Sulfonate betaine type acrylamide copolymer oil displacement agent and synthesis method thereof

A technology of methacrylamide and betaine, which is applied in the direction of sulfonate preparation, chemical instruments and methods, and drilling compositions, etc., can solve the problems of low yield, complex preparation process of oil displacement agent, and high cost. Achieve the effects of simple preparation process, enhanced oil recovery and low cost

Inactive Publication Date: 2016-06-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Another object of the present invention is to provide a synthetic method of sulfonate-containing betaine type acrylamide copolymer oil displacement agent, which solves the problems of complex preparation process, low yield and high cost of existing oil displacement agents

Method used

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  • Sulfonate betaine type acrylamide copolymer oil displacement agent and synthesis method thereof
  • Sulfonate betaine type acrylamide copolymer oil displacement agent and synthesis method thereof
  • Sulfonate betaine type acrylamide copolymer oil displacement agent and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Example 1: Synthesis of sodium 3-(3-methylacrylamido-1-dimethylaminopropyl)-2-hydroxypropyl sulfonate

[0044] (1) Add 0.12mol sodium bisulfite and 100mL deionized water into a 250mL three-necked flask, stir to dissolve;

[0045] (2) Heat to 85°C, slowly add 0.1 mol epichlorohydrin dropwise, and react for 3.5 hours after the dropwise addition is complete;

[0046] (3) After the reaction, cool to room temperature, filter with suction, and recrystallize the solid with deionized water three times to obtain a white solid of sodium 3-chloro-2-hydroxy-propanesulfonate;

[0047] (4) Dissolve N-dimethylaminopropyl methacrylamide in a 70% ethanol solution, and slowly add dropwise the aqueous solution of sodium 3-chloro-2-hydroxy-propanesulfonate prepared above, N-dimethylamino The molar ratio of propylmethacrylamide to sodium 3-chloro-2-hydroxy-propanesulfonate is 1.2:1;

[0048] (5) Heat to 70°C and react for 6-8 hours;

[0049] (6) After the reaction is completed, cooling, rotary evapor...

Embodiment 2

[0050] Example 2: Structural characterization of sodium 3-(3-methylacrylamido-1-dimethylaminopropyl)-2-hydroxypropyl sulfonate

[0051] The infrared spectrum of 3-(3-methylacrylamido-1-dimethylaminopropyl)-2-hydroxypropyl sulfonate synthesized by implementation example 1 is as follows figure 1 Shown. by figure 1 It can be seen that 3586cm -1 And 3520cm -1 O-H stretching vibration peak at the place; 3356cm -1 Amide N-H stretching vibration peak at the place; 2958cm -1 And 2923cm -1 At -CH 3 And -CH 2 Stretching vibration peak; 1724cm -1 Where is the amide C=O stretching vibration peak; 1627cm -1 C=C stretching vibration peak; 1418cm -1 And 1341cm -1 At -CH 3 And -CH 2 Flexural vibration peak; 1295cm -1 C-N stretching vibration peak in ammonium; 1178cm -1 And 1050cm -1 At-SO 3 - S=O, S-O in - Stretching vibration peak; 729cm -1 At -CH 2 -Stretching vibration peak.

Embodiment 3

[0052] Implementation example 3: Synthesis of copolymer oil-displacing agent AM / DMEA / MPAS

[0053] (1) Put AA, MPAS, and DMEA into a 250 mL three-neck flask according to the monomer mass feed ratio, add an appropriate amount of deionized water, and adjust the total monomer concentration to 25 wt%. Under the condition of 300-400rpm, stir for 10min to make the system evenly dispersed;

[0054] (2) Blow in nitrogen at 40°C for 30 minutes, then add the initiators ammonium persulfate and sodium bisulfite (the molar ratio of ammonium persulfate and sodium bisulfite is 1:1), and the amount of initiator added is the total monomer 0.4% of quality;

[0055] (3) At a reaction temperature of 40°C, nitrogen gas is introduced for 10-20 minutes, and the reaction is continued for 8 hours;

[0056] (4) After the reaction is completed, the reaction product is washed three times with absolute ethanol, pulverized, and dried to prepare the AM / DMEA / MPAS terpolymer.

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Abstract

The invention relates to a sulfonate betaine type acrylamide copolymer oil displacement agent and a synthesis method thereof.The copolymer oil displacement agent is formed by synthesizing three monomers of acrylamide (AM), N,N-dimethylaminoethyl acrylate (DMEA) and 3-(3-methacrylamide-1-dimethylamino propyl)-2-hydroxy propyl sulfonic acid (MPAS).The mass charge rate of AM to MPAS to DMEA is 94.90:5.00:0.1.The invention provides sulfonate betaine and a preparation method of a copolymer of the sulfonate betaine.Sulfonic acid groups, N+ groups and ester structures are introduced to polymer molecular chains, the viscosity, viscoelasticity and shearing resistance of the polymer are enhanced, and heat resistance and salt tolerance of the polymer are improved.A good effect is achieved by a laboratory simulation oil displacement experiment, operation is easy and convenient, the yield is high, cost is low, and good application prospects are achieved.

Description

Technical field [0001] The invention relates to a method for synthesizing a sulfonate betaine type acrylamide copolymer oil-displacing agent capable of improving oilfield recovery technical background [0002] With the continuous development of oil reservoirs all over the world, the quality of the oil reservoirs is becoming more and more demanding. Conventional mining methods can no longer meet the needs of production, and chemical flooding is playing an increasingly important role in oil reservoir development. [0003] Polymer flooding is one of the more important types of chemical flooding. It refers to the method of adding a small amount of high molecular weight soluble polymer to water, increasing the viscosity of the solution, reducing the mobility ratio, and increasing the sweep coefficient to improve the recovery factor (WeverDAZ ,PicchioniF,BroekhuisAA.Polymersforenhancedoilrecovery:aparadigmforstructure–propertyrelationshipinaqueoussolution[J].ProgressinPolymerScience,2011...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/14C07C303/32C07C309/08C09K8/584C09K8/588C08F220/56C08F220/60C08F220/34
CPCC07C303/32C07C309/14C08F220/56C09K8/584C09K8/882C07C309/08C08F220/606C08F220/34
Inventor 苟绍华张勤何杨马永涛李世伟周艳婷李青
Owner SOUTHWEST PETROLEUM UNIV
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