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Table 1 List of wells with reported temperatures above the critical point of water (374.15 °C)
Country | Site (depth) | P/T | Permeability/fractures | References |
|---|---|---|---|---|
Italy | Sasso-22 (4092 m) | 380 °C at 3970 m during stop of drilling | Highly fractured down to bottom | Bertini et al. (1980) |
San Pompeo 2 (2966 m) | >400 °C, >240 bar | Fractured in 2930 m, no fractures between 2300 and 2930 m | Batini et al. (1983) | |
Carboli 11 (3455 m) | 427 °C @ 3328 m | |||
San Vito 1 (3045 m) | 419 °C BHT (1 week after end of drilling) | Permeability available | Baron and Ungemach (1981) | |
Iceland | NJ-11 (2265 m) | >380 °C, possibly 220 bar | Permeability, low vertical permeability | Steingrimsson et al. (1990) |
RN-17 (3082.4 m) | 320–380 °C BHT from extrapolated temperature logs and fluid chemistry information | Permeability about 300 m above total depth | Marks et al. (2010) | |
IDDP-1 (2104 m) | Wellhead: 450 °C, 140 bar, BHT: molten magma | Permeability, production 10–12 kg/s steam | Friðleifsson et al. (2014) | |
K-36 (2501 m) | Possibly superheated conditions at >2 km | Permeability available | Friðleifsson et al. (2010) | |
K-39 (2865 m) | Freshly quenched silicic glass, 385.6 °C at 2822 m in drill pipe shortly after end of drilling | Feed zone in 100 m distance from intrusion | Mortensen et al. (2010) | |
IDDP-2 (4659 m) | 427 °C, 340 bar, 6 days after end of circulation | Permeability indicated | Friðleifsson and Elders (2017) | |
Japan | Kakkonda, WD-1a (3729 m) | 500 °C | No permeability, little fracture density in the ductile part | Kato et al. (1998) |
US | Wilson No 1 (3672 m) | 325 °C unequilibrated (30 h after end of circulation), 400 °C from fluid inclusions, high-pressure fluid zone during drilling, 489 bar indicated by mud weight | Steam entry at 3631, in sidetrack A2 (3762 m) 3.5 kg/h steam entry at 3762, pressure declining | |
Prati-32 (3396 m) | 400 °C @ 3352 m | Fluid entry at 3352 m, 10.6 kg/s steam at a normalized pressure of 6.9 bar | Garcia et al. (2016) | |
IID-14 (2073 m) | 390 °C, 207 bar at TD | Total circulation loss below 2033 m | Kaspereit et al. (2016) and DOGGR online well records (1990) | |
KS-2 (2440 m) | 342 °C and 146 bar @ 1676 m, supercritical conditions extrapolated at TD | Permeability below 1965 m; 4 kg/s steam @ 12 bar wellhead pressure during flow testing | Iovenitti and D’Olier (1985) | |
KS-13 (2488 m) | 1050 °C | Injectivity above the intrusion | Teplow et al. (2009) | |
Lanipuna-1 (2557 m) | BHT: ≥363 °C 32 h after end of circulation | Low permeability, conductive temperature gradient | Campbell and Gardner (1981) | |
Mexico | H-8 (2300 m), H-11 (2376 m), H-12 (2984 m), H-26 (2546 m), H-27 (2584 m), H29 (2186 m), H-32 (2186 m) | >380 °C estimated, young intrusions at H-12 and H-26 | Circulation loss close to bottom, overall low permeability | Espinosa-Paredes and Garcia-Gutierrez (2003) |
Kenya | MW-01 (2198 m) | 391 °C | Permeable zones identified at 1200–1400, 1600–1750, and 1900–2008 m depth | Kipyego et al. (2013) |
MW-04 (2118 m) | Fresh quenched glassy cuttings during drilling, 390 °C during flow testing, 140 bar shut-in, 20 bar flowing conditions | Low permeability above molten magma; permeability noted between 1700 and 1800 m depth | Sekento (2012), Kipyego et al. (2013) and Mbia et al. (2015) | |
MW-06 (2172 m) | Fresh quenched glassy cuttings, 325 °C | Low permeability above molten magma; permeability noted between 1802 and 2002 m depth |