Importance

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Abstract

A device serves to interconnect pipes (3) to form a casing (1). A new pipe (3) to be added to the top of the casing (1), is suspended from an elevator (4) assigned to a drawworks, the latter being assigned a top drive (7) above the elevator (4). The device comprises a tubular hydraulic telescopic (device (9, 10), one end thereof being connected to the output shaft (8) of the top drive (7), the other end thereof being provided with a catcher (11) adapted to catch, raise and rotate the pipe (3). The catcher (11) is adapted to be guided into the pipe (3) and to be expanded to rest against the pipe and, thus, to establish an internal friction connection.

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First Claim