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Core-shell polymer suitable for oilfield produced water and preparation method of core-shell polymer

A technology of polymer and produced water, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor shear resistance of HPAM, and achieve the effect of outstanding economic benefits and mild reaction conditions

Active Publication Date: 2016-11-09
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the above analysis, it can be seen that the single structural unit (-CONH 2 and-COO - ), does not meet the requirements of polymer preparation with produced water, and HPAM has poor shear resistance. These factors have become bottlenecks that limit the popularization and application of produced water injection HPAM

Method used

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  • Core-shell polymer suitable for oilfield produced water and preparation method of core-shell polymer
  • Core-shell polymer suitable for oilfield produced water and preparation method of core-shell polymer
  • Core-shell polymer suitable for oilfield produced water and preparation method of core-shell polymer

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Effect test

Embodiment 1

[0035] Embodiment 1 methyl-N, the preparation of N-dihexyl twin tail core-shell polymer

[0036] (1) Surface modification of ultrafine silicon dioxide by coupling agent: add 12.5g nanometer silicon dioxide and 130g methanol into a three-necked bottle, disperse with ultrasonic vibration for 30min, add 13.5g vinyltrimethoxysilane and Stir, react at a temperature of 60°C for 8 hours, cool, wash with methanol, vacuum filter, and dry to obtain surface-modified ultrafine silica;

[0037] (2) Polyamide-amine hybrid ultrafine silica: add 6.0g of surface-modified ultrafine silica and 85g of methanol into a three-necked bottle, disperse by ultrasonic oscillation for 30min, add 1.0 generation polyamide- Stir 5.6g of amine, react at 25°C for 6h, wash with methanol, vacuum filter, and dry to obtain polyamide-amine hybrid ultrafine silica;

[0038] (3) Functional modification of polyamide-amine hybrid ultrafine silica: 3.8g polyamide-amine hybrid ultrafine silica and 38g dimethyl sulfoxide...

Embodiment 2

[0043] Embodiment 2 methyl-N, the preparation of N-dioctyl twin-tail core-shell polymer

[0044] (1) Surface modification of ultra-fine silica by coupling agent: add 15g nanometer silica and 150g methanol into a three-neck bottle, disperse by ultrasonic oscillation for 30min, add 15g of coupling agent vinyltrimethoxysilane and stirred, reacted at a temperature of 60°C for 8 hours, cooled, washed with methanol, vacuum filtered, and dried to obtain surface-modified ultrafine silica;

[0045] (2) Polyamide-amine hybrid ultra-fine silica: add 8.0g of surface-modified ultra-fine silica and 100g of methanol into a three-necked bottle, disperse by ultrasonic oscillation for 30min, add 1.0 generation polyamide- Stir 8.5g of amine, react at 25°C for 8h, wash with methanol, vacuum filter, and dry to obtain polyamide-amine hybrid ultrafine silica;

[0046] (3) Functional modification of polyamide-amine hybrid ultrafine silica: 4.2g polyamide-amine hybrid ultrafine silica and 45g dimethy...

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Abstract

The invention discloses a core-shell polymer suitable for oilfield produced water and a preparation method of the core-shell polymer. The core-shell polymer takes functional polyamide-amine hybrid ultrafine silicon dioxide as the core, acrylamide and acrylic acid as hydrophilic monomers, and methyl-N,N-dihexyl(octyl)acrylamide as a hydrophobic monomer, a redox system triggers polyreaction to prepare hydrogel, and drying, crushing and screening are performed to obtain the core-shell polymer. Preparation of functional polyamide-amine hybrid ultrafine silicon dioxide comprises surface modification of a coupler to ultrafine silicon dioxide, polyamide-amine hybridization of ultrafine silicon dioxide, and functional modification of polyamide-amine hybrid ultrafine silicon dioxide. The core-shell polymer adopts a branched structure, and after dissolution in oilfield produced water, the supermolecule effect on a hydrophilic chain can form a reversible network structure to guarantee the viscosity increasing capability, so that the shearing resistance and the long-term stability of the polymer are improved, and the purpose of produced water injection allocation with polymer for reservoir oil displacement is achieved.

Description

technical field [0001] The invention relates to a core-shell polymer suitable for oilfield produced water in the oilfield development process and a preparation method thereof, belonging to the fields of water-soluble polymer synthesis and oilfield chemistry. Background technique [0002] Reservoirs in the middle and late stages of water injection development are adversely affected by oil-water mobility. Polymers finger along high-permeability layers and flow around high oil-bearing areas. A large amount of crude oil is not swept, and the recovery degree of water flooding is low. According to statistics, my country's onshore oilfields have undergone elastic energy recovery and water flooding, and the recovery rate of crude oil is less than 40% (He Jiangchuan et al., Oilfield Development Strategy and Replacement Technology [J], Acta Petroleum Sinica, 2012, 33(3): 519 -525). As an important tertiary oil recovery technology, polymer flooding mainly improves the development effec...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/56C08F220/06C08F220/54C08F4/40C08G83/00C09K8/588
CPCC08F4/40C08F283/004C08G83/001C09K8/588C08F220/56
Inventor 蒲万芬刘锐杜代军辜炯益
Owner SOUTHWEST PETROLEUM UNIV
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