SUBSEA CHEMICAL INJECTION UNIT FOR ADDITIVE INJECTION AND MONITORING SYSTEM FOR OILFIELD OPERATIONS

摘要

A system monitors and controls the injection of additives into formation fluids recovered through a subsea well. The system includes a chemical injection unit (150) and a controller (152) positioned at a remote subsea location. The injection unit uses a pump to supply one or more selected additives from a subsea and/or remote supply unit. The controller operates the pump to control the additive flow rate based on signals provided by sensors measuring a parameter of interest. A one mode system includes a surface facility (110) for supporting the subsea chemical injection and monitoring activities. In one embodiment, the surface facility is an offshore rig that provides power and has a chemical supply that provides additives to one or more injection units. In another embodiment, the surface facility includes a relatively stationary buoy and a mobile service vessel. When needed, the service vessel transfers additives to the chemical injection units via the buoy.