Wellhead Platform Extension Project - Solution for Additional New Well Slot on an Existing Wellhead Platform

Abstract

Abstract Offshore wellhead platform (OWP) extension is one of Total E&P Indonesie (TEPI) strategic action to slowdown the natural decline of total production by giving possibility to add new well-slot on an existing wellhead platform that its well-slots have been all occupied. Wellhead platform extension project scope is to extend the existing platform structure in order to accommodate additional three or four new well slots. New well slots will be equipped with Conductor Pipe (CP) Guide above and under water, and also CP Protection Frame. Additional Wellhead Control Panel (WHCP), field instruments, F&G system and electric power supply are also constructed for the new wells. Modification of control system is also required in order to integrate new wells input/ output points and Safety Shutdown System (SSS) to the existing Distributed Control System (DCS) for process control. As brown field project, OWP project activities are executed in SIMOPS (Simultaneous Operation) condition with production activities. Field Operation team as a host will ensure the project will be done safely within their operation perimeter and with minimum impact to production continuity especially due to unplanned shutdown. Field Operation also responsible to prepare procedure and line-up the system for tie-in between new and existing facilities (i.e. piping and instrument). Generally there will be requirement for platform shutdown period in order to perform final tie-in, commissioning, and final start-up of new facilities. Offshore wellhead platform extension project include several high risk activities such as: saturation diving, heavy lifting and naked flame jobs within existing live facilities, which become project major challenges and require detailed job risk assessment and good preparation from both Project and Field Operation team. Currently, offshore wellhead platform extension has been successfully implemented on seven TEPI's platforms within three years and with minimum impact to production continuation.