| 摘要 |
A wellhead system comprises a wellhead of a subterranean well, a coiled tubing hanger 4 within a coiled tubing hanger extension 6, a seal 22 inside the coiled tubing hanger extension., the seal and the coiled tubing hanger define a sealed space within the hanger. Coiled tubing 8 extends into the sealed space. Electrical cable 20 extends through the seal and sealed space and into the coiled tubing wellhead. Connector 18, 16 extends through the seal and allows current to flow from the surface downhole to an electrical tool, such as an electrical submersible pump, suspended at the end of the coiled tubing 8. A second seal 36 may also be fastened to the top of the wellhead for additional protection. Thus a potential mode of failure resulting from downhole fluid being ejected from inside the coiled tubing into the space inside the hanger extension is alleviated. |
