Three-phase heaters with common overburden sections for heating subsurface formations
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United States of America Patent
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Feb 14, 2012
Grant Date -
Aug 6, 2009
app pub date -
Oct 13, 2008
filing date -
Oct 19, 2007
priority date (Note) -
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Abstract
A heating system for a subsurface formation is described. The heating system includes three substantially u-shaped heaters with first end portions of the heaters being electrically coupled to a single, three-phase wye transformer and second end portions of the heaters being electrically coupled to each other and/or to ground. The three heaters may enter the formation through a first common wellbore and exit the formation through a second common wellbore so that the magnetic fields of the three heaters at least partially cancel out in the common wellbores.
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