Ternary polymer oil-displacing agent, and its preparing method and use
A ternary polymer, oil-displacing agent technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the technology and performance not related to salt resistance and temperature resistance, increase the viscosity of acrylamide polymer solution, It does not involve issues such as maintaining viscosity, and achieves good initiation efficiency, improved temperature and salt resistance, and improved viscosity.
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Embodiment 1
[0043] The preparation of embodiment 1 sodium methacrylate
[0044] Weigh 120g of sodium sulfite, dissolve it in 480ml of deionized water, adjust the pH value to 10.5 with sodium hydroxide or dilute hydrochloric acid after dissolving, filter after standing for 26 hours, add the filtrate to the four-port reaction equipped with agitator, thermometer, and reflux condenser In the bottle, use sodium hydroxide or dilute hydrochloric acid to adjust the pH value to 9.6, weigh 93g of methyl chloride propene into the reaction bottle, heat up to 66.5°C, and react for 3 hours, then concentrate the reaction solution under reduced pressure, and remove the liquid 186ml, carry out hot filtration, remove reaction by-product, after the filtrate is cooled, mix and stir with 600ml saturated solution of sodium methacrylate, then crystallize, filter, dry, obtain sodium methacrylate product.
Embodiment 2
[0046] 71g of acrylamide, 0.71g of sodium methacrylsulfonate obtained in Example 1, and 2.07g of N,N-dimethylacrylamide were dissolved in 143g of deionized water. In the four-neck polymerization bottle of the device.
[0047] Use NaOH or dilute hydrochloric acid to adjust the pH value of the solution to 7-9, then add 0.175g of sodium edetate and stir evenly, adjust the initial temperature to 45°C, blow nitrogen for 30 minutes, add 4% potassium persulfate and 0.6% Sodium sulfite aqueous solution 5g. After 10 minutes, 0.02 g of DMAEMA was added, and the polymerization and hydrolysis reaction was carried out for 4 hours. The material was discharged, cut, vacuum-dried at 50° C. and crushed to obtain a white powdery solid. The degree of hydrolysis of the product is 15%, and the weight content of sulfonic acid groups is 0.85%. A polymer solution with a concentration of 1000ppm was prepared with deionized water, and its Brookfield viscosity at 25°C was measured. The data are listed...
Embodiment 3
[0049] Dissolve 71g of acrylamide, 0.71g of sodium methacrylsulfonate, and 2.07g of N,N-dimethylacrylamide in 143g of deionized water, and add it to a four-neck polymerization system equipped with a thermometer, stirrer, nitrogen conduit and reflux condenser. in the bottle.
[0050] Use NaOH or dilute hydrochloric acid to adjust the pH value of the solution to 6-7, then add 0.175g of sodium edetate and stir evenly, adjust the initial temperature to 35°C, blow nitrogen for 30 minutes, add 4% potassium persulfate and 0.6% Sodium sulfite aqueous solution 5g. After 10 minutes, 0.02 g of DMAEMA was added, and the polymerization and hydrolysis reaction was carried out for 4 hours. The material was discharged, cut, vacuum-dried at 50° C. and crushed to obtain a white powdery solid. The degree of hydrolysis of the product is 5%, and the weight content of sulfonic acid groups is 0.88%. A polymer solution with a concentration of 1000ppm was prepared with deionized water, and its Brook...
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