1�� College of Geo-Exploration Science and Technology��Jilin University��Changchun 130026��China; 2�� Xinmu Oil Production Plant��of Jilin Oilfield��Songyuan 138000��Jilin��China

permeability��and reservoir pollution is a common phenomenon in this area�� Acidizing deplugging in oil wells has become one of the major measures to improve production efficiency in the field�� A compound deplugging technology in high efficiency low corrosion is developed for this kind of low permeability sandstone reservoir�� On the basis of profoundly understanding of the reservoir's physical properties and sensitivity��along with comprehensive analysis of the cause for jams in oil wells��a series of experiments are carried out in order to investigate the dissolution reaction among samples and deplugging inhibitor��sample dissolving speed��formation fluid compatibility��reduction of secondary pollution��etc�� Considered reservoir condition in nearby wells the optimized compositional deplugging liquid formula is selected for this reservoir�� It is featured by reducing the deplugging reaction speed��extending solution for processing radius��preventing secondary damage in dissolution processing��and removing plug pollution effectively�� To implement this high efficiency low corrosion deplugging measure based on reservoir condition in the borehole and nearby wells��a relatively better result of deplugging and production increasing is achieved��which enriches the measures to increase production in Xinmu oilfield�� and this method can be applied to other similar oilfields for the purpose of maintaining the crude oil production and providing assistant for increasing the production significantly��