SYSTEM AND METHOD FOR HEATING SUBSURFACE FORMATION

摘要

A system for heating a subsurface formation is described. The system includes a plurality of elongated heaters (244) located in a plurality of openings in the formation. At least two of the heaters are substantially parallel to each other for at least a portion of the lengths of the heaters. At least two of the heaters have first end portions (234) in a first region of the formation and second end portions (238) in a second region of the formation. A source of time-varying current (254) is configured to apply time-varying current to at least two of the heaters. The first end portions of the heaters are configured to be applied with substantially the same voltage. The second portions of the heaters are configured to be applied with substantially the same voltage.