Patent ID: 8720582

Claim:
Apparatus for providing coiled tubing into a subsea hydrocarbon production well from a waterborne vessel on the surface of the sea, the apparatus comprising: at least one master injector carried by the vessel, having a known weight, positionable proximate to the surface of the water and engaged with the coiled tubing, said at least one master injector being configured and used to the control the movement of the coiled tubing into and out of the well during normal operations; and at least one slave injector engaged with the coiled tubing, deliverable on the coiled tubing from the vessel to the well, controlled independent of said at least one master injector and configured to be repeatedly deployable to and from the well, wherein the weight of said at least one slave injector is less than the weight of each said at least one master injector, whereby the coiled tubing and said at least one slave injector are delivered to the well without the use of one or more risers extending from the vessel to the well, wherein said at least one master injector includes at least one chain configured to directly compensate for motion of the vessel relative to the sea floor when said at least one slave injector is deployed to the well.