Novel polymeric visco-elastic surfactant, and preparation method and application thereof

A surfactant and viscoelasticity technology, applied in the field of novel multi-sub viscoelastic surfactant and its preparation, can solve the problems of high cost, poor sand suspension performance, poor temperature resistance, etc., and achieve low cost and reservoir damage. The effect of small and small amount of raw materials

Active Publication Date: 2017-07-14
SICHUAN GREEN & TOP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a novel multi-child viscoelastic surfactant and its preparation method and application to solve the problems of poor temperature resistance, high cost and poor sand suspension performance

Method used

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  • Novel polymeric visco-elastic surfactant, and preparation method and application thereof
  • Novel polymeric visco-elastic surfactant, and preparation method and application thereof
  • Novel polymeric visco-elastic surfactant, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of a novel multi-child viscoelastic surfactant, comprising the following steps:

[0028] (1) Add 0.2mol of behenic acid into a 250mL three-necked flask, pass argon gas for 10min to remove oxygen, then add 0.22mol of dimethylaminopropylamine, then dropwise add a solution with a water-soluble hypophosphorous acid content of 5wt%, dropwise After completion, the temperature was raised to 150-170°C, protected by argon, refluxed for 12 hours, cooled, and unreacted amine and water were distilled off under reduced pressure to obtain the desired amide product intermediate A;

[0029] (2) Add 0.1mol of dichloroethane, 0.2mol of diethanolamine, appropriate amount of NaOH and 100mL of ethanol into a 250mL round bottom flask, condense and reflux in an oil bath at 80°C for 24 hours, cool to room temperature to remove the solvent, and obtain intermediate B;

[0030] (3) Add 0.2mol of amide product intermediate A and 0.1mol of intermediate B to a 500mL round bottom...

Embodiment 2

[0032] A preparation method of a novel multi-child viscoelastic surfactant, comprising the following steps:

[0033] (1) Add 0.2mol of behenic acid into a 250mL three-necked flask, pass argon gas for 10min to remove oxygen, then add 0.24mol of dimethylaminopropylamine, then add dropwise the solution of 3wt% hypophosphorous acid dissolved in water, dropwise After completion, the temperature was raised to 150 ° C, protected by argon, refluxed for 7 hours, cooled, and unreacted amine and water were removed by vacuum distillation to obtain the desired amide product intermediate A;

[0034] (2) Add 0.1mol of dichloroethane, 0.25mol of diethanolamine, appropriate amount of NaOH and 100mL of ethanol into a 250mL round bottom flask, condense and reflux in an oil bath at 90°C for 20 hours, cool to room temperature to remove the solvent, and obtain intermediate B;

[0035] (3) Add 0.2 mol of amide product intermediate A and 0.1 mol of intermediate B to a 500mL round bottom flask and mix...

Embodiment 3

[0037] A preparation method of a novel multi-child viscoelastic surfactant, comprising the following steps:

[0038] (1) Add 0.2mol stearic acid into a 250mL three-necked flask, vent argon for 10min to remove oxygen, then add 0.26mol dimethylaminopropylamine, then add dropwise a solution of 5wt% sodium acetate dissolved in water, dropwise After completion, the temperature was raised to 164 ° C, protected by argon, refluxed for 8 hours, cooled, and unreacted amine and water were removed by vacuum distillation to obtain the desired amide product intermediate A;

[0039] (2) Add 0.1mol of dichloroethane, 0.3mol of diethanolamine, appropriate amount of NaOH and 100mL of ethanol into a 250mL round-bottomed flask, condense and reflux in an oil bath at 86°C for 24 hours, cool to room temperature to remove the solvent, and obtain intermediate B;

[0040] (3) Add 0.2 mol of amide product intermediate A and 0.1 mol of intermediate B to a 500mL round bottom flask and mix, add ethanol as ...

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Abstract

The invention discloses a novel polymeric visco-elastic surfactant, and a preparation method and an application thereof. The method comprises the following steps: 1, preparing an amide product intermediate A from fatty acid and dimethylaminopropylamine; 2, placing dichloroethane, diethanolamine, NaOH and ethanol in a reaction container, carrying out a reflux reaction for 20-24 h, cooling the obtained reaction product to room temperature, and removing ethanol to obtain an intermediate B; and 3, adding the amide product intermediate A and the intermediate B into the reaction container, adding ethanol, mixing the intermediates and ethanol, and carrying out a reflux reaction for 10-12 h to obtain the novel polymeric visco-elastic surfactant. The novel polymeric visco-elastic surfactant prepared through the method can be used for preparing a low-cost high temperature-resistant clean fracturing fluid to improve the high temperature resistance, the shear resistance and the suspended sand performance of the fracturing fluid.

Description

technical field [0001] The invention belongs to the technical field of fracturing fluid for reservoirs in the petroleum exploitation industry, and in particular relates to a novel multi-child viscoelastic surfactant and its preparation method and application. Background technique [0002] Surfactants that can form viscoelastic fluids in aqueous solutions are currently called viscoelastic surfactants. Compared with the water-based fracturing fluid system with guar gum as the main thickener, this kind of clean fracturing fluid with surfactant as the thickener has more excellent comprehensive performance, such as: ① Less dosage and lower cost ; ②Outstanding performance, the VES clean fracturing fluid can withstand high temperature above 100℃; ③Low friction, good sand-carrying performance; Therefore, it has been applied in many fields and links in oil and gas field stimulation. [0003] In 1997, Schlumberger used viscoelastic surfactant (VES for short) in fracturing operations...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C07C231/12C07C233/36
CPCC07C213/02C07C231/02C07C231/12C09K8/602C09K8/68C09K2208/26C09K2208/30C07C233/36C07C215/40
Inventor 毛金成王萍
Owner SICHUAN GREEN & TOP TECH CO LTD
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