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A kind of water-soluble hyperbranched multi-arm polyacrylamide polymer and preparation method thereof

A technology of polyacrylamide and acrylamide monomer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc. It can solve the problems of good viscosification, impossibility of oil field oil displacement agent application, small molecular weight, etc., and meet the conditions of the preparation process mild effect

Active Publication Date: 2017-08-25
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 polymers with small molecular weight distributions and narrow
Therefore, it does not meet the requirements of good water solubility, high molecular weight, and good viscosity increasing, and cannot be used as an oil displacement agent in oil fields.

Method used

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  • A kind of water-soluble hyperbranched multi-arm polyacrylamide polymer and preparation method thereof
  • A kind of water-soluble hyperbranched multi-arm polyacrylamide polymer and preparation method thereof
  • A kind of water-soluble hyperbranched multi-arm polyacrylamide polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Combine 25mg mother core HCD, 95mL H 2 Put O in a three-necked flask, stir to dissolve, pour in nitrogen to deoxygenate for 45min, then add aqueous cerium ammonium nitrate solution (60mg cerium ammonium nitrate dissolved in 10mL water) under nitrogen protection, stir and react at 40℃ for 30min, add to the reaction solution in turn Slowly add acrylamide aqueous solution (8.0g acrylamide dissolved in 22mL water), acryloyl ethoxy phosphorylcholine monomer aqueous solution (300mg acrylamide ethoxy phosphorylcholine monomer dissolved in 3mL water), and then heat to 55℃ After reacting for 6 hours, 1.2g NaOH was added to the reaction solution, hydrolyzed at 120°C for 2 hours, and dried to obtain 1# water-soluble hyperbranched multi-arm polymer.

Embodiment 2

[0055] Put 30mg mother core HCD, 95mL H 2 Put O in a three-necked flask, stir to dissolve, pour in nitrogen to deoxygenate for 45min, then add aqueous cerium ammonium nitrate solution (60mg cerium ammonium nitrate dissolved in 10mL water) under nitrogen protection, stir and react at 40℃ for 30min, add to the reaction solution in turn 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), and then heat up to 55°C for 6h to react, and add to the reaction solution Add 1.2g of NaOH, hydrolyze at 120°C for 2 hours, and dry to obtain 2# water-soluble hyperbranched multi-arm polymer.

[0056] The performance evaluation method and results of the polymer provided by the present invention are as follows. Among them, the unmodified partially hydrolyzed polyacrylamide (ie "common polymer") is an industrialized product, and the pr...

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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 specifically 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. The polymer has viscoelasticity and excellent water viscosity increasing ability, which can reduce the permeability of porous media to water and reduce water The oil mobility ratio expands the sweep coefficient and reduces the residual oil saturation, thereby improving the oil recovery. Currently, the most widely used polymer oil-displacing agents are partially hydrolyzed polyacrylamide polymers or their modified products. However, polymers are subject to mechanical shear during preparation (agitator), transportation (pumps, pipelines, valves), injection (casing blastholes) and flowing through porous media. Especially, in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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