A kind of high temperature resistant cationic polyacrylamide inhibitor and its preparation method and application

A technology of polyacrylamide and acrylamide, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high temperature resistance and low resistance, and achieve good inhibitory effect

Inactive Publication Date: 2019-10-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of high temperature resistance, low molecular weight (molecular weight5 g / mol) water-soluble hydrophobic cationic polyacrylamide inhibitor and its preparation method and application

Method used

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  • A kind of high temperature resistant cationic polyacrylamide inhibitor and its preparation method and application
  • A kind of high temperature resistant cationic polyacrylamide inhibitor and its preparation method and application
  • A kind of high temperature resistant cationic polyacrylamide inhibitor and its preparation method and application

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Effect test

Embodiment 1

[0027] Method for preparing high temperature resistant cationic polyacrylamide inhibitor

[0028] At 25°C, according to the mass percentage of monomers, 60% of acrylamide, 38% of methacryloyloxyethyltrimethylammonium chloride, and 2% of lauryl methacrylate were dissolved in 70% free In the solvent formed by water ethanol and 30% butyl acetate by volume percentage, a reaction liquid with a concentration of 5% of the total mass percentage of monomers was prepared; after the reaction liquid was passed through nitrogen to remove oxygen for 10-30 minutes, azobisisobutyronitrile was added The mass concentration of the ethanol solution is 5%, and the addition amount of azobisisobutyronitrile is 0.2% of the total mass of the monomer; then the temperature is raised to 70°C, and the reaction is carried out for 7 hours; after the reaction is completed, the reaction solution is filtered or centrifuged to obtain Powdered solid, namely high temperature resistant cationic polyacrylamide inhi...

Embodiment 2

[0030] Method for preparing high temperature resistant cationic polyacrylamide inhibitor

[0031] At 25°C, according to the mass percentage of monomers, 60% of acrylamide, 38% of methacryloyloxyethyltrimethylammonium chloride, and 2% of lauryl methacrylate were dissolved in 80% free In the solvent formed by water ethanol and 20% butyl acetate by volume percentage, a reaction liquid with a total mass percentage concentration of monomers of 5% was prepared; after the reaction liquid was purged with nitrogen for 10-30 minutes, azobisisobutyronitrile was added The mass concentration of the ethanol solution is 5%, and the addition amount of azobisisobutyronitrile is 0.2% of the total mass of the monomer; then the temperature is raised to 70°C, and the reaction is carried out for 7 hours; after the reaction is completed, the reaction solution is filtered or centrifuged to obtain Powdered solid, namely high temperature resistant cationic polyacrylamide inhibitor.

Embodiment 3

[0033] Method for preparing high temperature resistant cationic polyacrylamide inhibitor

[0034] At 25°C, according to the mass percentage of monomers, 60% of acrylamide, 39% of acryloyloxyethyltrimethylammonium chloride, and 2% of hexadecyl methacrylate were dissolved in 80% free In the solvent formed by water ethanol and 20% butyl acetate by volume percentage, the reaction liquid with the total mass percentage concentration of the monomers being 4% is prepared; Ethanol solution with a mass concentration of 5%, the amount of benzoyl peroxide added is 0.2% of the total mass of the monomer; then the temperature is raised to 80°C, and the reaction is carried out for 4 hours; after the reaction, the reaction solution is filtered or centrifuged to obtain a powder Solid, that is, high temperature resistant cationic polyacrylamide inhibitor.

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Abstract

The invention belongs to the technical field of water-based drilling fluid inhibitors. The invention relates to a high-temperature resistant cationic polyacrylamide inhibitor and its preparation method and application. The inhibitor is formed by copolymerization of acrylamide, cationic monomer and hydrophobic monomer The application method of the inhibitor is as follows: at room temperature, add a certain amount of high-temperature-resistant cationic polyacrylamide inhibitor into water to fully pre-hydrate, and then mix it with drilling fluid evenly. Compared with the prior art, the present invention has the following advantages: because the cationic polyacrylamide inhibitor has a low molecular weight and contains a high-temperature-resistant hydrophobic structural unit, it can not only solve the problem of molecular weight and drilling fluid rheology of the existing polymer quaternary ammonium salt inhibitor The contradiction between, and at high temperature (> 100 ℃) has excellent inhibition.

Description

technical field [0001] The invention belongs to the technical field of inhibitors for water-based drilling fluids. The invention relates to a high-temperature-resistant cationic polyacrylamide inhibitor and its preparation method and application, in particular to a high-temperature-resistant, low-molecular water-soluble hydrophobic inhibitor for drilling fluids. Cationic polyacrylamide shale inhibitor, its preparation method and application. Background technique [0002] Inhibitor is an indispensable part of water-based drilling fluid. Its main function is to prevent shale hydration and expansion, and reduce the probability of complex situations such as wellbore instability and pipe sticking during drilling. Cationic inhibitors are one of the widely researched and applied water-based drilling fluid inhibitors. This is mainly because the cationic inhibitors can neutralize the negatively charged clay particles, quickly build up a hydrophobic barrier on the surface of the clay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/18C09K8/24
CPCC09K8/24C08F220/56C08F220/34C08F220/1812C08F220/1818
Inventor 贺杰陈馥杜蕊
Owner SOUTHWEST PETROLEUM UNIV
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