Acrylamide copolymer, preparation method and applications thereof

A technology of acrylamide copolymer and polymerization reaction, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of complex oil-water relationship and poor effect, and achieve high surface/interface activity, excellent viscosity increase, solubility The effect of speed resistance to high temperature and high salt

Active Publication Date: 2020-02-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to severe water flooding of oil wells and complex oil-water relationship in the ultra-high water cut stage, traditional water plugging and profile control agents such as pre-crosslinked gel particles and clay gel polymer flocculation systems are difficult to achieve deep control and displacement under the reservoir. lead to poor on-site implementation

Method used

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  • Acrylamide copolymer, preparation method and applications thereof
  • Acrylamide copolymer, preparation method and applications thereof
  • Acrylamide copolymer, preparation method and applications thereof

Examples

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preparation example Construction

[0015] According to the first aspect of the present invention, the present invention provides a method for preparing an acrylamide copolymer, the preparation method comprising: under solution polymerization conditions, in the presence of an initiator and a surfactant, acrylamide, A monomer mixture consisting of comonomers and reactive monomers is polymerized in water.

[0016] In the present invention, the structure of the comonomer is as shown in formula (1), and the structure of the active monomer is as shown in formula (2); the initiator includes initiator A and initiator B, and the The structure of initiator A is as shown in formula (3), and described initiator B is 4-methylthiosemicarbazide;

[0017]

[0018] Among them, R 1 -R 3 and R 5 each independently hydrogen or C1-C4 alkyl, R 4 For C1-C4 alkylene, M is hydrogen, sodium or potassium; R 6 -R 9 Each is independently a C1-C4 alkyl group, n is an integer of 1-10, and m is an integer of 2-6.

[0019] In the pre...

Embodiment approach

[0041] According to a more specific preferred embodiment, the preparation method of the acrylamide copolymer comprises the following steps:

[0042] 1) Add acrylamide, comonomer and water into a three-necked flask (hereinafter also referred to as a polymerization bottle) to form an aqueous solution, adjust the pH of the aqueous solution to 6-10 with alkali, and blow nitrogen gas for 20-60 minutes to remove oxygen;

[0043] 2) Under the protection of nitrogen, add the surfactant, the complexing agent aqueous solution, the other auxiliary agents and the active monomer into the aqueous solution, place in a water bath at 25-40°C, stir and disperse evenly, Form stable micelles;

[0044] 3) Under the protection of nitrogen, add initiator A and initiator B to the reaction system of step 2) at a temperature of 25-40°C until the solution becomes thick, that is, the polymerization reaction starts, and the reaction is maintained for 6-8 hour; then the reaction was heated up to 60-70°C, ...

Embodiment 1

[0061] This example is used to illustrate the acrylamide copolymer of the present invention and its preparation method.

[0062] 1) Add 11.8g of acrylamide, 8.0g of 2-acrylamido-2-methylpropanesulfonic acid and 60.0g of deionized water into the polymerization bottle to dissolve the monomer to obtain an aqueous solution of the monomer mixture, which is then oxidized with hydrogen Adjust the pH to 6.0 with sodium, and blow nitrogen gas for 30 minutes;

[0063] 2) under nitrogen protection, add 0.2g sodium lauryl sulfate, 0.2g active monomer (R 5 is methyl, n=1), 0.2g urea and 1.0g EDTA-2Na aqueous solution, put the polymerization bottle in a 25°C water bath, stir and disperse to form stable micelles;

[0064] 3) Under nitrogen protection, at 25°C, add 0.01g of N,N,N',N'-tetramethylethylenediamine and 0.002g of 4-methylthiosemicarbazide to the polymerization bottle to initiate the monomer mixture Polymerize and react for 6 hours, then raise the temperature to 60°C to continue t...

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Abstract

The invention relates to the technical field of oilfield water injection, and discloses an acrylamide copolymer, a preparation method and applications thereof. The preparation method comprises: underthe condition of a solution polymerization reaction, in the presence of an initiator and a surfactant, carrying out a polymerization reaction on acrylamide and a monomer mixture comprising a comonomerwith a structure represented by a formula (1) and an active monomer with a structure represented by a formula (2) in water, wherein the initiator comprises an initiator A with a structure representedby a formula (3) and an initiator B, the initiator B is 4-methylthiosemicarbazide, R1-R3 and R5 are respectively selected from hydrogen and C1-C4 alkyl, R4 is C1-C4 alkylene, M is hydrogen, sodium orpotassium, R6-R9 are respectively C1-C4 alkyl, n is an integer of 1-10, and m is an integer of 2-6. According to the invention, the prepared acrylamide copolymer has advantages of ultrahigh molecularweight tackifying property, excellent solubility, excellent temperature resistance, excellent salt resistance and favorable surface / interface activity.

Description

technical field [0001] The invention relates to the technical field of oilfield water injection, in particular to an acrylamide copolymer and its preparation method and application. Background technique [0002] In the process of oilfield water injection development, due to the existence of formation heterogeneity, the injected water will rush along the high permeability layer, resulting in an increase in the water production rate of the oil well year by year. Profile control of water injection wells and water plugging of oil wells have become important measures to stabilize and increase production in oil fields. However, with the increase of rounds of conventional plugging control systems and measures, the remaining oil saturation in the near-wellbore area has dropped significantly, and the oil increase effect has become worse. Only through deep plugging control can more effectively adjust and improve reservoir heterogeneity , so as to increase the swept volume and sweep c...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F220/54C09K8/508
CPCC08F220/56C09K8/5083
Inventor 赵方园杨捷王晓春
Owner CHINA PETROLEUM & CHEM CORP
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