Development Wells At Fenton Hill HDR Geothermal Area (Dash, Et Al., 1983)

From Open Energy Information

Exploration Activity: Development Wells At Fenton Hill HDR Geothermal Area (Dash, Et Al., 1983)

Exploration Activity Details
Location Fenton Hill HDR Geothermal Area
Exploration Technique Development Wells
Activity Date 1974 - 1979
Usefulness useful
DOE-funding Unknown

Construction of the world's first HDR geothermal reservoir began at Fenton Hill in 1974. The injection (hole EE-1) and production (hole GT-2B) wells were drilled into the target formation and were then connected by hydraulic pressure stimulation of joints and fractures within the rock mass. Two shallow reservoirs were created during the early stages of the project, and are collectively referred to as the Phase I reservoirs. A shallow reservoir was originally created in jointed biotite granodiorite at a depth of about 2,500 m with an initial rock temperature of 185°C. Heat-extraction and flow testing experiments were conducted in this reservoir from January 27 to April 13, 1978. A second, larger reservoir was created after cementing the fracture-to-wellbore connections in well EE-1 at 2,930 m depth and refracturing 200 m deeper, in the first of a series of pressure stimulation experiments that would become known as the Massive Hydraulic Fracturing (MHF) Tests (refracturing was accomplished during experiments 203 and 195). The average initial rock temperature of the final Phase I reservoir was 197°C. Flow and heat-extraction tests were run in the second reservoir from October 23 to November 16, 1979.


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