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Preparation method of high-salt resistance high-viscosity sodium carboxymethylcellulose

A sodium carboxymethyl cellulose, high-viscosity technology, used in earth-moving drilling, production fluids, wellbore/well components, etc., can solve problems such as poor salt resistance, reduce energy, increase viscosity, and reduce friction force effect

Active Publication Date: 2014-06-18
CHANGSHU WEIYI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sodium carboxymethylcellulose with good salt resistance produced by kneading method in China can only measure the viscosity of 1% aqueous solution on Brookfield LVDV-I+ viscometer to about 3000mpa s, while the viscosity of 1% aqueous solution is above 6000mpa s The salt tolerance of sodium carboxymethyl cellulose is not good. At present, domestic manufacturers of sodium carboxymethyl cellulose have not been able to break through this technical limitation.

Method used

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  • Preparation method of high-salt resistance high-viscosity sodium carboxymethylcellulose

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preparation example Construction

[0015] see figure 1 . The preparation method of the high-salt-resistant high-viscosity sodium carboxymethyl cellulose described in this specific embodiment uses refined cotton as the cellulose raw material, comprising the following steps:

[0016] 1) Premixing: pre-mix a certain amount of sodium hydroxide solution with a weight concentration of 45-52% and an ethanol solution with a weight concentration of 86-96% in a mixing container at a weight ratio of 1:1-3, and cool to 10-30°C.

[0017] 2) Feeding: Add the premixed sodium hydroxide ethanol solution into a kneader with a pair of "S" shaped shafts that rotate in opposite directions along the axis, and evenly put the shredded refined cotton into the kneader Among them, the feeding time is 5~15min, and the average degree of polymerization of refined cotton is 3000~3300. The weight ratio of refined cotton to sodium hydroxide solution is controlled at 1:1-3, and the weight ratio to ethanol solution is 1:1.2-5.

[0018...

Embodiment 1

[0026] In advance, mix 1.35 parts of sodium hydroxide solution with a weight concentration of 49% and 1.6 parts of an ethanol solution with a weight concentration of 92% and cool it below 25°C, add it to the kneader, and then put 1 part of special refined cotton into it. Finally, the feeding port of the kneader is closed, and nitrogen gas is charged until the alkalization is completed. The alkalization reaction takes 30-70 minutes, and the alkalization temperature is controlled at 15-30°C. After the alkalization is completed, 1.08 parts of chloroacetic acid solution with a weight concentration of 65-78% is added for etherification for 30-60 minutes, and the etherification temperature is controlled at 30 -50°C. After the addition of chloroacetic acid, the temperature is raised to 75-80°C, and the etherification is continued for 40-80 minutes. After the etherification is completed, the material is discharged and the pH is neutralized to 6.5-7.5. After washing and refining, eth...

Embodiment 2

[0028] Mix 1.4 parts of sodium hydroxide solution with a weight concentration of 50% and 1.7 parts of an ethanol solution with a weight concentration of 94% in advance and cool it to below 25°C, add it to the kneader, and then put 1 part of special refined cotton into it. Finally, the feeding port of the kneader is closed, and nitrogen gas is charged until the alkalization is completed. The alkalization reaction takes 30-70 minutes, and the alkalization temperature is controlled at 15-30°C. After the alkalization is completed, 1.1 parts of chloroacetic acid solution with a weight concentration of 65-78% is added for etherification for 30-60 minutes, and the etherification temperature is controlled at 30 -50°C. After the addition of chloroacetic acid, the temperature is raised to 75-80°C, and the etherification is continued for 40-80 minutes. After the etherification is completed, the material is discharged and the pH is neutralized to 6.5-7.5. After washing and refining, eth...

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Abstract

The invention discloses a preparation method of high-salt resistance high-viscosity sodium carboxymethylcellulose. The method takes refined cotton as a cellulose raw material and comprises the steps of alkalization of cellulose and etherification of alkali cellulose, and is characterized in that the average degree of polymerization of the refined cotton is 3,000-3,300. The method disclosed by the invention takes the tailor-made refined cotton with high degree of polymerization as a cellulose raw material, adopts proper temperature control and adds nitrogen in alkalization reaction; and through the effective means of reasonable design of technological formula and technological time and the like, the viscosity of the product reaches over 6,000 mpa.s in 1% aqueous solution, the salinity-viscosity ratio is greater than or equal to 0.90, and the substitution ratio is greater than or equal to 0.90 according to the measurement by a Brookfield LVDV-I+ type viscometer. Through the preparation method disclosed by the invention, the prepared high-salt resistance high-viscosity sodium carboxymethylcellulose can substitute for guar gum, and is applied to a high-pressure hydrofracturing method for extracting oil gas from oil shale. The high-salt resistance high-viscosity sodium carboxymethylcellulose can be used for improving the viscosity of a proppant and can be pressed into a shale gap to expand the crack for the extraction of petroleum and natural gas. The high-salt resistance high-viscosity sodium carboxymethylcellulose is also favorable for reducing the friction force, and the energy consumed for extraction can be reduced.

Description

technical field [0001] The invention relates to a preparation method of sodium carboxymethyl cellulose, in particular to a preparation method of sodium carboxymethyl cellulose with high salt resistance and high viscosity. Background technique [0002] Sodium carboxymethyl cellulose is a kind of anionic high molecular compound with good water solubility obtained after chemical modification of natural cellulose. It is usually made from short cotton linters or wood pulp, treated with sodium hydroxide and then etherified with chloroacetic acid. Sodium carboxymethyl cellulose can be used to protect oil wells in oil drilling as a mud stabilizer and water retention agent. It has a high slurry production capacity, and at the same time has the ability to reduce water loss in the mud, and has obvious effects on stabilizing and increasing production. Sodium carboxymethyl cellulose with high viscosity and high degree of substitution plays a huge role especially in mud with low density....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/12E21B43/26
Inventor 陈炳生徐斌
Owner CHANGSHU WEIYI TECH
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