| Abstract |
The Las Pailas II Geothermal Field has a liquid-dominated, two-phase reservoir with temperatures between 230 and 270 °C. Situated on the southern side of the Rincón de la Vieja volcano, this field has been producing 55 MWe from a condensation-type plant since July 2019. This report presents an analysis of six of the twelve producing wells in the field, focusing on the injectivity indices (II) measured post-drilling, along with the productivity indices (PI) gathered during discharge tests carried out in the early phases of field operation. The analyzed data indicate that II and PI exhibit a general first-order relationship with considerable variability. Furthermore, the geographical distribution of the wells reveals variations in the calculated values for both indices. Throughout five years of operation, the evolution of productive parameters has demonstrated significant differences among certain wells, with the most prominent changes associated with fluctuations in enthalpy. However, the overall vapor input from the wells has stayed fairly constant. The combined analysis of the data suggests that the correlation between the two indices is insufficient for forecasting the future potential of the producing wells. It is essential to consider the evolution of fluid enthalpy, as an increase in the vapor fraction does not require high values of II and PI. |