Patent · US Active

Downhole hammer assembly

US8011457B2 · kind B2 · utility

10Cited by

262References

14Claims

0Family size

Assignee

SCHLUMBERGER TECHNOLOGY CORPORATION · US

Inventors

David R. Hall · Provo, US
John Bailey · Orland Park, US
Scott Dahlgren · Alpine, US

Key dates

Filing date	Feb 26, 2008
Grant date	Sep 6, 2011
Priority date	—
Expiry date	Apr 10, 2028

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B21/10
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A drill bit assembly comprises a bit body intermediate a shank and a working face. The shank is adapted for connection to a drill string. The drill string comprising a fluid passage at least partially disposed within the body. A hammer assembly is movably disposed within the fluid passage along it central axis, the hammer assembly comprises a proximal end stabilized by a centralized upper bearing and a distal end stabilized by centralized a lower bearing. The distal end protrudes out of the working face and the hammer assembly comprises a carrier between the upper and lower bearings. Wherein, under normal drilling operations the carrier is adapted to resist a fluid pressure within the fluid passageway such that the fluid pressure will further extend the distal end of the hammer assembly from the working face by pushing on the carrier.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.