidone, cetyl dimethylallyl ammonium chloride, butylstyrene, and sodium 3-acrylamido-3-methylbutanoate. In a specific embodiment, the polycyclic aromatic hydrocarbon is one of styrene, 4-vinyl biphenyl, 4-vinyl octylphenol polyoxyethylene (10) ether and 4-vinyl octylphenol polyoxyethylene (20) ether or any combination thereof. In a specific embodiment, the initiator is one of potassium persulfate, sodium persulfate, ammonium persulfate, sodium bisulfite, anhydrous sodium carbonate, or any combination thereof. In a specific embodiment, the aqueous solution of step (1) is pH adjusted using NaOH. In a specific embodiment, the inert gas in step (1) is nitrogen. As a further aspect, the present invention relates to a flooding system comprising the emulsified viscoelastic high molecular polymer described above. As a further aspect of the invention, it relates to the use of the above-described flooding system in oil and gas field development. The emulsified viscoelastic high molecular polymer provided by the invention has at least the following effects and advantages: (1) The emulsified viscoelastic high molecular polymer provided by the invention has strong tackifying property which is 2-3 times that of common anionic partially hydrolyzed polyacrylamide, and has strong fluidity control capability; (2) The emulsified viscoelastic high molecular polymer provided by the invention can emulsify crude oil, and has strong emulsion stability; (3) The emulsion viscoelastic high molecular polymer provided by the invention has strong viscoelasticity and high oil displacement efficiency; (4) The emulsified viscoelastic high molecular polymer provided by the invention has large recovery ratio, and is 15-20 percent higher than water flooding recovery ratio. Detailed Description In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It will be apparent that the described embodiments are some, but not al