Riserless marine package

A riserless marine package comprising:

• a housing comprising:
• an upper connection end,
• a lower connection end, and
• a central bore having an inner diameter corresponding to an inner diameter of a central bore of a subsea blowout preventer,
• wherein the lower connection end of the housing fluidly connects the riserless marine package to the subsea blowout preventer;
• a multi-purpose annular packer and latching mechanism comprising:
• an annular packer comprising a central bore having an inner diameter corresponding to the inner diameter of the central bore of the subsea blowout preventer,
• a first upper latching mechanism disposed above the annular packer, and
• a first lower latching mechanism disposed below the annular packer;
• a lower seal group disposed below the multi-purpose annular packer and latching mechanism comprising:
• an upper annular sealing element comprising a central bore having an inner diameter corresponding to the inner diameter of the central bore of the subsea blowout preventer,
• a second upper latching mechanism disposed above the upper sealing element,
• a second lower latching mechanism disposed below the upper sealing element,
• a lower annular sealing element comprising a central bore having an inner diameter corresponding to the inner diameter of the central bore of the subsea blowout preventer,
• a third upper latching mechanism disposed above the lower sealing element, and
• a third lower latching mechanism disposed below the lower sealing element;
• a buffer chamber disposed in between the multi-purpose annular packer and latching mechanism and the lower seal group comprising:
• a central bore having an inner diameter at least as large as a smallest inner diameter of any other component of the riserless marine package,
• a fluid injection port, and
• a fluid return port;
• and
• an annular fluid return port disposed below the lower seal group,
• wherein the riserless marine package is removably attached to the subsea blowout preventer and the central bore of the riserless marine package is in fluid communication with the central bore of the subsea blowout preventer.