Method and apparatus to provide electrical connection in a wellhead for a downhole electrical device
US7552762B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2006 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Dec 13, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/0385
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Wellhead assembly and method for providing a power connection to a downhole electrical device, such as a heater. Pressure-containing wellhead body members enclose a vertical wellbore and support therein an isolated tubing hanger and a grounding tubing hanger. The isolated tubing hanger suspends a conducting tubing string, 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, an 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 housing and conducting portion to electrically isolate the housing portion. Hot electrical connection is made for electrical connection to the conducting portion of the isolated tubing hanger or the conducting tubing string. Electrical isolation seals and electrically isolates the hot electrical connection from the wellhead body members. Grounding connection is provided to a wellhead body member. A source of current provides a first connection to the hot electrical connection and a second connection to th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.