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Core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere and preparation method thereof

A polyacrylamide and acrylamide technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of high relative molecular mass of products, poor stability of product emulsions, low product purity, etc., and it is easy to achieve the conditions of the preparation process. Control, excellent injectability and flowability, green effect of the preparation process

Inactive Publication Date: 2014-04-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inverse emulsion polymerization method has a fast polymerization rate, a high relative molecular weight of the product, and a narrow molecular weight distribution. The product can be directly applied or made into a powder, and is easy to dissolve. The disadvantage is that it is less stable than the conventional emulsion, and the latex particles are easy to coagulate.
Precipitation polymerization for water-soluble monomers is difficult to prepare microspheres with monodispersity and smooth surface morphology due to solvation and the high surface energy of the molecule itself
Inverse suspension polymerization is a method of suspending acrylamide aqueous solution in the form of small droplets in an organic solvent for polymerization, but its disadvantages are that the product purity is not high, the stability of the product emulsion is poor, and the process is relatively complicated. If the emulsifiers and hydrocarbon solvents are used directly, the polymer will cause secondary pollution; if it is made into polymer powder after a certain process, it will not only take a lot of work, but also pollute the atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0036] Weigh successively 50g (33.3%) of acrylamide, 10g (6.7%) of acryloxyethyltrimethylammonium chloride, 0.06g (0.1%) of pentaerythritol triacrylate, 0.14g (0.1%) of Tween 60 surfactant ), add propanol to 140g, stir well until the monomer is completely dissolved to obtain solution A; weigh 0.06g (0.1%) of azobisisobutyronitrile, add propanol to 10g, and stir until completely dissolved to obtain solution B ;

[0037] Add 1 / 3 of solution A and solution B into the four-necked flask respectively, control the speed at 200r / min, pass N 2 Exhaust oxygen for 0.5h, heat up to 50°C and react for 3h, white insoluble matter precipitates; then mix the remaining A and B solutions evenly and add to the reaction system, control 50°C, speed 200r / min, N 2 After reacting for 3 hours under environmental protection conditions, the white insoluble solid gradually increased, and a white turbid microsphere core system was obtained.

[0038] Take by weighing acrylamide 10g (33.3%), sodium acrylate ...

Embodiment example 2

[0041] Weigh successively 30g (15%) of acrylamide, 2g (1%) of dimethyldiallyl ammonium chloride, 0.325g (1%) of dimethyldiallyl ammonium chloride, dodecylbenzenesulfonate Add 2g (1%) of sodium nitrate, add cyclohexane to 180g, fully stir until the monomer is completely dissolved to obtain solution A; weigh 0.32g (1%) of azobisisobutyronitrile, add cyclohexane to 20g, fully Stir until completely dissolved to obtain solution B;

[0042] Add 1 / 3 of solution A and solution B into the four-necked flask respectively, control the rotation speed at 300r / min, pass N 2 Exhaust oxygen for 0.5h, heat up to 60°C and react for 3h, white insoluble matter precipitates out; then mix the remaining A and B solutions evenly and add to the reaction system, control 60°C, speed 300r / min, N 2 After reacting for 3 hours under environmental protection conditions, the white insoluble solid gradually increased, and a white turbid microsphere core system was obtained.

[0043] Weigh 7.5g (15%) of acryla...

Embodiment example 3

[0046] Weigh successively 3g (8.8%) of acrylamide, 10.2g (30%) of β-aminoethyl methacrylate sulfate, 1.056g (8%) of polyethylene glycol diacrylate, and 2g of Span 80 surfactant (5.9%), add benzene to 30g, fully stir until the monomer is completely dissolved to obtain solution A; weigh 0.041 (0.3%) g of potassium persulfate, add benzene to 4g, fully stir until completely dissolved to obtain solution B;

[0047] Add 1 / 3 of solution A and solution B into the four-necked flask respectively, control the rotation speed at 400r / min, pass N 2 Exhaust oxygen for 0.5h, heat up to 40°C and react for 3h, white insoluble matter precipitates; then mix the remaining A and B solutions evenly and add to the reaction system, control 40°C, speed 400r / min, N 2 After reacting for 3 hours under environmental protection conditions, the white insoluble solid gradually increased, and a white turbid microsphere core system was obtained.

[0048] Weigh 75g (50%) of acrylamide, 45g (30%) of β-allylsulfo...

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Abstract

The invention discloses a core-shell type cationic / anionic polyacrylamide profile control oil displacing microsphere and a preparation method thereof. The core-shell type cationic / anionic polyacrylamide profile control oil displacing microsphere with a micrometer particle size range is prepared in one pot by adopting a dispersion polymerization method, and the whole preparation process is continuously completed by two steps: firstly synthesizing a core part of a microsphere, and then synthesizing a shell part of the microsphere. The core part of the microsphere consists of water-soluble monomer acrylamide, an ionic monomer I and a crosslinking agent; the shell part of the microsphere consists of water-soluble monomer acrylamide, an ionic monomer II and a crosslinking agent; and the ionic monomer I and the ionic monomer II have opposite charges. The particle size of the core-shell type cationic / anionic polyacrylamide profile control oil displacing microsphere is 1-200mu m. The preparation method is simple in preparation process, the whole preparation process is environmentally friendly and low in cost; and a solvent can be recycled, and the recycling rate is above 80 percent. The core-shell type cationic / anionic polyacrylamide profile control oil displacing microsphere is used as a profile control oil displacing material, and has excellent injectivity and mobility.

Description

technical field [0001] The invention discloses a preparation method of a novel core-shell cationic / anionic polyacrylamide microsphere. Background technique [0002] With the continuous deepening of my country's oil exploitation, major oil fields have entered high water cut period one after another. As an important means of secondary and tertiary oil recovery, profile control and water shutoff technology has been widely used in various oil fields. For profile control and water shutoff, deep profile control and flooding technology is a technology that maximizes secondary oil recovery while performing limited tertiary oil recovery. The traditional inorganic profile control agent is easy to precipitate and cannot enter the deep formation for plugging, the movable weak gel has poor cross-linking controllability, high cost, and the water-swellable polymer gel particles are large, so there is a contradiction between injection depth and plugging strength , the failure is faster; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/06C08F226/02C08F212/14C08F228/02C08F220/58C08F2/26C08F2/30C09K8/588
Inventor 刘晓非吴晓乐李俊霖李景龙金鑫
Owner TIANJIN UNIV
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