Abstract: A riserless intervention system for offshore intervention of a well from a vessel includes a lubricator pipe configured to connect with the top of the well and a tool string is configured to be arranged in the lubricator pipe. A closing part is arranged at a pipe end and configured to close fluid communication through an opening of the end of the lubricator pipe to allow the lubricator pipe to be filled with fluid before being connected to the top of the well.

Abstract: The present invention relates to a riserless intervention system for offshore intervention of a well from a vessel by means of a tool string, the vessel having a waterline and the well having a top, the riserless intervention system comprising a lubricator pipe comprising a first end and a second end, the second end being configured to connect with the top of the well, the first end having a first opening and the second end having a second opening, and the tool string configured to be arranged in the lubricator pipe, wherein a closing part is arranged at the second end and configured to close a fluid communication through the second opening of the second end of the lubricator pipe in order to allow the lubricator pipe to be filled with fluid before being connected to the top of the well. Furthermore, the present invention relates to a riserless intervention method for offshore intervention of a well from a vessel by means of a riserless intervention system according to the present invention.