Water-soluble hyperbranched multi-arm polyacrylamide polymer and preparation method thereof

A technology of polyacrylamide and acrylamide monomers, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of good viscosity, narrow distribution, large molecular weight, etc., and achieve the effect of mild preparation process conditions

Active Publication Date: 2015-09-02
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hyperbranched molecules currently prepared by methods such as ring-opening polymerization, reversible addition-fragmentation chain transfer polymerization, or atom chain transfer radical polymers are usually oil-soluble polyme...

Method used

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  • Water-soluble hyperbranched multi-arm polyacrylamide polymer and preparation method thereof
  • Water-soluble hyperbranched multi-arm polyacrylamide polymer and preparation method thereof
  • Water-soluble hyperbranched multi-arm polyacrylamide polymer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0053] Mix 25mg mother nucleus HCD, 95mL H2 O was placed in a three-necked flask, stirred and dissolved, and nitrogen gas was introduced to deoxygenate for 45 minutes, then an aqueous solution of ammonium cerium nitrate (60 mg of ammonium cerium nitrate dissolved in 10 mL of water) was added under the protection of nitrogen, and stirred for 30 minutes at 40 ° C. Slowly add acrylamide aqueous solution (8.0g acrylamide dissolved in 22mL water), acryloylethoxyphosphorylcholine monomer aqueous solution (300mg acryloylethoxyphosphorylcholine monomer dissolved in 3mL water), and then heat up to 55°C After reacting for 6 hours, add 1.2 g of NaOH to the reaction solution, hydrolyze at 120° C. for 2 hours, and dry to obtain 1# water-soluble hyperbranched multi-arm polymer.

Embodiment 2

[0055] 30mg mother nucleus HCD, 95mL H 2 O was placed in a three-necked flask, stirred and dissolved, and nitrogen gas was introduced to deoxygenate for 45 minutes, then an aqueous solution of ammonium cerium nitrate (60 mg of ammonium cerium nitrate dissolved in 10 mL of water) was added under the protection of nitrogen, and stirred for 30 minutes at 40 ° C. Slowly add acrylamide aqueous solution (8.0g acrylamide dissolved in 22mL water), acrylic acid carboxylic acid choline monomer aqueous solution (400mg acrylic acid carboxylic acid choline monomer dissolved in 3mL water), then raise the temperature to 55°C for 6h, and add to the reaction solution Add 1.2g NaOH to it, hydrolyze it at 120°C for 2 hours, and dry it to obtain 2# water-soluble hyperbranched multi-arm polymer.

[0056] The polymer performance evaluation method provided by the present invention and the results are as follows, wherein the unmodified partially hydrolyzed polyacrylamide (i.e. "common polymer") is an...

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Abstract

The invention provides a water-soluble hyperbranched multi-arm polyacrylamide polymer and a preparation method thereof. The polymer is composed of a spherical parent nucleus, an arm A and an arm B, wherein one end of the arm A is connected with the spherical parent nucleus, and the other end is connected with the arm B. The viscosity-average molecular weight of the polymer is 3.5-10 million, the mass ratio of the spherical parent nucleus to the arm A to the arm B is 1:(200-350):(7-18), and the degree of hydrolysis of the polymer is 20-40%. The spherical parent nucleus is polycyclodextrin with rich hydroxy groups at terminal groups. The arm A is an acrylamide-sodium acrylate random copolymer chain segment. The arm B is a poly-zwitterion choline functional chain segment. The preparation process of the water-soluble hyperbranched multi-arm polyacrylamide polymer is mild in conditions and simple and easy to implement, is green and pollution-free due to water-phase free-radical polymerization, and can not do harm to the human body. The water-soluble hyperbranched multi-arm polyacrylamide polymer has obviously higher tackifying property, salt resistance and shear resistance than the conventional linear polyacrylamide polymer, and has application prospects in oilfields.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a water-soluble hyperbranched multi-arm polyacrylamide polymer and a preparation method thereof. Background technique [0002] Polymer flooding technology is one of the main technical means to improve oil recovery in my country's oilfield development. Polymers are viscoelastic and have excellent viscosity-increasing ability to water, which can reduce the permeability of porous media to water and reduce the water permeability. Increase the oil mobility ratio, expand the sweep coefficient, and reduce the residual oil saturation, thereby enhancing oil recovery. At present, the most widely used polymer oil displacement agent is partially hydrolyzed polyacrylamide polymer or its modified products. However, polymers are subject to mechanical shear during formulation (stirrers), transport (pumps, pipelines, valves), injection (casing boreholes) and flow through porous media,...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F220/28C08F220/34C09K8/588
Inventor 陈文娟张健朱玥珺薛新生唐恩高檀国荣
Owner CHINA NAT OFFSHORE OIL CORP
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