Phase I Reservoir Development—Redrilling and Flow Testing

In early 1977, the condition of the two deep boreholes at Fenton Hill was as follows: The GT-2 borehole had been drilled to a depth of 9,619 ft (2,832 m) and a 7 5/8-in. scab liner had been placed and cemented from 8,973 ft to 9,581 ft, leaving a 38-ft “rat hole” below the liner (see Fig. 3.12). The EE-1 borehole had been drilled to a depth of 10,053 ft (3,064 m) and cased from 9,599 ft to the surface with a composite casing string (999 ft of 7 5/8-in. casing from 9,599 to 8,600 ft, and 8 5/8-in. casing above 8,600 ft—see Fig. 3.26).