Subsea Production Control System Modelling

Subsea control systems in subsea production system (SPS) play a vital role in the safe and productive operation of any oil or gas field. These systems operate in extreme environments, thus making the installation and commissioning the system risky and costly. For a new developer, a better understanding on how the system works is needed to ensure that the system will meet all design specifications and reduce the risk and costs associated with installation and commissioning. Leading oil and gas companies turned to identify the critical responses and behaviors expected from the designed system through simulation software, where the whole subsea control systems from the Hydraulic Power Unit to the Subsea Control Module can be modeled. In this report, a case study from Cadlao field off the shores of Philippines is used to perform a simulation study on. The field uses a direct hydraulic control system, which from the literature review done, is considered to be the building stone of all other control systems available. The simulation was made by a new simulation tool called Agito ITI SimulationX. The simulation results are then compared with those from the actual field outputs recorded from the Cadlao field. The results of the simulation and the discussion showcases the response of the gate valve actuator and its relation with umbilical hose and Directional Control Valve. Comparison between the experimented results and the simulated results were made to stand upon relativeness of the simulated results.