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Polymer with surface active function and its preparation method and application

A surface-active, polymer technology, used in drilling compositions, chemical instruments and methods, etc., can solve problems such as easy degradation and poor salt resistance

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main application in polymer flooding is partially hydrolyzed polyacrylamide, which has the characteristics of high molecular weight and good water solubility. However, under the conditions of high temperature and high salt reservoirs, partially hydrolyzed polyacrylamide has obvious defects in performance, such as resistance Temperature, poor salt resistance, easy to degrade, etc.

Method used

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  • Polymer with surface active function and its preparation method and application
  • Polymer with surface active function and its preparation method and application
  • Polymer with surface active function and its preparation method and application

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preparation example Construction

[0034] In a second aspect, the present invention provides a method for preparing a polymer having surface-active functions, wherein the method comprises: in the presence of an initiator and water as a solvent, making monomer D, monomer E and monomer F is subjected to a solution polymerization reaction, wherein the monomer D is a monomer having a structure shown in formula (4), the monomer E is a monomer having a structure shown in formula (5), and the monomer F is A monomer having a structure shown in formula (6), wherein, the amount of the monomer D, the monomer E and the monomer F makes the content of the structural unit A in the prepared polymer be 55-89.9% by weight, and the structural unit The content of B is 10-40% by weight, the content of structural unit C is 0.1-5% by weight, and the viscosity-average molecular weight of the prepared polymer is 27 million-31.5 million; the structural unit A has the formula (1 ), the structural unit B is a structural unit with a struct...

specific Embodiment approach

[0057] According to a preferred embodiment, the preparation method of the polymer with surface active function comprises the following steps:

[0058] Step 1: Add monomer D, monomer E and monomer F into a preparation bottle to prepare an aqueous solution, and adjust the pH of the aqueous solution to 6-10 with alkali;

[0059] Step 2: Add complexing agent, aqueous urea solution and chain extender (tetramethylethylenediamine) to the aqueous solution of step 1, and stir evenly;

[0060] Step 3: Place the above aqueous solution in a water bath of a refrigerator for cooling until the temperature drops to 10-20°C;

[0061] Step 4: Transfer the above-mentioned cooled aqueous solution to a Dewar bottle (polymerization bottle), blow in nitrogen for 20-40 minutes, and after blowing in nitrogen to make it evenly mixed, add the initiator to the aqueous solution in step 2 , seal after initiation of polymerization, rely on system polymerization to release heat, automatically heat up to 70-90...

Embodiment 1

[0074] This example is used to illustrate the polymer with surface active function provided by the present invention and its preparation method.

[0075] (1) Acrylamide shown in 11.8g formula (13) (accounting for 59% by weight of the total amount of monomers), 2-acrylamido-2-methylpropanesulfonate sodium shown in 8.0g formula (14) (accounting for 40% by weight of the total amount of monomers) and the functional monomer shown in 0.2g formula (15) (R 6 for H, R 7 for SO 3 Na, m is 10, n is 8, accounts for 1% by weight of the total amount of monomers) joins in the preparation bottle, adds deionized water 60.0g to dissolve and is made into aqueous solution, then adds solid sodium hydroxide to adjust pH to be 6.0, obtains mixture solution;

[0076] (2) Add 1.0 g of 1% by weight of EDTA-2Na aqueous solution (accounting for 0.05% by weight of the total monomer amount) and 0.5 g of 1% by weight of urea aqueous solution (accounting for 0.025% by weight of the total amount of monomer...

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Abstract

The invention relates to the field of crude oil recovery, and discloses a polymer with surface active function, its preparation method and application. The polymer contains structural unit A, structural unit B and structural unit C, wherein structural unit A is a structural unit of formula (1), structural unit B is a structural unit of formula (2), and structural unit C is a structural unit of formula (3) The structural unit; the viscosity-average molecular weight of the polymer is 27 million-31.5 million. The present invention introduces a functional monomer with both surface activity and polymerizable acrylamide into the acrylamide copolymer, so as to improve the surface activity, viscosity increase and temperature and salt resistance of the polyacrylamide solution.

Description

technical field [0001] The invention relates to the research field of water-soluble polymers with surface active functions and polymers for oil displacement to enhance oil recovery, in particular to a polymer with surface active functions and its preparation method and application. Background technique [0002] At present, most of my country's oilfields have entered the middle and late stages of production, and tertiary oil recovery has become an important measure to enhance oil recovery and maintain oilfield production. At the same time, polymer flooding occupies a very important position in tertiary oil recovery. The main application in polymer flooding is partially hydrolyzed polyacrylamide, which has the characteristics of high molecular weight and good water solubility. However, under the conditions of high temperature and high salt reservoirs, partially hydrolyzed polyacrylamide has obvious defects in performance, such as resistance Temperature, poor salt resistance, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C09K8/584
Inventor 赵方园杨捷王晓春
Owner CHINA PETROLEUM & CHEM CORP
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