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冲击钻井
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[[Image:drilling icon.png|right|80px]]
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Percussion drilling is a manual drilling technique in which a heavy cutting or hammering bit attached to a rope or cable is lowered in the open hole or inside a temporary casing. The technique is often also referred to as 'Cable tool'. Usually a tripod is used to support the tools. By moving the rope or cable up and down, the cutting or hammering bit loosens the soil or consolidated rock in the borehole, which is then extracted later by using a bailer. Just as with [[hand auger - general|hand augering]], a temporary casing of steel or plastic may be used to prevent the hole from collapsing. When the permanent well screen and casing are installed, this temporary casing has to be removed.冲击钻井是一种人工钻井技术，需将较重的开凿钻头或锤击钻头连接在绳子或缆绳上，降到洞中或临时的套管里。这一技术通常也指“绳索钻具”。一般会运用三脚架支撑工具。通过上下拉动绳索，钻头将探孔内的土壤或固结岩击松，随后用泥浆泵将其抽出。就像使用手钻（[[hand auger - general|hand augering]]）时那样，冲击钻井时可能会使用钢制或塑料的临时套管防止凿洞塌陷。永久的井管滤网和套管安装完成后，临时套管必须移除。
===Suitable conditions===