64 research outputs found
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Cerro Prieto cold water injection: effects on nearby production wells
The liquid-dominated Cerro Prieto geothermal field of northern Baja California, Mexico has been under commercial exploitation since 1973. During the early years of operation, all waste brines were sent to an evaporation pond built west of the production area. In 1989, cooled pond brines began to be successfully injected into the reservoir along the western boundary of the geothermal system. The injection rate varied over the years, and is at present about 20% of the total fluid extracted. As expected under the continental desert conditions prevailing in the area, the temperature and salinity of the pond brines change with the seasons, being higher during the summer and lower during the winter. The chemistry of pond brines is also affected by precipitation of silica, oxidation of H{sub 2}S and reaction with airborne clays. Several production wells in the western part of the field (CP-I area) showed beneficial effects from injection. The chemical (chloride, isotopic) and physical (enthalpy, flow rate) changes observed in producers close to the injectors are reviewed. Some wells showed steam flow increases, in others steam flow decline rates flattened. Because of their higher density, injected brines migrated downward in the reservoir and showed up in deep wells
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Importance of Natural Fluid Recharge to the Sustainability of the Cerro Prieto Resource
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The Ahuachapan geothermal field, El Salvador: Reservoir analysis
These are appendices F through I of the Ahuachapan Geothermal Field Reservoir Analysis. The volume contains: well logs, water chemistry plots, gas chemistry plots, temperature plots, and flow plots. (JEF
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Effects of pressure drawdown and Recovery on the Cerro Prieto Beta Reservoir in the CP-III Area
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Importance of Natural Fluid Recharge to the Sustainability of the Cerro Prieto Resource
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Gas Geochemistry of the Geysers Geothermal Field
Increases in gas concentrations in Central and Southeast Geysers steam are related to the decreases in pressure caused by heavy exploitation in the 1980s. When reservoir pressures in the central parts of the field decreased, high-gas steam from undrilled reservoir margins (and possibly from underlying high-temperature zones) flowed into exploited central areas. The Northwest Geysers reservoir probably lacks high-gas marginal steam and a decline in pressure may not cause a significant increase of gas concentrations in produced steam
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THE LACK OF IMMEDIATE EFFECTS FROM THE 1979-80 IMPERIAL AND VICTORIA EARTHQUAKES ON THE EXPLOITED CERRO PRIETO GEOTHERMAL RESERVOIR
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The Northwest Geysers High-Temperature Reservoir: Evidence for Active Magmatic Degassing and Implications for the Origin of The Geyers Geothermal Field
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