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Amphoteric gemini surfactant, temperature-resistant and salt-resistant nanoemulsion, preparation method and application thereof

A technology of main surfactant and gemini surface, applied in the direction of chemical instruments and methods, organic chemistry, drilling compositions, etc., can solve the problems of not playing the role, achieve excellent oil-water interfacial tension ability, good viscosity drop Coagulation effect, beneficial to the recovery effect

Active Publication Date: 2022-05-24
北京九恒质信能源技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the currently disclosed nanoemulsions for fracturing are developed around the functions of anti-swelling and flowback. Although these fracturing fluid products can play a certain role in the near-wellbore zone, they are not effective for penetrating into the formation or even remaining in the formation. As far as the part of oil and gas fracturing fluid is concerned, it has not played its role

Method used

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  • Amphoteric gemini surfactant, temperature-resistant and salt-resistant nanoemulsion, preparation method and application thereof
  • Amphoteric gemini surfactant, temperature-resistant and salt-resistant nanoemulsion, preparation method and application thereof
  • Amphoteric gemini surfactant, temperature-resistant and salt-resistant nanoemulsion, preparation method and application thereof

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preparation example Construction

[0061] In some preferred embodiments, the preparation method of the temperature-resistant and salt-resistant nanoemulsion for fracturing fluid comprises the following steps:

[0062] Dissolve the main surfactant and the sub-surfactant in the oil phase, and stir evenly at a stirring speed of 100-400 rpm;

[0063] The temperature is raised to 40-70° C., and after stirring and reacting for 30-50 minutes, water and co-surfactant are slowly added dropwise, and stirring is continued for 30-90 minutes to obtain the temperature-resistant and salt-resistant nanoemulsion for fracturing fluid.

[0064] The method of the present application can prepare a nanoemulsion with low nanometer size and high stability through the combination of various surfactants and a simple synthesis process, and the prepared nanoemulsion has a stability of more than 12 months.

[0065] The nanoemulsion of the present application is small in particle size, and has a small size effect, making it easy to inject i...

Embodiment 1

[0069] Preparation of Amphoteric Gemini Surfactant

[0070] In the reactor, start stirring, dissolve 35.8 g of N,N-diethyl-p-phenylenediamine in 200 mL of dichloromethane, add 121.2 g of bromotetradecane, heat up to 60°C, react for 5 hours, then add 82.0 g of sodium 2-bromoethylsulfonate was added, the temperature was raised to 70°C, and the solvent was distilled off after 6 hours of reaction to obtain the amphoteric gemini surfactant.

[0071] Wherein, the infrared identification spectrum of the gemini surfactant prepared in this example is as follows: figure 1 shown, from figure 1 It can be seen that the FTIR spectrum of the gemini surfactant is at 2963.15 cm -1 and 2838.15cm -1 There is a stretching vibration absorption peak of methylmethylene C-H on the alkyl chain, at 693.60cm -1 There are skeleton vibration peaks of long-chain methylene groups with carbon number greater than 4, at 1020.10cm -1 Presence of sulfonic acid -SO 3 The stretching vibration absorption peak...

Embodiment 2

[0074] Weigh 45.0g olive oil and 42.5g turpentine into the reactor, start stirring, add 87.2g gemini surfactant (n=2, R at 400rpm) 1 is ethyl, R 2 be 14 alkyl), 30.0g lauryl polyoxyethylene (6) ether, 40.5g cocamidopropyl betaine, slowly be warming up to 60 ℃ under stirring, stirring reaction 30min, then slowly drip 52.5g isobutanol and 52.0 g water mixture. After the dropwise addition, the reaction was continued to be stirred at 60° C. for 60 min to obtain a transparent nanoemulsion SD-1.

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Abstract

The application discloses an amphoteric gemini surfactant, a temperature-resistant and salt-resistant nanoemulsion and its preparation method and application, wherein the temperature-resistant and salt-resistant nanoemulsion contains: 5-30% oil phase, 10-30% oil phase 40% main surfactant, 5-30% secondary surfactant, 3-18% co-surfactant and the balance of water, wherein the main surfactant is the amphoteric gemini surfactant disclosed in this application. The nanoemulsion of the present application has significant temperature and salt resistance by introducing an amphoteric gemini surfactant with a phenyl linking group. The temperature resistance reaches 150 ° C, and the salt resistance is above 30% NaCl, and has high surface activity. High flowback efficiency, high oil washing efficiency and many other advantages.

Description

technical field [0001] The application belongs to the technical field of petroleum exploitation, and particularly relates to an amphoteric gemini surfactant, a temperature-resistant and salt-resistant nanoemulsion, and a preparation method and application thereof. Background technique [0002] At present, at home and abroad, the development of unconventional oil and gas reservoirs is becoming more and more in-depth and large-scale. In particular, the development of tight oil reservoirs and shale gas is in full swing. Hydraulic fracturing technology is a mature and commonly used technical means to stimulate unconventional oil and gas production. For tight oil and gas wells, even though the fracturing plan designs an approximate fracturing scale for each cluster of fractures in each section, the on-site distributed temperature fiber testing (DTS) and production logging results often show that the degree of development of each cluster of fractures varies greatly. , more than ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C07C309/14
CPCC09K8/602C09K8/68C09K8/885C07C309/14
Inventor 徐文熙
Owner 北京九恒质信能源技术有限公司
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