Combined grip control of elevator and spider slips

Details Combined grip control of elevator and spider slips Combined grip control of elevator and spider slips

2006-08-08

2006-08-08

Bagnell, David (Department: 3672)

Wells

Above ground apparatus

With means facilitating connecting or disconnecting...

Reexamination Certificate

active

07086461

ABSTRACT:
Apparatus for gripping and releasing a tubular and comprising an elevator (13) having slips (15) for gripping and releasing a tubular (39,40). A spider (12) has slips (14) for gripping and releasing the tubular (33). A mechanically operated valve (18) is provided for controlling the supply of pressurised fluid to move the spider slips (14) between a gripping position and a release position, with sensor means (28) detecting when the elevator slips (15) are in the gripping position. Means (31) mechanically inhibits movement of the valve (18) to a position in which the spider slips (14) release the tubular (40) when said sensor means (28) detects that the elevator slips (15) are not in a correctly gripping position. A second valve (20) controls movement of the elevator slips (15) and a guide plate (24) links control of both valves (18, 20).

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