Multi-crosslinking core-shell type polymer microsphere, modifying and flooding agent, and preparation method and application thereof

A polymer, core-shell technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of whether the expansion performance, elasticity and heat resistance stability of polymer microspheres can be enhanced at the same time.

Active Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that there is a contradiction between the strength and water-absorbing swelling performance of polymer microspheres in the prior art, which causes the problem that the expansion performance, elasticity, and heat-resistant stability of the polymer microspheres cannot be simultaneously enhanced. Provide a kin...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] First add 660g 7# white oil, 70gSPAN80, 8gTWEEN80 in the reaction kettle, stir until completely mixed, as a mixed oil phase; add 260g water, 8g silica sol (40% content), 320g acrylamide, 50g of methacryloylpropyltrimethylammonium chloride, 18g of potassium acetate, 0.5g of sodium diethylenetriaminepentaacetate, 12g of urea, 1.0g of methylenebisacrylamide, stirred and dissolved evenly as the water phase I; Add 280g of water, 10g of CTAB-modified nano-montmorillonite DK1 (Zhejiang Fenghong Clay Chemical Co., Ltd.), 300g of acrylamide, 100g of sodium acrylate, 18g of potassium acetate, 0.5g of sodium diethylenetriaminepentaacetate, and 0.5g of iso Propanol 10g, urea 12g, methylenebisacrylamide 0.8g, stir the solvent evenly, add 20g of isopropanol solution with 2g of azobisisobutyronitrile, stir and dissolve together as water phase II; Ammonium and sodium bisulfite were respectively configured into 2.0% and 0.2% aqueous solutions for later use. Slowly add the water phase I...

Embodiment 2

[0042] First add 660g 5# white oil, 72gSPAN80, 5gTWEEN60 in the reaction kettle, stir until completely mixed, as a mixed oil phase; add 270g water, 7g silica sol (40% content), 300g acrylamide, 80g of methacryloylpropyltrimethylammonium chloride, 18g of sodium acetate, 0.5g of ethylenediaminetetraacetic acid disodium salt, 12g of urea, and 1.1g of methylenebisacrylamide, stirred and dissolved evenly as the water phase I; In another container, add 270g water, 11g dodecyl dihydroxy ammonium modified nano-montmorillonite DK2 (Zhejiang Fenghong Clay Chemical Co., Ltd.), 300g acrylamide, 120g 2-acrylamido-2-methylpropane Sodium sulfonate, sodium acetate 18g, edetate disodium salt 0.5g, isopropanol 10g, urea 12g, polyethylene glycol diacrylate 2.0g, stir the solvent evenly and add 2g azobisisoheptyl 20g of isopropanol solution of nitrile was stirred and dissolved uniformly as the water phase II; ammonium persulfate and sodium bisulfite were respectively prepared into 2.0% and 0.2% a...

Embodiment 3

[0045]First add 680g 120# solvent oil and 78g SPAN60 to the reaction kettle, stir until completely mixed, as a mixed oil phase; add 270g water, 15g silica sol (40%), 300g acrylamide, 110g acrylamide to a container of a certain size Oxyethyltrimethylammonium chloride, sodium acetate 20g, ethylenediaminetetraacetic acid disodium salt 1.0g, isopropanol 15g, urea 10g, pentaerythritol triacrylate 2.1g, stirred and dissolved evenly as water phase I; Add 270g water, 7g octadecyl dimethyl benzyl ammonium chloride modified nano-montmorillonite DK4 (Zhejiang Fenghong Clay Chemical Co., Ltd.), 300g acrylamide, 150g sodium vinylbenzene sulfonate, Sodium acetate 20g, edetate disodium salt 0.5g, urea 12g, stir the solvent evenly, add 20g of isopropanol solution with 2g of azobisisoheptanonitrile and 1.0g of divinylbenzene, and stir together to dissolve Uniformly used as the aqueous phase II; ammonium persulfate and sodium bisulfite were respectively prepared into 2.0% and 0.2% aqueous solut...

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Abstract

The invention relates to a multi-crosslinking core-shell polymer microsphere, a modifying and flooding agent, and a preparation method and application thereof. The method mainly solves the problems that in the prior art, polymer microspheres are mainly of homogeneous structures, the variety of used cross-linking agents is single, only one chemical crosslinking agent is introduced generally, and although the microspheres can expand to a certain degree, the profile control and plugging performance on medium-high permeability oil reservoirs is poor. The multi-crosslinking core-shell type polymermicrosphere comprises a polymer I inner core and a polymer II outer shell, and molecules of the polymer I and the polymer II independently contain an inorganic crosslinking agent structural unit and an organic crosslinking agent structural unit, so that the problems are well solved, and the microsphere can be applied to field application for increasing the recovery ratio of an oil field.

Description

technical field [0001] The invention relates to a multi-crosslinked core-shell polymer microsphere, a control and displacement agent, a preparation method and an application thereof. Background technique [0002] Water production from oil wells is a common problem in oilfield development, especially in 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 easily enters the high-permeability zone or fracture and bypasses the medium-low permeability zone, causing oil and water to burst along the high-permeability zone or fracture between the water injection well and the production well. And fingering, resulting in premature water flooding of production wells, decreased oil production and increased water cut, thereby reducing the sweep coefficient of injected water and resulting in low or no production of medium and low permeability layers. Improving the sweep coe...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F222/38C08F220/06C08F222/20C08F212/36C08F226/02C08F220/58C08F228/02C09K8/512C09K8/588C09K8/88
CPCC08F220/56C09K8/512C09K8/588C09K8/887C09K2208/12
Inventor 夏燕敏郭艳姜建伟苏智青许汇王兰
Owner CHINA PETROLEUM & CHEM CORP
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