Micromolecular heavy oil viscosity reduction polymer and preparation method thereof

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

CN112375185AActive Publication Date: 2021-02-19CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-02-19

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Abstract

The invention discloses a micromolecular thick oil viscosity reduction polymer and a preparation method thereof. The micromolecular thick oil viscosity reduction polymer comprises the following raw material components: 10 wt.% to 20 wt.% of an acrylamide (AM) monomer, 1 wt.% to 10 wt.% of a sodium acrylate monomer, 1 wt.% to 3 wt.% of a hydrophobic monomer, 1 wt.% to 3 wt.% of a temperature-resistant monomer, 0.5 wt.% to 2.5 wt.% of a surface active monomer, 0.7 wt.% to 2.5 wt.% of a chain transfer agent, 0.08 wt.% to 2 wt.% of an initiator and the balance being water. The micromolecular thick / oil viscosity reduction polymer has quick dissolving performance and good injection performance, can emulsify thick oil, has oil displacement and profile control performance at the same time, and canbe suitable for thick oil recovery of offshore oil reservoirs and low-permeability oil reservoirs.
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Description

technical field

[0001] The invention relates to the technical field of heavy oil viscosity-reducing agents, 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 declining recoverable reserves and production of conventional crude oil and increasing production costs, the exploitation of heavy oil reservoirs has received more and more attention. The high density and high viscosity of heavy oil make its exploitation more difficult, so viscosity reduction technology must be used to increase its fluidity in the production of heavy oil, so as to improve the efficiency of heavy oil production. Viscosity reduction methods for heavy oil mainly include thermal viscosity reduction, thinning and chemical viscosity reduction, etc. Among them, chemical viscosity reducers are widely used due to the advantages of less pollution, less dosage...

Examples

Embodiment 1

[0044] This embodiment synthesizes a kind of small molecule heavy oil viscosity reducing polymer, and its raw material comprises by mass:

[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;

[0046] The hydrophobic monomer used was cetyldimethylallyl ammonium chloride.

[0047] The temperature-resistant monomer used is sodium 4-styrenesulfonate.

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

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

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

[0051] The preparation process includes the following steps:

[0052] (1) Weigh respectively 8.672g of acrylamide, 3.845g of sodium acrylate, 0.898g of hydrophobic monomer, 0.722g of temperature-resistant monomer, and 0.37...

Embodiment 2

[0058] This embodiment synthesizes a kind of small molecule heavy oil viscosity reducing polymer, and its raw material comprises by mass:

[0059] 6.899g of acrylamide; 2.344g of sodium acrylate; 1.021g of hydrophobic monomer; 0.986g of temperature-resistant monomer; 0.675g of surface active monomer; 0.078g of initiator;

[0060] The hydrophobic monomer used was cetyldimethylallyl ammonium chloride.

[0061] The temperature-resistant monomer used is sodium 4-styrenesulfonate.

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

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

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

[0065] The preparation process includes the following steps:

[0066] (1) Weigh respectively 6.899g of acrylamide, 2.344g of sodium acrylate, 1.021g of hydrophobic monomer, 0.986g of temperature-resistant monomer, and 0.675g of surface-active mon...

Embodiment 3

[0072] This embodiment synthesizes a kind of small molecule heavy oil viscosity reducing polymer, and its raw material comprises by mass:

[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;

[0074] The hydrophobic monomer used was cetyldimethylallyl ammonium chloride.

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

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

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

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

[0079] The preparation process includes the following steps:

[0080] (1) Weigh respectively 8.672g of acrylamide, 3.845g of sodium acrylate, 0.898g of hydrophobic monomer, 0.722g of temperature-re...