US Patent 7637329 Methods and systems for drilling auxiliary holes

Patent 7637329 was granted and assigned to National Oilwell Varco on December, 2009 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

National Oilwell Varco

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

76373290

Patent Inventor Names

Randy Steven Stoik0

Date of Patent

December 29, 2009

Patent Application Number

120093280

Date Filed

January 17, 2008

Patent Primary Examiner

‌

David J. Bagnell

Patent abstract

Systems and methods for drilling auxiliary holes such as conductor holes, ratholes, and mouseholes useful in drilling operations. The systems and methods include the use of a portable drilling apparatus that is selectively mountable on a rig's drill floor and is removable after an auxiliary hole has been drilled. A movable drive unit is pulled down by a cable system forcing the drive unit down and thereby facilitating drilling of the auxiliary hole.

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