Pipe gripping ram

a technology of gripping rams and pipes, which is applied in the direction of drilling accessories, fluid removal, borehole/well accessories, etc., can solve the problem of taking several hundred foot-pounds of torque to break the connection between sections of pipes
US20070068669A1Inactive Publication Date: 2007-03-29LESKO GERALD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
LESKO GERALD
Publication Date
2007-03-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

A ram is provided for use in the live and dead heads of an iron roughneck. The ram grips sections of pipe as connections are made or broken between the pipe sections. The ram includes a cylinder block having a bore and a fixed piston centered therein forming an annulus. An annular piston slides in and out of the cylinder block in the annulus. A tong mounted on the end of the end of the annular piston for gripping pipe includes a tong shoe and a tong die within the shoe. The tong die is capable of moving side-to-side within the shoe to self-center itself when gripping pipe. Pressurized gas or hydraulic fluid systems can be used to extend and retract the annular piston within the cylinder block.
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Description

FIELD OF THE INVENTION

[0001] The present invention relates to the field of rams for gripping drilling pipe. More specifically, the present invention relates to pipe gripping rams on automated iron roughnecks used on drilling rigs. BACKGROUND OF THE INVENTION

[0002] Automated iron roughnecks are used on drilling rigs to perform the often dangerous tasks of making and breaking joints between sections of drilling pipe. An iron roughneck usually has two sets of jaws with pipe gripping tongs positioned in a vertical configuration, one on top of the other. The lower set of jaws or “dead head” holds the box end of the section of pipe connected to the drill string. The upper set of jaws or “live head” grasps the pin end of the section of pipe being joined to or removed from the drill string. The dead head tongs hold the drill string steady while the live head tongs turn the pin end of the pipe section clockwise to make a pipe connection or counter-clockwise to break a pipe connection. Depe...

Claims

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