Abstract: Most reservoirs in Bohai Bay oil field ARE sandstones reservoir,being loosely cemented.During underbalanced perforation in well completion,sand flowing is serious from the formation,increasing the stuck risk of perforation guns.The conventional perforation fluid can not meet the requirements for the operation,especially in highly deviated well perforation.By using PRD perforation fluid,thin mud cake can be developed in the perforated interval,reducing sand production,fluid loss into formation,and protecting the reservoirs.The mud cake can be removed by gel breaking to prevent blocking the oil flow passage.PRD perforation fluid has increased highly the safety of perforation,reduced accident rates,and improved the well completion completeness,which is worth promoting widely.