Method for preparing guanidine-gum fracturing-liquid nanometer cross-linking agent

A guar gum fracturing fluid and cross-linking agent technology, applied in the field of nanomaterials, can solve the problems of substandard temperature resistance and shear resistance residue content, poor temperature resistance and shear resistance, and increased flowback difficulty, etc. Excellent overall cross-linking performance, good temperature resistance and low cost

Active Publication Date: 2016-07-06
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The water-based natural plant gum fracturing fluid uses inorganic boron as the cross-linking agent, which has problems such as low cross-linking efficiency, too fast cross-linking speed, poor temperature resistance and shear resistance, etc. The diversion ability will cause damage, and incomplete gel breaking will also increase the difficulty of flowback, resulting in limited use
[0003] For the problems existing in boron cross-linking agents, the commonly used solution is to carry out organic compounding or use transition metal and organometallic cross-linking agents as substitutes. Its comprehensive cross-linking performance is better than boric acid, but it is also To varying degrees, there are problems such as too fast cross-linking, temperature resistance and shear resistance, gel breaking, residue content and other performances that are not up to standard

Method used

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  • Method for preparing guanidine-gum fracturing-liquid nanometer cross-linking agent
  • Method for preparing guanidine-gum fracturing-liquid nanometer cross-linking agent
  • Method for preparing guanidine-gum fracturing-liquid nanometer cross-linking agent

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Embodiment 1

[0021] A preparation method of guar gum fracturing fluid nano-crosslinking agent, comprising the following steps:

[0022] (1) Prepare a sodium silicate solution with a mass fraction of 48.8%, take 50g of a sodium silicate solution with a mass fraction of 48.8%, and another 4.5g of γ-aminoethylaminopropyltrimethoxysilane, and add them to 150ml In ethanol, add dilute hydrochloric acid dropwise to adjust the pH to 11, heat up to 60°C, keep stirring for 3 hours, then filter, wash with deionized water, and rinse with xylene to obtain a reactive nano-silica filter cake, which can be reacted The solid content of the nano-silica filter cake is 20%;

[0023] (2) Weigh 60 grams of the reactive nano-silica filter cake obtained in step (1), add it to 50 milliliters of xylene, heat up to 50°C, keep stirring for 0.5 hours, add 3 grams of boric acid and heat up to 110°C , keep stirring for 2 hours;

[0024] (3) Filter the product obtained in step (2), wash with ethanol, and then dry at 10...

Embodiment 2

[0030] A preparation method of guar gum fracturing fluid nano-crosslinking agent, comprising the following steps:

[0031] (1) Configure a sodium silicate solution with a mass fraction of 30%, take 60 grams of a sodium silicate solution with a mass fraction of 30%, and take another 4 grams of anilinomethyltriethoxysilane and 1 gram of hexamethyldisilane Azane was added to a mixture of 150 milliliters of deionized water and 20 milliliters of ethanol, dilute hydrochloric acid was added dropwise to adjust the pH to 9, the temperature was raised to 70°C, and kept stirring for 5 hours, then filtered, washed with deionized water, and free Rinse with water and ethanol to obtain a reactive nano-silica filter cake, and the solid content of the reactive nano-silica filter cake is 24%;

[0032] (2) Weigh 50 grams of the reactive nano-silica filter cake obtained in step (1), add 100 milliliters of toluene and ethanol mixture, heat up to 50 ° C, keep stirring for 0.5 hours, add 1.2 grams o...

Embodiment 3

[0038]A preparation method of guar gum fracturing fluid nano-crosslinking agent, comprising the following steps:

[0039] (1) Configure a sodium silicate solution with a mass fraction of 40%, take 25 grams of a sodium silicate solution with a mass fraction of 40%, add 150 ml of deionized water and 20 ml of ethanol to the mixture, add dilute sulfuric acid dropwise to adjust the pH To 10, add 3.5 grams of γ-aminopropyltrimethoxysilane, raise the temperature to 80 ° C, keep stirring for 9 hours, then filter, wash with deionized water, and rinse with acetone to obtain a reactive nano-silica filter cake , the solid content of the reactive nano silica filter cake is 15%;

[0040] (2) Weigh 60 grams of the reactive nano-silica filter cake obtained in step (1), add it to 50 milliliters of acetone, heat up to 50 ° C, keep stirring for 1 hour, add 4.5 grams of boric acid and heat up to 105 ° C, Insulated and stirred for 3 hours;

[0041] (4) Filter the product obtained in step (3), wa...

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Abstract

The invention discloses a method for preparing a guanidine-gum fracturing-liquid nanometer cross-linking agent.The method includes the steps that sodium silicate serves as a silicon source to be hydrolyzed, surface modification is carried out with an organic silicon modifier, reactive nanometer silicon dioxide is prepared, and boric acid is loaded on the surface of the reactive nanometer silicon dioxide.According to the method, the raw materials are low in cost, the preparation technology is simple, and the cross-linking time can be controlled by adjusting the content of surface amido and the loading capacity of the boric acid; as cross-linking time is delayed, frictional resistance between fracturing liquid and a conveying pipe in the construction process can be reduced, and effective time is bought for construction while energy consumption is reduced; meanwhile, as the spatial size of the boric acid is increased, the cross-linking efficiency can be improved, the fracturing liquid has the good temperature resistance and the good shearing resistance accordingly, and gum breaking is complete.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of a guar gum fracturing fluid nano crosslinking agent. Background technique [0002] Water-based fracturing is an important technical measure for increasing production of oil and gas wells and increasing injection of water injection wells. The improvement of fracturing fluids has always been a subject of great concern. The water-based natural plant gum fracturing fluid uses inorganic boron as the cross-linking agent, which has problems such as low cross-linking efficiency, too fast cross-linking speed, poor temperature resistance and shear resistance, etc. The diversion ability will cause damage, and incomplete gel breaking will also increase the difficulty of flowback, resulting in limited use. [0003] For the problems existing in boron cross-linking agents, the commonly used solution is to carry out organic compounding or use transition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90
CPCC09K8/685C09K8/887C09K8/90C09K2208/26
Inventor 李小红张治军潘浩刘培松
Owner HENAN UNIVERSITY
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