Preparation method of partially hydrolyzed polyacrylamide gel blocking agent
A polyacrylamide gel sealing and blocking agent technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as a large amount of water, high pumping pressure, and inability to construct due to pumping pressure.
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Embodiment 1
[0021] In a four-necked 500ml flask with a reflux condenser, a thermometer, and a dropping funnel, add 80g of propionic acid and 20.5g of sodium dichromate, put in a stirring magnet, put the flask into a magnetic stirrer with an electric heating jacket, and turn it on Magnetic stirrer, open the cooling water valve of the reflux condenser, dissolve 29.5g of sodium bisulfite aqueous solution with 100g of distilled water, add dropwise in 2 to 3 hours, then heat up to 100 to 110°C, reflux for 4 to 5 hours, and cool to At room temperature, a dark green viscous chromium propionate crosslinking agent was obtained.
[0022] In a four-neck 500ml flask with a reflux condenser, a thermometer, a dropping funnel and a stirrer, add 200g of distilled water, turn on the stirrer, slowly add 136g of sodium hydroxide, and control the temperature at 60-70°C to completely dissolve the sodium hydroxide After adding 28g of polymaleic acid dropwise, add 22g of ethylene glycol and 4g of sodium sulfide...
Embodiment 2
[0024] In a four-necked 500ml flask with a reflux condenser, a thermometer, and a dropping funnel, add 91g of propionic acid and 34g of potassium dichromate, put in a stirring magnet, put the flask into a magnetic stirrer with an electric heating jacket, and turn on the magnetic force Mixer, open the cooling water valve of the reflux condenser, dissolve 37.5g of sodium sulfite aqueous solution with 100g of distilled water, drop it in 2 to 3 hours, then heat up to 100 to 110°C, reflux for 4 to 5 hours, and cool to room temperature to obtain ink Green viscous chromium propionate crosslinker.
[0025] In a four-neck 500ml flask with a reflux condenser, a thermometer, a dropping funnel and a stirrer, add 200g of distilled water, turn on the stirrer, slowly add 145g of sodium hydroxide, and control the temperature at 60-70°C to completely dissolve the sodium hydroxide , After adding 26g of polyacrylic acid dropwise, add 22g of ethylene glycol and 5.5g of thiourea, and react at 80-9...
Embodiment 3
[0027] In a four-necked 500ml flask with a reflux condenser, a thermometer, and a dropping funnel, add 105g of propionic acid and 27.5g of sodium dichromate, put in a stirring magnet, put the flask into a magnetic stirrer with an electric heating jacket, and turn it on With a magnetic stirrer, open the cooling water valve of the reflux condenser, dissolve 31g of hydrazine hydrochloride aqueous solution with 100g of distilled water, and complete the dropwise addition in 2 to 3 hours, then heat up to 100 to 110°C, reflux for 4 to 5 hours, and cool to room temperature to obtain Dark green viscous chromium propionate crosslinker.
[0028] In a four-necked 500ml flask with a reflux condenser, a thermometer, a dropping funnel and a stirrer, add 200g of distilled water, turn on the stirrer, slowly add 140g of sodium hydroxide, and control the temperature at 60-70°C to completely dissolve the sodium hydroxide , after adding 25g of acrylic acid and maleic acid copolymerized acid dropwi...
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