Wells – Above ground apparatus
Reexamination Certificate
2007-11-13
2007-11-13
Bagnell, David (Department: 3672)
Wells
Above ground apparatus
C166S085100, C414S540000
Reexamination Certificate
active
11180254
ABSTRACT:
A method and apparatus for positioning and supporting the work platform of a mobile workover rig is disclosed. The work platform of the preferred embodiment of the present invention utilizes a unique support structure and automated positioning system for positioning the work platform at the desired height above the wellhead equipment. The preferred embodiment of the present invention utilizes a specialized automated “pinning” system that secures the work platform at the desired height. Additionally, the present invention utilizes one or more support cylinders to position and support the work platform in the horizontal position over the wellhead equipment. The automated positioning and pinning system of the present invention is a unique system that significantly reduces the time required to position the work platform of a mobile workover rig in the operating position, as well as significantly reduces the risk of injury to rig personnel assisting in the positioning operations.
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Photographs of working platform with mounting shoes in a lifting track mounted on the back of a Pemco Mast, Nub Sullivan, Jun. 2001, 2 pages.
Blankenship Calvin
Cambern Kenneth L.
Cirone James R.
Ferland Joel M.
Furnish Jay D.
Bagnell David
Howrey LLP
National-Oilwell L.P.
Stephenson Daniel P
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