Marlim & Voador – XT Life Extension and Reuse

Abstract The Marlim and Voador fields revitalization project aims to extend their production until 2048 through the deployment of two new FPSO units, combining the drilling of new wells with the utilization of aged wells. The project also includes the replacement of existing units, improving field efficiency, and reducing CO2 emissions. This paper describes the methodology used for the XT life extension and reuse in the Marlim and Voador fields. In the producing wells it was only possible to reuse the full clad XT, because the corrosion rates worsen significantly for future conditions, where wells with high CO2 contents will be interconnected to the FPSOs, contaminating the gas-lift of all wells. On the other hand, the XT of the water injector wells could be mostly reused, although the corrosivity of the water injected in the future is potentially more severe, due to the reinjection of produced water. The analysis of technical reports showed that most of the XTs were approved for reuse, with valve integrity being the main reason for rejection. The reuse of XTs significantly contributed to the project’s Net Present Value (NPV) and resulted in the avoidance or postponement of approximately 48 ktons of CO2 emissions.