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Method for preparing amphiphilic macromolecule oil-displacing agent

A technology of amphiphilic polymers and oil displacement agents, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easy shear degradation of macromolecular chains, poor solubility of polymers, and easy adsorption on rock formations, etc. problem, to achieve a good solution viscosity increase effect, enhanced hydrophobic effect, good water solubility

Active Publication Date: 2012-06-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By increasing the content of hydrophobic groups on the polymer chain or increasing the molecular weight, it can resist the effects of high temperature and high salinity to a certain extent, but it may also lead to poor solubility of the polymer, a substantial increase in dissolution time, and easy shearing of the macromolecular chain. Problems such as degradation and easy adsorption to rock formations

Method used

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  • Method for preparing amphiphilic macromolecule oil-displacing agent
  • Method for preparing amphiphilic macromolecule oil-displacing agent
  • Method for preparing amphiphilic macromolecule oil-displacing agent

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] The chemical formula of the high steric hindrance monomer of the present embodiment is shown in formula (III):

[0034]

[0035] The high steric hindrance monomer is prepared by reacting acrylamide, concentrated sulfuric acid, acrylonitrile and diisobutylene in glacial acetic acid. For the specific preparation method, refer to Chinese patent document CN1891725A.

[0036] The chemical formula of the amphiphilic high surface active monomer of the present embodiment is shown in formula (IV):

[0037]

[0038]The specific preparation method is: add 18.6g lauryl alcohol and 0.6g KOH to the autoclave, purge and replace with nitrogen, then raise the temperature to 115-130°C, add 29.1g propylene oxide, and control the total pressure in the autoclave to 0.2-0.8MPa , The temperature is 135±5°C, after the pressure in the reactor drops, continue to react for 60 minutes. Then add 44.1g of ethylene oxide, control the pressure in the reactor to be lower than 0.8MPa, and continu...

Embodiment 2

[0041] Synthesis of the amphiphilic polymer oil displacing agent of this embodiment: add 100.00g acrylamide (AM), 1.28g high steric hindrance monomer (as shown in formula (III) in Example 1), 8.06g Amphiphilic high surface activity monomer (as shown in formula (IV) in embodiment 1), 10.23g sodium lauryl sulfate and 5.12g sodium nonylphenol polyoxyethylene ether sulfonate are together as surfactant and 408.92g distilled water Mix evenly; use NaOH solution to adjust the pH of the reaction system to 7; pass high-purity nitrogen into the solution system, adjust the system temperature to 10°C, add an initiator, and carry out polymerization for 4 hours; It was hydrolyzed at ℃ for 2 hours, dried and pulverized to obtain a powdery product amphiphilic polymer oil displacing agent.

Embodiment 3

[0043] Synthesis of the amphiphilic polymer oil displacement agent of this embodiment: add 100.00g acrylamide (AM), 2.05g high steric hindrance monomer (as shown in formula (III) in Example 1), 4.03g Amphiphilic high surface active monomer (as shown in formula (IV) in embodiment 1), 16.36g sodium lauryl sulfate and 8.18g sodium nonylphenol polyoxyethylene ether sulfonate as surfactant and 435.45g distilled Mix water together evenly; use NaOH solution to adjust the pH of the reaction system to 7.5; pass high-purity nitrogen into the solution system, adjust the system temperature to 10°C, add an initiator, and carry out polymerization for 5 hours; It was hydrolyzed at 85°C for 2 hours, dried and pulverized to obtain a powder product amphiphilic polymer oil displacing agent.

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Abstract

The invention relates to a method for preparing amphiphilic macromolecule oil-displacing agent, comprising the following steps: (1) uniformly mixing acrylamide, a monomer with high steric hindrance, an amphiphilic monomer with high surface activity, and surface active agents with water, wherein the molar ratio of the acrylamide, the monomer with high steric hindrance and the amphiphilic monomer with high surface activity is 100:(0.01-10):(0.02-5); (2) adjusting the pH of the mixture obtained from the step (1) to 6.5-8.0; (3) adding initiators into mixture in the step (2) to initiate a polymerization reaction; and (4) hydrolyzing a gel obtained from the polymerization reaction of the step (3) under alkaline conditions and then drying the hydrolysis product to obtain the amphiphilic macromolecule oil-displacing agent. The monomer with high steric hindrance and the amphiphilic monomer with high surface activity effectively improve the hydrophobic effect of macromolecules and increase theoil-water interfacial activity of macromolecules; the amphiphilic macromolecule oil-displacing agent has evident tackifying effect, and has better emulsifying and solubilizing effects on crude oil.

Description

technical field [0001] The invention relates to a preparation method of an amphiphilic polymer oil displacement agent. Background technique [0002] With the continuous increase of comprehensive water cut in oilfields, it is becoming more and more difficult to exploit and stabilize production in oilfields, and the requirements for polymer oil displacement agents for tertiary oil recovery are also increasing. The main function of the polymer used in tertiary oil recovery is to reduce the mobility ratio, adjust the water absorption profile by increasing the viscosity of the displacement fluid and reduce the water phase permeability of the oil layer, and enhance the oil recovery by increasing the sweep coefficient. The viscosity and viscosity stability of displacement fluid are important indicators to measure the effect of polymer flooding, and are the key issues affecting the effect of polymer flooding. The higher the viscosity of the polymer displacement fluid, the greater t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/38C09K8/588
Inventor 王金本史学峰徐晓慧周继柱王毅琳闫海科张健向问陶
Owner INST OF CHEM CHINESE ACAD OF SCI
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