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我队一分队和“三八”分队对无锡钻探工具厂研制的φ56毫米天然金刚石孕镶钻头，进行了生产性试验，共试验了14个，共进尺805.67米。平均钻头进尺58.26米（个别钻头仍在继续使用），平均时效1.54米/小时，其中69—9号钻头进尺达到149.64米。试验情况表明，无锡厂试制的钻头，无论其胎体包镶强度、粉末金属料的配比、钻头几何形状、水口
A unit of our team and “38” units carried out productive tests on the φ56 mm natural diamond impregnated drill bit developed by Wuxi Drilling Tools Factory. A total of 14 tests were conducted with a total footage of 805.67 meters. The average drill bit footage of 58.26 meters (individual bits are still continuing to use), the average age of 1.54 m / h, of which 69-9 drill footage reached 149.64 meters. Test conditions show that trial production of Wuxi factory drill, regardless of their carcass package strength, the ratio of powder metal materials, bit geometry, the nozzle