The tree is an assembly at the opening leading to the top of the well, including valves for measurement and maintenance, safety systems, and an array of monitoring instruments.The tree connects the production line and outlet pipe from the well well and ACTS as an important barrier between the top of the well and the external environment.It includes a number of valves that can be used to regulate or prevent the flow of steam, natural gas and liquids from the well.The tree is connected to the production manifold system via subsea pipelines.