MODULAR APPARATUS FOR ASSEMBLING TUBULAR GOODS

摘要

A modular pipe gripping assembly has a universal actuator assembly having a control fluid swivel. An external pipe gripping assembly can be attached to the actuator assembly for gripping the external surface of a section of pipe. Alternatively, the external pipe gripping assembly can be quickly and easily removed and replaced with an internal pipe gripping assembly for gripping the internal surface of a section of pipe. Control fluid pressure is trapped within the actuator assembly, but relieved from a fluid swivel, permitting high speed rotation of the modular pipe gripping assembly and preserving swivel seal life.

主权项

1. A method of gripping pipe comprising:
a) connecting a modular pipe running assembly to a top drive assembly, said modular pipe running assembly comprising:
i) an actuator assembly comprising:
aa) a control fluid swivel assembly having at least one fluid sealing element;bb) a control manifold detachably connected to said swivel assembly for supplying control fluid to said swivel assembly;cc) at least one fluid actuated piston;dd) a check valve disposed between said swivel assembly and said at least one fluid actuated piston;ii) an interchangeable pipe gripping assembly connected to said actuator assembly, wherein said interchangeable pipe gripping assembly is actuated by said actuator assembly; and b) gripping pipe with said pipe gripping assembly.