Guar gum derivative and preparation method and application thereof

A guar gum derivative, guar gum technology, applied in the field of petroleum fracturing, can solve the problem of low cross-linking strength, and achieve the effect of high cross-linking strength and stable jelly

Active Publication Date: 2021-07-09
昆山京昆油田化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing water-based fracturing fluid thickeners using guar gum and its derivatives have the problem of low crosslinking strength

Method used

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  • Guar gum derivative and preparation method and application thereof
  • Guar gum derivative and preparation method and application thereof
  • Guar gum derivative and preparation method and application thereof

Examples

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preparation example Construction

[0038] The present invention also provides the preparation method of the guar gum derivative described in above-mentioned technical scheme, comprises the following steps:

[0039] After mixing guar gum, borax and a solvent, they are mixed with an alkaline reagent under a protective atmosphere for alkalization to obtain a guar gum suspension;

[0040] The guar gum suspension is subjected to a two-step etherification reaction with a first etherification agent and a second etherification agent to obtain the guar gum derivative, and the first etherification agent is C1-C5 epoxy Alkanes, the second etherifying agent is halogenated dicarboxylic acid sodium salt or halogenated dicarboxylic acid ester; the sequence of etherification reaction between the first etherifying agent and the second etherifying agent is not limited.

[0041] In the invention, the guar gum, borax and solvent are mixed, and then mixed with an alkaline reagent in a protective atmosphere to carry out alkalization...

Embodiment 1

[0075] Add 100g of guar gum, 1.5g of borax and 200g of isopropanol into a three-necked flask, stir with nitrogen gas at room temperature for 30min, add dropwise 50wt% sodium hydroxide solution 35g under nitrogen protection, dropwise for 30min, and directly raise the temperature to 70 ℃, add 10g of propylene oxide dropwise, stir and react for 2h, discharge the material, wash once with suction filtration water, wash twice with alcohol water, and dry to obtain the reaction intermediate. Take 50g reaction intermediate, 45g sodium chloromalonate, 0.8g Add borax into a three-necked flask, pour 100g of isopropanol, and pass through nitrogen to stir and disperse for 30 minutes to make the mixture uniform, raise the temperature to 50°C, and add 30g of 50wt% sodium hydroxide solution dropwise in a nitrogen-protected environment. After the dropwise addition, the material was discharged after 1 hour of reaction, washed once with suction filtration water, washed twice with alcohol water and...

Embodiment 2

[0081] Add 100g of guar gum, 1.5g of borax and 200g of isopropanol into a three-necked flask, stir with nitrogen gas at room temperature for 30min, add dropwise 50wt% sodium hydroxide solution 35g under nitrogen protection, dropwise for 30min, and directly raise the temperature to 70 ℃, add 10g of propylene oxide dropwise, stir and react for 2h, discharge the material, wash once with suction filtration water, wash twice with alcohol water, and dry to obtain the reaction intermediate. Take 50g reaction intermediate, 28g sodium chloromalonate, 0.8g Add borax into a three-necked flask, pour 100g of isopropanol, and stir and disperse for 30 minutes with nitrogen gas to make the mixture uniform. Heat up to 50°C. Under nitrogen protection environment, add 20g of 50wt% sodium hydroxide solution dropwise, drop slowly, and add time After the dropwise addition, the material was discharged after 1 hour of reaction, washed once with suction filtration water, washed twice with alcohol water...

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Abstract

The invention provides a guar gum derivative and a preparation method and application thereof, and belongs to the technical field of petroleum fracturing. The guar gum derivative not only contains hydroxyalkyl, but also contains a dicarboxyl structural group, the hydroxyalkyl and the dicarboxyl structural group both can appear at positions 2, 3 and 6 in mannose and positions 2, 3, 4 and 6 in galactose, and the dicarboxyl group is introduced, so that the density of crosslinkable sites is higher, the crosslinking strength is higher, under the combined action of hydroxyalkyl and dicarboxyl structural groups, the guar gum derivative not only has excellent properties of fast tackifying and shear resistance, but also can generate a cross-linked network with higher density with zirconium and aluminum cross-linking agents under a low-concentration condition, so that jelly is more stable, and the cross-linking strength is higher.

Description

technical field [0001] The invention relates to the technical field of petroleum fracturing, in particular to a guar gum derivative and a preparation method and application thereof. Background technique [0002] Water-based fracturing fluids have been widely used in the oil and gas industry because of their low cost, good performance and easy handling. The main work of water-based fracturing fluid research is to develop and optimize thickeners and cross-linking agents, among which the research on thickeners is the core project. Thickener is the main functional agent in water-based fracturing fluid. The performance of the thickener directly affects the performance of water-based fracturing fluid. Currently, the most widely used water-based fracturing fluid thickener is guar Gum and its derivatives, the structural formula of guar gum is as follows: [0003] [0004] The existing water-based fracturing fluid thickeners using guar gum and its derivatives have the problem of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C09K8/68C09K8/88C09K8/90
CPCC08B37/0096C09K8/68C09K8/685C09K8/887C09K8/885C09K8/90
Inventor 李博彭树华邓明宇陈家宝陆伟孙雪莲谢文龙王军民
Owner 昆山京昆油田化学科技有限公司
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