在水文地质钻孔施工中，经常要向孔内下入大量套管作为临时性观测管或抽水管。过去经常因为缩径或泥浆沉淀造成起拔套管困难。现试用了套管外涂黄油缠塑料布的方法，基本解决了起拔套管的问题。具体作法见下图。 In hydrogeological drilling construction, often to the hole into a large number of casing as a temporary observation tube or suction pipe. In the past, it was often difficult to lift the casing due to diameter reduction or mud settling. Is now trying out the casing coated with butter plastic wrap method, the basic solution to the problem of pulling the casing. The specific approach shown below.