Sulfonic acid modified carboxymethyl hydroxypropyl guar gum, and preparation method and application thereof

A carboxymethyl hydroxypropyl guar gum and a modification technology are applied in the field of sulfonic acid-modified carboxymethyl hydroxypropyl guar gum and its preparation, and can solve the problem of reducing the effect of oil and gas well reconstruction and high content of raw powder residues problem, to achieve the effect of good water solubility, saving dosage, and reducing the types of additives

Active Publication Date: 2013-05-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polymer thickeners for vegetable gum fracturing fluid systems mainly include guar gum, coumarin, cellulose and their chemically modified products (such as hydroxypropyl guar gum, carboxymethyl hydroxypropyl guar gum, etc.), Due to the high viscosity of guar gum, low price, simple on-site operation, and low friction, it is widely used in large areas. However, due to the high content of raw powder residue, reaching 19% to 28%, the gel-breaking residue and residual polymer of this type of fracturing fluid It can block the diversion channel formed by the proppant to varying degrees, reducing the effect of oil and gas well stimulation

Method used

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  • Sulfonic acid modified carboxymethyl hydroxypropyl guar gum, and preparation method and application thereof
  • Sulfonic acid modified carboxymethyl hydroxypropyl guar gum, and preparation method and application thereof
  • Sulfonic acid modified carboxymethyl hydroxypropyl guar gum, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A preparation method of organic sulfonic acid modified carboxymethyl hydroxypropyl guar gum, the steps are as follows:

[0059] (1) In the reactor that 3L65% ethanol solution is housed, add 1000.0g carboxymethyl hydroxypropyl guar gum (the degree of substitution of carboxymethyl is 0.19, the degree of substitution of hydroxypropyl is 0.28);

[0060] (2) Under a nitrogen atmosphere, add 150 g of 15% sodium hydroxide aqueous solution dropwise, stir for 0.5 hours, then heat up to 65-70° C., stir for 0.5 hours, add 68 g of vinylsulfonic acid dropwise, keep the temperature at 70° C., and complete the dropwise addition in 2 hours. Continue stirring for 4 hours;

[0061] (3) neutralize the reaction solution with hydrochloric acid to pH = 7, filter, and dry the solid product at 70°C to obtain the light yellow powder product SCMHPG;

[0062] In this structure R=H, n=0.

[0063] Determination of special performance indicators of products:

[0064] (1) Molecular weight determin...

Embodiment 2

[0082] A preparation method of organic sulfonic acid modified carboxymethyl hydroxypropyl guar gum, comprising the following steps successively:

[0083] (1) In the reactor that 3L65% isopropanol solution is housed, add 1000.0g carboxymethyl hydroxypropyl guar gum (the degree of substitution of carboxymethyl is 0.16, the degree of substitution of hydroxypropyl is 0.23);

[0084] (2) Under nitrogen atmosphere, 110g of 30% sodium hydroxide aqueous solution was added dropwise, and the temperature was raised to 80° C. after stirring for 0.5 hours, stirred for 0.5 hours, 250 g of 40% 3-chloro-2-hydroxypropanesulfonate aqueous solution was added dropwise, and kept The temperature is at 80°C, the dropwise addition is completed in 1.5 hours, and the stirring is continued for 5 hours;

[0085] (3) Neutralize the reaction solution with 5% hydrochloric acid to pH = 7, filter, and dry the solid product at 70°C to obtain a light yellow powder;

[0086] In this structure R=OH, n=1.

[008...

Embodiment 3

[0107] A preparation method of organic sulfonic acid modified carboxymethyl hydroxypropyl guar gum, the steps are as follows:

[0108] (1) In the reactor that 3L65% ethanol solution is housed, add 1000.0g carboxymethyl hydroxypropyl guar gum (the degree of substitution of carboxymethyl group is 0.12, the degree of substitution of hydroxypropyl group is 0.35);

[0109] (2) Under a nitrogen atmosphere, add dropwise 360 ​​g of 30% aqueous sodium hydroxide solution, stir for 0.5 hours and then heat up to 80° C., stir for 0.5 hour, add dropwise 650 g of 40% 3-chloro-2-hydroxypropanesulfonate aqueous solution, and keep The temperature is at 80°C, the dropwise addition is completed in 1.5 hours, and the stirring is continued for 5 hours;

[0110] (3) Neutralize the reaction solution with 5% citric acid to pH = 7, filter, and dry the solid product at 70°C to obtain the light yellow powder product SCMHPG;

[0111]In this structure R=OH, n=1.

[0112] Determination of special performa...

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Abstract

The invention relates to sulfonic acid modified carboxymethyl hydroxypropyl guar gum, and a preparation method and application thereof. The structural formula of the sulfonic acid modified carboxymethyl hydroxypropyl guar gum is shown in the specification, wherein R is H, and n is 0, 1, 2 or 3; or R is OH, and n is 0-6. The preparation method comprises the following steps: adding carboxymethyl hydroxypropyl guar gum into a reaction vessel, and adding an alcohol water solution; in a nitrogen atmosphere, dropwisely adding a sodium hydroxide water solution, heating to 65-80 DEG C while stirring, dropwisely adding a sulfonating agent, and reacting for 3-10 hours; and regulating the pH value of the solution to 7 with acid, filtering, collecting solids, and drying to obtain light yellow powder, namely the sulfonic acid modified carboxymethyl hydroxypropyl guar gum. The prepared sulfonic acid modified carboxymethyl hydroxypropyl guar gum is high in thickening efficiency, low in surface/interface tension, easy to realize viscosity break and beneficial to flowback.

Description

technical field [0001] The invention relates to a sulfonic acid modified carboxymethyl hydroxypropyl guar gum and its preparation method and application, and the application specifically refers to its use in preparing fracturing fluid. Background technique [0002] Polymer thickeners for plant gum fracturing fluid systems mainly include guar gum, coumarin, cellulose and their chemically modified products (such as hydroxypropyl guar gum, carboxymethyl hydroxypropyl guar gum, etc.), Due to the high viscosity of guar gum, low price, simple on-site operation, and low friction, it is widely used in large areas. However, due to the high content of raw powder residue, reaching 19% to 28%, the gel-breaking residue and residual polymer of this type of fracturing fluid It can block the diversion channels formed by the proppant to varying degrees, reducing the effect of oil and gas well stimulation. [0003] Sandstone reservoirs are generally anionic systems. The developed anionic veg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C09K8/68
Inventor 管保山彭树华赵文丁云宏何建平周晓群邓明宇梁利陈卫平卢拥军刘萍吕海燕邱晓慧
Owner PETROCHINA CO LTD
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