Oil-soluble carbon quantum dots, nanofluid composition containing oil-soluble carbon quantum dots and method for inhibiting carbon dioxide flooding asphaltene deposition
A technology of carbon quantum dots and nanofluids, applied in the direction of drilling compositions, nanocarbons, chemical instruments and methods, etc., can solve the problems of rare inhibition and dispersion, achieve enhanced oil recovery and reduce reservoir damage , the effect of inhibiting aggregation
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[0057] According to a specific embodiment of the present invention, preferably, the present invention provides a preparation method of oil-soluble carbon quantum dots, which comprises the following steps:
[0058] S1, dissolve the nonionic surfactant in deionized water to obtain a nonionic surfactant solution; then mix the phosphoric acid and the nonionic surfactant solution uniformly to obtain a mixed solution; wherein, the nonionic surface The dosage ratio of the active agent to the deionized water is (100-200) mg: (10-50) mL; the dosage ratio of the non-ionic surfactant to the phosphoric acid is (100-200) mg: (10 ~50) mL;
[0059] S2. After the mixed solution obtained in step S1 is subjected to microwave irradiation at a power of 300 to 600 W for 3 to 20 minutes, a tan solution containing oil-soluble carbon quantum dots is obtained; the solution containing oil-soluble carbon quantum dots is cooled to room temperature;
[0060] S3, adding deionized water to the solution co...
Embodiment 1
[0065] The present embodiment provides an oil-soluble carbon quantum dot and a preparation method thereof, comprising the following steps:
[0066] S1. Weigh 180 mg of polyether F-68, add it to 15 mL of deionized water, and let it stand for 15 minutes at room temperature to fully dissolve to obtain an aqueous solution of polyether F-68; weigh 30 mL of phosphoric acid, add the polyether F-68 In the aqueous solution, stir evenly to obtain a mixed solution;
[0067] S2, place the mixed solution obtained in step S1 in a microwave oven, and irradiate it with a microwave power of 450W for about 9min to obtain a tan solution containing oil-soluble carbon quantum dots, which is taken out of the microwave oven and cooled to room temperature;
[0068] S3, adding 50 mL of deionized water to the solution containing oil-soluble carbon quantum dots obtained in step S2 to obtain a suspension containing a black-brown suspended precipitate, then adding 50 mL of toluene for extraction, using a ...
Embodiment 2
[0072] This embodiment provides a carbon quantum dot nanofluid composition, which is prepared according to the following steps:
[0073]Accurately weigh 0.02g of the oil-soluble carbon quantum dot black powder prepared in Example 1 of the present invention, and add it to 1L of the mixture of propylene glycol fatty acid ester and methyl myristate (the volume ratio of propylene glycol fatty acid ester and methyl myristate). In 3:7), use a magnetic stirring device at room temperature for 1 h at a speed of 800-1000 rpm to make it fully dispersed, then in a water bath at 25 °C with a power of 240W and a frequency of 40KHZ Ultrasonic for 2h, let stand In one night, the carbon quantum dot nanofluid composition was obtained.
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Abstract
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