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Guar gum-nanometer cellulose fiber cross-linked thickener for fracturing fluid and preparation method thereof

A technology of nanocellulose and guar gum, which is applied in the field of oil production fracturing, can solve the problems of high temperature consistency loss and poor temperature resistance of guar gum, and achieve the effect of improving temperature resistance and strengthening the strength of network structure

Active Publication Date: 2021-05-14
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to provide a kind of guar gum-nanometer cellulose fiber crosslinking thickener and preparation method for fracturing fluid, the thickener that makes has stronger network structure strength, and temperature resistance is strong, to solve Guar gum in the current fracturing fluid has poor temperature resistance and high viscosity loss at high temperature.

Method used

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  • Guar gum-nanometer cellulose fiber cross-linked thickener for fracturing fluid and preparation method thereof
  • Guar gum-nanometer cellulose fiber cross-linked thickener for fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of pyridine cationic nanocellulose fibers:

[0035] (1) Clean the bagasse with deionized water, press it with a press after drying, and remove all the sugar in it several times in a row, dry it in an oven at 80°C for 6 hours, take it out, and crush it with a pulverizer to 800~ 1000 mesh bagasse powder; (2) add prepared 200g bagasse powder in a 2000mL three-neck round bottom flask, slowly add 1000g 98% concentrated sulfuric acid dropwise, stir and disperse at a speed of 300rpm until all the addition is completed, and continue stirring for 60min, Obtain milky white suspension; (3) add 20g trimethylacetyl chloride, 20g nitric acid and 30g dichloromethane successively in above-mentioned reactor, stir and disperse with 600rpm rotating speed for 60min; (4) adjust the pH of above-mentioned reactor to 7.5~ 8.0, add 20g of cetylpyridinium chloride, and continue to react for 60min; (5) transfer the above dispersion system to a centrifuge in batches, centrifuge at 1...

Embodiment 2

[0041] 1. Preparation of pyridine cationic nanocellulose fibers:

[0042] (1) Clean the bagasse with deionized water, press it with a press after drying, and remove all the sugar in it several times in a row, dry it in an oven at 80°C for 6 hours, take it out, and crush it with a pulverizer to 800~ 1000 mesh bagasse powder; (2) add prepared 250g bagasse powder in a 2000mL three-neck round bottom flask, slowly add 1100g 98% concentrated sulfuric acid dropwise, stir and disperse at a speed of 300rpm until all the addition is completed, and continue stirring for 70min, Obtain milky white suspension; (3) add 25g trimethylacetyl chloride, 40g nitric acid and 40g dichloromethane successively in above-mentioned reactor, stir and disperse with 600rpm rotating speed for 70min; (4) adjust the pH of above-mentioned reactor to 7.5~ 8.0, add 30g of heptadecanylaminopyridinium chloride, and continue to react for 70min; (5) Transfer the above dispersion system to a centrifuge in batches, and...

Embodiment 3

[0048] 1. Preparation of pyridine cationic nanocellulose fibers:

[0049] (1) Clean the bagasse with deionized water, press it with a press after drying, and remove all the sugar in it several times in a row, dry it in an oven at 80°C for 6 hours, take it out, and crush it with a pulverizer to 800~ 1000 mesh bagasse powder; (2) add prepared 300g bagasse powder in a 2000mL three-neck round bottom flask, slowly add 1200g 98% concentrated sulfuric acid dropwise, stir and disperse at a speed of 300rpm until all the addition is completed, and continue stirring for 80min. Obtain milky white suspension; (3) add 30g trimethylacetyl chloride, 50g nitric acid and 50g dichloromethane successively in above-mentioned reactor, stir and disperse with 600rpm rotating speed for 80min; (4) adjust the pH of above-mentioned reactor to 7.5~ 8.0, add 40g of benzylpyridinium chloride, and continue to react for 80min; (5) Transfer the above dispersion system to a centrifuge in batches, centrifuge at ...

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Abstract

A guar gum-nanocellulose fiber cross-linked thickener for fracturing fluid, which is composed of the following components in mass percentage: 79.37-80.00% of guar gum-pyridine type cationic nano-cellulose cross-linked product, fatty alcohol poly Vinyl ether 4.76-5.00%, acrylic acid 4.76-5.00%, p-toluenesulfonic acid 1.59-2.00%, nano silicon dioxide 8.00-9.52%. Guar gum-pyridine type cationic nanocellulose cross-linked product First dissolve guar gum with NaOH, add boric acid, isopropanol, and dodecane bromide, add pyridine type cationic nanocellulose fiber after reaction, and dry it; The thickener prepared by the invention has strong network structure strength and strong temperature resistance, so as to solve the problems of poor temperature resistance and high high-temperature consistency loss of guar gum in current fracturing fluids.

Description

technical field [0001] The invention belongs to the technical field of oil recovery fracturing, and in particular relates to a guar gum-nanometer cellulose fiber cross-linked thickener for fracturing fluid and a preparation method thereof. Background technique [0002] In the field of petroleum exploration, sometimes due to poor formation permeability or serious pollution, it is necessary to reconstruct high conductivity fractures, connect oil and gas layers, improve the flow environment of oil and gas in the formation, and increase the production of oil and gas wells. The fracturing fluid is a heterogeneous and unstable chemical system formed by various additives in a certain ratio. Its main function is to transmit the high pressure on the ground to the formation and transport the proppant to the fracture. In order to achieve effective transport during delivery, fracturing fluids are required to have high suspending capacity and high low-shear rate viscosity. In recent yea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/90C08F251/02C08F251/00C08F283/06C08F220/06
CPCC08F251/00C08F251/02C08F283/06C09K8/685C09K8/905C09K2208/10C08F220/06
Inventor 张妍刘平苏银河赵英渊谢彦解胜利邢雪阳
Owner BINZHOU UNIV
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