| Title | Temperature Variation with Time in a Perennially Boiling Well in the Long Valley Caldera, Mono County, California: Observations in Chance No. 1 (1976-1983) |
|---|---|
| Authors | Diment, W. H.; Urban, T. C.; Nathenson, Manuel |
| Year | 1985 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Exploration; Reservoir Engineering; USA; California; Mono; Long Valley Caldera; Temperature Gradients; Reservoir Models; Conceptual Models; Geologic Model |
| Abstract | Chance No. 1 was drilled to a depth of 245.4 m and cased to a depth of 72.2 m in 1961. Temperature logs were obtained in 1976, 1982 and 1983, with the casing open to the atmosphere. Water was boiling at the surface of the fluid column on each occasion. Temperatures within the upper part of the cased interval remained virtually identical over the 7 year period. The small difference observed can be ascribed to convective motions in the large diameter (33 cm) casing and the large geothermal gradients (<1°C/m). Temperatures reach a maximum (134°C) just above the bottom of the casing, but abruptly decrease a few degrees just below the bottom of the casing. Temperatures continue to decrease slightly toward the bottom of the open hole (diameters 30 cm) in an irregular manner, suggesting multiple water flows along the hole. |