Selective water plugging method of oil well in oil extraction process

The invention discloses a selective water plugging method of oil well in the oil extraction process. The selective water plugging method comprises the steps that A, first carrier fluid and pretreatment solution are mixed, and pretreatment mixture solution is obtained, the pretreated mixture solution is injected in an oil well; B, second carrier fluid and first water plugging agent are mixed, and first water plugging agent mixture solution is obtained, the first water plugging agent mixture solution is injected in the oil well, the well is closed for 5-8 hours, and 24 hour oil extraction operation is recovered; C, third carrier fluid and second water plugging agent are mixed, and second water plugging agent mixture solution is obtained, the second water plugging agent mixture solution is injected in the oil well, the well is closed for 8-12 hours, the water plugging operation is completed, and oil extraction operation is started normally. The shortcoming of the existing technology is overcome by adopting the s