1 results about "Vinyl phosphate" patented technology

This invention belongs to the field of oilfield development technology, specifically relating to a cationic clay stabilizer and its preparation method. The clay stabilizer comprises the following components by weight: 10-20 parts of a copolymer of 3-chloro-2-hydroxypropylmethyldiallyl ammonium chloride / dimethyldiallyl ammonium chloride, and 3-10 parts of vinyl phosphate-modified silica. The preparation method is as follows: the copolymer and modified silica are added together to a stirrer, heated to 50-60°C and stirred at 100-300 r / min, then cooled to 40-45°C and stirred again at 300-600 r / min to obtain the clay stabilizer. The clay stabilizer of this invention exhibits excellent comprehensive performance, high anti-swelling rate (greater than 92% even at 150°C, and higher than 93% after three water washes), good salt and acid / alkali resistance, and significantly improves the hydrophobicity of clay surfaces, making it suitable for complex oil reservoir conditions such as high temperature and high salinity.