Cutting elements with increased curvature cutting edges

US11591858B2 · kind B2 · utility

Assignees

• CNPC USA Corporation · US
• Beijing Huamei, Inc. · CN
• China National Petroleum Corporation · CN

Inventors

• Jiaqing Yu · Houston, US
• Chris Cheng · Houston, US
• Jianhua Guo · Bothell, US
• Bo Zhou · Chengdu, CN
• Shijun Qiao · Beijing, CN
• Chuang Zhang · Fort Collins, US
• Xu Wang · Beijing, CN
• Chi Ma · Beijing, CN
• Xiongwen Yang · Beijing, CN

Key dates

• Filing date: Dec 11, 2020
• Grant date: Feb 28, 2023
• Expiry date: Dec 11, 2040

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B10/58
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

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.