E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/51.1
E21B 41/04 (2006.01) B25J 11/00 (2006.01) B63C 11/52 (2006.01)
Patent
CA 1279003
ABSTRACT OF THE DISCLOSURE: A method and an apparatus for replacing an insert unit included in an insert valve assembly belonging to a subsea production system for gas and oil. In carrying out the method, a manipulator is brought by means of a sheave, a hoisting cable and guide wires down to a predetermined location on the bottom of the sea. The manipulator comprises a telescopic arm which is then moved towards and fixed by means of a hook and a lug to a valve tree which supports a valve, the insert unit of which is to be unscrewed from the respective valve housing and be replaced. A carriage located in the manipulator and comprising retracting, aligning and fixing devices is brought with the aid of the telescopic arm and a rail, located on the top side of the carriage, towards the valve tree and is fixed to retraction cones mounted on the valve tree. This allows a moment producing tool, mounted in the carriage, to grapple that castellated nut which holds together the insert unit and valve housing of the valve. Thereafter, a releasing moment is applied on the castellated nut, whereby the castellated nut with the insert unit is unscrewed from the valve housing and the valve tree. The carriage with the insert unit is separated from the valve tree and is brought back via the telescopic arm to the manipulator. The insert unit of the valve is replaced by a new insert unit, either by a new insert unit stored in the manipulator and with the aid of gripping arms present in the manipulator, or by raising the manipulator to the surface where replacement can be carried out, whereafter the carriage is again moved towards and fixed to the valve tree. This also allows the moment producing tool to move the new insert unit with its castellated nut towards the valve housing, whereupon a tightening moment can be applied.
549868
Andersson Rolf Jack
Hoglund Kjell
Hoyland Sigbjorn
Husebye Ragnar
Lindland Hans
Ab Asea-Atom
Robic Robic & Associes/associates
Statoil
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