Abstract
The installation phase is a critical stage in a field development involving offshore platform and poses different challenges unique to each project. Among the challenges are performing the execution at a restricted workspace location in brownfield area with the tight installation tolerance, live wellhead, and weather limitation.
Due to limited installation tolerance, innovation to the platform design had been made to allow Main Support Frame (MSF) counter rotation to cater the out of tolerance risk on positioning and orientation. Additional survey equipment deployed has increased the efficiency and accuracy prior setting down the jacket at the intended position.
Existing WHSS which was held by jack up rig and its hanging condition with pre-installed conductors all the way from the WHSS to the seafloor has caused vibration to the WHSS made it difficult to secure the exact coordinate of WHSS prior jacket installation. A good weather window is essential to reduce WHSS movement due to vibration introduced by the hanging conductors. Strong underwater current of more than 1 knot has worsened the situation, adding more variables into the equation in restraining WHSS movement before any welding connecting the jacket and WHSS can be performed.
All the above challenges were successfully mitigated via the identified measures and the platform was successfully installed allowing the secured WHSS to be released from the jack up rig. Innovation to the platform design and installation methodology are essential in ensuring its completion in such environment and constraints.
