Subsea 7 Limited

H. Butting Gmbh & Co. Kg

Friedrich Henneicke

Thomas Schüller

John Arthur Mair

Joachim Banse

Gernold Holler

A method is disclosed for reeling or unreeling a pipeline having an inner corrosion-resistant metallic liner that is tightly fitted within the pipeline. To minimize or avoid wrinkling of the liner during the reeling or unreeling, a length of the pipeline is internally pressurized in a two-stage pressurizing process, and then the length of pipeline is reeled or unreeled, as the case may be. In the first stage of the pressurizing process, the length of the pipeline is filled with fluid at an elevated pressure, and in the second stage the fluid pressure is raised to a higher pressure, which may be 25 bars or more, absolute.

Method of reeling and unreeling an internally clad metal pipeline

A method is disclosed for reeling a pipeline having an inner corrosion-resistant metallic liner that is tightly fitted within the pipeline. To minimize or avoid wrinkling of the liner during the reeling or unreeling, a length of the pipeline is internally pressurized by deploying a single sealing pig within the pipeline near to the trailing end of the pipeline and applying pressurized fluid within the pipeline, and then the length of pipeline is reeled onto a storage reel. In the pressurizing process, the length of the pipeline is filled with fluid at an elevated pressure within a range defined by a lower limit of 5 bar.

A sealing system for the interspace in the transition region between two well pipes of different diameters, and a mounting tool for producing the sealing connection. The mounting tool is lowered via a drilling string through a larger diameter pipe and, with a sealing system, is placed on a holding docket on the upper end of a lower, smaller diameter, pipe. A rotation exerted on the mounting tool via the drilling string; causes the sealing system to be fixed to the lower pipe. Via the drilling string, the mounting tool is pressed vertically downwards against a sealing ring of the sealing system which, as a result, bears in a sealing manner against the inner wall of the upper pipe of larger diameter. This sealing position is fixed by rotating the mounting tool in one direction and by rotating the mounting tool in the other direction.

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Wittingen, Germany

Friedrich Henneicke