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1000mm hard rock HDD hole opener

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1,尺寸size

6- 78

2,切削刀类型 cutter type

81/2寸钻头牙掌,8村滚刀,江汉合金齿81/2 tricone bit cutter , 8 hob cutter ,IADC code 517,537,637, kingdream teeth material steel  YG16

3,连接螺纹

Thread connection

Pin*box (IF,REG , NC,FH )

4,应用Application

非开挖岩石扩孔,如具有高抗压强度的中等地层,如硬页岩,石灰岩,砂岩,白云岩等.Horizontal direction Drilling rock reaming, such as medium strata with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc