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A kind of high temperature resistant ultra-long chain viscoelastic surfactant and its preparation method and application

A surfactant and viscoelastic technology, which is applied in the preparation of carboxylic acid amides, the preparation of amino compounds, chemical instruments and methods, etc., can solve the problem that the deep acidification of rock formation is difficult to achieve, the longitudinal permeability difference of the reservoir is large, and the acid-rock reaction speed is fast. and other problems, to achieve the effects of good chemical structure stability, excellent acid thickening performance, and good thickening effect.

Active Publication Date: 2019-02-15
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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  • A kind of high temperature resistant ultra-long chain viscoelastic surfactant and its preparation method and application
  • A kind of high temperature resistant ultra-long chain viscoelastic surfactant and its preparation method and application
  • A kind of high temperature resistant ultra-long chain viscoelastic surfactant and its preparation method and application

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 high-temperature-resistant ultra-long-chain viscoelastic surfactant of the present invention has a structural formula as follows: in the structural formula, R1 is a saturated or unsaturated alkane with 18 to 22 carbon atoms, and R2 is an H atom, or has 2 to 4 carbons Atomic saturated alkane, R3 is a H atom or a saturated alkane with 2 to 4 carbon atoms, and X—is one of Cl-, Br-, F-, CO32-, SO42-, HCOO- and CH3COO-. The present invention also provides a preparation method of the super-long-chain viscoelastic surfactant and its application as a viscous acid thickener. The ultra-long-chain viscoelastic surfactant of the present invention, as a thickening agent, can meet the use requirements in harsh environments such as high temperature and strong acidity, and has stable structure, high temperature resistance and excellent acid thickening performance.

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 Patents(China)
IPC IPC(8): C07C211/01C07C209/50C07C209/00C07C211/08C07C211/21C09K8/74B01F17/16C09K23/16
CPCC09K8/602C09K8/74C07C209/00C07C209/50C07C231/02C09K2208/30C09K23/00
Inventor 冯玉军王骥殷鸿尧
Owner SICHUAN UNIV
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