A kind of long-acting clay stabilizer for oil well and its preparation and application
A clay stabilizer, oil well technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing the permeability of low permeability oil layers, reducing the relative permeability of hydrocarbons, short validity period, etc., and achieving molecular size Small range distribution, long validity period, small molecular weight effect
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Embodiment 1
[0019] Place a three-necked flask equipped with magnetic stirring and a thermometer on a temperature-controlled electric heating mantle of a magnetic stirrer, and add epichlorohydrin and short-chain multi-charged cationic polyquaternium salt into the three-necked flask at a molar ratio of 2:1, and simultaneously add 10% by weight of ethanol and 2% by weight of sodium sulfite, stirred and heated to 70°C, and continued to stir for 5 hours to obtain a colorless and transparent liquid that is a long-term clay stabilizer for oil wells.
Embodiment 2
[0021] Place a three-necked flask equipped with magnetic stirring and a thermometer on a temperature-controlled electric heating mantle of a magnetic stirrer, and add epichlorohydrin and short-chain multi-charged cationic polyquaternium salts with a molar ratio of 1.8:1 to the three-necked flask, and simultaneously add 10% by weight of methanol and 2% by weight of potassium bisulfite, stirred and heated to 80°C, and continued to stir for 4 hours to obtain a colorless transparent liquid that is a long-acting clay stabilizer for oil wells.
Embodiment 3
[0023] Place a three-necked flask equipped with magnetic stirring and a thermometer on a temperature-controlled electric heating mantle of a magnetic stirrer, and add epichlorohydrin and short-chain multi-charged cationic polyquaternium salts with a molar ratio of 1.0:1 to the three-necked flask, and simultaneously add 10% by weight of isopropanol and 2% by weight of sodium sulfite, stirred and heated to 70°C, and kept stirring for 6 hours to obtain a colorless and transparent liquid that is a long-acting clay stabilizer for oil wells.
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