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A kind of hydrophobically associative polymer and its preparation method and application

A hydrophobic association and polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems affecting the water solubility of copolymers, economic pressure, construction difficulties, etc., and increase the ability to resist divalent metal ions , high viscosity, good water solubility

Active Publication Date: 2018-10-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Firstly, due to the introduction of hydrophobic monomers, the water solubility of the copolymer is greatly affected, which brings economic pressure and construction difficulties to the oil field distribution site

Method used

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  • A kind of hydrophobically associative polymer and its preparation method and application
  • A kind of hydrophobically associative polymer and its preparation method and application
  • A kind of hydrophobically associative polymer and its preparation method and application

Examples

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preparation example Construction

[0027] The present invention also provides a method for preparing a hydrophobic association polymer, the method comprising: in the presence of an initiator and water as a solvent, monomer D, monomer E and monomer F undergo a 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). Based on the total weight of the monomer D, the monomer E and the monomer F, the amount of the monomer D is 4-50% by weight, and the amount of the monomer E is 40-95% by weight, the amount of the monomer F is 0.05-10% by weight; the conditions of the polymerization reaction are such that the viscosity-average molecular weight of the polymer obtained after the polymerization reaction is 15 million-30 million;

[0028]

[0029] Among them, R 1 , R 5 and R 6 Each is independently H or C1-C4 alkyl, R 2 C1-C4 alkylen...

Embodiment approach

[0047] According to a preferred embodiment of the present invention, the preparation method of the hydrophobic association type polymer may include the following steps:

[0048] (1) Under the condition that the pH value is 6-10, the monomer represented by the formula (4) and the monomer represented by the formula (5) are contacted with water, and nitrogen gas is blown in for 30 minutes to obtain a mixture solution;

[0049] (2) Under the protection of nitrogen, the mixture solution is contacted with the monomer represented by formula (6), a surfactant and an auxiliary agent, and mixed uniformly at 20-50° C. to obtain a micellar solution;

[0050] (3) Contacting the to-be-micellar solution with the initiator under the protection of nitrogen under the polymerization conditions, wherein the polymerization conditions are as follows: the polymerization temperature is 20-50°C; the polymerization time is 10-12h.

[0051] (4) After the polymerization reaction is completed, the obtaine...

Embodiment 1

[0061] This example is used to illustrate the hydrophobic association polymer and its preparation method provided by the present invention.

[0062] 1. Add 11.8g acrylamide (59% by mass ratio) and 8.0g 2-acrylamide-2-methylpropanesulfonic acid (40% by mass ratio) into a three-necked polymerization reaction bottle (ie, a polymerization bottle), Add 80.0 g of deionized water to dissolve to form an aqueous solution, then add sodium hydroxide to adjust the pH to 6.5, and blow nitrogen gas for 30 minutes;

[0063] 2. Under the protection of nitrogen, add 3.0g sodium lauryl sulfate, 0.2g hydrophobic monomer (n=1, mass ratio is 1%), 1.0g urea , placed in a 40°C water bath, stirred to disperse uniformly and form stable micelles;

[0064] 3. Under nitrogen protection, add 3.0 g of 0.1% potassium persulfate aqueous solution and 1.5 g of 0.1% sodium bisulfite aqueous solution, and maintain the polymerization reaction at 40° C. for 10 hours;

[0065] 4. After the polymerization is compl...

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Abstract

The invention discloses a hydrophobically associated polymer, and a preparation method and application thereof. The polymer contains a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit disclosed as Formula (1); the structural unit B is a structural unit disclosed as Formula (2); the structural unit C is a structural unit disclosed as Formula (3); and on the basis of the weight of the polymer, the content of the structural unit A is 4-50 wt%, the content of the structural unit B is 40-95 wt%, and the content of the structural unit C is 0.05-10 wt%. The viscosity-average molecular weight of the polymer is 15-30 million. The hydrophobically associated polymer disclosed by the invention has the advantages of favorable water solubility, high tackifying property, favorable temperature resistance, favorable salt resistance and favorable surface activity, and thus, has favorable displacement effect.

Description

technical field [0001] The invention relates to a hydrophobic association polymer and a preparation method, and the application of the hydrophobic association polymer as an oil displacement agent. Background technique [0002] Hydrophobic associative polymers refer to a class of water-soluble polymers obtained by introducing a small amount of hydrophobic structural units into the main chain of hydrophilic polymers by means of copolymerization or modification. This type of polymer has its unique solution properties , which is very different from conventional water-soluble polymers in terms of solution properties, has developed into one of the hotspots in the research of water-soluble polymer materials. [0003] Due to the small amount of hydrophobic units contained in the hydrophobic association polymer structure, the properties of the original polymer solution are greatly changed. In the dilute solution of the polymer, the intramolecular association occurs due to the hydrop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/54C08F2/26C09K8/588
Inventor 赵方园于芳杨捷王晓春
Owner CHINA PETROLEUM & CHEM CORP
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