一、液态二氧化碳洗井洗井工作是水文地质勘探孔与成井工作中很重要的一道工序，井、孔出水量能不能正确地反映地层的含水性与洗井工作有密切关系。过去洗井工作一般采用压风机、拉活塞、钢丝刷、化学等洗井方法，洗井时间长，成本高，效果不佳，得不到真实的地质资料。采用液态二氧化碳洗井，洗井时间短，成本低，效果好，能真实反映地层的含水性，得到准确的地质 First, the liquid CO2 washing well washing work is a very important process in the hydrogeological exploration hole and work well, wells, hole water can not correctly reflect the formation of water and wash well work is closely related. In the past, flushing work generally used pressure blower, pull piston, wire brush, chemical and other well washing methods, washing wells for a long time, high cost, ineffective, can not get the real geological data. The use of liquid carbon dioxide washing wells, washing wells a short time, low cost, good effect, can truly reflect the water content of the formation, accurate geological