Hybrid drill bit and method of drilling

US7845435B2 · kind B2 · utility

Assignee

• Baker Hughes Holdings LLC · US

Inventors

• Anton F. Zahradnik · Saginaw, US
• Rudolf Carl Pessier · Houston, 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 2, 2008
• Grant date: Dec 7, 2010
• Expiry date: Apr 2, 2028

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B10/14
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A hybrid drill bit having both roller cones and fixed blades is disclosed, and a method of drilling. 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- or partially fracture formation in the confined and highly stressed nose and shoulder sections.