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Harsh oil deposit reversed-phase microemulsion profile-control flooding system and preparation method thereof

An inverse microemulsion and microemulsion technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor expansion performance of polymer microspheres, inappropriate initial particle size, etc., and achieve particle size and distribution. Uniform, high content of precipitated solids, good expansion performance and plugging performance

Active Publication Date: 2015-03-25
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 that the initial particle size of polyacrylamide microemulsion products in the prior art is not suitable and the expansion performance of polymer microspheres is poor under high temperature and high salt conditions. A new type of polyacrylamide microemulsion is provided Acrylamide microemulsion, the product has high stability and does not delaminate after being placed for more than three months; the present invention adds acrylamide and other temperature-resistant and salt-resistant comonomers in batches to the emulsifier-containing emulsifier by adopting a semi-continuous reaction method In the oil phase, the control of the polymerization process of the microemulsion is relatively stable, the stability of the microemulsion is good, and the content of solids that can be precipitated is high; and due to the addition of appropriate hydrophobic monomers, it can not only enhance the temperature resistance and salt resistance of the polymer, Moreover, the surface activity of the hydrophobic monomer itself contributes to the expansion of the monomer and the stability of the system. The product can meet the field application of depth profile control, water plugging, oil displacement, etc. for the tertiary oil recovery of harsh oil reservoirs, and Has good economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 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, 4g of sodium 2-acrylamidotetradecylsulfonate, 40g of sodium acetate, ethylenediaminetetraacetic acid Disodium 0.8g, isopropanol 2.5g, urea 12g, 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 t...

Embodiment 2

[0049] First add 1200g cyclohexane, 280g SPAN80, 120g TWEEN80 into the reaction kettle, stir until completely mixed, as the oil phase I, control the temperature in the kettle to 30°C, and the stirring speed to 200rpm; in addition, add 5g of N-phenylmaleimide and 6 g of azobisisobutyronitrile were dissolved in 29 g of ethyl acetate as oil phase II. In another container, add 670g of water, 750g of acrylamide, 300g of sodium 2-acrylamido-2-methylpropanesulfonate, 35g of sodium acetate, 0.8g of disodium edetate, 2.5g of isopropanol, and 10g of urea , ammonium persulfate 3.5g, methylenebisacrylamide 2.5g, stir and dissolve evenly as the water phase; dissolve 3.1g sodium bisulfite in 20g water for later use. Add 700g of water phase and 16g of oil phase II to the oil phase in the reaction kettle, stir for several minutes until emulsification is uniform, drop in 9.0g of reducing agent aqueous solution, the temperature rises to 58°C quickly, keep it warm for 1.5 hours, and then drop to...

Embodiment 3

[0052]First add 1200g of liquid paraffin and 380g of AEO-3 into the reaction kettle, stir until completely mixed, as the oil phase I, control the temperature in the kettle to 25°C, and the stirring speed to 200rpm; in addition, add 6g of stearyl methacrylate and 6g of Azodiisovaleronitrile was dissolved in 28 g of ethyl acetate as oil phase II. In another container, add 670g of water, 700g of acrylamide, 220g of sodium 2-acrylamido-2-methylpropanesulfonate, 80g of N-vinylpyrrolidone, 45g of sodium acetate, 1.2g of disodium edetate, and 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 700g of water phase and 16g of oil phase II to the oil phase in the reaction kettle, stir for several minutes until emulsification is uniform, drop in 9.5g of reducing agent aqueous solution, the temperature rises to 68°C quickly, keep i...

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Abstract

The invention relates to a harsh oil deposit reversed-phase microemulsion profile-control flooding system and a preparation method thereof. The problems in the prior art that the initial particle size of the product is improper and polymeric microspheres are poor in expansibility under high-temperature high-salt conditions are mainly solved. The harsh oil deposit reversed-phase microemulsion profile-control flooding system disclosed by the invention comprises the following components in parts by weight of microemulsion: 20-70 parts of an oil-soluble solvent, 5-20 parts of an emulsifier and a co-emulsifier, 20-70 parts of a polymer aqueous phase containing acrylamide and other temperature-resistant salt-resistant comonomers. According to the technical scheme, a semi-continuous reaction method is adopted, the aqueous phase containing acrylamide and other temperature-resistant salt-resistant comonomers is added into an oil phase containing the emulsifiers in batches, and a hydrophobic monomer is added, so that the problems are solved, the prepared polyacrylamide reversed-phase microemulsion is directly compounded or is compounded with other oil field chemicals to be applied to such field applications for improving oil recovery as depth profile control, water plugging and displacement in tertiary oil recovery of a harsh oil deposit.

Description

technical field [0001] The invention relates to a harsh oil reservoir reverse microemulsion control and flooding system 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 Schulman 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...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F222/38C08F222/40C08F220/18C08F226/10C08F222/14C08F212/12C08F220/06C08F220/34C08F212/36C08F4/40C08F4/04C08F2/30C09K8/588C09K8/512
Inventor 夏燕敏宋晓芳于志省苏智青许汇
Owner CHINA PETROLEUM & CHEM CORP
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