US Patent 7568535 Methods for recovery and reuse of lost circulation material

Patent 7568535 was granted and assigned to National Oilwell Varco on August, 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

7568535

Date of Patent

August 4, 2009

Patent Application Number

12001490

Date Filed

December 11, 2007

Patent Citations Received

‌

US Patent 12123268 Gas tight shale shaker for enhanced drilling fluid recovery and drilled solids washing

Patent Primary Examiner

‌

Zakiya W Bates

Patent abstract

A system for recovering lost circulation material from spent drilling fluid, the spent drilling fluid containing lost circulation material, drilling fluid, and undesirable solids, the system having alternating separation apparatuses, including sizing apparatus, destiny/shear separation apparatus, and sizing apparatus; and methods for using such a system.

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