A clean fracturing fluid for automatically breaking gel in reservoirs and its preparation method
A clean fracturing fluid and automatic gel-breaking technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of changing reservoir wettability, reservoir damage, and gel-breaking difficulties, so as to facilitate recovery Displacement, less damage effect
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Embodiment 1
[0018] 1) Butyl methacrylate and dimethylamine aqueous solution in a molar ratio of 1:3 were stirred and reacted at room temperature for 24 hours, and the excess dimethylamine solution was removed by rotary evaporation to obtain the tertiary amine product; 2) 0.5% tertiary amine was passed into CO 2 Until it is clear and transparent, quaternary ammonium salt is obtained as a counter ion salt, and then 2% of sodium oleate thickener, 0.3% of clay stabilizer, and water are added to obtain viscoelastic clean fracturing fluid. The temperature resistance of clean fracturing fluid reaches above 60°C. When continuously feeding CH into the clean fracturing fluid at 60°C 4 Or add a small amount of sodium hydroxide to be CO 2 The protonated tertiary amine is deprotonated, the clean fracturing fluid breaks, and the viscosity drops below 5mPa.s.
Embodiment 2
[0020] 1) Hexyl methacrylate and dimethylamine aqueous solution in a molar ratio of 1:3 were stirred and reacted at room temperature for 24 hours, and the excess dimethylamine solution was removed by rotary evaporation to obtain the tertiary amine product; 2) 0.8% tertiary amine was passed into CO 2 Until it is clear and transparent, quaternary ammonium salt is obtained as a counter ion salt, and then 3% of sodium erucate thickener, 0.5% of clay stabilizer and water are added to obtain viscoelastic clean fracturing fluid. The temperature resistance of the clean fracturing fluid can reach above 90°C. When continuously feeding CH into the clean fracturing fluid at 60°C 4 Or add a small amount of sodium hydroxide to be CO 2 The protonated tertiary amine is deprotonated, the clean fracturing fluid breaks, and the viscosity drops below 5mPa.s.
Embodiment 3
[0022] 1) Octyl methacrylate and dimethylamine aqueous solution in a molar ratio of 1:3 were stirred and reacted at room temperature for 24 hours, and the excess dimethylamine solution was removed by rotary evaporation to obtain the tertiary amine product; 2) 0.8% tertiary amine was passed into CO 2 Until it is clear and transparent, quaternary ammonium salt is obtained as a counter ion salt, and then 4% sodium lauryl sulfate thickener, 0.1% clay stabilizer, and water are added to obtain viscoelastic clean fracturing fluid. The temperature resistance of clean fracturing fluid reaches above 80°C. When continuously feeding CH into the clean fracturing fluid at 60°C 4 Or add a small amount of sodium hydroxide to be CO 2 The protonated tertiary amine is deprotonated, the clean fracturing fluid breaks, and the viscosity drops below 5mPa.s.
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