Hybrid drill bit with fixed cutters as the sole cutting elements in the axial center of the drill bit

US7841426B2 · kind B2 · utility

Assignee

• Baker Hughes Holdings LLC · US

Inventors

• Anton F. Zahradnik · Saginaw, US
• Rolf Carl Pessier · Diemelstraße, US
• Don Q. Nguyen · Houston, US
• Michael S. Damschen · Houston, US
• Karlos B. Cepeda · Fort Worth, US
• Tim Marvel · Houston, US
• Matt Meiners · Kuala Lumpur, MY

Key dates

• Filing date: Apr 5, 2007
• Grant date: Nov 30, 2010
• Expiry date: Dec 12, 2027

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B10/16
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A hybrid drill bit having both roller cones and fixed blades is disclosed. The cutting elements on the fixed blades form a continuous cutting profile from the perimeter of the bit body to the axial center. The roller cone cutting elements overlap with the fixed cutting elements in the nose and shoulder sections of the cutting profile between the axial center and the perimeter. The roller cone cutting elements crush and pre-fracture formation in the weak and highly stressed nose and shoulder sections.