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A carbon dioxide foam system added with hydrophilic nanoparticles for oil displacement and its preparation method

A nanoparticle, carbon dioxide technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of high cost of hydrophobic nanoparticles, poor dispersion stability of foaming agent solution, and difficulty in dispersion, etc., and achieves the preparation method. And the on-site construction process is simple, easy to popularize and apply, and the cost is low.

Active Publication Date: 2018-04-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of hydrophobic nanoparticles is high, and due to the strong degree of hydrophobicity, it is difficult to disperse in water, and the dispersion stability of the prepared foaming agent solution is poor. Therefore, it may face many construction technology problems in oilfield field applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A carbon dioxide foam system added with hydrophilic nanoparticles, comprising the following components by mass of raw materials:

[0035] Lauryl alcohol polyoxyethylene polyoxypropylene ether (C 12 E. 9 P 3 ) 0.15g, hydrophilic silica nanoparticles (average particle diameter 16nm, surface silanol density 1.5 / nm 2 , the contact angle with water is 38.8°) 1.5g, sodium chloride (NaCl) 0.2g, carbon dioxide 0.5g, distilled water 100g.

[0036] The preparation method is as follows:

[0037] (1) Add hydrophilic silica nanoparticles into distilled water and stir evenly, then add lauryl alcohol polyoxyethylene polyoxypropylene ether (C 12 E. 9 P 3 ) and sodium chloride (NaCl), use an ultrasonic disperser to ultrasonically disperse the mixed system for 3 minutes;

[0038] (2) Use the Waring Blender method to generate foam: continuously inject carbon dioxide into the system obtained in step (1) for 3 minutes, and then stir the system at a speed of 8000 r / min for 3 minutes t...

Embodiment 2

[0041]A carbon dioxide foam system added with hydrophilic nanoparticles, comprising the following components by mass of raw materials:

[0042] Lauryl alcohol polyoxyethylene polyoxypropylene ether (C 12 E. 9 P 3 ) 0.1g, hydrophilic silica nanoparticles (average particle diameter 20nm, surface silanol density 1 / nm 2 , the contact angle with water is 50.4°) 1.5g, sodium chloride (NaCl) 0.2g, carbon dioxide 0.5g, distilled water 100g.

[0043] The preparation method is as follows:

[0044] (1) Add hydrophilic silica nanoparticles into distilled water and stir evenly, then add lauryl alcohol polyoxyethylene polyoxypropylene ether (C 12 E. 9 P 3 ) and sodium chloride (NaCl), use an ultrasonic disperser to ultrasonically disperse the mixed system for 3 minutes;

[0045] (2) Use the Waring Blender method to generate foam: continuously inject carbon dioxide into the system obtained in step (1) for 3 minutes, and then stir the system at a speed of 8000 r / min for 3 minutes to ob...

Embodiment 3

[0048] A carbon dioxide foam system added with hydrophilic nanoparticles, comprising the following components by mass of raw materials:

[0049] Lauryl alcohol polyoxyethylene polyoxypropylene ether (C 12 E. 9 P 3 ) 0.1g, hydrophilic silica nanoparticles (average particle diameter 20nm, surface silanol density 1 / nm 2 , the contact angle with water is 50.4°) 1.5g, sodium chloride (NaCl) 0.2g, carbon dioxide 0.5g, distilled water 100g.

[0050] The preparation method is as follows:

[0051] (1) Add hydrophilic silica nanoparticles into distilled water and stir evenly, then add lauryl alcohol polyoxyethylene polyoxypropylene ether (C 12 E. 9 P 3 ) and sodium chloride (NaCl), use an ultrasonic disperser to ultrasonically disperse the mixed system for 3 minutes;

[0052] (2) Place the mixed system in an incubator at 80°C and keep the temperature constant for 3 hours;

[0053] (3) Use the Waring Blender method to generate foam: continuously feed carbon dioxide into the syste...

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Abstract

The invention relates to a carbon dioxide foam system added with hydrophilic nano particles for oil displacement and a preparation method thereof. The carbon dioxide foam system has the following components by mass: 0.1-0.3 parts of nonionic surfactant, 1-2 parts of hydrophilic nanoparticles, 0.01-0.2 parts of inorganic salts, 0.2-0.8 parts of carbon dioxide, and 100 parts of water. Prepare the foaming agent system in proportion and disperse evenly with an ultrasonic disperser. Put carbon dioxide into the mixing cup and stir using the Waring Blender method. Compared with the carbon dioxide foam produced by ordinary surfactants, the carbon dioxide foam added with hydrophilic nanoparticles has better heat and salt resistance, and it is cheaper and more stable than the foaming agent added with hydrophobic nanoparticles. It is easier to be used in the oil field Promote apps.

Description

technical field [0001] The invention relates to a carbon dioxide foam system added with hydrophilic nanoparticles and a preparation method thereof, belonging to the technical field of oil and gas field development engineering. Background technique [0002] The combustion of fossil fuels will produce a large amount of carbon dioxide gas, and the random emission of carbon dioxide will lead to the greenhouse effect and endanger the climate security of mankind. As people's requirements for carbon dioxide emission reduction are increasing day by day, more and more attention has been paid to the storage and utilization technology of carbon dioxide. [0003] Carbon dioxide and crude oil in the formation can interact to reduce the viscosity of crude oil and increase the elastic energy of crude oil. Compared with nitrogen, air and methane gas, the miscibility pressure of carbon dioxide and crude oil is low, which is a kind of oilfield development field. Ideal oil displacing agent. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594
CPCC09K8/594
Inventor 李松岩李兆敏王继乾王鹏李宾飞孙乾
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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