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A kind of preparation method of instant hydroxypropyl guar gum

A technology of hydroxypropyl guar gum and instant type, which is applied in the field of preparation of instant type hydroxypropyl guar gum, can solve the problems of long preparation time, perishability, low dissolution rate of guar gum or guar gum derivatives, etc., and achieve Simplify the configuration of ground equipment, increase the scale and discharge capacity, and improve the effect of dissolution performance

Active Publication Date: 2016-12-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation method of guar gum fracturing fluid has the disadvantages of long preparation time and easy deterioration of the prepared liquid, which is mainly caused by the low dissolution rate of guar gum or guar gum derivatives

Method used

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  • A kind of preparation method of instant hydroxypropyl guar gum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method proceeds as follows:

[0022] a. Add 100 parts by weight of melon collagen powder and 50 parts by weight of industrial methanol in the autoclave at room temperature, stir evenly, then add 10 parts by weight of aqueous sodium hydroxide solution with a mass concentration of 50% dropwise under stirring, soak the alkali 20min; then pass nitrogen to pressurize to 0.3MPa, then reduce to normal pressure, repeat 3 times;

[0023] b. Add 5 parts by weight of propylene oxide and 1 part by weight of potassium chloride to the alkalized guar gum dispersion under stirring, then pressurize to 0.1MPa with nitrogen gas and react at 80°C for 6h;

[0024] c. After the reaction, neutralize with hydrochloric acid to pH = 6, vacuum filter, wash with methanol, dry and pulverize to obtain the product.

Embodiment 2

[0026] The method proceeds as follows:

[0027] a. Add 100 parts by weight of melon collagen powder and 300 parts by weight of industrial methanol in the autoclave at room temperature, stir evenly, then add 50 parts by weight of aqueous sodium hydroxide solution dropwise with a mass concentration of 20% under stirring, soak the alkali 100min; then pass nitrogen to pressurize to 0.5MPa, then reduce to normal pressure, repeat 3 times;

[0028] b. Add 20 parts by weight of propylene oxide and 5 parts by weight of potassium chloride to the basified guar gum dispersion under stirring, then pressurize to 0.4 MPa with nitrogen gas and react at 25 °C for 4 hours;

[0029] c. After the reaction, neutralize with hydrochloric acid to pH=7, vacuum filter, wash with methanol, dry and pulverize to obtain the product.

Embodiment 3

[0031] The method proceeds as follows:

[0032] a. Add 100 parts by weight of melon collagen powder and 150 parts by weight of industrial methanol in the autoclave at room temperature, stir evenly, then add dropwise 30 parts by weight of aqueous sodium hydroxide solution with a mass concentration of 50% under stirring, soak the alkali 60min; then pass nitrogen to pressurize to 0.4MPa, then reduce to normal pressure, repeat 3 times;

[0033] b. Add 10 parts by weight of propylene oxide and 2 parts by weight of potassium chloride to the alkalized guar gum dispersion under stirring, then pressurize to 0.2 MPa with nitrogen gas and react at 50°C for 5 hours;

[0034] c. After the reaction, neutralize with hydrochloric acid to pH=6.5, vacuum filter, wash with weak polar or non-polar solvent, dry and pulverize to obtain the product.

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Abstract

The invention provides a preparation method of instant hydroxypropyl guar. The method comprises the following steps: a, adding 100 parts by weight of raw guar powder and 50 to 300 parts by weight of weak-polar or non-polar solvent to a high-pressure reaction kettle under room temperature, uniformly agitating, then dropwise adding 10 to 50 parts by weight of basic catalyst aqueous solution at the mass concentration of 20 to 80% under agitating, and soaking and alkalifying for 20 to 100 minutes; b, adding 5 to 20 parts by weight of nonionic etherifying agent and 1 to 5 parts by weight of rate-accelerating additives to the alkalified guar dispersoid during agitating, charging nitrogen and pressurizing to be 0.1 to 0.4MPa, and reacting for 4 to 6 hours under the temperature of 25 to 80 DEG C; and c, neutralizing with acid until reaching pH (Power of Hydrogen) of 6 to 8 after the reaction is done, and then performing suction filtration, drying, and crushing to obtain the instant hydroxypropyl guar.

Description

technical field [0001] The invention relates to a preparation method of instant hydroxypropyl guar gum. Background technique [0002] Hydraulic fracturing is to use the surface high-pressure pump group to pump high-viscosity liquid (fracturing fluid) into the well with a displacement exceeding the absorption capacity of the formation, and to suppress high pressure at the bottom of the well. When the pressure overcomes the ground stress near the well wall and reaches the rock resistance After tensile strength, fractures are generated at the bottom of the well. Continue to inject the fracturing fluid with proppant, the fracture continues to extend, and the proppant is filled in the fracture. After the pump is stopped, due to the supporting effect of the proppant on the fracture, a long enough sand-filled fracture with a certain conductivity can be formed in the formation. The hydraulic fracturing stimulation technology of oil and gas wells is an effective method to transform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/00
Inventor 陈凯姜阿娜仲岩磊宋李煜左家强李爱山杨彪吕永利
Owner CHINA PETROLEUM & CHEM CORP
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