Wells – Processes – Assembling well part
Reexamination Certificate
2007-12-18
2007-12-18
Bagnell, Daivd (Department: 3672)
Wells
Processes
Assembling well part
C166S212000, C072S120000
Reexamination Certificate
active
10680724
ABSTRACT:
The present invention generally relates to apparatus and methods for expanding a tubular. In one embodiment, an expander tool includes a body having at least one recess therein. An expansion assembly disposable in the at least one recess includes a piston that outwardly extends from the body in response to a radially outward force. The expansion assembly includes one or more rollers disposed on a shaft such that the rollers rotate at different speeds. In order to improve a rolling ratio, the shaft is arranged on the piston at an outward angle relative to a longitudinal axis of the tool. The expansion assembly is disposed along the tool at a skew to provide tractoring and reduce slippage due to axial movement. A bearing adjacent the roller and rotationally secured to the roller reduces roller heating and wear. In another aspect, methods for expanding a tubular within a wellbore are provided.
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Expandable Slotted Tubes Offer Well Design Benefits, Hart's Petroleum Engineer International, pp. 60-63, Oct. 1996, U.S.A.
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Hillis David
Johnston Gary
Pendleton Gary
Rudd Wayne
Scott Kevin
Bagnell Daivd
Patterson & Sheridan LLP
Stephenson Daniel P
Weatherford / Lamb, Inc.
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