Temperature-resistance salt-tolerance macromolecular surfactant for oil field, preparation method and application thereof
A surfactant, temperature-resistant and salt-resistant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of accelerated precipitation formation, poor shear stability, precipitation, etc., to solve the problem of chromatographic separation effect, Overcoming the effect of poor temperature and salt resistance and high surface activity
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Embodiment 1
[0034]In the first step, after fully dissolving 4g of cellulose sodium sulfate with 50ml of twice distilled water, add it into a three-necked flask with a stirrer, a thermometer, and a dropping funnel. 2.4 g (0.03 mol) of sodium hydroxide aqueous solution with a mass concentration of 50% was added dropwise, and stirred at 35° C. for 1.5 hours. 5 g of bromododecane (0.02 mol) was dissolved in 50 ml of N,N-dimethylformamide, and then added dropwise into a three-necked flask, and stirred and reacted at 70° C. for 2 hours. After cooling to room temperature, it was added to 200ml of ethanol for precipitation, filtered and separated to obtain the crude product, and then recrystallized with ethanol, and the purified product was vacuum-dried at 60°C to obtain sulfated cellulose lauryl ether.
[0035] In the second step, add 4 g of sulfated cellulose lauryl ether and 50 ml of distilled water into a three-necked flask equipped with a stirrer, a thermometer, and a nitrogen pipe, feed in ...
Embodiment 2
[0042] In the first step, after fully dissolving 4g of cellulose sodium sulfate with 50ml of twice distilled water, add it into a three-necked flask with a stirrer, a thermometer, and a dropping funnel. 2.4 g (0.03 mol) of sodium hydroxide aqueous solution with a mass concentration of 50% was added dropwise, and stirred at 40° C. for 2 hours. After dissolving 4.7 g of undecane bromide (0.02 mol) in 50 ml of N,N-dimethylformamide, it was added dropwise into a three-necked flask, and stirred and reacted at 70° C. for 3 hours. After cooling to room temperature, it was added to 200ml of ethanol for precipitation, and the crude product was separated by filtration, and then recrystallized with ethanol, and the purified product was vacuum-dried at 60°C to obtain sulfated cellulose undecyl ether.
[0043] In the second step, add 4 g of sulfated cellulose undecyl ether and 50 ml of distilled water into a three-neck flask equipped with a stirrer, a thermometer, and a nitrogen pipe, feed...
Embodiment 3
[0046] In the first step, after fully dissolving 4g of cellulose sodium sulfate with 50ml of twice distilled water, add it into a three-necked flask with a stirrer, a thermometer, and a dropping funnel. 1.6 g (0.02 mol) of sodium hydroxide aqueous solution with a mass concentration of 50% was added dropwise, and stirred at 40° C. for 1.5 hours. After dissolving 4.5 g of bromodecane (0.02 mol) in 50 ml of N,N-dimethylformamide, it was added dropwise into a three-necked flask, and stirred and reacted at 50° C. for 1.5 hours. After cooling to room temperature, it was added to 200ml of ethanol for precipitation, and the crude product was separated by filtration, and then recrystallized with ethanol, and the purified product was vacuum-dried at 60°C to obtain sulfated cellulose decyl ether.
[0047] In the second step, add 4 g of sulfated cellulose decyl ether and 50 ml of distilled water into a three-necked flask equipped with a stirrer, a thermometer, and a nitrogen pipe, feed ni...
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Abstract
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