Fusozyme Injection Well Enzyme-based Deplugging Agent is the world first biological enzyme technology product designed for efficient degradation of slickwater and polyacrylamide (PAM) residual polymers in oilfield polymer injection wells. The product is produced based on the Pichia pastoris expression system and provided in the form of a high-activity, high-stability solid enzyme preparation. It has excellent temperature and salt resistance as well as convenience for long-term storage and transportation, providing a green, efficient and sustainable industry-breakthrough solution for oilfield post-fracturing deplugging and enhanced oil recovery.