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Gemini type air humidity reversal agent compound as well as preparation method and application thereof

The technology of a gas-wet reversal agent and compound is applied in the field of the twin-type gas-wet reversal agent compound and its preparation, which can solve the problems of the research on the wetting reversal of the core surface, the lack of on-site conditions, and the high requirements for production conditions, etc. Achieving good hydrophobic and oleophobic properties, favorable for field promotion and good application effect

Active Publication Date: 2018-05-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN102504790A discloses a system composed of cationic fluorocarbon surfactant FC911, cetyltrimethylammonium bromide and water, which can reverse the wettability of the core surface from liquid wetness to neutral gas wetness, but This method is used in a large amount and the effect is not good, so it is difficult to promote in the field
However, the production conditions of this formula are relatively high, and it is not economically feasible, and the formula does not study the wetting reversal of the core surface
[0004] The above methods in the prior art fail to reverse the wettability of the shale surface from liquid wettability to gas wettability, or the amount used is too large, which does not meet the conditions for field use, and cannot be generally applied to shale gas Mining

Method used

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  • Gemini type air humidity reversal agent compound as well as preparation method and application thereof
  • Gemini type air humidity reversal agent compound as well as preparation method and application thereof
  • Gemini type air humidity reversal agent compound as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0078] (1) The preparation of the Gemini type VIR compound (formula I, n=1), the steps are as follows:

[0079] (1) Take 415g (1mol) of perfluorooctanoic acid in a glass reactor, add 8g (0.1mol) of pyridine under stirring conditions, and slowly drop 167g (1.4mol) of thionyl chloride into Wherein, and continue stirring for 1 hour, then heat up to 80°C, reflux the thionyl chloride for 4 hours, cool to room temperature, and collect 128°C-130°C fractions by atmospheric distillation, which is product A (compound of formula II). The rate is 97%.

[0080] (2) Take 300mL of absolute ethanol in a glass reactor, add 215g (0.5mol) of the product A obtained in step (1) and 14g (0.25mol) of calcium oxide into it, and under stirring, pass through fully dried ammonia Gas 44L (2mol), and continue to stir for 4 hours, control temperature below 15 ℃, carry out suction filtration after reaction finishes, utilize rotary evaporator to remove solvent again, dry to obtain finished product B (compou...

Embodiment 2

[0088] Embodiment 2, preparation of gemini type gas humidity reversal agent compound

[0089] As described in Example 1, the difference is that the molar ratio of product C to chloroacetic acid in step (4) is 1:1.2. The final product obtained through step (5) is sodium N,N-bis(perfluorooctanoyl)imide acetate, and the yield of the obtained product is 92%.

[0090] And configure the solution with a mass fraction of 0.05%, soak shale with it for 48 hours, place it at room temperature for 8 hours after drying, measure the contact angle of the water phase and oil phase on the shale surface after treatment, and the water phase contact angle is 119 ° (such as image 3 shown), the oil phase contact angle is 92° (as Figure 10 shown).

Embodiment 3

[0091] Embodiment 3, preparation of gemini type gas humidity reversal agent compound

[0092] As described in Example 1, the difference is that the chlorocarboxylic acid in the reactant of step (4) is chloropropionic acid. The final product obtained is sodium N,N-bis(perfluorooctanoyl)iminopropionate, and the yield of the obtained product is 88%.

[0093] The product was added with deionized water to prepare a solution with a mass fraction of 0.05%, soaked in shale for 48 hours, dried and placed at room temperature for 8 hours, and measured the contact angle of the water phase and oil phase on the shale surface after treatment. The phase contact angle is 117° (such as Figure 4 shown), the oil phase contact angle is 127° (as Figure 11 shown).

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Abstract

The invention relates to a gemini type air humidity reversal agent compound as well as a preparation method and application thereof. The gemini type air humidity reversal agent compound is N,N-di(perfluoro-capryloyl) imine carboxylate. The invention also provides a preparation method of the gemini type air humidity reversal agent compound. The gemini type air humidity reversal agent compound is easy to prepare, relatively high in yield, can be prepared into an aqueous solution with water in any proportion and can change liquid humidity of the surface of a shale reservoir into air humidity, oil-gas recovery ratio is increased, and field application is facilitated.

Description

technical field [0001] The invention relates to a gemini-type gas-moisture reversal agent compound for changing shale reservoirs from liquid-wet to gas-wet and a preparation method thereof, belonging to the petrochemical technical field of improving shale gas recovery. technical background [0002] With the continuous change of the energy pattern, my country has set off an upsurge in the development and research of unconventional oil and gas resources, especially the clean and environmentally friendly shale gas resources with large reserves. At present, it has been proven that my country's exploitable shale gas resource reserves exceed 30 trillion cubic meters, which is equivalent to nearly twice the total reserves claimed by the United States. In the case of energy shortage, vigorously developing shale gas resources has key strategic significance. In the process of shale gas development, due to the adsorption of gel breaker on the surface of shale reservoirs, the effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/12C07C233/91C09K8/58
CPCC07C51/60C07C53/50C07C231/02C07C231/08C07C231/12C07C233/05C07C233/91C09K8/58
Inventor 王彦玲李永飞李强尹子辰汤龙皓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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