AWR-26 Topside Reuse Project

Abstract

Wellhead Platform AWP-26 was originally developed under PTTEP Arthit Phase 2C, completed installation in 2014 and started a production from 2016 to serve gas plateau and to sustain the Arthit production. Upon depletion of AWP-26 in 2019, PTTEP Arthit Asset realized the opportunity to relocate the AWP-26 to the new prospective location in order to maximize reservoir production. In 2021, the first PTTEP Topside Reuse Project has been put into the offshore execution stage where we proud to present in this paper. The main objective of the project is to convert the originally topside design AWP-26 to suit with new prospective location and renamed to AWR-26. The topside is reused where the subsea structure (so called "jacket") is newly built as to suit with new water depth and soil parameters at the new location. The existing jacket and subsea pipeline were left as is for future decommissioning. While waiting the existing jacket to be decommissioned, tentative in 2026-2031, it is important to install navigation lights system to warn the marine to avoid collision of the remaining jacket structure. The minimal and fit for purposed structure platform is then designed (so called "navigation aid platform") was fabricated and installed onto the existing jacket for safe marine operation. It is not so simple just to relocate and make use of the existing topside to suit with the new prospective location, there were tremendous activities to be considered, starting with engineering design to make the existing topside design to be technically compatible with new process parameters of the new prospective location. Following by the early stage for preparatory works in collaboration within an internal PTTEP parties (Project Construction, Arthit Asset, Arthit Operation & Maintenance and Logistic Team), for the activities including but not limited to; platform plug and abandon, removal of flowlines, preservation of Booster Compressor, collecting the base line inspection data for piping system, platform structural integrity check, etc. In addition, to ascertain the overall weight of topside was within the safe margin and clearly defined the Centre of Gravity (CG) for the topside lifting purpose, all the vessels, tanks, containers, associated piping including the sludge removal were performed.