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    • 3. 发明公开
    • FIXED CUTTER DRILL BIT HAVING ROLLING CUTTERS
    • 带有滚刀的固定式刀具钻头
    • EP3282084A1
    • 2018-02-14
    • EP16306042.9
    • 2016-08-09
    • VAREL EUROPE (Société par Actions Simplifiée)
    • CUILLIER DE MAINDREVILLE, BrunoDE REYNAL, Michel Jr.GALLEGO, GillesTHER, Olivier
    • E21B10/43
    • E21B10/43
    • A bit for drilling a wellbore includes: a shank (3) having a coupling formed at an upper end thereof; a bit body (2) mounted to a lower end of the shank; a gage section (5) forming an outer portion of the drill bit; and a cutting face (4) forming a lower end of the drill bit. The cutting face (4) includes: a plurality of blades (7p, 7s) protruding from the bit body, each blade extending from a center of the cutting face to the gage section; a plurality of shear cutters (8a, 8b) mounted along each blade; and a plurality of rolling cutters (9). Each rolling cutter includes: a housing (13) mounted to a respective blade; a seat (14) mounted in the housing; and a ball (12) kept between the housing and the seat and having a portion protruding from the housing.
    • 用于钻井眼的钻头包括:具有形成在其上端的联接件的柄(3) 一个安装在柄的下端的钻头体(2) 形成钻头的外部的计量部分(5) 和形成钻头下端的切削面(4)。 切割面(4)包括:从钻头体突出的多个刀片(7p,7s),每个刀片从切割面的中心延伸到计量部分; 沿每个叶片安装的多个剪切机(8a,8b) 和多个滚动切割器(9)。 每个滚轧刀具包括:安装到相应刀片上的壳体(13) 安装在壳体中的座椅(14) 和保持在壳体和座位之间并具有从壳体突出的部分的球(12)。