Wells – Above ground apparatus – With means facilitating connecting or disconnecting...
Reexamination Certificate
2008-07-08
2008-07-08
Chilcot, Jr., Richard E. (Department: 3635)
Wells
Above ground apparatus
With means facilitating connecting or disconnecting...
C166S075140, C175S423000, C188S067000, C081S057180
Reexamination Certificate
active
07395855
ABSTRACT:
Slips (1, 21, 41) for engaging any jointed, coiled or flexible tubular with substantially no scoring, gouging or scraping, such as when supporting a drill string in a borehole or gripping a tubular (2, 22) during the connection or disconnection of a tool joint or pulling a cable or pipeline; additionally, applying a pre-determined minimum gripping force in order to avoid rotary slippage when the weight of the string is insufficient to achieve a conventional slips action; additionally, including a coarse wedge (30, 50) to take up the extra travel of a worn tool joint or a tubular of smaller diameter, with a means to ensure that the coarse wedge acts before the fine wedge (29, 49) does and a means to ensure that the wedging action remains if the actuating force is removed; additionally, including a secondary slips (40) to interfere with the upset on the tool joint to avoid relying on friction to support the string and a means of integrating this with the gripping slips and ensuring that the secondary slips act first; additionally, the application of these attributes ‘upside down’ to achieve the action of snubbing when forcing a tubular into compression instead of tension for any reason.
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Bartlett & Sherer
Brill Gerow D.
Chilcot Jr. Richard E.
Coupler Developments Limited
Sherer Ronald B.
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