E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/24 (2006.01)
Patent
CA 2700737
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.
L'invention porte sur un système de chauffage pour une formation souterraine. Le système de chauffage comprend trois dispositifs de chauffage sensiblement en forme de u dont les premières parties d'extrémité sont couplées électriquement à un seul transformateur en étoile triphasé et dont les secondes parties d'extrémité sont couplées électriquement entre elles et/ou à la masse. Les trois dispositifs de chauffage peuvent entrer dans la formation à travers un premier puits de forage commun et sortir de la formation à travers un second puits de forage commun de telle sorte que les champs magnétiques des trois dispositifs de chauffage s'annulent au moins partiellement dans les puits de forage communs.
Shell Internationale Research Maatschappij B.v.
Smart & Biggar
LandOfFree
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