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Preparation method of amphoteric cellulose ether for drilling fluid

An amphoteric cellulose and drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as poor salt tolerance and poor water loss reduction effect, achieve excellent water loss reduction and improve coalescence The effect of improving stability and exercise resistance

Inactive Publication Date: 2018-06-15
江苏华友装饰工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved by the present invention is to provide a preparation method of amphoteric cellulose ether for drilling fluid, aiming at the defects of poor water loss reduction effect and poor salt tolerance when cellulose ether is used in drilling fluid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026]Add 150mL epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 40mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate and react for 4 hours to obtain a reaction product, filter and separate the reaction product to obtain a white solid product, put the white solid product in a vacuum drying oven with a set temperature of 70°C, and dry for 6 hours to obtain a cationic etherification agent Add 30g hydroxyethyl cellulose, 120mL mass fraction of 15% sodium hydroxide solution and 8g cationic etherification agent in the reactor, start the stirrer, stir and react with the rotating speed of 400r / min for 1h, obtain the reaction mixture, use The hydrochloric acid with a mass fraction of 20% neutralizes the reaction mixture to obtain a suspension, and the suspension is placed in a high-speed centrifuge at a speed of 2...

example 2

[0028] Add 155mL of epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 45mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate and react for 4.5 hours to obtain a reaction product, filter and separate the reaction product to obtain a white solid product, put the white solid product in a vacuum drying oven with a set temperature of 75°C, and dry for 6.5 hours to obtain a cationic etherification Add 32g of hydroxyethyl cellulose, 130mL of 15% sodium hydroxide solution and 9g of cationic etherification agent into the reactor, start the agitator, and stir the reaction at a speed of 450r / min for 1.5h to obtain a reaction mixture , neutralize the reaction mixture with hydrochloric acid with a mass fraction of 20%, to obtain a suspension, place the suspension in a high-speed centrifuge and centrifuge at a speed of 250...

example 3

[0030] Add 160mL of epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 50mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate and react for 5 hours to obtain a reaction product, filter and separate the reaction product to obtain a white solid product, put the white solid product in a vacuum drying oven with a set temperature of 80°C, and dry for 7 hours to obtain a cationic etherification agent Adding 35g hydroxyethyl cellulose, 140mL mass fraction of 15% sodium hydroxide solution and 10g cationic etherification agent in the reactor, start the stirrer, stir and react for 2h with the rotating speed of 500r / min, obtain the reaction mixture, use The hydrochloric acid with a mass fraction of 20% neutralizes the reaction mixture to obtain a suspension, and the suspension is placed in a high-speed centrifuge at a sp...

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Abstract

The invention discloses a preparation method of amphoteric cellulose ether for drilling fluid, and belongs to the technical field of cellulose ether preparation. The preparation method comprises the steps: firstly, under an alkaline condition, cationic hydroxyethyl cellulose ether is obtained by etherification reaction of active hydroxyl on a molecular chain of hydroxyethyl cellulose and epoxy chloropropane, and then a viscous filtrate, namely 3-chloro-2-hydroxypropyl dimethylammonium acetate, is prepared, so that the motion resistance of water molecules is increased, and the cellulose ether has an excellent water loss reduction function in the drilling fluid; the number of anion groups in the amphoteric cellulose ether and the number of cation groups in the amphoteric cellulose ether areroughly equal, the electrostatic interaction force in the molecular chain is only electrostatic attraction force, resulting in contraction of polymer molecules, decrease of the hydrodynamic volume anddecrease of the viscosity of a solution, so an obvious antipolyelectrolyte solution behavior is showed, a large consistence can be still kept when the water content in the drilling fluid is high, andthe permeability of a salt solution is weakened, so the salt tolerance of the amphoteric cellulose ether in the drilling fluid is improved, and the prospect of application is broad.

Description

technical field [0001] The invention discloses a method for preparing amphoteric cellulose ether for drilling fluid, and belongs to the technical field of cellulose ether preparation. Background technique [0002] Cellulose ether is a polymer compound with an ether structure made from cellulose. Each glucosyl ring in the cellulose macromolecule contains three hydroxyl groups, the primary hydroxyl group on the sixth carbon atom, the secondary hydroxyl group on the second and third carbon atoms, and the hydrogen in the hydroxyl group is replaced by a hydrocarbon group to generate cellulose ether derivatives things. It is a product in which the hydrogen of the hydroxyl group in the cellulose polymer is replaced by a hydrocarbon group. Cellulose is a polyhydroxy polymer compound that neither dissolves nor melts. After etherification, cellulose is soluble in water, dilute alkali solution and organic solvent, and has thermoplasticity. [0003] According to the chemical structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/14C08B11/08C09K8/035
CPCC08B11/08C08B11/14C09K8/035
Inventor 王国峰何少雄陈可
Owner 江苏华友装饰工程有限公司
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