Application of multi-effect compound acid plugging removal technology in water injection wells of Bohai oilfield

Reservoir blockage is common in the process of water injection in Bohai oilfield, which leads to high injection pressure and insufficient water injection requirements. Aiming at the problems existing in the injection wells of Bohai oilfield, a new BDF-01 multi-effect compound acid system was developed through laboratory experiments. The system was applied on the site of 3 injection wells in Bohai oilfield. After acidification, the apparent water absorption index was 1.9～3.8 times higher than that before acidification, and a good plugging effect was obtained.