Subsea Tree System
As part of the creation of domestic equipment for the system of underwater hydrocarbon production, AO Engineering Center of Shipbuilding developed a subsea tree system, and a pilot model is currently being manufactured.
The delivery set of the complex “Subsea Tree System” includes:
• Subsea tree system valve block with shut-off valves and hydraulic drives of shut-off valves;
• Subsea tree system protective frame;
• Piping manifold of the control system of shut-off valves of subsea tree systems, couplings and downhole equipment;
• Subsea tree system flow line with a coupling sleeve for the coupling of the choke module and the infield pipeline;
• Equipment that provides interfacing with measuring equipment for subsea tree system;
• Connecting elements for underwater control module;
• Protective frame of the choke module;
• Vent line section of the choke module;
• Piping of the control system of shut-off and control valves and the coupling of the choke module;
• Equipment that provides interfacing with measuring equipment for the choke module;
• Technological and test equipment for subsea tree system and choke module;
• Corrosion protection system.
Main characteristics
| Equipment positioning | underwater |
| Estimated installation depth, m | 500 |
| Estimated pressure of the production line of subsea tree system, MPa | 69 |
| Estimated pressure of the production line of the choke module, MPa | 69 |
| Nominal internal diameter of the production line of subsea tree system and choke module, mm | 130 |
| Nominal inner diameter of the annulus access line, mm | 52 |
| Pressure in the control system of shut-off and control valves of subsea tree system and choke module, MPa | 34,5 |
| Pressure in the control system of downhole shut-off valves and chemical reagents supply system, MPa | 69 |
| Maximum design temperature, °C | 121 |
| Minimum design temperature, °C | -18 |
| Minimum design temperature (behind the throttle valve of the choke module, at well start-up), °C | -29 |
| Maximum ambient temperature (air in storage), °C | 50 |
| Minimum ambient temperature (air in storage), °C | -40 |
| Seismicity of areas of operation according to the 12-point seismic intensity scale MSK-64 according to GOST (State Standard) 30546. 1, points | 9 |
| Overall dimensions, m | 5300 х 4300 х 4400 |
| Actual weight no more than, t | 55 |
| Lifetime, years | 30 |