Petroleum Technology Company As

Stâle Pettersen

Erling Kleppa

Trond Kvasnes

A tool for installation of units in connection with oil wells, comprising a housing () with an attachment device () for attachment to a well installation, a telescopic device () for extension of the tool, a torsional force transmission device () for rotation of an internal movable element () of the tool. The internal movable element () comprises a pressure face (), which in an operative condition is exposed to a well pressure and a counter-pressure face (), with a sealing arrangement () between the housing () and the internal movable element () provided between these pressure faces () and devices () which are arranged in such a manner that a pressure can be applied to the counter-pressure face.

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Sandnes, Norway

Stâle Pettersen