Using the HAZOP analysis in the maintenance, modifications and installation of subsea petroleum production systems

The hazard and operability study (HAZOP) is a analysis technique used in the oil and gas industry (O&G) for identifying hazardous operations. Possible conditions outside the normal process are examined in detail and the consequences assessed. The HAZOP analysis help to identify the hazard work conditions by splitting the project into manageable sections, allowing the team to focus on specific goals and parameters. Furthermore, the possible deviations are identified and compared with standard operations and the design characteristics. The purpose of this study is to identify and discuss the common factors studied in the HAZOP analysis in relation to maintenance of subsea petroleum production systems. The paper gives an overview of how the HAZOP analysis is developed before the maintenance interventions start and how the results and corrective actions are managed. It describes how the risk scenarios are visualized by the service providers, suppliers and the O&G operators during the HAZOP meetings. The experience of specialists participating in and analyzing the scenarios is fundamental to completing the interventions successfully. The use of assessment tools in the O&G industry will be maintained and increased over the coming years. Regulating authorities are looking for new mechanisms to assure the safety of petroleum installations. Therefore, the use of HAZOP studies to identify offshore risks may continue to increase in the industry as a response to safety requirements. The efficient coordination of the companies involved in the process and the companies´ commitment to safety practices may reduce risks during interventions. The subsea industry is increasing its work in deep water regions, and the challenges to achieve production in reservoirs located in extreme conditions are also increasing. The assessment tools, such as HAZOP, will contribute to ensuring intervention activities.