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Diffluent salt tackifying amphiphilic polymer oil-displacing agent and preparation method thereof

A technology of amphiphilic polymer and oil displacement agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve the problems of limiting the viscosity-increasing ability of salt-increased polymers, poor water solubility of polymers, and difficulty in dissolving polymers, etc. problem, achieve the effect of overcoming the low content of hydrophobic monomer, increasing the solubility and reducing the dissolution time

Active Publication Date: 2019-02-19
ANHUI TIANRUN CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existence of a large amount of hydrophobic monomers in this type of salt-increased amphiphilic polymer leads to poor water solubility of the polymer, and its dissolution time is greatly prolonged. When the molar ratio of hydrophobic monomer exceeds 2%, the polymer is difficult to dissolve
This greatly limits the further improvement of the viscosifying ability of salt viscosifying polymers.

Method used

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  • Diffluent salt tackifying amphiphilic polymer oil-displacing agent and preparation method thereof
  • Diffluent salt tackifying amphiphilic polymer oil-displacing agent and preparation method thereof
  • Diffluent salt tackifying amphiphilic polymer oil-displacing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of association functional monomer N-methyl-N-allyl lauroyl propane sulfonic acid inner salt (MALPS), comprises the following steps:

[0037] S1. Synthesize the intermediate monomer 3-(N-allyl-N-methylamino) propane-1-sodium sulfonate through nucleophilic substitution reaction with N-methyl sodium taurate and allyl chloride;

[0038] S2. The sodium 3-(N-allyl-N-methylamino)propane-1-sulfonate prepared in step S1 is reacted with lauroyl chloride by quaternization to obtain the product.

[0039] The molar ratio of the N-methyl sodium taurate and allyl chloride is 0.9:1; the initiation temperature of the nucleophilic substitution reaction is 50°C; the 3-(N-allyl-N-methyl The molar ratio of amino)propane-1-sodium sulfonate to lauroyl chloride is 0.625:1; the initiation temperature of the quaternization reaction is 5°C. Specific synthetic routes, such as figure 1 shown.

Embodiment 2

[0041] The molar ratio of each polymerized monomer of the easily soluble salt viscosity-increasing amphiphilic polymer oil displacement agent is AM:MALPS=98:2, the mass concentration of the monomer in the solvent deionized water is 25%, and the amount of the initiator accounts for the total amount of the monomer. 0.05% by mass, the initiation temperature is 43°C, and the copolymerization reaction is carried out by free radical polymerization. Its specific synthesis method is as follows:

[0042] A soluble salt viscosity-increased amphiphilic polymer oil displacement agent was synthesized by free radical polymerization. Accurately weigh a certain amount of acrylamide, N,N-dimethyl-N-methacrylamidopropyl-N-propanesulfonic acid inner salt, N,N-dimethyldodecyl-p-vinylbenzyl Ammonium chloride was dissolved in a certain amount of deionized water, the mol ratio of each polymerized monomer was AM:MALPS=98:2, and the total mass concentration of the monomer was 25%, then placed in a 25...

Embodiment 3

[0044] The molar ratio of each polymerized monomer of the soluble salt viscosity-increasing amphiphilic polymer oil displacement agent is AM:MALPS=97.5:2.5, the mass concentration of the monomer in the solvent deionized water is 25%, and the amount of the initiator accounts for the total amount of the monomer. 0.05% by mass, the initiation temperature is 43°C, and the copolymerization reaction is carried out by free radical polymerization. Its specific synthesis method is as follows:

[0045]A soluble salt viscosity-increased amphiphilic polymer oil displacement agent was synthesized by free radical polymerization. Accurately weigh a certain amount of acrylamide, N,N-dimethyl-N-methacrylamidopropyl-N-propanesulfonic acid inner salt, N,N-dimethyldodecyl-p-vinylbenzyl Ammonium chloride was dissolved in a certain amount of deionized water, the mol ratio of each polymerized monomer was AM:MALPS=97.5:2.5, and the total mass concentration of the monomer was 25%, then placed in a 25...

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Abstract

The invention belongs to the field of preparation of high-salinity oil reservoir oil-displacing agent and particularly relates to a diffluent salt tackifying amphiphilic polymer oil-displacing agent and a preparation method thereof. The diffluent salt tackifying amphiphilic polymer oil-displacing agent is prepared through copolymerization reaction by taking acrylamide and N-methyl-N-ally lauryl sultone as polymerization monomers with existence of initiator. The diffluent salt tackifying amphiphilic polymer oil-displacing agent synthesizes hydrophobic monomers and betaine monomers into one associated monomers, and through the powerful hydration capacity of betaine groups and the dissolution capacity of hydrophobic groups, overcomes the problems of low content of hydrophobic monomers and long dissolution time of existing oil-displacing agents. In the prior art, ternary compolymerized salt tackifying amphiphilic polymers are relatively poor in water solubility and have a dissolution timelonger than 300 min, while the diffluent salt tackifying amphiphilic polymer oil-displacing agent can reach a minimum dissolution time as short as 100 min. Therefore, the diffluent salt tackifying amphiphilic polymer oil-displacing agent greatly improves solubility and shortens the dissolution time and further has huge potential in application to high-salinity oil reservoir oil-displacing agents.

Description

technical field [0001] The invention belongs to the field of oil displacement agent preparation for high-salinity oil reservoirs, and in particular relates to an easily soluble salt viscosity-increasing amphiphilic polymer oil displacement agent and a preparation method thereof. Background technique [0002] Due to the electrostatic shielding effect of salt, the viscosity of conventional amphiphilic polymers is greatly reduced, which cannot meet the requirements of polymer flooding in high-salt reservoirs. In high-salt oil reservoirs, the salt ions stretch the molecular conformation and increase the hydrodynamic radius, resulting in an increase in viscosity. At the same time, the introduction of hydrophobic groups forms a reversible spatial network structure in the solution, so that it has good viscosity-increasing, temperature-resistant, salt-resistant, and shear-resistant properties. oil repellant. However, the presence of a large amount of hydrophobic monomers in this t...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F226/02C09K8/588C09K8/88
Inventor 康万利汪艳陈建波李大强陶阿晖张传银杨晓菲乔磊磊焦剑杨红斌朱洲
Owner ANHUI TIANRUN CHEM CO LTD