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A kind of electric double layer type polyacrylamide microsphere and preparation method thereof

A polyacrylamide and acrylamide technology, which is applied to chemical instruments and methods, drilling compositions and other directions, can solve the problems of limited water absorption and expansion ratio, environmental pollution by organic phase, poor stability, etc., and achieves low cost and good stability. , easy to operate effect

Active Publication Date: 2021-12-17
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the existing polymerization products use a large number of emulsifiers, the organic phase pollutes the environment, the cost is high, the expansion ratio of water absorption is limited, and the stability is poor. Acrylamide microspheres and preparation method thereof, in order to prepare microspheres with electric double layer structure by water-dispersed polymer method, improve product stability and water expansion multiple, and enhance product's water shutoff ability

Method used

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  • A kind of electric double layer type polyacrylamide microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In this example, polyacrylamide microspheres with an electric double layer structure were prepared by the following method.

[0077] (1) Mix 130g of acrylamide crystals, 50g of acryloyloxyethyl dimethyl benzyl ammonium chloride, 8g of 2-acrylamido-12-alkylsulfonic acid, 80g of self-made dispersant A, 0.02g N , N -Methylenebisacrylamide, 170g of ammonium sulfate, and 562g of deionized water are fully mixed and dissolved, adjusted to a pH of 6.0, transferred to a reaction kettle, sealed and blown with nitrogen for 30 minutes to remove oxygen, and the initial temperature of the reaction is controlled by a water bath to 20°C. Add 0.05g sodium diethylenetriaminepentaacetate, 0.005g sodium formate, 0.05g azobisisobutylamidine hydrochloride, 0.01g potassium persulfate, 0.012g sodium bisulfite, and stir at 250 r / min to induce free radicals Polymerization, as the reaction progressed, the temperature was raised to 45°C at a uniform rate within 1.2h and kept for 1h.

[0078] (2)...

Embodiment 2

[0081] In this example, electric double layer polyacrylamide microspheres were prepared by the following method.

[0082] (1) Mix 120g of acrylamide crystals, 46.2g of acryloyloxyethyl dimethyl benzyl ammonium chloride, 7.4g of 2-acrylamido-12-alkylsulfonic acid, 73.8g of self-made dispersant A, 0.018g N , N -Methylenebisacrylamide, 175g of ammonium sulfate, and 576g of deionized water are fully mixed and dissolved, adjusted to a pH of 6.2, transferred to a reaction kettle, sealed and blown with nitrogen for 30 minutes to remove oxygen, and the initial temperature of the reaction is controlled by a water bath to 20°C. Add 0.05g sodium diethylenetriaminepentaacetate, 0.005g sodium formate, 0.05g azobisisobutylamidine hydrochloride, 0.01g potassium persulfate, 0.012g sodium bisulfite, stir at a speed of 200-300r / min, and trigger the free base polymerization, as the reaction progressed, the temperature was raised to 45°C at a uniform rate within 1.2h and kept for 1h.

[0083] (...

Embodiment 3

[0086] In this example, electric double layer polyacrylamide microspheres were prepared by the following method.

[0087] (1) Mix 140g of acrylamide crystals, 53.8g of acryloyloxyethyl dimethyl benzyl ammonium chloride, 8.6g of 2-acrylamido-12-alkylsulfonic acid, 86.2g of self-made dispersant A, 0.022g N , N -Methylenebisacrylamide, 165g of ammonium sulfate, and 546g of deionized water were fully mixed and dissolved, adjusted to a pH of 6.0, transferred to a reaction kettle, sealed and blown with nitrogen for 30 minutes to remove oxygen, and the initial temperature of the reaction was controlled by a water bath to 20°C. Add 0.05g sodium diethylenetriaminepentaacetate, 0.005g sodium formate, 0.05g azobisisobutylamidine hydrochloride, 0.01g potassium persulfate, 0.012g sodium bisulfite, stir at a speed of 200-300r / min, and trigger the free base polymerization, as the reaction progressed, the temperature was raised to 45°C at a uniform rate within 1.2h and kept for 1h.

[0088]...

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Abstract

The present invention relates to an electric double layer polyacrylamide microsphere and a preparation method thereof. The preparation method comprises the following steps: (1) adding acrylamide, a cationic monomer, a hydrophobic monomer, a dispersant A, and a crosslinking agent to Mix evenly in the inorganic salt solution, adjust the pH value, feed nitrogen to remove oxygen and under the protection of nitrogen, add composite initiator to react to obtain polymer microsphere core; (2) acrylamide, anionic monomer, dispersant B, cross-linked Mix the coupling agent, reducing initiator, complexing agent and molecular weight regulator in the inorganic salt solution, adjust the pH value, feed nitrogen to remove oxygen, and obtain a mixed solution; (3) to the polymer microspheres obtained in step (1) adding an oxidizing initiator to the core, and then reacting the mixed solution obtained in step (2) with the polymer microsphere core obtained in step (1) under nitrogen protection to obtain the electric double layer polyacrylamide microsphere ; The present invention provides good performance.

Description

technical field [0001] The invention relates to the technical field of petrochemical polymers, in particular to an electric double-layer polyacrylamide microsphere and a preparation method thereof. Background technique [0002] With the improvement of the degree of exploitation, water production from oil wells is a common problem in the current oilfield development. Especially in the old oilfields developed by long-term water injection, due to the heterogeneity of the reservoir and the difference in the viscosity of oil and water, the injected water along the water injection well The high-permeability layer or fracture between the well and the production well breaks out and fingers, resulting in premature water flooding of the production well, a decrease in oil production, and an increase in water cut. To reduce the water output of oil wells, it is usually necessary to block high-permeability layers or fractures from water injection wells, adjust the water absorption surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F265/10C08F220/56C08F220/06C08F222/38C09K8/512C09K8/88
CPCC08F265/10C09K8/512C09K8/5083C09K8/887C09K8/882C08F220/56C08F220/06C08F222/385
Inventor 荣敏杰任凯许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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