Modified graphene oxide, preparation method and applications thereof
A technology of oxidized stone and graphene, which is applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve problems such as increased water content, difficulty in reducing viscosity, and reduced oil recovery effect, so as to achieve lower interfacial tension and good emulsification effect, effect of good parental performance
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[0056] The purpose of the present invention is to provide a viscous-reducing modified graphene oxide oil displacement agent for ordinary heavy oil and a preparation method thereof, which can emulsify and reduce the viscosity of heavy oil, improve the oil quality of heavy oil, and effectively increase production and reduce consumption.
[0057] The invention provides a common heavy oil viscosity-reducing modified graphene oxide oil displacement agent and a preparation method thereof, comprising the following steps:
[0058] Step (1): Dilute the purchased graphene oxide with deionized water, and obtain graphene oxide with a smaller particle size after centrifugation by ultrasonic shearing;
[0059] Step (2) After diluting the graphene with a smaller particle size in step (1) again, take a certain amount and add the amphiphilic polymer, and continuously ultrasonically stir in a water bath;
[0060] Step (3) Add a certain amount of EDC / DMAP in step (2) as a carboxyl activator, mag...
Embodiment 1
[0076] The preparation of embodiment 1 modified graphene oxide
[0077] a) Dissolve graphene oxide in deionized water, prepare graphene oxide dispersion I with a concentration of 2mg / ml, and after ultrasonic shearing for 3h, centrifuge at 3000rpm for 10min to obtain graphene oxide with a particle size of 50-150nm ;
[0078] b) Dilute the obtained 50 mg graphene oxide with deionized water to obtain graphene oxide dispersion II with a concentration of 1 mg / ml, add 0.5 g rhamnolipid, and ultrasonically stir in a water bath for 30 minutes to obtain graphene oxide and amphiphilic A mixture of polymer rhamnolipids;
[0079] c) Add carboxyl activator 0.25g EDC and 0.05g DMAP to the mixture, stir at 20°C for 3h, and ultrasonicate in a water bath for 30min to obtain a dispersion containing modified graphene oxide, which is designated as sample 1#.
[0080] The graphene oxide obtained in step a) of the present embodiment is subjected to a morphology test, figure 1 for its AFM map, gi...
Embodiment 2
[0081] The preparation of embodiment 2 modified graphene oxide
[0082] a) Dissolve graphene oxide in deionized water, prepare graphene oxide dispersion I with a concentration of 2.5 mg / ml, and after ultrasonic shearing for 4 hours, centrifuge at a speed of 4000 rpm for 20 minutes to obtain graphite oxide with a particle size of 50-150 nm alkene;
[0083] b) Dilute the obtained 75 mg graphene oxide with deionized water to obtain graphene oxide dispersion II with a concentration of 1 mg / ml, add 0.75 g of F108, and ultrasonically stir in a water bath for 45 minutes to obtain graphene oxide and amphiphilic polymer F108 mixture;
[0084] c) Add carboxyl activator 0.4g EDC and 0.08g DMAP to the mixture, stir at 25°C for 4h, and ultrasonicate in a water bath for 45min to obtain a dispersion containing modified graphene oxide, which is designated as sample 2#.
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Abstract
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