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    • 3. 发明专利
    • Drilling tool
    • 钻孔工具
    • JP2014177810A
    • 2014-09-25
    • JP2013052244
    • 2013-03-14
    • Mitsubishi Materials Corp三菱マテリアル株式会社
    • NAKAMURA KAZUYOSHIOTA HIROSHI
    • E21B10/18
    • E21B10/602E21B7/20E21B10/18E21B10/43E21B10/56E21B10/64
    • PROBLEM TO BE SOLVED: To allow fluid and drilling waste to be efficiently collected into a discharge ditch, a drilling work to be proceeded with high efficiency and stability, and an influence on a ground around a drilled hole to be restricted.SOLUTION: An inner bit 3 includes a supply hole opening to a tip of the inner bit 3 and discharge grooves 14 formed in an outer peripheral surface of the inner bit 3 and extending in the axial direction. The supply hole includes tip blow holes 15 opening to a front end face of the tip of the inner bit 3 and outer peripheral blow holes 16 opening to the outer peripheral surface of the tip of the inner bit 3. Outer peripheral grooves 19 communicating the outer peripheral blow holes 16 with the discharge grooves 14 are formed in the outer peripheral surface of the inner bit 3, and the outer peripheral grooves 19 are covered by ring bits from the outside in a radial direction and extend gradually toward a base end side in the axial direction while directed around the axis, from the outer peripheral blow holes 16 toward the discharge grooves 14.
    • 要解决的问题:为了使流体和钻井废物有效地收集在排水沟中,钻井工作将以高效率和稳定的方式进行,并且对钻孔周围的地面产生影响将受到限制。解决方案:内部 位3包括通向内钻头3的尖端的通孔和形成在内钻头3的外周表面中并在轴向方向上延伸的排放槽14。 供给孔包括通向内钻头3的前端的前端面的开口孔15和向内钻头3的前端的外周面开口的外周吹出孔16。 在内钻头3的外周面上形成具有排出槽14的周边吹孔16,外周槽19从外侧沿径向被环状钻头覆盖,并在 轴向,从外周吹出孔16向排出槽14排列。