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High temperature resisting ultralong chain viscoelastic surfactant, preparation method and application thereof

A surfactant and viscoelastic technology, applied in the preparation of carboxylic acid amide, preparation of amino compounds, chemical instruments and methods, etc., can solve the problems of difficult acidification in deep rock formations, large differences in vertical permeability of reservoirs, and fast acid-rock reaction speed and other problems, to achieve the effects of good chemical structure stability, excellent acid thickening performance, and good viscosity-increasing effect

Active Publication Date: 2017-08-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Acidizing and acid fracturing technologies are effective ways to restore and increase the production of low-permeability oil and gas wells, but for a long time, there have been several problems in the process of acidizing and acid fracturing: (1) The acid rock reaction speed is too fast, resulting in deep acidification of rock formations Difficult to realize; (2) During the matrix acidizing process, due to the large difference in the vertical permeability of the reservoir, the acid liquid preferentially flows into the high-permeability zone, resulting in excessive dissolution of the high-permeability zone, while the low-permeability zone that needs to be reformed is hardly available. (3) During the process of fracturing and acidizing (acid fracturing), acid fluid loss is serious and difficult to control
[0005] In addition, the mass fraction of the VES thickener in the existing viscous acid solution needs to reach more than 5% to ensure a high viscosity of the acid solution, and the economic cost is relatively high

Method used

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  • High temperature resisting ultralong chain viscoelastic surfactant, preparation method and application thereof
  • High temperature resisting ultralong chain viscoelastic surfactant, preparation method and application thereof
  • High temperature resisting ultralong chain viscoelastic surfactant, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Weigh 16.92g (0.05mol) cis-docos-13-enoic acid (commonly known as "erucic acid") and dissolve it in dichloromethane, add 4.02g (0.055mol) diethylamine, 19.1g ( 0.1mol) EDC·HCl, after the dissolution is complete, add 1.22g (0.01mol) DMAP, and react at room temperature for 24h. After the reaction is over, dilute the reaction solution with 250mL of dichloromethane, then use 0.1% HCl solution, saturated NaHCO 3 solution and saturated NaCl solution were washed three times, the organic phase was collected, and anhydrous MgSO 4 Dry for 2 hours, filter, remove the solvent by rotary evaporation of the filtrate, and dry in vacuo to obtain N,N-diethyl-N-n-docosylamide. For its structural characterization, see 1 H NMR spectrum ( figure 1 ), the chemical shifts of each proton peak in the compound have been assigned in the spectrum, and the ratio of the integral area of ​​each proton resonance peak is in good agreement with the theoretical value, indicating that the compound ha...

Embodiment 2

[0050] The difference between this implementation and Example 1 is that in step (4), the amount of HCl solution is such that N-(cis-docos-9-enyl)-N,N-diethyl tertiary amine salt The mass concentration of acid salt in viscous acid solution is 3.5%.

[0051] At a shear rate of 100s -1 The relationship between the viscosity of viscous acid solution obtained by measuring the change with temperature and time is as follows, the results are shown in Figure 4 . From Figure 4 It can be seen that when the temperature is stable at 150°C, the viscosity of the solution is relatively stable and greater than 20mPa·s, indicating that the viscoelastic ultra-long-chain surfactant obtained in this example has good temperature resistance as a thickener.

Embodiment 3

[0053] (1) Weigh 17.03g (0.05mol) of behenic acid (commonly known as "arachidic acid") and dissolve it in dichloromethane, then add 4.75g (0.065mol) of diethylamine and 21.01g (0.11mol) of EDC. After HCl is completely dissolved, add 1.83g (0.015mol) DMAP, and react at room temperature for 30h. After the reaction, dilute the reaction solution with 250mL dichloromethane, and then use 0.2% HCl solution, saturated NaHCO 3 solution and saturated NaCl solution were washed three times, the organic phase was collected, and anhydrous MgSO 4 Dry, filter, remove the solvent by rotary evaporation of the filtrate, and dry in vacuo to obtain N,N-diethyl-N-n-docosylamide, whose structure is characterized in 1 H NMR spectrum ( Figure 5 ), the chemical shifts of each proton peak in the compound have been assigned in the spectrum, and the ratio of the integral area of ​​each proton resonance peak is in good agreement with the theoretical value, indicating that the compound has been successfu...

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Abstract

The invention relates to a high temperature resisting ultralong chain viscoelastic surfactant. The structure formula is as follows. In the structure formula, R1 is saturated or unsaturated alkane with 18-22 carbon atoms; R2 is H atom or saturated alkane with 2-4 carbon atoms; R3 is H atom or saturated alkane with 2-4 carbon atoms; X- is one of Cl-, Br-, F-, CO32-, SO42-, HCOO- and CH3COO. The invention also provides a reparation method of the ultralong chain viscoelastic surfactant and an application thereof as a thickening agent for thickening acid liquor. The ultralong chain viscoelastic surfactant disclosed by the invention which is used as the thickening agent can meet the use requirements under severe environments, such as, high temperature and strong acid and has structure stabilization, high temperature resistance and excellent acid liquor thickening property.

Description

technical field [0001] The invention belongs to the field of oil and gas exploitation, and in particular relates to a viscoelastic surfactant, its preparation method and its application as a viscous acid liquid thickener. Background technique [0002] Acidizing and acid fracturing technologies are effective ways to restore and increase the production of low-permeability oil and gas wells, but for a long time, there have been several problems in the process of acidizing and acid fracturing: (1) The acid rock reaction speed is too fast, resulting in deep acidification of rock formations Difficult to realize; (2) During the matrix acidizing process, due to the large difference in the vertical permeability of the reservoir, the acid liquid preferentially flows into the high-permeability zone, resulting in excessive dissolution of the high-permeability zone, while the low-permeability zone that needs to be reformed is hardly available. (3) During the process of fracturing and aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/16C07C209/50C07C209/00C07C211/08C07C211/21C09K8/74C09K23/16
CPCC09K8/602C09K8/74C07C209/00C07C209/50C07C231/02C09K2208/30C09K23/00
Inventor 冯玉军王骥殷鸿尧
Owner SICHUAN UNIV
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