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High-temperature-resistant clean fracturing fluid thickener and preparation method of same

A technology for cleaning fracturing fluids and thickeners, applied in chemical instruments and methods, sulfonate preparation, organic chemistry, etc. It solves problems such as repeated fracturing, and achieves the effect of a wide range of service conditions, high productivity and good viscoelasticity.

Inactive Publication Date: 2017-05-10
佛山慧创正元新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early stage of development, the thickener of clean fracturing fluid is mainly cationic quaternary ammonium salt type surfactant. Since most rock formation surfaces will have negative charges, there will be a large loss when using cationic clean fracturing fluid, and Some cationic instant noodle active agents will change the wettability of oil and gas layer rocks, thereby affecting the permeability of rocks, which will be unfavorable for oil and gas exudation in oil and gas layers and repeated fracturing operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolve 100mmol 2,2-bis(bromomethyl)-1,3-propanediol and 150mmol cocamidopropyl dimethylamine in absolute ethanol, place in the reaction kettle, stir evenly, and ultrasonically 45min, reflux reaction at 70°C for 24h, after which the solvent was evaporated to obtain the intermediate;

[0022] (2) Sodium hydride was washed with anhydrous THF, and centrifuged, and washed repeatedly 3 times;

[0023] (3) Dissolve the intermediate prepared in the above steps with absolute ethanol, add treated sodium hydride, stir evenly, and then add dropwise the absolute ethanol solution of 3mol / L 1,3-propane sultone to In the mixed solution, reflux at 70°C for 18 hours. After the reaction, use 15% dilute hydrochloric acid to react with excess sodium hydride. After filtering, evaporate the organic solvent to obtain the desired thickener.

[0024] The critical micelle concentration of the prepared thickener is 3.73×10 -4 .

Embodiment 2

[0026] (1) Dissolve 100mmol 2,2-bis(bromomethyl)-1,3-propanediol and 200mmol cocamidopropyl dimethylamine in DMF, place in a reaction kettle, stir well, and ultrasonicate for 60min, Reflux reaction at 65°C for 24h, and then distill off the solvent to obtain the intermediate;

[0027] (2) Sodium hydride was washed with anhydrous THF, and centrifuged, and washed repeatedly 3 times;

[0028] (3) Dissolve the intermediate prepared in the above steps with DMF, add treated sodium hydride, stir evenly, then add 3mol / L 1,3-propane sultone DMF solution dropwise to the mixed solution, Reflux at 65°C for 18 hours. After the reaction, use 15% dilute hydrochloric acid to react with excess sodium hydride. After filtering, evaporate the organic solvent to obtain the desired thickener.

[0029] The critical micelle concentration of the prepared thickener is 3.73×10 -4 .

Embodiment 3

[0031] (1) Dissolve 100mmol 2,2-bis(bromomethyl)-1,3-propanediol and 250mmol cocoamidopropyl dimethylamine in propylene glycol, place it in the reaction kettle, stir it evenly, and ultrasonically 30- 60min, reflux reaction at 80°C for 16h, after which the solvent was evaporated to obtain the intermediate;

[0032] (2) Sodium hydride was washed with anhydrous THF, and centrifuged, and washed repeatedly 3 times;

[0033] (3) Dissolve the intermediate prepared in the above steps with propylene glycol, add treated sodium hydride, stir well, then add 3mol / L 1,3-propane sultone propylene glycol solution dropwise into the mixed solution, Reflux reaction at 80°C for 16 hours. After the reaction, 15% dilute hydrochloric acid was used to react with excess sodium hydride. After filtering, the organic solvent was evaporated to obtain the desired thickener.

[0034] The critical micelle concentration of the prepared thickener is 3.73×10 -4 .

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Abstract

The invention discloses a high-temperature-resistant clean fracturing fluid thickener and a preparation method of same. The thickener is prepared through the steps of: preparing an intermediate from 2,2-bis(bromomethyl)-1,3-propylene glycol and cocamidopropyl dimethylamine, and performing a reaction to the intermediate with sodium hydride and a 1,3-propane sultone solution. The thickener is tolerant to high temperature, has high available temperature range, is good in stability, has excellent effects even in a less usage amount, and is low in cost.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a high-temperature resistant clean fracturing fluid thickener and a preparation method thereof. Background technique [0002] With the gradual increase of three-low oil and gas fields with "low pressure, low production, and low permeability" in recent years, the difficulty of oil extraction has rapidly increased, and fracturing operations have become an important means of oil and gas field extraction. Fracturing fluid is the general term for various liquids in the hydraulic fracturing construction process. It plays a key role in the hydraulic fracturing construction process, and can reduce the formation temperature, carry proppant, and clean the wellbore and near-well oil layers. [0003] At present, fracturing fluids include foam fracturing fluid, emulsified fracturing fluid, oil-based fracturing fluid and water-based fracturing fluid, etc. Among them, wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C07C303/28C07C309/65C07D327/04
CPCC09K8/68C07C303/28C07D327/04C07C309/65
Inventor 叶青
Owner 佛山慧创正元新材料科技有限公司