SALT PLUG REMOVAL TECHNIQUE NEAR WELLBORE AREA IN WENDONG OILFIELD

Salt plugging position makes a slow descent until tunnel or fracture of formation with the decline of formation pressure,and then causes cricital plugging.This paper introduces the research and application achievements in Wendong Oilfield in recent years,which include screening and evaluation of chemical plug removal agent,chemical plugging technique,micropermeation desalination plug removal technique by continuous water feeding,gap bridge pump and chemical reagent flushing plug removal technique.