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Polyacrylamide microsphere emulsion and preparation method thereof

A technology of polyacrylamide and microsphere emulsion, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor stability, low solid content of the product, high emulsifier dosage, etc., and achieve good space stability high stability, low emulsifier content, and good stability

Active Publication Date: 2020-08-07
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 the amount of emulsifier used in the existing polymer microsphere emulsion prepared by the inverse microemulsion method is high, and the solid content of the product prepared by the ordinary inverse emulsion method is low and the stability is not good. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 700g white oil, 40g SPAN80, 30g oligoethylene oxide methacrylate polymer emulsifier, 6g AEO9, composite emulsifier HLB=5.3 into a 3L large beaker, and stir the above oil phase until completely mixed; In another container, add 600g of water, 650g of acrylamide, 150g of sodium 2-acrylamido-2-methylpropanesulfonate, 20g of sodium acetate, 0.8g of disodium edetate, 5g of isopropanol, and 8g of urea , 2.5 g of methylenebisacrylamide, stirred and dissolved evenly as the water phase; in addition, 2% ammonium persulfate and 0.05% sodium bisulfite aqueous solutions were prepared respectively for later use. Turn on the emulsifier at 10,000 rpm, add all the water phase to the large beaker storing the oil phase, shear and stir for 30 minutes until the emulsification is uniform, then add the reaction emulsion into the polymerization kettle, control the temperature in the kettle to 12°C, and the stirring speed to 500rpm . After passing nitrogen for 30 minutes, first add 3 ml of ...

Embodiment 2

[0043] Add 680g white oil, 38g SPAN60, 32g styrene-maleic anhydride copolymer polymer emulsifier, 5g AEO9, composite emulsifier HLB=5.5 in 3L large beaker, stir the above-mentioned oil phase until completely mixed; Add 620g of water, 630g of acrylamide, 180g of 2-acrylamido-2-sodium methylpropanesulfonate, 110g of DMC (80%wt content), 22g of sodium acetate, 0.5g of disodium edetate in the container of 15g of isopropanol, 8g of urea, and 1.5g of methylenebisacrylamide were stirred and dissolved uniformly as the water phase; in addition, 2% ammonium persulfate and 0.06% aqueous sodium bisulfite were prepared separately for later use. Turn on the emulsifier at 10,000 rpm, add all the water phase to the large beaker storing the oil phase, shear and stir for 25 minutes until the emulsification is uniform, then add the reaction emulsion into the polymerization kettle, control the temperature in the kettle to 15°C, and the stirring speed to 500rpm . After passing nitrogen for 30 min...

Embodiment 3

[0046] Add 700g white oil, 40g SPAN83, 30g polyisobutylene succinic anhydride ester polymer emulsifier, 8g AEO15, composite emulsifier HLB=5.4 into a 3L large beaker, stir the above oil phase until completely mixed; in another container Add 400g of water, 700g of acrylamide, 100g of sodium 2-acrylamido-2-methylpropanesulfonate, 250g of DMC (80%wt content), 30g of sodium acetate, 0.5g of disodium edetate, isopropanol 20 g, 10 g of urea, and 2.0 g of methylenebisacrylamide were stirred and dissolved evenly as the water phase; in addition, 2% ammonium persulfate and 0.05% sodium bisulfite aqueous solutions were prepared separately for later use. Turn on the emulsifier at 10,000 rpm, add all the water phase to the large beaker storing the oil phase, shear and stir for 30 minutes until the emulsification is uniform, then add the reaction emulsion into the polymerization kettle, control the temperature in the kettle to 16°C, and the stirring speed to 500rpm . After passing nitrogen...

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Abstract

The invention relates to submicron polyacrylamide microsphere emulsion with high solid content and high stability as well as a preparation method thereof. The problems in the prior art that the use amount of an emulsifier in preparation of the polyacrylamide microsphere emulsion by a reversed-phase microemulsion method as well as the solid content is slightly low and the stability is low in preparation of a product by the common reversed-phase emulsion method are mainly solved. According to the technical scheme which adopts a composite emulsifier system and a composite initiator, the polyacrylamide microsphere emulsion is prepared by polymerizing: a) 10 to 40 parts by weight of an oil phase, b) 1 to 8 parts by weight of a composite emulsifier system, c) 50 to 80 parts by weight of an aqueous phase containing a polymerization monomer, wherein the content of the polymerization monomer in the aqueous phase is 40 to 70 percent, and d) 0.01 to 1.0 part of reversed-phase emulsion system suchas a crosslinking agent, so that the problems are solved well, and the polyacrylamide microsphere emulsion can be applied to field application capable of increasing recovery ratio, such as profile modification in depth, water plugging and oil displacement for tertiary oil recovery of medium-low permeability oil fields.

Description

technical field [0001] The invention relates to a polyacrylamide microsphere emulsion and a preparation method thereof, in particular to a submicron polyacrylamide microsphere emulsion with high solid content and good stability and a preparation method thereof. Background technique [0002] In recent decades, the influence of reservoir heterogeneity on the sweep coefficient of water flooding and chemical displacement fluid has become increasingly serious. Homogeneity, improve the volumetric sweep coefficient of injection fluid, thereby enhancing oil recovery. The theory of deep profile control and water shutoff mainly uses the plugging material to enter the deep part of the formation along with the displacement fluid to block the high-permeability water channel, causing the liquid flow to divert to expand the swept volume of water flooding. Polymer microsphere technology is a new type of deep profile control and water plugging technology developed in recent years. Its advan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F2/32C08F4/40C09K8/588
CPCC08F2/32C08F4/40C08F220/56C09K8/588C08F220/585
Inventor 夏燕敏许汇苏智青宋晓芳
Owner CHINA PETROLEUM & CHEM CORP
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