专利检索 ap:("CNPC USA CORPORATION" OR "BEIJING HUAMEI, INC." OR "CHINA NATIONAL PETROLEUM CORPORATION") AND inv:"Shijun Qiao" 第 1 页

1.

发明授权
Cutting elements with increased curvature cutting edges 有权

公开(公告)号：US11591858B2

公开(公告)日：2023-02-28

申请号：US17247478

申请日：2020-12-11

申请人： CNPC USA CORPORATION , BEIJING HUAMEI, INC. , CHINA NATIONAL PETROLEUM CORPORATION

发明人： Jiaqing Yu , Chris X. Cheng , Jianhua Guo , Bo Zhou , Shijun Qiao , Chuang Zhang , Xu Wang , Chi Ma , Xiongwen Yang

IPC分类号： E21B10/43 , E21B10/567 , E21B10/54 , E21B10/58

摘要： A drill bit for cutting formation comprises a bit body, a plurality of cutters, a plurality of blades with pockets to accommodate the cutters respectively. Each of the plurality of cutters has an ultra-hard layer, two side facets extending obliquely inward from the substrate to a top surface of the ultra-hard layer, a convex portion between the two side facets. The convex portion comprises a transition surface and the transitional surface is convex as it extends between adjacent the two side facets. The curvature of the transitional surface varies along the cutter axis with the curvature at the cutting edge larger than the curvature of the cutter circumferential surface.