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High temperature resistant Gemini cationic viscoelastic surfactant (VES) and synthetic method thereof

A technology of surfactant and synthesis method, which is applied in chemical instruments and methods, drilling compositions, preparation of organic compounds, etc., can solve the problems of limited popularization and application, poor temperature resistance, etc., and achieve favorable promotion and application and low price Inexpensive, fast flowback effect

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the temperature resistance of the clean steering acid system used in the domestic field is poor, which limits the popularization and application of this technology

Method used

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  • High temperature resistant Gemini cationic viscoelastic surfactant (VES) and synthetic method thereof
  • High temperature resistant Gemini cationic viscoelastic surfactant (VES) and synthetic method thereof
  • High temperature resistant Gemini cationic viscoelastic surfactant (VES) and synthetic method thereof

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Experimental program
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Embodiment Construction

[0026] 1. Preparation of high temperature resistant Gemini cationic viscoelastic surfactant:

[0027] 1. Preparation of high temperature resistant erucic acid amide-based Gemini cationic viscoelastic surfactant:

[0028] Add erucic acid into the three-necked flask, heat until it completely melts, and add N,N-dimethylpropylenediamine and appropriate amount of potassium hydroxide dropwise to the flask with a constant pressure dropping funnel under argon protection and stirring Aqueous solution, the dropping time is controlled at about 15 minutes, in which the molar ratio of unsaturated fatty acid, N,N-dimethylpropylenediamine and potassium hydroxide is 1:1.12~1.15:0.003; after dropping, stir and heat to 180°C , After reacting for 12 h, cool to room temperature, and distill off unreacted amine and water under reduced pressure to obtain intermediate product A as a light brown solid.

[0029] Add methanol solution of methylamine to another flask, then add absolute ethanol, put it ...

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Abstract

The invention provides a high temperature resistant Gemini cationic viscoelastic surfactant (VES) and a synthetic method thereof, relating to the field of oil recovery technology and engineering in the petroleum industry. The synthetic method is characterized by reacting unsaturated long-chain fatty acid with N,N-dimethyl propanediamine to synthesize a fatty acid amide intermediate; reacting methylamine with epichlorohydrin to synthesize a chloramine intermediate; reacting the intermediates synthesized in the two above steps respectively to synthesize the high temperature resistant Gemini cationic VES. The VES and the synthetic method have the beneficial effects that a high temperature surface active diverting acid system reacts with rocks at 160 DEG C, so that the liquid obviously diverts to become viscous and is subjected to automatic gel breaking under the condition that the hydrochloric acid concentration is below 5%, thus achieving rapid flowback; the VES has good temperature resistance, is relatively low in price and is beneficial for popularization and application.

Description

technical field [0001] The invention relates to the technical engineering field of oil extraction in the petroleum industry, in particular to the technical field of synthesis of an acid thickener used in the acidification of oil and gas wells in the oil extraction industry. Background technique [0002] Surfactants that can make aqueous solutions form viscoelastic fluids are currently called viscoelastic surfactants. This type of surfactant has excellent comprehensive properties, such as: ①Easy biodegradation, no organic solvent, green and environmentally friendly, safe to use; ②Small molecular weight, easy to flow back, and will not cause damage to the formation; ③Soluble in hot water , can be made into a concentrated solution, which is convenient for on-site use; ④ outstanding performance, the VES clean fracturing fluid can withstand high temperatures above 100 ℃; Viscoelasticity, high viscosity under low shear, shear thinning, triggering, and excellent viscosity-temperat...

Claims

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Application Information

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IPC IPC(8): C09K8/74C07C233/38C07C231/12
CPCC07C231/12C07C233/38C09K8/74C09K2208/30
Inventor 袁萍虞建业卢敏晖马巍
Owner CHINA PETROLEUM & CHEM CORP
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