A free-standing riser system connecting a subsea source to a surface structure (32, 34), the system comprising: a concentric free-standing riser (2, 4) comprising inner and outer risers defining an annulus there between, a lower riser assembly, an upper riser assembly, an LRA production wing valve assembly, an URA production wing valve assembly, a lower end of the riser fluidly coupled to the subsea source through the lower riser assembly and one or more subsea flexible conduits, and an upper end of the riser mechanically connected to a subsea buoyancy assembly (18, 19) and fluidly connected to the surface structure (32, 34) through the upper riser assembly and one or more upper flexible conduits; the LRA comprising a first generally cylindrical member having a longitudinal bore, a lower end, an upper end, and an external generally cylindrical surface, the first generally cylindrical member comprising sufficient intake ports extending from the external surface to the bore to accommodate flow of hydrocarbons from the hydrocarbon fluid source as well as inflow of a functional fluid, at least one of the intake ports fluidly connected to the LRA production wing valve assembly (114A, 114B), the upper end of the first generally cylindrical member comprising a profile suitable for fluidly connecting to the free-standing riser (2, 4), the lower end of the first generally cylindrical member comprising a connector suitable for connecting to a seabed mooring; and the URA comprising a second generally cylindrical member having a longitudinal bore, a lower end, an upper end, and an external generally cylindrical surface, the second generally cylindrical member comprising sufficient outtake ports extending from the bore to the external surface to accommodate flow of hydrocarbons from the riser, and at least one port allowing flow of a functional fluid into the annulus, at least one of the outtake ports fluidly connected to the URA production wing valve assembly for fluidly connecting the second generally cylindrical member with the upper flexible conduit, the upper end of the second generally cylindrical member comprising a connector suitable for connecting to the subsea buoyancy assembly (18, 19), and the lower end of the second generally cylindrical member comprising a profile suitable for fluidly connecting to the free-standing riser (2, 4). a concentric free-standing riser (2, 4) comprising inner and outer risers defining an annulus there between, a lower riser assembly, an upper riser assembly, an LRA production wing valve assembly, an URA production wing valve assembly, a lower end of the riser fluidly coupled to the subsea source through the lower riser assembly and one or more subsea flexible conduits, and an upper end of the riser mechanically connected to a subsea buoyancy assembly (18, 19) and fluidly connected to the surface structure (32, 34) through the upper riser assembly and one or more upper flexible conduits; the LRA comprising a first generally cylindrical member having a longitudinal bore, a lower end, an upper end, and an external generally cylindrical surface, the first generally cylindrical member comprising sufficient intake ports extending from the external surface to the bore to accommodate flow of hydrocarbons from the hydrocarbon fluid source as well as inflow of a functional fluid, at least one of the intake ports fluidly connected to the LRA production wing valve assembly (114A, 114B), the upper end of the first generally cylindrical member comprising a profile suitable for fluidly connecting to the free-standing riser (2, 4), the lower end of the first generally cylindrical member comprising a connector suitable for connecting to a seabed mooring; and the URA comprising a second generally cylindrical member having a longitudinal bore, a lower end, an upper end, and an external generally cylindrical surface, the second generally cylindrical member comprising sufficient outtake ports extending from the bore to the external surface to accommodate flow of hydrocarbons from the riser, and at least one port allowing flow of a functional fluid into the annulus, at least one of the outtake ports fluidly connected to the URA production wing valve assembly for fluidly connecting the second generally cylindrical member with the upper flexible conduit, the upper end of the second generally cylindrical member comprising a connector suitable for connecting to the subsea buoyancy assembly (18, 19), and the lower end of the second generally cylindrical member comprising a profile suitable for fluidly connecting to the free-standing riser (2, 4).