Grease injection system for riserless light well intervention

A method of operating a subsea lubricator system positioned above a subsea well, said lubricator system comprising a pressure control head, the method comprising:

• monitoring at least one of a pressure within said well and an ambient seawater pressure proximate said lubricator system;
• injecting a lubricant into said pressure control head at a pressure that is a set value greater than said monitored pressure;
• and
• obtaining said lubricant from an accumulator that is positioned subsea and contains said lubricant.

A subsea lubricator system, comprising:

• a lubricator tube adapted to be positioned subsea above a subsea well;
• a pressure control head adapted to be positioned above said lubricator tube;
• at least one pressure sensor adapted for sensing at least one of a pressure in said subsea well or an ambient seawater pressure proximate said pressure control head;
• and
• at least one pump that is adapted to be positioned subsea to inject a lubricant into said pressure control head at a lubricant pressure that is greater than said sensed pressure.