sentences:  Production is performed using four small unmanned steel satellite wellhead platforms.The A1D platform and the A2D platform were built in 1989 by UiE Scotland in Glasgow, and have 5 and 6 wells respectively in Amethyst East.B1D and C1D were built in the following two years and currently produce from 4 and 7 wells in Amethyst East and Amethyst West respectively.