Underwater lubricator and methods for circulating fluids in an underwater lubricator

摘要

Subsea lubricator device, comprising a blowout preventer assembly, a tool housing assembly and a stuffing box, intended to be located at a subsea Christmas tree, and methods of circulating fluids in a subsea lubricator. The device comprises a blowout preventer ( 40 ) and a lubricator ( 60 ). Along the entire length of the device a bypass ( 46, 66 ) is located. The bypass communicates fluid with the device via a fluid connection ( 72 ) at the upper end of the tool housing and via a valve assembly ( 51 ) at the bottom of the blowout preventer. This permits removal of gas or oil being present in the device by circulating the hydrocarbons in the well.