SURF recovery using a Subsea Construction Vessel

A Brazilian field operator was looking to deploy a Subsea Construction Vessel they already had on charter for the recovery of flexible flowlines, umbilicals and jumpers across two Campos Basin fields. The installation contractor was tasked with assessing the feasibility of mobilising a decommissioning spread onto the SCV to support recovery operations in water depths of up to 770m - requiring careful evaluation of vessel capability, equipment selection and operational constraints.

MDL conducted a feasibility study to define the optimal back-deck spread for the selected vessel. Data from both fields was analysed to guide equipment selection, with consideration given to local availability and alignment with the campaign schedule. The study evaluated recovery loads, reel capacity and packing requirements before developing multiple deck layout concepts, including detailed assessment of selected configurations with preliminary structural considerations. A recovery methodology was also defined, supported by storyboards and a risk and opportunity assessment to enhance operational safety and efficiency, with particular focus on the application of MDL’s Wheeled Horizontal Lay System (WHLS) to maximise recovery capability.

The study confirmed the feasibility of mobilising a lay spread onto the SCV. It included integration of the WHLS system and provided a clear and practical recovery methodology. The defined approach, supported by preliminary storyboards and engineering assessments, enabled confident planning of the campaign and established a robust and efficient pathway for SURF recovery operations.