| Title | Two·phase flow phenomena in a geothermal reservoir |
|---|---|
| Authors | Shoji, T., Hirakawa, S., Obara, K., Nakamishi, S., Shinohara, N. |
| Year | 1988 |
| Conference | Japan International Geothermal Symposium |
| Keywords | |
| Abstract | The fluid in a water-dominant geothermal reservoir is generally compressed water. When it is sent to the electric power station, it flashes in the reservoir or a well. Accordingly, the fluid consists of two phases of vapor and water in the power station. Among them, only the vapor is used for the electric power generation except the binary system. The vapor sent to the generator is generally gathered from several wells. The properties of the vapor of each well changes as a function of the wellhead pressure as well as the reservoir pressure. For instance, the drop of wellhead pressure relates to the increase of flow rate and the decrease of temperature. The degree of the change depends upon the properties of the geothermal fluid. In some case, the vapor may separate in the reservoir. The flashing pOint, where the vapor forms its own phase in the geothermal fluid, is dependent on the wellhead pressure and the reservoir one. The control of the wellhead pressure is, therefore, very important to optimize the power generation process. We have been examining the two-phase flow phenomena as one of the fundamental studies for the optimization. The Onikob~ geothermal field is a suitable place to know the relation between the wellhead pressure and the flashing point. This report is a part of the results. |