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Hydrophobic-association-type guanidine gum used for fracturing fluid and preparation method of hydrophobic-association-type guanidine gum

A hydrophobic association, fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as low viscosity and poor shear resistance, and achieve good technical effects and viscosity increase.

Active Publication Date: 2018-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is the low viscosity and poor shear resistance of conventional guar gum solutions in the prior art. A hydrophobic association type guar gum for fracturing fluid is provided, which is connected through molecular chains. Branches form hydrophobic association side groups, and then introduce hydrophobic association structures into its aqueous solution to form hydrophobic association microdomains to increase the viscosity of the solution, and at the same time increase the shear resistance of the solution through the introduction of hydrophobic association microdomains

Method used

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  • Hydrophobic-association-type guanidine gum used for fracturing fluid and preparation method of hydrophobic-association-type guanidine gum
  • Hydrophobic-association-type guanidine gum used for fracturing fluid and preparation method of hydrophobic-association-type guanidine gum
  • Hydrophobic-association-type guanidine gum used for fracturing fluid and preparation method of hydrophobic-association-type guanidine gum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Disperse 40 parts of hydroxypropyl guar gum in 100 parts of cyclohexane, stir and disperse at 500 r / min, and pass through inert gas protection. Dissolve 5 parts of acrylamide, 0.4 parts of 2-acrylamide sodium dodecylsulfonate, 0.5 parts of 2-acrylamide-2-methylpropanesulfonic acid, 2 parts of Span 80, and 0.05 parts of Tween 60 in 40 parts Prepare an aqueous solution in water and adjust the pH value to 9.0. Slowly add the aqueous monomer solution into the reaction kettle dropwise at a rate of 1 mL / min. Stirring was continued for 2 hours, and the jacket temperature of the reactor was controlled at 30°C. Prepare an aqueous solution of 0.05 parts of ceric ammonium nitrate in 10 parts of deionized water, and slowly drop it into the reaction kettle at a rate of 0.5 mL / min. At 30°C, pass inert gas protection and stir, react for 60 minutes, then raise the temperature to 60°C and continue the reaction for 60 minutes. The reaction product is taken out, centrifuged, dried, and ...

Embodiment 2

[0045] Disperse 40 parts of hydroxypropyl guar gum in 100 parts of cyclohexane, stir and disperse at 500 r / min, and pass through inert gas protection. Dissolve 5 parts of acrylamide, 0.4 part of dodecyldimethylallyl ammonium chloride, 0.5 part of 2-acrylamide-2-methylpropanesulfonic acid, 2 parts of Span 80, and 0.05 part of Tween 60 in Prepare an aqueous solution with 40 parts of water, and adjust the pH value to 9.0. Slowly add the aqueous monomer solution into the reaction kettle dropwise at a rate of 1ml / min. Stirring was continued for 2 hours, and the jacket temperature of the reactor was controlled at 30°C. Prepare an aqueous solution of 0.05 parts of ceric ammonium nitrate in 10 parts of deionized water, and slowly drop it into the reaction kettle at a rate of 0.5 ml / min. At 30°C, pass inert gas protection and stir, react for 60 minutes, then raise the temperature to 60°C and continue the reaction for 60 minutes. The reaction product is taken out, centrifuged, dried,...

Embodiment 3

[0048] Disperse 40 parts of hydroxypropyl guar gum in 100 parts of cyclohexane, stir and disperse at 500 r / min, and pass through inert gas protection. Dissolve 5 parts of acrylamide, 0.4 part of N-dodecylacrylamide, 0.5 part of 2-acrylamide-2-methylpropanesulfonic acid, 2 parts of Span 80, and 0.05 part of Tween 60 in 40 parts of water to prepare Aqueous solution, adjust the pH value to 9.0. Slowly add the aqueous monomer solution into the reaction kettle dropwise at a rate of 1ml / min. Stirring was continued for 2 hours, and the jacket temperature of the reactor was controlled at 30°C. Prepare an aqueous solution of 0.05 parts of ceric ammonium nitrate in 10 parts of deionized water, and slowly drop it into the reaction kettle at a rate of 0.5 ml / min. At 30°C, pass inert gas protection and stir, react for 60 minutes, then raise the temperature to 60°C and continue the reaction for 60 minutes. The reaction product is taken out, centrifuged, dried, and pulverized for later us...

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Abstract

The invention relates to hydrophobic-association-modified guanidine gum, mainly solving the technical problem that in the prior art a conventional guanidine gum solution is low in viscosity and poor in shearing resistance. The hydrophobic-association-type guanidine gum used for a fracturing fluid is made via a reaction system comprising, by weight, (1) 30-50 parts of hydroxypropyl guanidine gum, (2) 0.05-0.5 part of a hydrophobic monomer, (3) 0.1-5 parts of an ionic monomer, and (4) 0.1-5 parts of a nonionic monomer. According to the technical scheme, the problem is well solved. The hydrophobic-association-type guanidine gum can be used to oil field fracturing technology.

Description

technical field [0001] The invention relates to a method for hydrophobically modifying guar gum, in particular to a method for hydrophobically modifying guar gum to obtain a hydrophobic association type guar gum for fracturing construction in oil fields. Background technique [0002] Fracturing is an important means of improving oil recovery in oil fields. With the further development of oil fields, most oil fields in my country need to undergo fracturing reconstruction, and fracturing is one of the core technologies in the mining process of unconventional oil and gas fields. [0003] Fracturing fluid is an important part of fracturing technology, and galactomannan, commonly known as guar gum, is one of the important components in fracturing fluid. However, with the development of oil and gas exploration and development toward deep layers, the guar gum used at present can no longer meet the actual use requirements. For example, even if the water-insoluble content of hydroxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88C08F251/00C08F220/56C08F220/58C08F226/02C08F220/54
CPCC08F251/00C09K8/68C09K8/88C08F220/56C08F220/585C08F226/02C08F220/54
Inventor 苏智青夏燕敏许汇宋晓芳朱益兴王兰
Owner CHINA PETROLEUM & CHEM CORP
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