ANALYSIS ON USING FUNCTION DEGRADATION OF PUMPED WELLS IN CHONGQING RED LAYERS AREA

Red layer pumped well in Chongqing is drilled in the red strata area of Penglai Formation to Zhenzhuchong Formation of Jurassic. It solved the difficulties of getting water for the people that lived in Chongqing red layer area. But the new problem of use and maintenance of pumped well is coming out after that. The function of some pumped well is gradually degradation. Through the investigation and analysis of pumped well in Chongqing red layer area, this paper found that after two years of the pumped well built, the function of some pumped wells is going to degrade. Such as with heavy sand and silt at the bottom of well, the water volume decreased, turbid water, the protective pip destroyed, water level falls and the well wall collapse and jam the well, et al. Growth over time, the function of pumped well degrades sharply. Taking effective well washing and maintenance measures can increase the water volume and improve the water quality. It can promote the using function.