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Viscoelastic surfactant composition and preparation method and application thereof

A surfactant and composition technology, applied in the field of viscoelastic surfactant composition and its preparation, can solve the problems of large adsorption capacity, low apparent viscosity at low concentration, etc., and achieve low adsorption capacity and improved ability to solubilize crude oil , the ability to emulsify crude oil and the effect of interface efficiency

Active Publication Date: 2021-12-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of large adsorption capacity of viscoelastic surfactants in sandstone reservoirs and low apparent viscosity at low concentrations in the prior art, the present invention provides a new viscoelastic surfactant composition

Method used

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  • Viscoelastic surfactant composition and preparation method and application thereof
  • Viscoelastic surfactant composition and preparation method and application thereof
  • Viscoelastic surfactant composition and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] (a) Preparation of 1,1,2-potassium octadecyltricarboxylate:

[0087] ①Under nitrogen protection, cut 16.1 grams (0.7 moles) of fresh sodium metal into shreds and carefully add it to 150 ml of absolute ethanol several times. After the reaction of sodium metal is completed, add 112.2 grams (0.7 moles) of diethyl malonate , M=160), 195.6 g (0.5 mol, M=391) of ethyl α-bromostearate, heated to reflux, stopped heating when the pH of the reaction solution was nearly neutral, and cooled to room temperature.

[0088] 2. Add 750 grams of 15wt% potassium hydroxide aqueous ethanol solution (volume ratio of ethanol to water is 4 to 6) in the above reaction solution, heat and reflux for 5 to 6 hours to obtain 1,1,2-octadecyl potassium tricarboxylate ethanol in water. Take 20 grams of the uniform reaction solution to acidify with 10wt% hydrochloric acid, evaporate ethanol, add 50 grams of benzene, separate the water layer, wash 3 times with saturated saline, evaporate the benzene, an...

Embodiment 2

[0092] (a) Preparation of 1,1,2-docosyl potassium tricarboxylate:

[0093] ① Under the protection of nitrogen, cut 23.0 grams (1.0 moles) of fresh sodium metal into shreds and carefully add it to 200 ml of absolute ethanol several times. After the reaction of sodium metal is completed, add 160.1 grams (1.0 moles) of diethyl malonate , M=160), 223.5 g (0.5 mol, M=447) of ethyl α-bromobehenic acid, heated to reflux, stopped heating when the pH of the reaction solution was near neutral, and cooled to room temperature.

[0094] ②Add 750 grams of 20 wt% potassium hydroxide ethanol aqueous solution (the volume ratio of ethanol to water is 4 to 6) to the above reaction solution, and heat to reflux for 7 hours to obtain the ethanol of 1,1,2-docosyl potassium tricarboxylate aqueous solution. Take 20 grams of the uniform reaction solution to acidify with 10wt% hydrochloric acid, evaporate ethanol, add 50 grams of benzene, separate the water layer, wash 3 times with saturated saline, ev...

Embodiment 3

[0098] (a) Preparation of 1,1,2-(9-ene octadecyl)potassium tricarboxylate:

[0099] ① Under the protection of nitrogen, cut 13.8 grams (0.6 moles) of fresh sodium metal into shreds and carefully add it to 120 ml of absolute ethanol several times. After the reaction of sodium metal is completed, add 96.1 grams (0.6 moles) of diethyl malonate , M=160), 194.6 g (0.5 mol, M=389) of ethyl α-bromo-9-octadecanoate, heated to reflux, stopped heating when the pH of the reaction solution reached nearly neutral, and cooled to room temperature.

[0100] ②Add 1000 g of 10 wt% potassium hydroxide ethanol aqueous solution (the volume ratio of ethanol to water is 5 to 5) to the above reaction solution, and heat to reflux for 5 hours to obtain 1,1,2-(9-octadecyl)tricarboxylic acid Aqueous solution of potassium phosphate in ethanol. Take 20 grams of the uniform reaction solution to acidify with 10wt% hydrochloric acid, evaporate ethanol, add 50 grams of benzene, separate the water layer, wash ...

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Abstract

The invention discloses a viscoelastic surfactant composition and a preparation method and application thereof. The composition comprises a multi-hydrophilic-head-group anionic surfactant as shown in formula (I) and a zwitterionic surfactant. In the formula (I), R1 and R2 are respectively and independently selected from hydrogen, C6-C36 alkyl, C6-C36 substituted alkyl or sulfonic acid group, and R1 and R2 are not hydrogen or sulfonic acid group at the same time; a and b are respectively and independently 0 or 1 and are not 0 at the same time; c is 1 or 2; x is the number of cationic groups enabling the system to be electrically neutral, x is any integer of 2-5, and n + is the charge number of cations or cationic groups; and M is hydrogen, alkali metal, alkaline earth metal or ammonium. According to the composition disclosed by the invention, due to the synergistic effect among the components, the composition has the advantages of high apparent viscosity, increase of interfacial activity, decrease of critical micelle concentration, improvement of crude oil solubilizing capacity and the like.

Description

technical field [0001] The invention relates to a surfactant composition, in particular to a viscoelastic surfactant composition and a preparation method and application thereof. Background technique [0002] Different from general surfactants, viscoelastic surfactants (VES) first form spherical micelles when the concentration reaches the critical micelle concentration; as the concentration increases, the spherical micelles begin to transform into worm-like micelles, and the worm-like micelles rapidly Generate, grow and form flexible long rod-shaped micelles, and the rod-shaped micelles adhere to and entangle with each other to form a supramolecular network structure similar to that of associative polymers. [0003] As a special surfactant, viscoelastic surfactants are mainly used in cleaning fracturing fluids (VES fluid, CFRAC for short), and studies on viscoelastic surfactants in tertiary oil recovery have also been reported. Many oil companies at home and abroad have suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/60C07C51/09C07C51/38C07C55/22C07C57/02C07C303/30C07C309/70C07C303/32C07C309/17C07C67/343C07C69/34C07C69/533
CPCC09K8/584C09K8/602C07C51/09C07C51/38C07C303/30C07C303/32C07C67/343C09K2208/30C07C69/34C07C55/22C07C69/533C07C57/02C07C309/70C07C309/17
Inventor 沈之芹李应成虞辰敏裘鋆
Owner CHINA PETROLEUM & CHEM CORP
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