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A kind of small molecule heavy oil viscosity reducing polymer and preparation method thereof

A technology of small molecules and polymers, applied in drilling compositions, chemical instruments and methods, etc., to achieve the effects of good injection performance, enhanced amphiphilicity, and rapid dissolution performance

Active Publication Date: 2022-08-02
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that conventional heavy oil viscosity reducers cannot have both good emulsification performance and high-efficiency control and displacement performance and the stringent requirements for polymer molecular weight in offshore / low-permeability reservoirs, the purpose of the present invention is to provide a suitable for offshore / low-permeability oil A small-molecule heavy oil viscosity-reducing polymer and its preparation method. The small-molecule heavy-oil viscosity-reducing polymer can not only emulsify heavy oil, but also have high-efficiency control and displacement performance. At the same time, the small molecule structure improves its dissolution rate and injection property. Improvement, suitable for offshore reservoirs and low permeability reservoirs

Method used

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  • A kind of small molecule heavy oil viscosity reducing polymer and preparation method thereof
  • A kind of small molecule heavy oil viscosity reducing polymer and preparation method thereof
  • A kind of small molecule heavy oil viscosity reducing polymer and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0044] The present embodiment synthesizes a small-molecule heavy oil viscosity-reducing polymer, and its raw materials, calculated by mass, include:

[0045] Acrylamide monomer 8.672g; sodium acrylate monomer 3.845g; hydrophobic monomer 0.898g; temperature-resistant monomer 0.722g; surface active monomer 0.375g; initiator 0.06g; chain transfer agent 0.788g; distilled water 34.64g.

[0046] The hydrophobic monomer used was cetyldimethylallylammonium chloride.

[0047] The temperature-resistant monomer used was sodium 4-styrene sulfonate.

[0048] The surface-active monomer used was vinyl polyoxyethylene ether.

[0049] The initiator used is a mixed system of potassium persulfate / sodium bisulfite (molar ratio 1:1).

[0050] The chain transfer agent used was a RAFT chain transfer agent of formula I.

[0051] The preparation process includes the following steps:

[0052] (1) Weigh out 8.672g of acrylamide, 3.845g of sodium acrylate, 0.898g of hydrophobic monomer, 0.722g of tempe...

Embodiment 2

[0058] The present embodiment synthesizes a small-molecule heavy oil viscosity-reducing polymer, and its raw materials, calculated by mass, include:

[0059] Acrylamide 6.899g; sodium acrylate 2.344g; hydrophobic monomer 1.021g; temperature-resistant monomer 0.986g; surface active monomer 0.675g; initiator 0.078g; chain transfer agent 0.672g; distilled water 37.325g.

[0060] The hydrophobic monomer used was cetyldimethylallylammonium chloride.

[0061] The temperature-resistant monomer used was sodium 4-styrene sulfonate.

[0062] The surface-active monomer used was vinyl polyoxyethylene ether.

[0063] The initiator used is a mixed system of potassium persulfate / sodium bisulfite (molar ratio 1:1).

[0064] The chain transfer agent used was a RAFT chain transfer agent of formula I.

[0065] The preparation process includes the following steps:

[0066] (1) Weigh out 6.899g of acrylamide, 2.344g of sodium acrylate, 1.021g of hydrophobic monomer, 0.986g of temperature-resis...

Embodiment 3

[0072] The present embodiment synthesizes a small-molecule heavy oil viscosity-reducing polymer, and its raw materials, calculated by mass, include:

[0073] Acrylamide monomer 8.672g; sodium acrylate monomer 3.845g; hydrophobic monomer 0.898g; temperature-resistant monomer 0.722g; surface active monomer 0.375g; initiator 0.06g; chain transfer agent 0.788g; distilled water 34.64g.

[0074] The hydrophobic monomer used was cetyldimethylallylammonium chloride.

[0075] The temperature resistant monomer used was 2-acrylamide-2-methylpropanesulfonic acid (AMPS).

[0076] The surface-active monomer used was vinyl polyoxyethylene ether.

[0077] The initiator used is a mixed system of potassium persulfate / sodium bisulfite (molar ratio 1:1).

[0078] The chain transfer agent used was a RAFT chain transfer agent of formula I.

[0079] The preparation process includes the following steps:

[0080] (1) Weigh out 8.672g of acrylamide, 3.845g of sodium acrylate, 0.898g of hydrophobic ...

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Abstract

The invention discloses a small-molecule heavy oil viscosity-reducing polymer and a preparation method thereof. The raw material composition of the small molecule heavy oil viscosity reducing polymer includes the following components: acrylamide (AM) monomer 10wt.%~20wt.%, sodium acrylate monomer 1wt.%~10wt.%, hydrophobic monomer 1wt.% ~3wt.%, temperature resistant monomer 1wt.%~3wt.%, surface active monomer 0.5wt.%~2.5wt.%, chain transfer agent 0.7wt.%~2.5wt.%, initiator 0.08wt.% ~2 wt.%, balance of water. The small-molecule thick / oil viscosity-reducing polymer of the present invention has fast dissolving performance and good injection performance, can emulsify heavy oil and has both oil displacement and profile control performance, and can be suitable for offshore oil reservoirs and low-permeability oil reservoirs. Heavy oil extraction.

Description

technical field [0001] The invention relates to the technical field of viscosity reducing agents for heavy oil, in particular to a small-molecule heavy oil viscosity reducing polymer suitable for offshore / low-permeability heavy oil reservoirs and a preparation method thereof. Background technique [0002] Due to the continuous decline of recoverable reserves and production of conventional crude oil and the continuous increase of production costs, the exploitation of heavy oil reservoirs has received more and more attention. The high density and high viscosity of heavy oil make it difficult to recover. Therefore, viscosity reduction technology must be used to increase the fluidity of heavy oil in the recovery process, so as to improve the recovery efficiency of heavy oil. Viscosity reduction methods for heavy oil mainly include thermal viscosity reduction, dilute viscosity reduction, and chemical viscosity reduction. Among them, chemical viscosity reducers are widely used du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/56C08F220/06C08F226/02C08F212/14C08F220/58C08F2/38C09K8/584C09K8/508
CPCC08F283/065C08F2/38C09K8/584C09K8/5083C08F220/56C08F220/06C08F226/02C08F212/30C08F220/585
Inventor 杨红斌李哲吴海荣康万利范海明刘同敬宋兆杰于田田张阳吴飞鹏张亮
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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