Some reservoir engineering calculations for the vapor-dominated system at Larderello, Italy
Open-File Report
75-142
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Abstract
Various reservoir properties are calculated for the Larderello vapor-dominated system using available published data. Bottom-hole flowing properties are calculated from measured wellhead data. Whereas wellhead temperatures measured at a particular time tend to change systematically with changes in flow and pressure, calculated bottom-hole temperatures tend to be constant for two sample wells; while for a third, bottom-hole temperatures decrease with increasing flow. Bottom-hole temperatures calculated from wellhead data taken over several years can be constant, increase, or decrease for particular wells. A steady-state model for steam flow to a well is used with calculated bottom-hole data to show that the effect of non-Darcy flow is important. The initial mass of fluid in place for the northeast zone of Larderello (56 km2) is estimated, using data on shut-in pressures and total mass production. Reservoir thickness needed to store this mass of fluid is calculated as a function of porosity and initial fraction of water in pores. Representative values are 19 km of thickness, assuming 5% porosity with steam alone, and 832 m, assuming 20% porosity and 10% of pore volume as liquid water.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Some reservoir engineering calculations for the vapor-dominated system at Larderello, Italy |
| Series title | Open-File Report |
| Series number | 75-142 |
| DOI | 10.3133/ofr75142 |
| Edition | - |
| Year Published | 1975 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | 47 p.; Tables; Figures |
| Online Only (Y/N) | Y |
| Google Analytic Metrics | Metrics page |