A kind of preparation method of amphiphilic starch fluid loss reducer for water-based drilling fluid
A technology of water-based drilling fluid and fluid loss control agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of no amphiphilic starch, etc., and achieve the effect of good compatibility and high temperature resistance
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example 1
[0030] Weigh 1000 parts of starch, add it to a three-necked flask, then add 100 parts of methanol, place the three-necked flask in a water bath with a temperature of 35°C, and stir at a speed of 300 rpm for 30 minutes; add 100 parts of sodium hydroxide and 2000 parts of water, continue to stir for 30 minutes; sequentially add 100 parts of sodium hydroxide, 300 parts of chloroacetic acid, 200 parts of methanol, heat up to 60 ° C, and react for 60 minutes; cool to room temperature (10 ° C), add 100 parts of sodium carbonate and 0.5 parts of Chloroform, continue to stir for 10 minutes; add 100 parts of sodium carbonate and 800 parts of acrylic acid in sequence, raise the temperature to 40°C, and stir at a speed of 500 rpm for 30 minutes, during which nitrogen gas is introduced; add 10 parts of ammonium persulfate, heat up to 70°C, Continue to react for 120 minutes; stop stirring, lower the temperature to room temperature (10°C), and continue to stand for 120 minutes, then discharg...
example 2
[0032] Weigh 1000 parts of starch, add it into a three-necked flask, then add 200 parts of methanol, place the three-necked flask in a water bath with a temperature of 35°C, and stir at a speed of 300 rpm for 30 minutes; add 150 parts of sodium hydroxide and 2500 parts of water, continue to stir for 30 minutes; sequentially add 100 parts of sodium hydroxide, 400 parts of chloroacetic acid, 200 parts of methanol, heat up to 60 ° C, and react for 70 minutes; cool to room temperature (15 ° C), add 150 parts of sodium carbonate and 1.0 parts of Chloroform, continue to stir for 10 minutes; add 200 parts of sodium carbonate and 1500 parts of 3-phenyl-2-acrylic acid in sequence, heat up to 50 ° C, stir at 500 rpm for 35 minutes, and feed nitrogen during the period; add 15 parts of persulfuric acid Potassium, heat up to 75°C, continue to react for 160 minutes; stop stirring, lower the temperature to room temperature (15°C), and continue to stand for 150 minutes, then discharge; centrif...
example 3
[0034] Weigh 1000 parts of starch, add it into a three-necked flask, then add 300 parts of methanol, place the three-necked flask in a water bath with a temperature of 35°C, and stir at a speed of 300 rpm for 30 minutes; add 200 parts of sodium hydroxide and 3000 parts of water, continue to stir for 30 minutes; sequentially add 200 parts of sodium hydroxide, 500 parts of chloroacetic acid, 300 parts of methanol, heat up to 60 ° C, and react for 80 minutes; cool to room temperature (25 ° C), add 200 parts of sodium carbonate and 0.8 parts of Chloroform, continue to stir for 10 minutes; add 150 parts of sodium carbonate and 1800 parts of acrylonitrile successively, heat up to 40 ° C, stir at 500 rpm for 40 minutes, and feed nitrogen at the same time; add 20 parts of cyclohexanone peroxide, and heat up to 80°C, continue to react for 180 minutes; stop stirring, lower the temperature to room temperature (25°C), and continue to stand for 180 minutes, then discharge; centrifuge, wash ...
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