Patent ID: 8800662

Claim:
A method for controlling a subsea completion or workover assembly in a subsea well having a subsea tree member with a bore landing shoulder for receiving a tubing hanger, the method comprising: (a) providing the subsea tree member with a subsea tree member communication passage leading from an exterior of the subsea tree member to an upward facing subsea tree member port in the landing shoulder; (b) connecting a riser from the subsea tree member to a platform at a sea surface; (c) providing the tubing hanger with a landing surface and a downward facing tubing hanger port on the landing surface, the tubing hanger having a tubing hanger communication passage leading through the tubing hanger from the tubing hanger port to an upper end of the tubing hanger; (d) securing a string of tubing to the tubing hanger, securing the tubing hanger to a running tool assembly and linking the tubing hanger communication passage to the running tool assembly with a running tool communication line; (e) running the tubing hanger, the tubing, and the running tool assembly through the riser to land the landing surface on the landing shoulder and registering the tubing hanger port with the subsea tree member port, thereby connecting the subsea tree member communication passage with the running tool assembly via the tubing hanger communication passage and the running tool communication line; and (f) supplying hydraulic fluid pressure and electric potential to the running tool assembly and performing operations with the running tool assembly, wherein at least one of the hydraulic fluid pressure and the electric potential is supplied via the subsea tree member communication passage, the tubing hanger communication passage and the running tool communication line.