Results

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Results

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Once the analysis has been successfully run, you can view various reports and results by clicking on the Results tab of the Analysis component and selecting the relevant buttons. Note that you must first select the stage of interest from the Stage drop-down list in order to view the results appropriate to that particular stage.

PipeLay also generates plots for the various parameters requested on the Summary Postprocessing tab. These plots illustrate the change in a particular parameter from one stage to the next. In this example, the summary postprocessing plots are reproduced in the first five figures below. Structure snapshots for each of the 15 stages are also reproduced in the last figure.

The first figure below shows the maximum bending strain in the pipe section as a function of stage number. For the first ten stages, the bending strain is relatively high. However, once the pullhead reaches the seabed in Stage 11, the strain reduces to almost zero.

The second figure shows the tip separation as a function of stage number. The tip separation remains within the specified range throughout the abandonment process.

The third figure shows layback as a function of stage number. The layback is relatively low over the first five stages, where the winch cable has not fully paid out over the stinger. The layback experiences a sharp increase in the next stage as the Seabed Connection is offset away from the vessel so that the bending strain in the sagbend region is below 0.242 %. As the pullhead reaches the seabed (over Stages 9, 10 and 11), the bending strain in the sagbend region drops below 0.242 %, so no offset is applied to the Seabed Connection and this results in a decrease in layback.

The fourth figure plots the tension at the top of the pipe section as a function of stage number. The tension remains roughly the same over the first four stages, but then drops off as the pipe leaves the vessel deck. Once the entire length of pipe is on the seabed (from Stage 12 onwards), the tension remains relatively constant.

The fifth figure shows the vertical elevation of the pullhead as a function of stage number. The elevation of the pullhead remains constant until the pullhead leaves the vessel deck. The elevation then becomes constant again once the pullhead reaches the seabed.

The last figure presents structure snapshots at the various stages, all superposed onto the same graph. This summarises the overall abandonment scenario at a glance.

Maximum Bending Strain in Pipe Section

Maximum Bending Strain in Pipe Section

Tip Separation

Tip Separation

Layback

Layback

Tension at Top of Pipe

Tension at Top of Pipe

Vertical Elevation of Pullhead

Vertical Elevation of Pullhead

Structure Snapshots

Structure Snapshots

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