Figure F4. Illustrations and photographs of wellhead OsmoSamplers deployed on CORK-IIs during Expedition 301. (A) OsmoSamplers are mounted on (B) plates with T-handles. The plates are held in place by a submersible and then are locked in position using guides at the base and top. Once the sampler is latched in place by turning the T-handle 90° and the appropriate valves are opened, fluids are obtained through (C) titanium nipples. Given a system that is overpressured relative to hydrostatic, borehole fluids should flow from the nipples to caps with O-ring seals into tubing leading to samplers. If the system is underpressured, a pump (osmotic or mechanical) is required to obtain borehole fluids. The design allows for return flow down the borehole, resulting in a closed system. D. Three samplers being prepared for deployment on the rig floor. E. An OsmoSampler and pressure gauge/discrete fluid sampler attached to the wellhead using an ROV. See GUIDE in CORK in “Supplementary material” for machine drawings of plate, PEEK couplers, and T-handle to access fluids from the wellheads deployed during Expedition 301.
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