Radially moving slips

Wells – Above ground apparatus – With means facilitating connecting or disconnecting...

Reexamination Certificate

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Details

C166S075140, C175S423000, C188S067000, C081S057180

Reexamination Certificate

active

10510316

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.

REFERENCES:
patent: 935764 (1909-10-01), Martin
patent: 1971473 (1934-08-01), Zerbe et al.
patent: 3760469 (1973-09-01), Brown
patent: 4576254 (1986-03-01), Cox
patent: 4715456 (1987-12-01), Poe et al.
patent: 5027926 (1991-07-01), Cox
patent: 6089338 (2000-07-01), Bouligny
patent: 6644413 (2003-11-01), Adams et al.
patent: 6688394 (2004-02-01), Ayling

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