The invention relates to a reaming type decompression speed drill, the drill comprises a drill bit body, the bit body from top to bottom is composed of an upper joint, a cutting body and a lower joint, the cutting body is larger than the diameter of the upper joint and the lower joint diameter; in the cutting on the outer peripheral surface along the circumferential direction of a uniform design spiral flutes, spiral blade is formed between the chip groove; in the drill bit body on joint axial center is provided with a main channel, the main channel extends to the cutting body in the lower part of the bottom end of the sprue, a coaxial connected side channel, aperture is less than the sprue runner side and through the next joint; hole in the wall of the main channel respectively to each chip through setting upward inclined hole. The reaming Reaming drill with decompression speed to improve drilling speed, can reduce the damage to the drill bit; can produce a local low pressure vortex at the bottom, reduce cuttings clamping force, the cuttings accelerated swabbing clearance, reduce duplication of cuttings, improve the drilling speed.
【技术实现步骤摘要】
【技术保护点】
一种扩孔式减压提速钻头，其特征在于：该钻头包括钻头本体，该钻头本体从上至下由上接头、切削体和下接头构成，所述切削体的直径大于上接头和下接头的直径；在所述切削体的外周面上沿其周向均匀设有多个螺旋形排屑槽，排屑槽之间形成螺旋形刀翼；在所述钻头本体的上接头轴向中心设有一主流道，该主流道延伸至切削体的下部，主流道底端同轴设有一连通的副流道，所述副流道的孔径小于主流道的孔径并贯通下接头；在所述主流道的孔壁上分别向各排屑槽贯通设置一向上倾斜的水孔。
【技术特征摘要】
【专利技术属性】
技术研发人员：蔚宝华，朱海燕，邓金根，
申请(专利权)人：中国石油大学北京，
类型：发明
国别省市：11
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