Temperature-resistant and salt-resistant viscoelastic granular oil displacement agent and its preparation method and application
A temperature-resistant and salt-resistant, viscoelastic technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problem of insufficiency, temperature and salt resistance, poor gel strength and viscosity enhancement, and short expansion time. And other issues
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Embodiment 1
[0068] Add 100Kg of deionized water into the reaction kettle, then add 10Kg of acrylic acid (AA), and then add 1Kg of AMPS to the reaction system after it is completely dissolved, while keeping the temperature of the reaction system at 10°C, stir for 1 hour, and finally stir and mix well. Add 1.26Kg N,N-dimethylacrylamide (DMAM) to the above reaction system, after it is fully dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the DMAM in the reaction system. oxygen. Adjust the pH in the reaction kettle, and slowly add 0.006Kg [Bmim] to the reaction system under the protection of nitrogen 4 [SiMo 12 o 40 ] and 0.12Kg ethylene glycol initiated system aqueous solution prepolymerization. The reaction kettle was sealed, and the reaction time was 3h.
[0069] After the pre-polymerization reaction was completed, the pre-polymerization product was added into 1...
Embodiment 2
[0071] Add 100Kg of deionized water into the reaction kettle, then add 10Kg of acrylic acid (AA), and then add 5Kg of AMPS to the reaction system after it is completely dissolved, while keeping the temperature of the reaction system at 15°C, stir for 1 hour, and finally stir and mix well. Add 4.95Kg N,N-dimethylacrylamide (DMAM) to the above reaction system, after it is fully dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the DMAM in the reaction system. oxygen. Adjust the pH in the reaction kettle, and slowly add 0.045Kg [Hmim] to the reaction system under the protection of nitrogen 4 [SiMo 12 o 40 ] and 0.45Kg pentaerythritol initiated system aqueous solution prepolymerization. The reaction kettle was sealed, and the reaction time was 4h.
[0072] After the pre-polymerization reaction was completed, the pre-polymerization product was added to 50K...
Embodiment 3
[0074] Add 100Kg of deionized water into the reaction kettle, then add 20Kg of acrylic acid (AA), and then add 3Kg of AMPS to the reaction system after it is completely dissolved, while keeping the temperature of the reaction system at 12°C, stir for 1 hour, and finally stir and mix well. Add 3.11Kg of N,N-dimethylacrylamide (DMAM) to the above reaction system, after being dissolved and mixed well, inject nitrogen gas into the reaction solution for 30 minutes through the nitrogen port at the bottom of the reaction kettle, so as to fully remove the DMAM in the reaction system. oxygen. Adjust the pH in the reaction kettle, and slowly add 0.0217Kg [Hpy] to the reaction system under the protection of nitrogen 4 [GeMo 12 o 40 ] and 0.2893Kg glycerol initiation system aqueous solution prepolymerization. The reaction kettle was sealed, and the reaction time was 3.5h.
[0075] After the pre-polymerization reaction was completed, the pre-polymerization product was added to 32.5Kg A...
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