A kind of instant salt-resistant guar gum and preparation method thereof

A guar gum and salt-resistant technology, which is applied in the field of guar gum modification, can solve the problems of product development lag, unusability, and high environmental protection requirements

Active Publication Date: 2017-10-27
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most used fracturing thickener in my country's oilfields is also hydroxypropyl guar gum, but the existing hydroxypropyl guar gum is monohydroxypropyl guar gum, which has the defect of poor salt tolerance, so it cannot be used at high salinity. environment
[0005] At present, as many oilfields in my country enter the middle and late stages of development, the difficulty of crude oil recovery is increasing, and the requirements for environmental protection are getting higher and higher. Combining the excellent solubility of hydroxypropyl guar gum and the good salt tolerance of zwitterionic guar gum, a guar gum derivative with instant dissolution, high-efficiency thickening and salt tolerance was prepared

Method used

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  • A kind of instant salt-resistant guar gum and preparation method thereof
  • A kind of instant salt-resistant guar gum and preparation method thereof
  • A kind of instant salt-resistant guar gum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation method of instant salt-resistant guar gum of the present invention

[0026] (1) Put a 250ml single-necked round-bottom flask into an oil bath, add 10g of guar gum, 40g of absolute ethanol, 10g of pure water, and 0.5g of sodium hydroxide, and react for 0.5 h under uniform stirring for alkalization. Add 3g of propylene oxide and stir for 0.5h;

[0027] (2) Slowly drop 3g of N,N-dimethyl-3-chloropropylamine into the above single-necked round-bottomed flask, stir evenly, adjust the system to a pH value of not less than 8 with 2.5g of sodium hydroxide, and heat up to 50°C , condensed to reflux, and stirred for 2h;

[0028] (3) Dissolve 2.9g of sodium chloroacetate in 3g of water, 2g of sodium hydroxide in 2.5g of water, and slowly add to the mixture obtained in step (2) successively, heat up to 60°C, condense and reflux, and stir for 2h. Use 3-4g of glacial acetic acid to adjust the pH of the system to neutral, wash with 60% ethanol-water mixed solution, filter...

Embodiment 2

[0030] Preparation method of instant salt-resistant guar gum of the present invention

[0031] (1) Put a 250ml single-necked round-bottom flask into an oil bath, add 10g of guar gum, 42g of absolute ethanol, 18g of pure water, and 0.5g of sodium hydroxide, and react for 1 h under uniform stirring for alkalization. Add 3.5g of propylene oxide and stir for 1h;

[0032] (2) Slowly drop 3.5g of N,N-dimethyl-3-chloropropylamine into the above-mentioned single-necked round-bottomed flask, stir well, adjust the system to a pH value of not less than 8 with 3.0g of sodium hydroxide, and raise the temperature to 50°C , condensed to reflux, and stirred for 2.5 hours;

[0033] (3) Dissolve 4.1g of sodium chloroacetate in 4g of water, and 2.5g of sodium hydroxide in 3g of water, and slowly add to the mixture obtained in step (2) successively, heat up to 60°C, condense and reflux, and stir for 2.5h. Use 3-4g of glacial acetic acid to adjust the pH of the system to neutral, wash with 60% e...

Embodiment 3

[0035] Preparation method of instant salt-resistant guar gum of the present invention

[0036] (1) Put a 250ml single-necked round bottom flask into an oil bath, add 10g of guar gum, 40g of absolute ethanol, 10g of pure water, and 0.5g of sodium hydroxide, and react for 0.5h under uniform stirring for alkalization. Add 1g of propylene oxide and stir for 0.5h;

[0037] (2) Then slowly drop 3.2g of N,N-dimethyl-3-chloropropylamine into the above-mentioned single-necked round-bottomed flask, stir well, adjust the system with sodium hydroxide to a pH value of not less than 8, and raise the temperature to 30°C. Condensate and reflux, stir and react for 2h;

[0038] (3) Dissolve 3.1g of sodium chloroacetate in 3.0g of water, dissolve 2.6g of sodium hydroxide in 3.1g of water, slowly add to the mixture obtained in step (2) successively, heat up to 50°C, condense and reflux, and stir for 2 hours . Adjust the pH of the system to neutral with glacial acetic acid, wash with 60% ethano...

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Abstract

An instant salt-resistant guar gum and a preparation method thereof relate to a modification method of guar gum. Aiming at the defect that the existing guar gum cannot satisfy the solubility and salt tolerance at the same time during preparation, an instant salt-tolerant guar gum with good solubility and salt tolerance and a preparation method thereof are provided. The method includes the following three steps: (1) Add guar gum to alcohol-water mixed solvent, alkalinize at room temperature for 0.5-2 hours, then add alkylene oxide, and stir for 0.5-2 hours; (2) Add N,N-dimethyl- 3-Chloropropylamine, adjust the pH value to ≥8, heat up to 30-50°C to condense and reflux for 2h-4h; (3) add sodium chloroacetate and sodium hydroxide, condense and reflux at 50-70°C for 2h-4h, and cool the product to room temperature, adjust the pH to 7, wash, filter with suction, and dry to obtain instant salt-resistant guar gum. The preparation method has mild conditions and simple operation process, and the prepared instant salt-resistant guar gum has a fast dissolution speed and good viscosity performance in salt water.

Description

technical field [0001] The invention relates to a method for modifying guar gum. Background technique [0002] Guar gum has good water solubility and thickening properties, will not pollute the environment, and has a wide range of applications. In petroleum industry, it can be used as fracturing fluid thickener and drilling fluid suspension agent; in food industry, it can be used as thickener, water-holding agent and moisturizing agent; in textile industry, it can be used as printing paste; it can also be used as pharmaceutical Drug carrier in the field of medicine, paper strengthening agent in the paper industry, flotation agent in the mineral processing industry, cementing agent in the explosives industry, etc. However, guar gum has a high water-insoluble content, a slow dissolution rate in water, no rapid swelling and hydration, and poor electrolyte resistance. In order to improve the properties of guar gum, a lot of research has been done on the chemical modification o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/00
Inventor 吕雷王梓民张淑侠刘立张世君杨志刚李辉司小明魏彦林南蓓蓓封子艳王珂尹志福马彬
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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