Adjusting the Well Output Curves of the Miravalles Geothermal Field, Costa Rica

Abstract

Estimation of the mass production of the Miravalles Field wells has been done based on the use of the James method. Well output curves were constructed by using data taken from well testing and then improved through statistical analysis. The output curves of the production wells of Miravalles are defined to be as one out of four correlation types: linear, quadratic, elliptic and Antoine (modified), based on the physical behavior of the wells and the least-squares calculation.
These correlations are input into worksheets and another piece of homemade software in order to calculate production and injection mass flowrates. Not only are special unsteady state processes like the integration of a separation station into the production system calculated but also the information is fed into a mass production database which is extremely necessary for field management and for the modeling of the geothermal field.