Hybrid drill bits having increased drilling efficiency

US10190366B2 · kind B2 · utility

Assignee

• Baker Hughes Holdings LLC · US

Inventors

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

Key dates

• Filing date: Apr 25, 2016
• Grant date: Jan 29, 2019
• Expiry date: Aug 2, 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.