There is described a method for conducting a subsea well intervention at a subsea well, and a related system. In particular embodiments, an assembly is provided comprising a wireline drum pressure container unit, a lubricator package having a lock chamber tube enclosing a tool string and having at least one valve in a vertical bore, and a connector used to connect the assembly to a well control package on a well head of the well. In such an embodiment, the method can include displacing well fluid in a cavity between the valve of the lubricator package and a valve of the well control package, using a clean fluid, while the valve of the lubricator package is closed. The assembly can then be disconnected from said well control package at the connector and retrieved to the surface, whereby contamination of seawater due to disconnection can be reduced or minimized.
E21B 33/072 - Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells for cable-operated tools
E21B 33/076 - Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells specially adapted for underwater installations
E21B 47/10 - Locating fluid leaks, intrusions or movements
A petroleum well intervention winch system includes a high pressure confining housing for a drum for a rope to a tool string. The pressure confining housing has a connector with an aperture for the rope to a top of a tool string gate chamber on vertical bore BOP valves on a wellhead on the petroleum well. The rope runs through the aperture via a capstan to the drum. The capstan is driven by a first motor through a first high pressure proof magnetic coupling across a wall of the housing. The drum is driven by a second motor through a second high pressure proof magnetic coupling across the wall of the housing. The capstan is subject to a load tension from the rope and is provided with a hold tension on the rope from the drum. The second motor exerts a constant hold tension on the rope via the drum.
E21B 23/14 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells
E21B 41/00 - Equipment or details not covered by groups
E21B 41/06 - Work chambers for underwater operations, e.g. temporarily connected to well heads
E21B 47/12 - Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
E21B 19/00 - Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
E21B 33/076 - Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells specially adapted for underwater installations
A petroleum well intervention winch system comprising a high pressure confining housing (1) for a drum (2) for a rope (R) to a tool string (T), characterized by said pressure confining housing (1) having a connector (C) with an aperture (A) for said rope (R) to a top of a tool string gate chamber (G) on vertical bore BOP valves on a wellhead (WH) on said petroleum well, said rope from said tool string (T) running through said aperture (A) via a capstan (3) to said drum (2), said capstan (3) driven by a first motor (35) through a first high pressure proof magnetic coupling (34) across a wall of said housing (1), said drum (2) driven by a second motor (25) through a second high pressure proof magnetic coupling (24) across said wall of said housing (1), said capstan (3) subject to a load tension from said rope (R) from said tool string (T) in said well and provided with a hold tension on said rope (R) from said drum (2), said second motor (25) exerting a constant hold tension on rope (R) via drum (2).
E21B 33/076 - Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells specially adapted for underwater installations
E21B 41/00 - Equipment or details not covered by groups
E21B 41/06 - Work chambers for underwater operations, e.g. temporarily connected to well heads
E21B 47/12 - Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
B66D 1/00 - Rope, cable, or chain winding mechanisms; Capstans
E21B 19/00 - Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
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