Wells – Above ground apparatus – Suspension means
Reexamination Certificate
2011-04-05
2011-04-05
Neuder, William P (Department: 3676)
Wells
Above ground apparatus
Suspension means
C166S379000, C166S382000
Reexamination Certificate
active
07918271
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 the grounding connection.
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“Specification for Wellhead and Christmas Tree Equipment,” ANSI/API Specification 6A, Nineteenth Edition, Jul. 2004, pp. 1-20.
Khazanovich Abram
Khazanovich Irina
Kwasniewski Nathan
Greenlee Sullivan PC
Harcourt Brad
Neuder William P
Stream-Flo Industries Ltd.
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