Method for withdrawal and insertion of a drill pipe string in a borehole and also a device for use when practicing the method

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United States of America Patent

PATENT NO 8844616
APP PUB NO 20120000671A1
SERIAL NO

13203212

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Importance

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Abstract

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A device for tripping, in which, at a drill-floor opening which is arranged to receive a pipe string, two or more cooperating pipe-handling units are arranged, each, independently of the other(s) or in cooperation with the other(s), being arranged to releasably hold the pipe string fixed and to move the pipe string in its axial direction, and also to move a pipe section in the axial direction of the pipe string and rotate the pipe section around the axis of the pipe string.

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Patent Owner(s)

Patent OwnerAddress
WEST DRILLING PRODUCTS AS4067 STAVANGER

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Grinrød, Mads Stavanger, NO 5 26
Krohn, Helge Sandnes, NO 8 52

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