Study on Technology of Breaking Water Block in Later Stage of Gas Reservoirs Production in West Sichuan

With the decreases of the formation pressure and the production, water block damage appears gradually andbecomes the main damage of tight gas reservoirs in west Sichuan.In this paper, based on the research of influencing factors,the performances of treating agent to reduce the water lock damage are low surface tension, effective wettability control andchemical scale removal.A kind of new treating agent is developed in laboratory, and the experimental results show that thisnew agent can effectively promote the water and gas production, which provides new method for the development of old gaswells in later production stage.