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Production of cationic microsphere with crosslinked swelling function

A cationic, microsphere technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problems of easy to form micelles, easy chain scission, poor solubility, etc., to achieve cost reduction, good injection performance, Construction injection convenience effect

Inactive Publication Date: 2007-09-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When oilfield sewage is used for injection, certain inorganic ions, organic substances and mechanical impurities in the sewage may reduce the reactivity of the cross-linking agent and affect the rate of the cross-linking reaction, resulting in flocculation and precipitation of the system, and even failure to form cross-linked polymers Thread balls affect the water blocking effect
In addition, the gel-type profile control and water shutoff agent also has disadvantages such as poor solubility, long liquid preparation time, easy to form gelatinous groups, and easy to break chains due to shearing, which limits its application.

Method used

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  • Production of cationic microsphere with crosslinked swelling function
  • Production of cationic microsphere with crosslinked swelling function
  • Production of cationic microsphere with crosslinked swelling function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh sorbitan monooleate 0.07g (1.6 × 10 -4 mol), acrylamide 5.7g (0.08mol, dissolved in 16ml of water), 18g of methacryloyloxyethyltrimethylammonium chloride solution, which contains 14g of methacryloyloxyethyltrimethylammonium chloride ( 0.08mol), N, N'-methylenebisacrylamide 0.025g (1.6×10 -4 mol), measure 64ml of cyclohexane, add it into a 250ml three-necked flask, stir and mix evenly, weigh 0.043g of potassium persulfate (1.6×10 -4 mol), sodium sulfite 0.01g (8×10 -5 mol) into the three-necked flask, after fully stirring, put the three-necked flask into a 40°C constant temperature water bath, the stirring speed is 200r / min, and react to the predetermined time (6 to 8 hours), take out the three-necked flask, and pour it after natural cooling out product.

[0019] Note: The total amount of the mixed medium in this example is 80mL, the same below.

Embodiment 2

[0021] Weigh sorbitan monostearate 0.07g (1.6 × 10 -4 mol), acrylamide 7.6g (0.107mol, dissolved in 16ml water), methacryloyloxyethyltrimethylammonium chloride 12g, which contains methacryloyloxyethyltrimethylammonium chloride 9.36g ( 0.053mol), N, N'-methylenebisacrylamide 0.025g (1.6×10 -4 mol), measure 64ml of industrial white oil, add it to a 250ml three-necked flask, stir and mix evenly, weigh 0.036g of ammonium persulfate (1.6×10 -4 mol), sodium bisulfite 0.008g (8×10 -5 mol) into the three-necked flask, after fully stirring, put the three-necked flask into a 40°C constant temperature water bath, the stirring speed is 300r / min, and react to the predetermined time (6 to 8 hours), take out the three-necked flask, and pour it after natural cooling The product was obtained, and the particle size of the microspheres was 10-40 μm (as shown in Figure 2) through optical microscope characterization.

Embodiment 3

[0023] Weigh sorbitan monooleate 0.3g (7 × 10 -4 mol), polyoxyethylene sorbitan monostearate 0.13g (1×10 -4 mol), acrylamide 14.9g (0.21mol, dissolved in 20ml water), methacryloyloxyethyltrimethylammonium chloride solution 15.8g, which contains methacryloyloxyethyltrimethylammonium chloride 12.3 g (0.07mol), N, N'-methylenebisacrylamide 0.123g (8×10 -4mol), measure 60ml of 120# solvent oil, add it to a 250ml three-necked flask, stir and mix evenly, weigh 0.22g of potassium persulfate (8×10 -4 mol), azobisisobutyronitrile 0.07g (4×10 -4 mol) into the three-necked flask, after fully stirring, put the three-necked flask into a 70°C constant temperature water bath, the stirring speed is 300r / min, and react to the predetermined time (4 to 6 hours), take out the three-necked flask, and pour it after natural cooling out product.

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Abstract

Production of cationic micro-sphere with cross-linking swelling function is carried out by taking persulfate and sulfite or persulfate and azo-diisobutyl nitrile binary composite or persulfate, sulfite and 2,2'-azo-(2-(2-imidazoline-2-radical)propane)dihydrochloride(VA-044)ternary composite as initiating agent, adding into dispersant and cross-linking agent, initiating DMC monomer and AM monomer in mixed medium of cyclohexane-water or industrial white oil-water or 120#solvent oil-water and reverse suspension polymerizing to obtain the final product. The grain size is 1-50 mu m, it has controllable swelling speed ratio and can be used for third oil-extraction plugging materials.

Description

technical field [0001] The invention discloses a method for preparing cationic cross-linked swelling functional microspheres, which belongs to the technical field of preparation of functional polymer microspheres. Cross-linked polymer microspheres with positive charges on the surface were prepared by reverse phase suspension polymerization. The microspheres have a particle size of 1-50 μm and gradually swell after absorbing water. The swelling rate and swelling ratio can be controlled. Background technique [0002] How to improve the seepage status of heterogeneous reservoirs, increase the sweep coefficient and swept volume of displacement water, and enhance oil recovery has become a major issue to be solved urgently in the process of tertiary oil recovery. At present, the method of plugging high-permeability layers of oil wells with chemical reagents is widely used internationally and domestically, that is, the so-called profile control and water plugging method. The chemic...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/56C08F4/04C08F4/30C08F2/18C09K8/588
Inventor 陈明清刘机关叶卫保倪忠斌肖建洪徐亚鹏封姣王珂
Owner JIANGNAN UNIV
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