Vacuum pumping of conductor-in-conduit heaters

United States of America Patent

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Sep 16, 2008
Grant Date
Dec 8, 2005
app pub date
Apr 22, 2005
filing date
Apr 23, 2004

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Expired

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Abstract

Certain embodiments provide a method that includes placing a heater element in an opening in a subsurface formation. The heater element is in a conduit. A pressure is reduced inside the conduit to a pressure below the vapor pressure of water at the temperature in the conduit.

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Patent Owner(s)

Patent Owner	Address
SHELL OIL COMPANY	P O BOX 2463 ONE SHELL PLAZA HOUSTON TX 77252-2463

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E21B:EARTH OR ROCK DRILLING

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Inventor Name	Address	# of filed Patents	Total Citations
Vinegar, Harold J	Bellaire, TX	339	71819

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Vacuum pumping of conductor-in-conduit heaters

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United States of America Patent

11112856

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PATENT NO	7424915
APP PUB NO	20050269092A1
SERIAL NO	11112856
DOCKET NO

US Family Size	Non-US Coverage
Patent Longevity Expired	Forward Citations

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
September 16, 2008	US,7424915,B2 US7424915B2	GRANTED PATENT AS SECOND PUBLICATION
December 08, 2005	US,20050269092,A1 US20050269092A1	FIRST PUBLISHED PATENT APPLICATION

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11112856

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