A kind of high temperature resistant thickener and its preparation method and application

Abstract

The invention discloses a high-temperature-resistant acidic cross-linked polymer thickener, a preparation method and application thereof, and belongs to the technical field of fracturing fluid for oilfield reservoir reconstruction. The thickener consists of four monomers of acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and p-alkenylbenzenesulfonate to form a straight-chain and cross-linkable low Molecular polymer with high sand-carrying performance and shear resistance, easy to dissolve, no pollution, and little damage to the reservoir. The thickener contains a benzene ring structure and can withstand high temperatures. It is suitable for high-temperature, strong alkali-sensitive formations. Fracturing. The method for preparing the high-temperature-resistant acidic cross-linked low-molecular weight thickener of the invention is simple and low in cost, and is suitable for large-scale production and application. The gel-breaking liquid system prepared by using the thickener is in the form of jelly, without precipitation and separation, good compatibility, excellent sand-carrying performance and gel-breaking performance, and less damage to the reservoir.

Description

technical field

[0001] The invention specifically relates to a high-temperature-resistant thickener, and also relates to a preparation method and application of the thickener, and belongs to the technical field of fracturing fluid for oil field reservoir reconstruction. Background technique

[0002] The purpose of hydraulic fracturing is to form fractures with a certain size and conductivity in the formation through high-pressure injection of fracturing fluid. The water-based system is currently the most widely used fracturing fluid, which uses water as the dispersion medium and adds various Treatment agents, especially water-soluble polymers, form a working fluid with strong comprehensive properties required by the fracturing process.

[0003] The water-based fracturing fluid thickener is mainly a synthetic polymer made of guar gum. Due to the large molecular weight of guar gum, which is about 2 million, the thickener contains relatively high residues, which can easily lead...

Examples

Embodiment 1

[0044] The high-temperature-resistant thickener in this example is copolymerized in an aqueous solution with a pH value of 6 by acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, and sodium p-vinylbenzenesulfonate. Formed, wherein the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to sodium p-vinylbenzenesulfonate is 4:1, acrylic acid, acrylamide and 2-acrylamido-2-methylpropanesulfonate The mass ratio of acid and sodium p-vinylbenzenesulfonate mixture is 1:8:2.

[0045] The preparation method of high temperature resistant thickener in the present embodiment, comprises the following steps:

[0046] (1) Solution preparation: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 30%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 6.5 under stirring conditions, and continue to stir and mature for 30 minutes ;

[0047] (2) Adjustment of the solution: adjust th...

Embodiment 2

[0051] The high temperature resistant thickener in this example is copolymerized by four monomers of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and sodium p-acrylbenzenesulfonate in an aqueous solution with a pH value of 7. Formed, wherein the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to sodium p-propenylbenzenesulfonate is 5:1, acrylic acid, acrylamide and 2-acrylamido-2-methylpropane The mass ratio of the mixture of sulfonic acid and sodium p-propenylbenzenesulfonate is 1.5:10:2.

[0052] The preparation method of high temperature resistant thickener in the present embodiment, comprises the following steps:

[0053] (1) Preparation of the solution: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 25%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 7 under stirring conditions, and continue to stir and mature for 30 minutes ;

[0054] (2) ...

Embodiment 3

[0058] The high temperature resistant thickener in this example is copolymerized by four monomers of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and sodium p-vinylbenzenesulfonate in an aqueous solution with a pH value of 8. Made, wherein the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to sodium p-vinylbenzenesulfonate is 8:1, acrylic acid, acrylamide and 2-acrylamido-2-methylpropanesulfonate The mass ratio of acid and sodium p-vinylbenzenesulfonate mixture is 1:15:4.

[0059] The preparation method of high temperature resistant thickener in the present embodiment, comprises the following steps:

[0060] (1) Preparation of the solution: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 40%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 7 under stirring conditions, continue to stir and mature for 30 minutes ;

[0061] (2) Adjustment of the sol...

technical field

[0001] The invention specifically relates to a high-temperature-resistant thickener, and also relates to a preparation method and application of the thickener, and belongs to the technical field of fracturing fluid for oil field reservoir reconstruction. Background technique

[0002] The purpose of hydraulic fracturing is to form fractures with a certain size and conductivity in the formation through high-pressure injection of fracturing fluid. The water-based system is currently the most widely used fracturing fluid, which uses water as the dispersion medium and adds various Treatment agents, especially water-soluble polymers, form a working fluid with strong comprehensive properties required by the fracturing process.

[0003] The water-based fracturing fluid thickener is mainly a synthetic polymer made of guar gum. Due to the large molecular weight of guar gum, which is about 2 million, the thickener contains relatively high residues, which can easily lead...

Examples

Embodiment 1

[0044] The high-temperature-resistant thickener in this example is copolymerized in an aqueous solution with a pH value of 6 by acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, and sodium p-vinylbenzenesulfonate. Formed, wherein the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to sodium p-vinylbenzenesulfonate is 4:1, acrylic acid, acrylamide and 2-acrylamido-2-methylpropanesulfonate The mass ratio of acid and sodium p-vinylbenzenesulfonate mixture is 1:8:2.

[0045] The preparation method of high temperature resistant thickener in the present embodiment, comprises the following steps:

[0046] (1) Solution preparation: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 30%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 6.5 under stirring conditions, and continue to stir and mature for 30 minutes ;

[0047] (2) Adjustment of the solution: adjust th...

Embodiment 2

[0051] The high temperature resistant thickener in this example is copolymerized by four monomers of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and sodium p-acrylbenzenesulfonate in an aqueous solution with a pH value of 7. Formed, wherein the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to sodium p-propenylbenzenesulfonate is 5:1, acrylic acid, acrylamide and 2-acrylamido-2-methylpropane The mass ratio of the mixture of sulfonic acid and sodium p-propenylbenzenesulfonate is 1.5:10:2.

[0052] The preparation method of high temperature resistant thickener in the present embodiment, comprises the following steps:

[0053] (1) Preparation of the solution: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 25%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 7 under stirring conditions, and continue to stir and mature for 30 minutes ;

[0054] (2) ...

Embodiment 3

[0058] The high temperature resistant thickener in this example is copolymerized by four monomers of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and sodium p-vinylbenzenesulfonate in an aqueous solution with a pH value of 8. Made, wherein the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid to sodium p-vinylbenzenesulfonate is 8:1, acrylic acid, acrylamide and 2-acrylamido-2-methylpropanesulfonate The mass ratio of acid and sodium p-vinylbenzenesulfonate mixture is 1:15:4.

[0059] The preparation method of high temperature resistant thickener in the present embodiment, comprises the following steps:

[0060] (1) Preparation of the solution: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 40%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 7 under stirring conditions, continue to stir and mature for 30 minutes ;

[0061] (2) Adjustment of the sol...

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