Fluid loss reducer for drilling fluid and its preparation method and application
A technology of fluid loss reducer and drilling fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of increased drilling fluid viscosity, excessive dosage, and poor fluidity of drilling fluid, etc. Strong filtration capacity, simple synthesis method, and low apparent viscosity
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Embodiment 1
[0023] Get 35 parts by weight of edible first-grade white dextrin, 40 parts of industrial superior grade yellow dextrin, 10 parts of 99% caustic soda, 15 parts of 95% ethanol, 8 parts of water and 15 parts of 97% epichlorohydrin under stirring Add them to the kneader respectively, and feed steam into the jacket of the kneader to keep the temperature at 80° C. for 3 hours. After the reaction was completed, cold water was poured into the jacket, cooled to below 50°C, discharged, dried at 110°C for 4 hours, and then pulverized to obtain the fluid loss reducer for drilling fluid of this embodiment.
Embodiment 2
[0025] Get 45 parts by weight of edible first-grade white dextrin, 35 parts of industrial superior grade yellow dextrin, 12 parts of 99% caustic soda, 18 parts of 95% ethanol, 9 parts of water and 12 parts of 97% epichlorohydrin under stirring Add them to the kneader respectively, and feed steam into the jacket of the kneader to keep the temperature at 90° C. for 3 hours. After the reaction was completed, cold water was poured into the jacket, cooled to below 50°C, discharged, dried at 115°C for 4.5 hours, and then pulverized to obtain the fluid loss reducer for drilling fluid of this embodiment.
Embodiment 3
[0027] Get 40 parts by weight of edible first-grade white dextrin, 30 parts of industrial superior grade yellow dextrin, 8 parts of 99% caustic soda, 12 parts of 95% ethanol, 7 parts of water and 10 parts of 97% epichlorohydrin under stirring Add them to the kneader respectively, and feed steam into the jacket of the kneader to keep the temperature at 75° C. for 3 hours. After the reaction was completed, cold water was poured into the jacket, cooled to below 50°C, discharged, dried at 105°C for 5 hours, and then pulverized to obtain the fluid loss reducer for drilling fluid of this embodiment.
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Abstract
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