Polyacrylamide reversed-phase microemulsion and preparation method thereof

A technology of inverse microemulsion and polyacrylamide, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor stability of polyacrylamide microemulsion and low content of precipitated solids, and achieve Uniform particle size and distribution, stable control, good expansion performance and plugging performance

Active Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is the problem that the polyacrylamide microemulsion in the prior art has poor stability and the content of precipitated solids is low. A new type of polyacrylamide microemulsion is provided. High performance, no delamination after being placed for more than three months; high solid content, the proportion in the system is greater than 25%, which can meet the field application of deep profile control, water plugging, oil flooding, etc. for oilfield tertiary oil recovery, and has good economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First add 1200g of white oil, 300g of SPAN60, and 130g of TWEEN60 into the reaction kettle, stir until completely mixed and uniform, control the temperature in the kettle to 28°C, and the stirring speed to 200rpm. In another container, add 670g of water, 750g of acrylamide, 300g of sodium 2-acrylamido-2-methylpropanesulfonate, 40g of sodium acetate, 0.8g of disodium edetate, 2.5g of isopropanol, and 12g of urea , ammonium persulfate 3.2g, methylenebisacrylamide 2.5g, stir and dissolve evenly as the water phase; dissolve 2.5g sodium bisulfite in 20g water for later use. Add 700g of the water phase to the oil phase in the reactor, stir for a few minutes until emulsified evenly, drop in 8.2g of reducing agent aqueous solution, the temperature rises to 65°C quickly, keep it warm for 1.5 hours, then drop to 28°C; add 600g again Mix the water phase evenly, add 7.5g of reducing agent aqueous solution dropwise, raise the temperature to 58°C, keep it warm for 1.5 hours, then dro...

Embodiment 2

[0047] First add 1200g of cyclohexane, 280g of SPAN80, and 120g of TWEEN80 into the reaction kettle, stir until completely mixed and uniform, control the temperature in the kettle to 30°C, and the stirring speed to 200rpm. In another container, add 670g of water, 700g of acrylamide, 250g of sodium 2-acrylamido-2-methylpropanesulfonate, 50g of N-N-dimethylacrylamide, 35g of sodium acetate, and 0.8 g of disodium edetate g, isopropanol 2.5g, urea 10g, ammonium persulfate 3.5g, methylene bisacrylamide 2.5g, stir and dissolve evenly as the water phase; dissolve 3.1g sodium bisulfite in 20g water for later use. Add 680g of the water phase to the oil phase in the reactor, stir for a few minutes until emulsified evenly, drop in 9.0g of reducing agent aqueous solution, the temperature rises to 58°C quickly, keep it warm for 1.5 hours, then drop to 30°C; add 600g again Mix the water phase evenly, drop in 7.8g of reducing agent aqueous solution, raise the temperature to 54°C, keep it war...

Embodiment 3

[0050] First add 1200g of liquid paraffin and 380g of AEO-3 into the reaction kettle, stir until completely mixed and uniform, control the temperature in the kettle to 25°C, and the stirring speed to 200rpm. In another container, add 670g of water, 700g of acrylamide, 250g of sodium 2-acrylamido-2-methylpropanesulfonate, 80g of N-vinylpyrrolidone, 45g of sodium acetate, 1.2g of disodium edetate, n-hexanol 2.8g, 12g of urea, 3.8g of ammonium persulfate, 2.8g of polyethylene glycol diacrylate, stir and dissolve evenly as the water phase; dissolve 3.3g of sodium bisulfite in 20g of water for later use. Add 710g of the water phase to the oil phase in the reactor, stir for a few minutes until emulsification is uniform, drop in 9.5g of reducing agent aqueous solution, the temperature rises to 68°C quickly, keep it warm for 1.5 hours, and then drop to 25°C; add 610g again Mix the water phase evenly, drop in 7.6g of reducing agent aqueous solution, raise the temperature to 62°C, keep ...

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Abstract

The invention relates to polyacrylamide reversed-phase microemulsion and a preparation method thereof. The polyacrylamide reversed-phase microemulsion is mainly used for solving the problem that product solid content is low and emulsion is unstable in the prior art. A semicontinuous polymerization method is adopted to add an aqueous phase containing monomers such as acrylamide into an oil phase containing an emulsifier, so that polymerization process control of the microemulsion is relatively stable, the microemulsion stability is good, and the content of solids capable of being separated out is high. By adopting a technical scheme that the polyacrylamide reversed-phase microemulsion comprises the following components in parts by weight: 20-70 parts of an oil-soluble solvent, 5-20 parts of an emulsifier and a co-emulsifier and 20-70 parts of an aqueous phase containing acrylamide polymer, the problem is solved well; the prepared polyacrylamide reversed-phase microemulsion is directly used or compounded with other oil-field chemicals so as to use for field application such as deep profile control, water shutoff and displacement of reservoir oil, which can be used for increasing recovery efficiency, for oil-field tertiary oil recovery.

Description

technical field [0001] The invention relates to a polyacrylamide inverse microemulsion and a preparation method thereof. Background technique [0002] Microemulsion (microemulsion) is a kind of isotropic, clear transparent or translucent, particle size between 8-100nm, thermodynamically stable colloidal dispersion system. The concept of microemulsion was proposed by Schulmann in the 1940s. It has the characteristics of small particles, uniform size, and high stability. The fundamental difference between microemulsions and ordinary emulsions is that microemulsions are thermodynamically stable systems, so microemulsions have high stability and can also be automatically emulsified, and will not delaminate and break after long-term storage. Another feature of microemulsions is low viscosity. . Although its properties are very different from ordinary emulsions, there are still many similarities. For example, microemulsions also have O / W type and W / O type. Emulsifiers that are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/06C08F220/54C08F226/10C08F220/34C08F2/30C08F4/40C09K8/588
Inventor 夏燕敏宋晓芳苏智青于志省许汇
Owner CHINA PETROLEUM & CHEM CORP
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