Temperature-resistant salt-resistant viscoelastic polymer gel microsphere, profile control and flooding agent, and preparation methods and applications thereof

A technology of gel microspheres and water-soluble polymers, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of insufficient blocking ability, high salinity microsphere expansion performance, and limited pore blocking ability And other issues

Active Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that in the prior art, polymer microspheres with initial particle diameters of nanoscale and submicron scales prepared by inverse microemulsion or inverse emulsion polymerization are suitable for the pores of medium and high permeability formations. The plugging capacity is limited. If the salinity of the formation water is high and the expansion performance of the microspheres is limited, the plugging capacity will be even more insufficient. Even if the injection concentration is increased, the plugging of medium and high permeability and fractures will only be enhanced. The viscosity of the microsphere system is close to that of water, so it has almost no effect on oil-bearing low-permeability layers, so it generally only plays a role in profile control for medium-high permeability reservoirs, and it is difficult to control the mobility of low-permeability reservoirs To solve the problem, a new type of temperature-resistant and salt-resistant viscoelastic polymer gel microspheres is provided. In the process of preparation or injection, the substance dissolves quickly in water to produce a certain viscosity, which can play a good role in fluidity control, and can reach the enriched area of ​​residual oil to displace oil, achieving the effect of integrated control and flooding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First add 960g of 5# white oil, 240g of SPAN60, and 80g of TWEEN60 into the reaction kettle, stir until completely mixed and uniform as the oil phase, control the temperature in the kettle to 20°C, and the stirring speed to 360rpm. Add 280g of water, 400g of acrylamide, 40g of acryloyloxyethyltrimethylammonium chloride, 13g of sodium acetate, 0.3g of disodium edetate, 10g of isopropanol, and 1.5 g of methylenebisacrylamide into the container. g, stir and dissolve evenly as the water phase I, take another container, add 250g water, 300g acrylamide, 80g 2-acrylamido-2-methylpropanesulfonate sodium, 2-acrylamidotetradecyl sodium sulfonate 4g , 12 g of sodium acetate, 0.3 g of disodium edetate, and 10.0 g of isopropanol were stirred and dissolved evenly as the water phase II; 0.32 g of ammonium persulfate and 0.25 g of sodium bisulfite were dissolved in 10 g of water for later use. Add the water phase I into the oil phase in the reactor, stir until the emulsification is uni...

Embodiment 2

[0040]First add 1000g cyclohexane, 240g SPAN80, 70g TWEEN80 into the reaction kettle, stir until completely mixed, as the oil phase I, control the temperature in the kettle to 22°C, and the stirring speed to 360rpm; 2 g of azobisisobutyronitrile was dissolved in 29 g of ethyl acetate as oil phase II. The temperature in the kettle was controlled to be 20° C., and the stirring speed was 360 rpm. Add 300g of water, 350g of acrylamide, 20g of tert-butylacrylamide, 15g of sodium acetate, 0.4g of disodium ethylenediaminetetraacetate, 13g of isopropanol, and 1.4g of methylenebisacrylamide into the container, stir and dissolve evenly as Water phase I, take another container, add 300g water, 300g acrylamide, 100g sodium 2-acrylamido-2-methylpropanesulfonate, 15g sodium acetate, 0.4g disodium edetate, 12.0 isopropanol g, stirred and dissolved evenly as the water phase II; 0.35 g of ammonium persulfate and 0.28 g of sodium bisulfite were dissolved in 10 g of water for later use. Add th...

Embodiment 3

[0043] First add 1000g of liquid paraffin and 300g of AEO-3 into the reaction kettle, stir until completely mixed evenly, as oil phase I, control the temperature in the kettle to 25°C, and the stirring speed to 360rpm; in addition, add 5g of stearyl methacrylate and 5g of Azodiisovaleronitrile was dissolved in 25 g of ethyl acetate as oil phase II. Add 300g of water, 300g of acrylamide, 40g of N-vinylpyrrolidone, 30g of methacryloxyethyltrimethylammonium chloride, 23g of sodium acetate, 0.5g of disodium edetate, and 14g of n-hexanol into the container , 1.8g of methylenebisacrylamide, stir and dissolve evenly as the water phase I, take another container, add 300g of water, 300g of acrylamide, 120g of sodium 2-acrylamido-2-methylpropanesulfonate, and 14g of sodium acetate, Disodium edetate 0.6g, n-hexanol 14g, polyethylene glycol diacrylate 1.8g, stir and dissolve evenly as water phase II; dissolve 0.8g ammonium persulfate and 0.6g sodium bisulfite in 10g water for later use ....

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PUM

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Abstract

The invention relates to a temperature-resistant and salt-resistant viscoelastic polymer gel microsphere and a profile control and flooding agent as well as preparation methods and applications thereof, and mainly solves the problems that in the prior art, polymer microspheres generally only have a profile control effect on medium-high permeability oil reservoirs, and have difficulty in controlling the fluidity of low-permeability oil reservoirs. According to the technical scheme, the polymer gel microsphere is adopted; the polymer gel microsphere comprises a gel microsphere and a polymer coated on the microsphere, wherein the gel microsphere is a crosslinked polymer containing an acrylamide structural unit; and the polymer is a water-soluble polymer containing an acrylamide structural unit. The problem is well solved, and the prepared temperature-resistant salt-resistant viscoelastic polymer gel microsphere profile control and flooding system is directly used or compounded with otheroilfield chemicals, and then is used for onsite application such as deep profile control, flooding and the like for tertiary oil recovery of high-temperature and high-salinity oil reservoirs to increase the recovery ratio.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant viscoelastic polymer gel microsphere, a control and displacement agent, a preparation method and application thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. The purpose of tertiary oil recovery is to enhance oil recovery. The oil recovery factor is equal to the sweep factor multiplied by the oil washing efficiency. To enhance the oil recovery rate through the tertiary oil recovery method is to increase the sweep factor and (or) the oil washing efficiency of the oil displacement agent. Polymer flooding is the main technical method of tertiary oil recovery. The injected polymer solution has high viscosity, high residual resistance coefficient and viscoelastic effect after passing through the oil lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F222/38C08F220/58C08F220/54C08F220/18C08F226/10C08F220/06C08F226/02C08F222/20C09K8/512C09K8/588
CPCC08F220/56C09K8/5083C09K8/512C09K8/588
Inventor 夏燕敏苏智青李应成许汇王兰
Owner CHINA PETROLEUM & CHEM CORP
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