空气反循环连续取样钻进,是国外七十年代初推出的一项先进钻探技术,发展到七十年代末,其钻探设备、钻具和钻头均达到比较完善的程度,并在生产中得到推广。对于非固结地层的勘探具有效率高、地层代表性真实、成本低的优点,因而在砂矿勘探中得到广泛的应用。我国目前砂金勘探基本上沿用了班加钻的工艺,设备方面主要是将人力提拉吊锤和回转套管改为机械化 Continuous reverse sampling air drilling is an advanced drilling technology introduced in early 1970s. By the end of 1970s, its drilling equipment, drilling tools and drill bits have reached a relatively perfect level and have been promoted in production . Exploration for unconsolidated formations has the advantages of high efficiency, real formation representation and low cost. Therefore, it has been widely used in the exploration of sand. At present, the exploration of sand in our country basically follows the technique of Banca drilling, and the main equipment in the equipment is the mechanization of lifting the manpower lifting slewing hammer and turning casing