Patent · US Active

Drill-string shock absorbers

US7779932B2 · kind B2 · utility

6Cited by

8References

21Claims

0Family size

Assignee

Longyear TM, Inc. · US

Inventors

Markus Hartung · Hünfeld, DE
Stefan Wrede · Kirchhundem, DE
Christof Kruse · Wenden, DE

Key dates

Filing date	Oct 16, 2008
Grant date	Aug 24, 2010
Priority date	—
Expiry date	Apr 14, 2029

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B17/07
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

Implementations of the present invention relate generally to methods, systems, and apparatus for absorbing vibration and shock impulses created during drilling operations. In particular, implementations of the present invention include drill-string shock absorbers adapted to absorb longitudinal forces produced during a drilling operation. For example, drill-string shock absorbers in accordance with at least one implementation of the present invention include a generally cylindrical housing having a first end and a second end coupled together by a radially interlocking joint. Such a configuration can reduce mechanical failure and increase the operating life of the shock absorber by transmitting torsional forces directly between the ends of the housing and reducing stresses from being transferred to fastening means securing the first and second ends of the cylindrical housing together.

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