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Method for preparing functional composite microsphere with multi-layer core-shell structure and application thereof

A technology of multi-layer core-shell structure and composite microspheres, which is applied in deep profile control and water plugging during high water-cut periods of oil exploitation, preparation of functional polymer microspheres, and in the field of oil exploitation

Inactive Publication Date: 2011-07-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing water-soluble polymer microspheres generally only have an adjustment effect on the reservoir profile within 20 meters from the water injection well.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 10g of styrene and 0.5g of polyvinylpyrrolidone in turn, dissolve them in 80mL of ethanol, raise the temperature to 70°C, and slowly drop in 0.25g of azobisisobutyronitrile dissolved in 20mL of ethanol at a stirring speed of 400r / min, 0.5 After h drops, continue to react for 5h.

[0025] Weigh 10g of acrylamide, 0.8g of methacryloyloxyethyltrimethylammonium chloride, 0.3g of N,N-methylbisacrylamide, and 0.5g of polyvinylpyrrolidone, dissolve them in 80mL of ethanol, and heat up to 70 ℃, at a stirring speed of 400r / min, slowly drop 0.2g of azobisisobutyronitrile dissolved in 20mL of ethanol into the core system prepared above, after the dropwise addition, continue to keep warm for 2h.

[0026] Sequentially weigh 5.0g of acrylamide, 2.0g of sodium acrylate, 0.3g of N,N-methylbisacrylamide, and 0.5g of polyvinylpyrrolidone, dissolve them in 80mL of ethanol, raise the temperature to 70°C, and stir at 400r / min. Slowly add 0.15 g of azobisisobutyronitrile dissolved in ...

Embodiment 2

[0029] Weigh 20g of styrene and 1.5g of polyvinylpyrrolidone in sequence, dissolve them in 80mL of chloroform, raise the temperature to 60°C, and slowly drop in 0.5g of benzoyl peroxide dissolved in 20mL of chloroform at a stirring speed of 500r / min for 0.5h After dripping, continue to react for 5h.

[0030] Sequentially weigh 20g of acrylamide, 1.5g of dimethyl dienyl ammonium chloride, 0.8g of N,N-methylenebisacrylamide, and 1.5g of polyvinylpyrrolidone, dissolve them in 80mL of chloroform, heat up to 60°C, and At a stirring speed of 500r / min, slowly drop 0.2g of benzoyl peroxide dissolved in 20mL of chloroform into the nuclear system prepared above, after the dropwise addition, continue the heat preservation reaction for 3h.

[0031] Sequentially weigh 8.0g of acrylamide, 1.0g of sodium acrylate, 0.8g of N,N-methylenebisacrylamide, and 1.0g of polyvinylpyrrolidone, dissolve them in 80mL of chloroform, heat up to 60°C, and stir at 500r / min , slowly drop 0.1 g of benzoyl per...

Embodiment 3

[0033] Sequentially weigh 5.0g of styrene, 0.5g of polyethylene glycol, dissolve in 80mL of methanol, raise the temperature to 40°C, and slowly drop in 0.15g of ammonium persulfate solution dissolved in 20mL of methanol at a stirring speed of 400r / min, 0.5 After h drops, continue to react for 4h.

[0034] Weigh 12g of acrylamide, 0.4g of N,N-dimethylaminoethyl acrylate hydrochloride, 0.3g of polyethylene glycol diacrylate, and 0.5g of polyethylene glycol in 80mL of methanol, and heat up to 40°C , at a stirring speed of 400r / min, slowly drop 0.20g of ammonium persulfate solution dissolved in 20mL of methanol into the nuclear system prepared above, after the dropwise addition, continue to keep warm for 3h.

[0035]Weigh 4.0g of acrylamide, 0.5g of sodium methacrylate, 0.3g of N,N-methylenebisacrylamide, and 0.5g of polyethylene glycol in 80mL of methanol, heat up to 40°C, and stir at 400r / min Slowly drop 0.1 g of ammonium persulfate solution dissolved in 20 mL of methanol into ...

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Abstract

The invention discloses a method for preparing functional composite microsphere with a multi-layer core-shell structure and application thereof, and relates to the technical fields of functional macromolecular microsphere preparation and petroleum exploitation, in particular to the technical field of deep profile control water shutoff during high water-cut period of petroleum exploitation. The functional composite microsphere is prepared by a dispersion polymerization method which comprises the following steps: forming a core part by polymerization of a styrene monomer, and forming a cation shell part by copolymerization of acrylamide, the cation monomer and a crosslinking agent; and forming an anion shell part by copolymerization of acrylamide, anion monomer and the crosslinking agent. The functional composite microsphere is characterized in that the size of the microsphere is between 1,500 and 2,000nm and the microsphere is white solid powder or polymer emulsion; the expansion multiplying power of the microsphere is improved by 20 to 50 times after 5-day hydration; and therefore, the functional composite microsphere can be used for effective plugging at the pore throat of a bottom high permeability zone during high water-cut period of the petroleum exploitation.

Description

technical field [0001] The invention discloses a method for preparing functional composite microspheres with a multilayer core-shell structure, which belongs to the technical field of preparation of functional polymer microspheres. The utility model relates to a multi-layer core-shell structure functional compound microsphere as a deep profile control water shutoff agent, which belongs to the field of oil exploitation, and specifically relates to the technical field of deep profile control water shutoff during oil exploitation high water cut period. Background technique [0002] Water flooding is commonly used in my country's oilfields, and the formation heterogeneity is serious. Due to the complex geology of the reservoir, the water cut rises faster in the middle and late stages of development. At present, the average water content of oil well production has reached more than 80%, and some old oil fields in the eastern region have water content of more than 90%. Therefore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F257/02C08F265/10C08F285/00C09K8/44
Inventor 刘士荣张红武倪忠斌毛明富龚雁陈明清
Owner JIANGNAN UNIV
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