Downhole drive shaft connection

US7900720B2 · kind B2 · utility

Assignee

• SCHLUMBERGER TECHNOLOGY CORPORATION · US

Inventors

• David R. Hall · Provo, US
• David Lundgreen · Spanish Fork, US
• Paula Turner · Pleasant Grove, US
• Daryl Wise · Provo, US
• Nathan Nelson · Provo, US
• Andrew Pilgrim · Provo, US
• Robert Myler · Marshfield, US

Key dates

• Filing date: Dec 14, 2007
• Grant date: Mar 8, 2011
• Expiry date: Jan 3, 2028

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B10/62
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

In one aspect of the present invention, a section of a drill string has a drill bit with a body intermediate a shank and a working face, the working face having at least one cutting element. A jack element is disposed within the drill bit body and has a distal end substantially protruding from the working face. A drive shaft is in communication with the jack element and a rotary source. The drive shaft has a first portion secured within a bore of a tool string component in the tool string and a second portion secured within a bore of the drill bit. The first and second portions of the drive shaft are connected at a pin and box connection wherein the first and second portions are automatically connected as the tool string component is mechanically coupled to the drill bit.