Nano composite core-shell particle oil-displacing agent and preparation method and application thereof

A nano-composite, oil-displacing agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of large amount of surfactant used, increased oil recovery cost, large adsorption loss, etc., to improve temperature and resistance Salinity, reduce the cost of oil displacement, and reduce the effect of loss

Active Publication Date: 2017-04-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of surfactant used is large, and the adsorption loss in the formation is large, thereby increasing the cost of oil recovery, and the economic benefit is low

Method used

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  • Nano composite core-shell particle oil-displacing agent and preparation method and application thereof
  • Nano composite core-shell particle oil-displacing agent and preparation method and application thereof
  • Nano composite core-shell particle oil-displacing agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Preparation of layered silicate loaded with oil displacement surfactant

[0044] a. Mix montmorillonite and water in a reaction kettle at a ratio of 1:20 by mass, and stir at room temperature for 30 minutes to form a swelling system;

[0045] b. The temperature of the above-mentioned swelling system was raised to 80° C., and 20% cetyltrimethylammonium bromide was added based on the mass of montmorillonite, the frequency of the mixer was set to 30 Hz, and the stirring reaction was carried out for 6 hours;

[0046] c. based on the quality of montmorillonite, add 20% 3-sulfopropyl hexadecyl dimethyl betaine (industrial product) to the reaction system obtained above, continue to react for 4h, and obtain the oil displacement surfactant of load layered silicate slurry;

[0047] d. Suction filtration, drying, grinding, and sieving of the above slurry to obtain layered silicate powder loaded with oil displacement surfactant, which is ready for use.

[0048] The prep...

Embodiment 2

[0053] Example 2 Preparation of Layered Silicate Loaded Oil Displacement Surfactant

[0054] a. Mix montmorillonite and water in a reaction kettle at a ratio of 1:20 by mass, and stir at room temperature for 30 minutes to form a swelling system;

[0055] b. The temperature of the above swelling system was raised to 80°C, 20% cetyltrimethylammonium chloride was added based on the mass of montmorillonite, the frequency of the mixer was set to 30Hz, and the stirring reaction was carried out for 6h;

[0056] c. based on the quality of montmorillonite, add 20% 3-sulfopropyl hexadecyl dimethyl betaine (industrial product) to the reaction system obtained above, continue to react for 4h, and obtain the oil displacement surfactant of load layered silicate slurry;

[0057] d. Suction filtration, drying, grinding, and sieving of the above slurry to obtain layered silicate powder loaded with oil displacement surfactant, which is ready for use.

[0058] After detection, the interlayer sp...

Embodiment 3

[0059] Example 3 Preparation of Layered Silicate Loaded Oil Displacement Surfactant

[0060] a. Mix kaolin and water in a reaction kettle at a ratio of 1:20 by mass, and stir at room temperature for 30 minutes to form a swelling system;

[0061] b. Heat up the swelling system to 80°C, add 20% cetyltrimethylammonium bromide based on the mass of kaolin, set the mixer frequency to 30Hz, and stir for 8 hours;

[0062] c. Based on the quality of kaolin, add 20% 3-sulfopropyl hexadecyl dimethyl betaine (industrial product) to the reaction system obtained above, and continue to react for 6h to obtain a layered surface active agent loaded with oil displacement Silicate slurry;

[0063] d. Suction filtration, drying, grinding, and sieving of the above slurry to obtain layered silicate powder loaded with oil displacement surfactant, which is ready for use.

[0064] After detection, the interlayer spacing of the layered silicate loaded with the oil displacement surfactant is 2.17nm.

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Abstract

The invention provides a nano composite core-shell particle oil-displacing agent and a preparation method and an application thereof. The preparation method for the nano composite core-shell particle oil-displacing agent comprises the following steps: 1) mixing an acrylamide monomer with deionized water, then adding a crosslinking agent, and stirring, to obtain an acrylamide aqueous-phase system; 2) mixing the emulsifier with an organic solvent, then loading an oil-displacing surfactant layered silicate, and stirring to obtain an oil-phase system; and 3) under a protection atmosphere and stirring, slowly adding the oil-phase system to the acrylamide aqueous-phase system, then adding an initiator, carrying out a polymerization reaction, and after the completion of the reaction, demulsifying, filtering, and drying to obtain the nano composite core-shell particle oil-displacing agent. The nano composite core-shell particle oil-displacing agent can form ultra low interfacial tension with crude oil, and greatly improves the recovery ratio of petroleum; in addition, in the oil-displacing process, the oil-displacing agent is not easily adsorbed and eluted, the surfactant loss is low, and thus the oil production cost is facilitated to be reduced.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a nanocomposite core-shell particle oil displacement agent and its preparation method and application. Background technique [0002] Oil extraction is usually divided into primary oil recovery and secondary oil recovery. The primary oil recovery is to use the pressure of the oilfield itself to spray oil, which can recover about 20% of the original geological reserves. As the formation pressure decreases, the output of primary oil recovery decreases. At this time, secondary oil recovery can be used, that is, water injection into the formation to increase the pressure to increase oil production. Secondary oil recovery can further recover about 20% of the reserves. The total recovery rate of the above-mentioned conventional oil recovery technology is only about 40%, and about 60% of the crude oil remains underground. [0003] At present, my country's Daq...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/584C09K8/58
CPCC09K8/58C09K8/584C09K8/588
Inventor 柯扬船张维
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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