Mechanism for connecting and disconnecting tubulars
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United States of America Patent
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-
Nov 24, 1998
Grant Date -
N/A
app pub date -
Mar 5, 1997
filing date -
Jul 31, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A top drive is used to connect successive lengths of casing. The casing is gripped by a mechanism which comprises a support which is attached to the top drive by a drive plate. A circular plate is rotatably mounted in the support and is associated with four jaw assemblies. In use the mechanism is lowered onto a length of casing until the circular plate engages the top of the casing. When the top drive is rotated in one sense the support rotates relative to the circular plate. This causes toothed cylinders to rotate which, in turn, rotates eccentric members which advance the jaws into gripping engagement with the casing. Further rotation of the top drive rotates the casing and screws it into the casing below.
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