A preparation method of acid-resistant thickener and its application in multifunctional acid and acid-resistant fracturing fluid

A technology of thickener and solubilizer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex on-site operation, poor compatibility between acid liquid and fracturing fluid, and various types of additions, etc., to achieve controllable Strong performance, easy on-site operation, fast dispersion and dissolution

Active Publication Date: 2021-01-22
CHENGDU LEARN PRACTICES TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in large-scale deep acid fracturing reservoir stimulation, there are problems such as poor compatibility between acid fluid and fracturing fluid, various additions, and complex on-site operations. Therefore, it is of great significance to develop a multifunctional composite acid system suitable for alternate injection.

Method used

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  • A preparation method of acid-resistant thickener and its application in multifunctional acid and acid-resistant fracturing fluid
  • A preparation method of acid-resistant thickener and its application in multifunctional acid and acid-resistant fracturing fluid
  • A preparation method of acid-resistant thickener and its application in multifunctional acid and acid-resistant fracturing fluid

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preparation example Construction

[0023] The present invention also provides a preparation method for the above-mentioned acid-resistant thickener, comprising: dissolving acrylamide, cationic hydrophobic monomer, anionic monomer and solubilizer in water in proportion, adjusting the pH to 6.5-7.5 with sodium hydroxide, mixing The solution is heated to 10-40°C, and the initiator is added under the condition of blowing nitrogen to remove oxygen, and the polymerization reaction is carried out for 4-6 hours, and then granulated, and dried at 90-100°C for pulverization. Wherein, before adding the initiator, nitrogen gas is used to remove oxygen for 15-25 minutes.

[0024] The synthetic method of cationic hydrophobic monomer methacryloyloxyethyl dimethyl dodecyl ammonium bromide comprises: weighing dimethylaminoethyl methacrylate (DM ) and dodecane bromide in a reactor, add an appropriate amount of acetone, stir evenly, and react in a closed manner at room temperature (15-30° C.) for 45-50 hours. Then crystallize in...

Embodiment 1

[0035] This embodiment provides an acid-resistant thickener, which is mainly prepared through the following steps:

[0036] By weight percentage, take acrylamide 10%, methacryloxyethyl dimethyl dodecyl ammonium bromide 0.3%, methacrylic acid 20%, solubilizer TX-10 0.3%, initiator ammonium persulfate 0.06% and the balance water.

[0037]Dissolve acrylamide, methacryloyloxyethyl dimethyl dodecyl ammonium bromide, methacrylic acid and solubilizer TX-10 in water, adjust the pH to 7 with sodium hydroxide, and keep the mixed solution warm to 10 ℃, after blowing nitrogen to remove oxygen, add initiator ammonium persulfate to carry out polymerization reaction for 4 hours, then carry out granulation, and dry and pulverize at 100 ℃.

Embodiment 2

[0039] This embodiment provides an acid-resistant thickener, which is mainly prepared through the following steps:

[0040] By weight percentage, take acrylamide 20%, methacryloxyethyl dimethyl dodecyl ammonium bromide 0.5%, methacrylic acid 15%, solubilizer TX-10 0.35%, initiator potassium persulfate 0.1% and the balance water.

[0041] Dissolve acrylamide, methacryloyloxyethyl dimethyl dodecyl ammonium bromide, methacrylic acid and solubilizer TX-10 in water, adjust the pH to 7.5 with sodium hydroxide, and heat the mixed solution to 40 ℃, after blowing nitrogen to remove oxygen, add initiator potassium persulfate to carry out polymerization reaction for 4 hours, then carry out granulation, and dry and pulverize at 90 ℃.

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Abstract

The invention provides a preparation method of an acid-resistant thickening agent and application of the acid-resistant thickening agent in multifunctional acid and acid-resistant fracturing fluid, relating to the technical field of oilfield chemistry. The acid-resistant thickening agent is prepared from the following raw materials by weight percent: 10%-25% of acrylamide, 0.1%-1% of cationic hydrophobic monomers, 5%-25% of anionic monomers, 0.2%-0.8% of a dissolving promoter, 0.05%-0.2% of an initiator and the balance of water. The acid-resistant thickening agent has relatively good thickening performance and is wide in application range and simple and convenient in field operation; and the manpower and material resources are saved. The preparation method comprises the steps of mixing theraw materials, heating for polymerization reaction, and carrying out granulation, drying and drying on polymerization reaction products. The preparation method is simple to operate, strong in controllability and applicable to mass production.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, and in particular to a preparation method of an acid-resistant thickener and its application in multifunctional acids and acid-resistant fracturing fluids. Background technique [0002] In recent years, large-scale deep acid fracturing technology has been widely used in the reconstruction of high-temperature and ultra-high-temperature carbonate reservoirs. High-temperature and ultra-high-temperature carbonate reservoirs have the characteristics of deep burial, high temperature, and high construction pressure. Alternate injection of acid, cross-linking acid, closing acid) and fracturing fluid is the main technical solution to realize large-scale deep acid fracturing, which plays an important role in increasing the fracture length and stimulation range. [0003] However, in large-scale deep acid fracturing reservoir stimulation, there are problems such as poor compatibility between acid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C08F220/56C08F220/06C08F220/34C08F226/02C08F226/04
CPCC08F220/56C09K8/725C09K8/74C08F220/06C08F220/34C08F226/02C08F226/04
Inventor 侯向前寇将郭建春卢聪任山张绍彬唐朝钧王梦莹崔盈贤
Owner CHENGDU LEARN PRACTICES TECH CO LTD
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