Malikai Project made a cost-driven decision to adopt the 2-body TLP-DTV configuration to Drill and Complete the Wells offshore. By opting for a Tender Assisted Drilling approach to drill and complete the Well instead of fabricating a permanent rig package, the project could save capital expenditure by building a comparatively smaller TLP. Also cost-driven, for the first time in the industry, the project decided to employ Single-Casing Combo Top-Tensioned Riser (SCTTR) technology as opposed to using the combination of Drilling Risers, and a separate Dual-Casing Production TTR. This is however with a caveat that wear accumulation during drilling needs to be managed and kept to a minimum. Combining the above, the project team needed to manage TLP-DTV marine operations paying attention to station keeping performance required by the SCTTR whilst ensuring the hardware on TLP-DTV (e.g. hawser lines, mooring lines, Personnel Transfer Bridge etc.) is operating safely within their design limits and maximizing the uptime of the offshore activities. To address the specific joint marine operations on TLP and DTV during the Tender Assisted TTR installation, Drilling and Wells Completion phase of the project, an interdisciplinary taskforce comprising the TTR team. Station keeping and Global Performance team, Wells and TLP Operations teams was created for a fully integrated and focused operational procedure. This procedure was aimed atmanaging and assuring TLP-DTV repositioning and station keeping activities which meet the above constraints/objectives, complete with operation decision organization, a clear communication protocol, and comprehensive decision flowcharts to handle all possible scenarios during the operation. An onshore support group located within the well operations team is tasked with monitoring and predicting (based on forecast weather) of the performance of the TLP-TAD system for safe and effective station-keeping performance. The TLP-DTV-TTR operations is built upon the basis that the integrated team is able to plan the TTR installation / Wells construction operations in advance using forecast weather as inputs to continuously simulate numerically TLP-DTV performance - checking against repositioning criteria, as well as the continuous real-time monitoring of TLP-DTV performance against their operating windows using live data obtained from the MIS/MAS system (performed by both the Onshore team and Offshore team). Lastly, to ensure the overall effectiveness and accuracy in executing the operations, the team had created a suite of purpose-designed software to streamline the activities performed by the Onshore and Offshore Team respectively i.e. advanced activity planning via automated continuous forecast simulations of TLP-DTV and TTR performance to indicate operations go/no-go, as well as clear displays of key parameters constantly updated with live realtime data for operations monitoring.
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