Patent ID: 8672024

Claim:
A well completion system comprising a subsurface heat exchanger section that includes: an outer shell extending longitudinally the length of each heat exchanger section along an axis; an inner shell extending longitudinally along the axis and having an upper connector, an open inside diameter, one or more inlet boxes, and one or more outlet boxes, and wherein an annular cavity is defined between the outer shell and the inner shell extending longitudinally therebetween; an upper annular ring radially extending between the inner shell and the outer shell, the upper annular ring having one or more openings therethrough; a lower annular ring radially extending between the inner shell and the outer shell and longitudinally spaced apart from the upper annular ring, the lower annular ring having one or more openings therethrough and connected to the upper annular ring via the inner shell and the outer shell; and one or more tubes sealably connected at a first end and a second end to the one or more openings in the upper annular ring and the one or more openings in the lower annular ring, respectively, the one or more tubes extending between the upper and lower annular rings and through the annular cavity.