Method of staged refracturing for fractured well

Abstract

This application belongs to the technical field of oil and gas exploitation and provides a method of staged refracturing for a fractured well. The method includes re-perforating a target wellbore to form a new perforation where a position of the new perforation is different from a position of an old perforation of the wellbore. A fracturing fluid is injected into a first fracturing stage of the target wellbore to stimulate new and old fractures. A fluid containing a plugging agent is injected into the wellbore for plugging the perforations in the target wellbore, with a portion of the plugging agent entering the perforations. A perforation plugging effect is checked with fracturing monitoring data, and the refracturing of the current stage is completed. A packer is slid into place using tubing to a second fracturing stage, and repeating the above steps until the refracturing of the whole wellbore section is completed.