Hybrid drill bits

US10072462B2 · kind B2 · utility

Assignee

• Baker Hughes Holdings LLC · US

Inventors

• Anton F. Zahradnik · Saginaw, US
• Rudolf Carl Pessier · Houston, US
• Mitchell A. Rothe · Conroe, US
• Don Q. Nguyen · Houston, US
• Karlos B. Cepeda · Fort Worth, US
• Michael S. Damschen · Houston, US
• Robert J. Buske · Diemelstraße, US
• Johnathan Howard · Diemelstraße, US
• John F. Bradford · Diemelstraße, US
• Gregory Prevost · Spring, US
• Chaitanya K. Vempati · Conroe, US

Key dates

• Filing date: Apr 13, 2016
• Grant date: Sep 11, 2018
• Expiry date: Oct 18, 2036

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B10/55
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

An earth-boring drill bit is described, the bit having a bit body having a central longitudinal axis that defines an axial center of the bit body and configured at its upper extent for connection into a drill string; at least one primary fixed blade extending downwardly from the bit body and inwardly toward, but not proximate to, the central axis of the drill bit; at least one secondary fixed blade extending radially outward from proximate the central axis of the drill bit; a plurality of fixed cutting elements secured to the primary and secondary fixed blades; at least one bit leg secured to the bit body; and a rolling cutter mounted for rotation on the bit leg; wherein the fixed cutting elements on at least one fixed blade extend from a center of the bit outward toward a gage region of the bit but do not include a gage cutting region, and wherein at least one roller cone cutter portion extends from substantially the drill bit's gage region inwardly toward the center of the bit, an apex of the roller cone cutter being proximate to the terminal end of the at least one secondary fixed blade, but does not extend to the center of the bit.