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

Pending Publication Date: 2022-07-15

CHINA UNIV OF PETROLEUM (BEIJING)

0 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] Due to their unique physical and chemical properties, carbon nanomaterials have received more and more attention in the field of enhanced o...

Abstract

The invention provides an oil-soluble carbon quantum dot, a nanofluid composition containing the oil-soluble carbon quantum dot and a method for inhibiting carbon dioxide flooding asphaltene deposition. The preparation method of the oil-soluble carbon quantum dot provided by the invention comprises the step of performing microwave radiation on a mixed solution of a nonionic surfactant and phosphoric acid to obtain the oil-soluble carbon quantum dot. The carbon quantum dot nanofluid composition provided by the invention contains the oil-soluble carbon quantum dot. The method for inhibiting asphaltene deposition in the carbon dioxide flooding process by adopting the carbon quantum dot nanofluid composition comprises the following step: injecting the carbon quantum dot nanofluid composition into a carbon dioxide flooding oil reservoir. The oil-soluble carbon quantum dots and the carbon quantum dot nanofluid composition provided by the invention can effectively inhibit asphaltene deposition in a carbon dioxide flooding process, reduce reservoir damage and improve the crude oil recovery rate.

Application Domain

Material nanotechnologyNanooptics +4

Technology Topic

NanofluidCarbon dioxide flooding +13

Image

Examples

Experimental program(4)
Effect test(3)

Example Embodiment

[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 containing oil-soluble carbon quantum dots obtained in step S2 to obtain a suspension containing a black-brown suspended precipitate, then adding an extractant, at 20-25 ° C at 800-1000 rpm/ After stirring for 1 to 2 hours at a different rotational speed, the upper layer liquid is taken and filtered to obtain a purified solution containing oil-soluble carbon quantum dots; wherein, the volume ratio of the added deionized water to the deionized water used in step S1 is (3-6): 1, and the volume ratio of the amount of the added extractant to the deionized water added in step S3 is (1-3): 1;

[0061] S4. Under the conditions of a temperature of 80 to 100° C. and a vacuum of 0.7 to 0.9 MPa, the purified oil-soluble carbon quantum dot-containing solution obtained in step S3 is concentrated by rotary evaporation, crystallized and dried to obtain a solid The oil-soluble carbon quantum dots.

Example Embodiment

[0064] Example 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 magnetic stirring device at room temperature with Stirring at 800-1000 rpm for 2 hours, then take the upper layer liquid for filtration to obtain oil-soluble carbon quantum dots-toluene solution;

[0069] S4, the oil-soluble carbon quantum dots-toluene solution obtained in step S3 is placed in a rotary evaporator, and rotary evaporation is carried out under the conditions that the temperature is 90 ° C and the vacuum degree is 0.8 MPa, and then the concentrated concentrated solution is evaporated. The oil-soluble carbon quantum dots are obtained as black powder after evaporating and crystallizing in a pan, and then drying.

[0070] figure 1 Transmission electron microscope (TEM) image of the oil-soluble carbon quantum dots prepared in this example. figure 2 The particle size distribution diagram of the oil-soluble carbon quantum dots prepared in this example. like figure 1 and figure 2 As shown, the oil-soluble carbon quantum dots prepared in this example have obvious spherical or ellipsoidal shape, the size distribution is 0.5-4 nm, the average particle size is 2.3 nm, the structure is complete, the particle size is uniform, and the dispersibility is good. image 3 The contact angle image of the oil-soluble carbon quantum dots prepared in this example. like image 3 As shown, the oil-soluble carbon quantum dots in this embodiment can increase the water contact angle of a conventional hydrophilic glass cover glass from 42.541° to 86.991°, and the water droplets are transformed from spreading to spherical, with good hydrophobicity.

Example Embodiment

[0071] Example 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.

PUM

Property	Measurement	Unit
Size	0.5 ~ 4.0	nm
The average particle size	2.3	nm
Particle size	400.0 ~ 3000.0	nm

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Classification and recommendation of technical efficacy words

Good compatibility

Oil-soluble carbon quantum dots, nanofluid composition containing oil-soluble carbon quantum dots and method for inhibiting carbon dioxide flooding asphaltene deposition

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Polypropylene/polystyrene alloy and method of producing the same

Argentine-loaded hydroxylapatite and preparation method thereof

Heatproof antifouling superhigh voltage insulation material and preparation method thereof

High-strength wear-resistant flame-retardant modified natural rubber composite

Preparation method of permanently-antibacterial poly guanidine alginate fibers

Classification and recommendation of technical efficacy words

Pure natural component lip gloss

SIP soft switching system supporting P2P media transmission and its implementation method

Capacitor structure

Composite interior material for motor car and preparation method thereof

Energy-saving insulated flame-retardant water-proof corrosion-proof functional coating and preparation method thereof