Fig. shows a well pattern in plan view. The black dashed line indicates the boundaries of one unit of a 5-spot TDF, while the blue solid line shows the boundaries of one unit of a doublet TDF. The fivespot TDF has a power plant located at the injection well and takes one-fourth of the fluid from each of the four neighboring production wells. In contrast, the doublet TDF has a power plant located between the injection and production wells and circulates flow only between these two wells.