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A kind of water-soluble hyperbranched polymer heavy oil viscosity reducer and preparation method thereof

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

Active Publication Date: 2021-09-21
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +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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  • A kind of water-soluble hyperbranched polymer heavy oil viscosity reducer and preparation method thereof
  • A kind of water-soluble hyperbranched polymer heavy oil viscosity reducer and preparation method thereof
  • A kind of water-soluble hyperbranched polymer heavy oil viscosity reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
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 heavy oil viscosity reducer and a preparation method thereof. The viscosity reducer is composed of 0.1%-0.5% functionalized skeleton monomer, 10%-20% acrylamide, 35%- 45% modified non-ionic polyoxyethylene ether and 40% to 50% anionic monomer olefin sulfonate are formed by free radical polymerization in an aqueous solution at 45°C to 60°C. This polymer thick oil viscosity reducer can be quickly dissolved in water, has strong temperature resistance and salt resistance, and has good emulsification performance when mixed with crude oil. The emulsification viscosity reduction rate of medium and low viscosity heavy oil is over 85%, and the emulsion is easy to break. . At the same time, the raw materials for the preparation of the polymer heavy oil viscosity reducer come from a wide range of sources, and the preparation process of the viscosity reducer is simple.

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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Patent Type & Authority Patents(China)
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 CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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