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Kasper Koch

Thomas Walburgis Bakker

Jacob Van Oord

An apparatus for making up and breaking out of a tubing string in a well includes a connector ( ) for connection to a tubular ( ) and a main high pressure conduit ( ) communicating with the connector ( ) for allowing circulation through a tubular ( ) connected thereto. Below that unit a connecting shell ( ) bounding a connecting chamber ( ) has an upper passage ( ) and a lower passage ( ), a preventer ( ) for separating an upper portion ( ) of the connecting chamber ( ) from a lower portion ( ) thereof, and a back-up high pressure conduit ( ) communicating with the connecting chamber ( ). A pressure corresponding to the pressure in the upper portion ( ) of the connecting chamber ( ) is provided in at least one pressure chamber ( ) and exerts a force pressing a tubular ( ) or the connector ( ) into the connecting chamber ( ) against forces exerted by pressure in the connecting chamber ( ).

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Delft, Netherlands

Kasper Koch