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

A thickening agent and high temperature resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of thermal stability, poor compatibility of salt-resistant formation water, and achieve good compatibility, excellent gel breaking performance, Good sand-carrying performance

Active Publication Date: 2016-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyethylene oxide thickeners were developed abroad in the late 1990s, and it was reported that polyvinylamine (VAM) water-soluble polymers such as polyvinyl formamide and polyvinyl acetamide were used as fracturing fluid thickeners , its main features are strong acid resistance, calcium salt resistance, and good temperature resistance, which can be used for acid fracturing at higher temperatures, but its thermal stability, salt resistance, and poor compatibility with formation water

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

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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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F212/14C08F220/06C08F220/56C08F4/40C09K8/68
Inventor 刘欣刘洪涛贾跃立常李博李梦楠蒋尔梁解勇珍许连洁孙彬峰
Owner CHINA PETROLEUM & CHEM CORP
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