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Water-soluble hyperbranched polymer thick oil viscosity reducing agent and preparation method thereof

A hyperbranched polymer, water-soluble technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of complicated synthesis or compounding steps, small reservoir condition range, poor temperature and salt resistance, etc. , to achieve the effect of low cost, simple synthesis steps, strong temperature and salt resistance

Active Publication Date: 2019-12-20
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the current small molecule heavy oil viscosity reducer has a small range of applicable reservoir conditions, poor temperature and salt resistance, and the existing polymer heavy oil viscosity reducer has poor solubility and cumbersome synthesis or compounding steps, the present invention Provide a water-soluble hyperbranched polymer thick oil viscosity reducer, the viscosity reducer has strong water solubility, can be quickly dispersed in water, has a good emulsification and viscosity reduction effect on heavy oil, and the emulsion is easy to break. The preparation process is simple and the source of raw materials widely

Method used

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  • Water-soluble hyperbranched polymer thick oil viscosity reducing agent and preparation method thereof
  • Water-soluble hyperbranched polymer thick oil viscosity reducing agent and preparation method thereof
  • Water-soluble hyperbranched polymer thick oil viscosity reducing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] (a) Functional modification of backbone monomers

[0052] The 2.0 generation or 3.0 generation backbone monomer and maleic anhydride are sequentially dissolved in 2 to 3 times the mass ratio of N,N-dimethylformamide solvent in a molar ratio of 1:8 or 1:16; Place the system in an ice-water bath (below 10°C), and pass nitrogen gas for 40 minutes at the same time, and dissolve completely under stirring conditions; react for 6h to 7h at room temperature and avoid light; Precipitate milky white, light yellow powdery substance, which is relatively pure functionalized skeleton monomer.

[0053] Taking the modified 2.0 generation as an example, the preparation flow chart of the functionalized 2.0 skeleton monomer is as follows figure 1 shown.

[0054] Modified 2.0 generation polyamide-amine, its molecular structural formula is as shown in (1):

[0055]

[0056] Modified 3.0 generation polyamide-amine, its molecular structural formula is as shown in (2):

[0057]

[00...

Embodiment 2

[0068] The synthesis of water-soluble hyperbranched heavy oil viscosity reducer, its preferred scheme is as follows:

[0069] First, put a certain amount of deionized water in the reaction vessel, and mix 0.4% of functionalized backbone monomer 2.0 generation polyamidoamine, 14.5% of acrylamide, and 40.1% of modified The octylphenol polyoxyethylene ether maleic acid monoester (shown in formula 3, wherein n is 10, m is 8) and 45% sodium olefin sulfonate monomer (n 2 =14~16, Chengdu Kelong Chemical Reagent Factory, AOS liquid) mix and stir evenly, be mixed with the solution (mass fraction meter) that monomer concentration is 25%;

[0070] Secondly, by adding sodium hydroxide to adjust the pH value of the solution to 6.5, then under 45°C water bath heating and a stirring speed of 250r / min, the inert gas nitrogen was used for protection for 40min; then ammonium persulfate solution was slowly added dropwise, the over Ammonium persulfate in the ammonium sulfate solution is 0.01% re...

Embodiment 3

[0072] The synthesis of water-soluble hyperbranched heavy oil viscosity reducer, its preferred scheme is as follows:

[0073] First, put a certain amount of deionized water into the reaction vessel, and mix 0.1% of functionalized backbone monomer 3.0 generation polyamidoamine, 13.8% of acrylamide, 38.5% of modified Nonylphenol polyoxyethylene ether maleic acid monoester (shown in formula 3, n is 10, m is 9) and 47.6% sodium olefin sulfonate monomer, mixed and stirred evenly, and prepared into a monomer concentration of 25%. Solution (mass fraction meter);

[0074] Secondly, the pH value of the solution was adjusted to 6.7 by adding sodium carbonate, and then under 45°C water bath heating and a stirring rate of 250r / min, the inert gas nitrogen was passed for protection for 40min; then the ammonium persulfate solution was slowly added dropwise, and the persulfate Ammonium persulfate in the ammonium solution is 0.018% relative to the total mass of the monomers. After continuing ...

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Abstract

The invention discloses a water-soluble hyperbranched polymer thick oil viscosity reducing agent and a preparation method thereof. The viscosity reducing agent is prepared by carrying out a free radical polymerization reaction on 0.1-0.5% of a functional framework monomer, 10-20% of acrylamide, 35-45% of modified nonionic polyoxyethylene ether and 40-50% of anionic monomer sodium olefinsulfonate in an aqueous solution at a temperature of 45-60 DEG C. The polymer thick oil viscosity reducing agent can be quickly dissolved in water, has high temperature resistance and salt resistance, and has good mixing and emulsifying performance with crude oil; the viscosity reducing rate of thick oil with medium and low viscosity is 85% or above; and an emulsion is broken easily. Meanwhile, raw materialsfor preparing the polymer thick oil viscosity reducing agent are wide in source, and the preparation process of the viscosity reducing agent is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of water-soluble polymer synthesis and heavy oil reservoir viscosity reduction, and specifically relates to a water-soluble hyperbranched polymer heavy oil viscosity reducer and a preparation method thereof. Background technique [0002] In recent years, with the increasing demand for energy around the world, there are fewer and fewer high-permeability conventional reservoirs that are easy to develop worldwide, and heavy oil reservoirs have attracted more and more attention from petroleum workers. In my country, the reservoirs with crude oil viscosity greater than 50 mPa·s under formation conditions are generally defined as heavy oil reservoirs. With the continuous exploitation of high-quality crude oil, the proportion of heavy oil in my country's resource composition is gradually increasing. and poor fluidity in the wellbore. If the colloids and asphaltenes can be effectively dispersed in the oil, the visc...

Claims

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Application Information

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IPC IPC(8): C08F283/04C08F283/06C08F220/56C08F228/02C08F2/10C09K8/524C09K8/584
CPCC08F2/10C08F283/045C08F283/065C09K8/524C09K8/584C08F220/56C08F228/02
Inventor 施雷庭刘义刚叶仲斌张健刘长龙华朝陈洪唐恩高韩玉贵兰夕堂
Owner CNOOC TIANJIN BRANCH
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