Lee C. Moore, A Woolslayer Company, Issued US Patent for Dual Offset DerrickTM

TULSA, OK, April 15, 2013 – Lee C. Moore, A Woolslayer Company, announced today the issuance to it by the US Patent Office of a patent which covers a new arrangement for its offshore oil derricks.

The patent is for the Company’s new Dual Offset DerrickTM, a derrick and drill floor arrangement designed specifically for the jackup rig drilling market.

“Our new Dual Offset DerrickTM working-floor design offers a much improved drilling operations visibility for offshore drilling cabins while increasing drill string setback weight distribution,” says Thomas Wingerter, CEO of Lee C. Moore. “The patent offers a much safer view of the rig floor area, which, statistically, is the location of most recordable personal injuries on a drilling rig. The new design also allows for additional extension of a jackup rig cantilevered over well centers.”

The patent covers the arrangement in Lee C. Moore’s offshore derricks where the well center is offset in both x- and y-axes about the centerline of a derrick. The setback area is larger compared to similar designs currently in the market and accommodates drill pipe, drill collars and casing simultaneously.

The unique floor arrangement allows for a more simplified pipe racking operation, improved visibility for the driller, and increased setback capacity. It maximizes load capabilities on cantilever beams and allows for unobtrusive stand-building operation. The offset well center and setback arrangement positions the center of gravity of the derrick for maximum drilling and setback load combinations near the center of a drill floor.

The arrangement provides improved load distribution to cantilever support beams, which maximizes loading capability. Further, stand-building operation is performed in an area clear of the primary racking operation. Working boards and access platform hinge down into position to allow for a manual racking option, saving time in the event of an automatic pipe racking system malfunction.

The Dual Offset DerrickTM offers time and weight savings in the form of optimum center of gravity, which enables an extended reach of cantilever beams over offshore platforms. The arrangement is safety enhanced: a driller has unobstructed visibility which allows for full awareness of all drilling activities in the derrick.

About Lee C. Moore, A Woolslayer Company

Lee C. Moore has been a leading designer and manufacturer of drilling structures since 1907. In 1938, Lee C. Moore revolutionized the petroleum industry when they designed and built the first cantilever mast. To date the company has manufactured over 4,000 cantilever masts and over 600 offshore derricks. Today, Lee C. Moore designs and manufactures masts and derricks for nearly every major drilling company in every drilling condition in both offshore and onshore drilling. They service both their own and other manufacturers’ masts and derricks globally. Lee C. Moore also presents structural training seminars to drilling contractors around the world.

Lee C. Moore designs and manufactures products in accordance with quality requirements

outlined in API Specifications 4F, 8C, and Q1 as well as quality management standards ISO-9001:2008, and TS-29001, adhering to API quality control specifications and following specifications as outlined by AISC, AWS, ANSI, and ASTM.

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