Boolean
A physical object that is an assembly of pipes and piping parts, with valves and associated control equipment that is connected to the top of a wellhead and is intended for control of fluid from a well.
A flexible vertical or near vertical pipe for the flow of liquid or gas between the seabed and the surface.
A rigid vertical or near vertical pipe for the flow of liquid or gas between the seabed and the surface.
A physical object that is a vertical or near vertical pipe for the upward flow of liquid or gas.