Abstract: A method and system are disclosed for subsea processing multiphase well effluents comprising natural gas and liquid from a subsea hydrocarbon containing formation, which system (1) comprises: —a fluid separation vessel (6) which is connected to a downstream end of a multiphase well effluent transportation conduit (7); —a liquid level transmitter assembly (21,22) for monitoring the gas liquid interface (23) in the fluid separation vessel (6); —a liquid enriched fluid transportation flowline (14) connected at or near the bottom (13) of the fluid separation vessel (6) and a gas enriched fluid transportation flowline (12) connected at or near a top (11) of the fluid separation vessel (6); —a pump (17) connected to an electric motor (18); and —a fast acting variable speed drive system, which is coupled to the liquid level controller which adjusts the pump and motor speed setpoint within 2 seconds to maintain the liquid level in the vessel at a predetermined setpoint.

Abstract: A well assembly for intervention of a subsea well or a well head with a wireline or a coiled tubing connected to a tool or a toolstring and including lubricator and an injector package. The injector package is adapted to inject the wireline or coiled tubing into the well or well head. The lubricator is adapted to be fitted in a lubricator package and define a locking chamber via which the wireline or coiled tubing is to be forwarded to the well or well head. The lubricator is adapted to be connected to the well head. The injector package includes an injector module adapted to be fitted to the well head. The injector module is adapted to forward the lubricator through it when the packages are connected to each other and to the well head, for the purpose of injecting the wireline or coiled tubing into the well or well head. The lubricator includes a lubricator pipe element and an associated moveable stripper/packer element adapted to be connected to a well barrier module on the well head.