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Zwitterionic hydrophobic modified guar gum and preparation method thereof

An anionic guar gum and hydrophobic modification technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unfavorable rapid liquid preparation, reduced solubility, singleness, etc., and achieve increased viscosity and durability Temperature and salt resistance, good dispersibility, and simple process

Active Publication Date: 2020-07-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing conventional hydrophobically modified guar gum represented by the above-mentioned patent documents has only a single hydrophobic long chain added, and its solubility is greatly reduced, which is not conducive to rapid liquid preparation on the spot.

Method used

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  • Zwitterionic hydrophobic modified guar gum and preparation method thereof
  • Zwitterionic hydrophobic modified guar gum and preparation method thereof
  • Zwitterionic hydrophobic modified guar gum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) 85% ethanol aqueous solution is packed in the flask; 20g guar gum is added in the flask under stirring state, and the temperature is set as 60 ℃, add 1.2g triethylamine, stir 20-30min evenly; 4.8g Slowly add maleic anhydride into the flask, stir evenly, and react for 3-5 hours to obtain anionic guar gum.

[0042] (2) In the three-necked flask, nitrogen gas was passed for 10min; n-dodecanoic acid and 3-dimethylaminopropylamine were added to the flask according to the molar ratio of 1:1.1; in the flask, 0.5wt% KOH solution was added dropwise, and the temperature increased After reacting for 6 hours at 120°C, unreacted amine and generated water were distilled off under reduced pressure to obtain a tertiary amine product. Add absolute ethanol as solvent to a single-necked flask, raise the temperature to 70°C, then add the hydrophobic chain to epichlorohydrin in a molar ratio of 1:1.1 to the flask, install a reflux tube, react for 10 hours, and then remove the solvent by...

Embodiment 2

[0045] (1) The preparation method of anionic guar gum is as in Example 1.

[0046] (2) Nitrogen 5min is passed in the three-necked flask, and n-tetradecanoic acid and 3-dimethylaminopropylamine are added into the flask according to a molar ratio of 1:1.1; 0.5wt% KOH solution is added dropwise in the flask, and the temperature rises After reacting for 6 hours at 170°C, unreacted amine and generated water were distilled off under reduced pressure to obtain a tertiary amine product. Add absolute ethanol as solvent to a single-necked flask, raise the temperature to 70°C, then add the hydrophobic chain to epichlorohydrin in a molar ratio of 1:1.1 to the flask, install a reflux tube, react for 10 hours, and then remove the solvent by rotary distillation. Intermediate N-14 was obtained as a brown paste.

[0047] (3) Take an appropriate amount of 85% ethanol water 4 solution and put it into a flask, weigh 40 g of guar gum maleate derivative, add it into the flask, stir evenly, and wa...

Embodiment 3

[0049] (1) The preparation method of anionic guar gum is as in Example 1.

[0050] (2) In the three-necked flask, nitrogen gas was passed for 10min; oleic acid and 3-dimethylaminopropylamine were added to the flask according to the molar ratio of 1:1.1; in the flask, 0.5wt% KOH solution was added dropwise, and the temperature was raised to 160 °C, after reacting for 6 hours, unreacted amine and generated water were distilled off under reduced pressure to obtain a tertiary amine product. Add absolute ethanol as solvent to a single-necked flask, raise the temperature to 70°C, then add the hydrophobic chain to epichlorohydrin in a molar ratio of 1:1.1 to the flask, install a reflux tube, react for 10 hours, and then remove the solvent by rotary distillation. Intermediate N-18 was obtained as a brown paste.

[0051] (3) Take an appropriate amount of 85% ethanol aqueous solution and put it into a flask, weigh 40 parts of guar gum maleate, add it into the flask, stir evenly, and wa...

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Abstract

The invention discloses zwitterionic hydrophobic modified guar gum which is characterized in that the structural formula of the zwitterionic hydrophobic modified guar gum is shown in the specification, wherein R1 is a long-chain organicacid, concretely a long-chain saturated acid with a carbon chain of 6-14 or a long-chain unsaturated acid with a carbon chain of 18-22. The invention also disclosesa preparation method of the guar gum. The preparation method comprises the following steps: introducing an anionic monomer into the guar gum to form an anionic guar gum modified product; preparing awater-soluble amphiphilic cationic hydrophobic monomer from hydrophobic long chain, 3-dimethylaminopropylamine and epoxy chloropropane; and introducing the water-soluble amphiphilic cationic hydrophobic monomer into the anionic guar gum modified product to form an amphoteric hydrophobic modified product. The special electrostatic interaction and hydrophobic association of zwitterions are fully utilized to endow the guar gum molecular chain with special dispersity and rheological property, so that the disclosed guar gum has excellent solubility, tackifying property, temperature resistance and salt resistance.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a zwitterionic hydrophobically modified guar gum and a preparation method thereof. Background technique [0002] At present, most oilfields are in the middle and late stages of development, and most of the newly discovered reservoirs are low-permeability and poor in physical properties. Only after the reservoirs are transformed by fracturing and acidification can they reach the value of industrial development. The effect of fracturing largely depends on the performance of fracturing fluid. The fracturing fluid must have sufficient viscosity to ensure that the proppant reaches the predetermined position of the fracture smoothly, and finally achieve a good reservoir stimulation effect. In addition, changes in the salinity and temperature of formations pose a huge challenge to the performance of fracturing fluids. [0003] The viscosity of the guar gum fractu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C09K8/68
CPCC08B37/0096C09K8/68C09K8/90
Inventor 张照阳何启平管彬鲍晋孟照海周瀚陆丽徐婷婷陈晔希蒲祖凤
Owner BC P INC CHINA NAT PETROLEUM CORP
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