近年来使用的喷射式钻头,其喷咀出口处液流的速度可达到120—140米/秒,使钻头在软地层中能钻进11—13小时以上。目前所用的矿物陶瓷和金属压制喷咀的耐磨性虽然基本上也能适应这种工作条件的要求,但是,考虑到今后井底水功率还有可能显著提高,因此对矿物陶瓷和金属压制喷咀的耐磨性,在喷速大为超过上述范围情况下进行了一系列试验研究。 Jet drills used in recent years have flow rates of up to 120-140 m / s at the exit of the nozzle, enabling the drill to drill 11-13 hours in soft formations. Although the wear resistance of mineral ceramics and metal injection nozzles currently used can basically meet the requirements of such working conditions, considering that the power of bottom hole water is likely to increase significantly in the future, the wear resistance of mineral ceramics and metal injection nozzles Tsui wear resistance, the jet speed is greatly exceeded the above circumstances in the case of a series of experimental studies.