Novel acrylamide copolymer oil-displacing agent and synthetic method
An acrylamide copolymer and acrylamide copolymerization technology are applied in the direction of chemical instruments and methods, drilling compositions, etc., which can solve the problems of low chemical stability, poor shear resistance, complicated operation, etc., and achieve broad application prospects, Improved rigidity and simple principle
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Embodiment 1
[0025] Preparation of embodiment one monomer (CTAH)
[0026] Weigh 2 g of chitosan and dissolve in 50 mL of 0.1 mol L -1 In glacial acetic acid, use 0.2 mol·L -1 The sodium hydroxide solution was precipitated, filtered, and the filter cake was washed with deionized water until neutral. The obtained chitosan was dissolved in 150 mL of dimethyl sulfoxide (DMSO), the DMSO solution of maleic anhydride (3.5 g) was slowly dropped into the above solution, and the temperature was raised to 60 o C stirred and reacted for 8 hours, the solution was poured into 500 mL acetone to precipitate, filtered, washed three times with acetone and anhydrous ether, and dried in vacuum to obtain a light yellow fluffy solid.
Embodiment 2
[0027] The preparation of embodiment two monomer (DLMA)
[0028] Measure 4.6 mL of di-n-butylamine into a round-bottomed flask, add 20 mL of dichloromethane into the flask, place the flask in a water bath for ice-bath stirring, slowly add 2.4 mL of methacryloyl chloride dropwise to the In the flask, react naturally for 4 h after the dropwise addition. The solution in the flask was sequentially washed with acid, alkali and saturated brine, and spin-dried under reduced pressure to obtain a light yellow thick liquid.
Embodiment 7
[0029] The preparation of embodiment three tetrapolymers AM / AA / CTAH / DLMA
[0030] Add 0.55 parts of acrylamide (AM), 9 parts of acrylic acid (AA), 0.05 parts of maleic anhydride functionalized chitosan (CTAH), 0.3 parts of N,N-dibutylmethacrylic acid into a 100 mL beaker at room temperature amide (DLMA) and 0.02 parts of emulsifier OP-10 (by mass, the same below), then add 30 parts of deionized water to the beaker, place the beaker on a magnetic stirrer and stir for 30 min to make it fully emulsified, and use NaOH The pH of the solution was adjusted to 8, and nitrogen gas (N 2 ) for 10 min; place the beaker at a temperature of 40 o After stirring at constant temperature in a water bath at C for 20 min, add 0.03 parts of initiator NaHSO to the beaker 3 -(NH 4 ) 2 S 2 o 8 (molar ratio 1:1), making it at 40 o The reaction was stirred at C for 8 h; after the reaction, the polymer was cut into fine particles, washed 3 times with absolute ethanol and pumped with a vacuum pump...
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