Abstract: A self-supported riser system (100) for an Anticipated Production System (ASP) Test or a Long Duration Production (LDP) Test in a subsea petroleum production system, utilizing an ANM coupled to a wellhead and Floating Production Unit (FPU) is disclosed. The system includes a wellhead at the seabed, connected to an ANM (20) provided with a preventor (BOP of workover) (30). The preventor (30) is connected to a production riser (50) through a connection tool (40). The riser (50), mounted internally within a buoy assembly (60), is maintained under traction with the aid of a buoy assembly. The upper end of the riser (50) is provided with a Subsea Intervention Terminal (700), the Terminal being interlinked to the FPU by a flexible jumper (90) to carry the oil produced to the FPU. Two methods for installing the self-supported riser system (100) are also disclosed.