| 摘要 |
Wellhead assembly and method for providing a power connection to a downhole electrical device, such as a heater or pump. Pressure-containing wellhead body members enclose a vertical wellbore and support, in vertically stacked relationship, an isolated tubing hanger and a grounding tubing hanger. The isolated tubing hanger suspends a conducting tubing strin g, while the grounding tubing hanger suspends a grounding tubing string concentrically spaced from the conducting tubing string. The isolated tubing hanger has an outer housing, a n inner electrically conducting portion supported by the outer housing operative to provide electrical connection with, and suspend, the conducting tubing string, and insulation between the housin g and conducting portion to electrically isolate the housing portion. A conduit in a wellhead body member provides access to the vertical wellbore proximate the isolated tubing hanger. Hot electrical connection is made through the conduit, for electrical connection to the conducting tubing string. An electrical isolation assembly seals and electrically isolates the hot electrical connection in the conduit from the wellhead body members. Grounding connection is provided to the wellhead body member proximate the grounding tubing hanger. A source of current provides a first connection to the hot electrical connection and a second connection to the grounding connection.</ SDOAB>
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