Blowout preventer lift apparatus and method

Details Blowout preventer lift apparatus and method Blowout preventer lift apparatus and method

1998-06-23

2000-04-25

Tsay, Frank S.

Wells

Processes

Placing or shifting well part

166 7751, 254386, E21B 1902, B66F 100

Patent

active

060532556

ABSTRACT:
Apparatus and method for lifting blowout preventers beneath the floor of a drilling rig are provided. More than one cable is used on the drums of winches, allowing the winches to be compact enough for use on a drilling rig floor while avoiding the requirement for larger cable that would be required to achieve the high safety factors needed. The cables or wire ropes on the winches are attached to a member from which a larger diameter, higher strength intermediate cable is also attached. The intermediate cable is then attached to known apparatus such as a cradle for lifting a blowout preventer stack.

REFERENCES:
patent: 4039086 (1977-08-01), Ray
patent: 5467833 (1995-11-01), Crain
patent: 5816565 (1998-10-01), McGuffin

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