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近几年来,在硬、脆、碎地层中广泛采用喷射式孔底反循环钻具(以下简称“喷反钻具”)钻进,对提高工程质量、加快勘探速度起了一定作用.但长期以来,在使用中喷反粗径钻具的长度一般被局限在2～3米,因而不适应在完整地层(回次进尺长)钻进,束缚了这种钻具的应用范围.1972年内,我队对湖北地质局的喷反钻具进行了研究改制,分别在硬、脆、碎地层
In recent years, it has been widely used in the hard, brittle and broken stratum that the injection hole bottom reverse circulation drilling (hereinafter referred to as “reverse jet drilling”) drilling has played a certain role in improving the project quality and accelerating the exploration speed. For a long time, however, the length of the drillstring used in the application was generally limited to 2 to 3 meters and was not suitable for drilling in a complete formation (back to footage), limiting the scope of application of such tools. During the year, our team carried out research and restructuring on the spray-and-return drilling tools of Hubei Bureau of Geology, respectively in hard, brittle and crushed formations