From readily available sources - the FPSO (Floating Production,Storage and Offtake Vessel) connects at the bow to a floating, anchored mooring that connects to the well heads. The FPSO may havethe capacity to separate oil, water, sand and gas depending on the requirements of the field. Water and gas are normally returned to the formation to provide 'lift' nowadays as flaring of gas and disposal of water into the sea is generally frowned upon.