COIL TUBING INJECTOR INTEGRATED HEAVE COMPENSATION AND A COIL TUBING HEAVE COMPENSATION METHOD

摘要

A coiled-tubing injector (1) is described, comprising an injector head (13) provided with driving means (131, 132) arranged to displace a coiled tubing (13), and a control unit (133) which is connected to the driving means (131, 132) and is arranged, by means of a first set (I) of control signals, to control the axial displacement of the coiled tubing (4) by the driving means (131, 132), wherein the injector head (13) is supported by a heave compensator (134) forming a connection between a base (33) formed on a floating installation (3) and the injector head, and the heave compensator (134) is provided with one or more heave-compensation cylinders (1342) which are arranged to generate a heave-compensated vertical movement of the injector head (13). A method of heave-compensating a coiled tubing (13) during a coiled-tubing operation in a subsea well (6) carried out from a floating installation (3) is described as well.