Assessment of the Indicators of Circulation Systemof Production Geothermal Energy in the Case of Thin Layer
Exploitation of circulating system for heat extraction in the Tarumovskoye hydrothermal deposit and the assessment of its operation parameters are considered. Simple formulae have been proposed for the natural heating of injected used water along the wellbore, and its associated heating due to the heat of the formation. The results are compared with the production data for the injection wells. Temperature change in time is determined in a thin layer with the heat removal from the covering top and the underlying bottom of the layer. The study is conducted within the framework of the famous Lauwerier model. The decrease in temperature of the layer and supply from the top and the bottom for a long time are investigated. Convenient formulae have been calculated for a pair of wells with equal flow rates. Heat losses along the wellbore for deep-lying strata of the Tarumovskoye deposit are also studied. The temperature losses from the bottom hole up to the wellhead have been calculated, and comparison with heat losses in flowing oil wells are provided. Recommendations are given to start the pilot operation of the GCS from a low power (5 MW). Its life time will be more than 50 years. The return of drilled wells from conservation is possible only if effective methods for preventing from carbonate building-up will be introduced. In the case of mineral components extraction from thermal water, means of purification from phenols are proved to be necessary with tracing of the environmental situation.