Modelling of Chemical and Thermal Changes in Well PN-26, Palinpinon Philippines

Abstract

Significant chloride changes in well PN-26 during its period of exploitation have been mainly attributed to reinjection fluid returns. Here fluid returns are modelled by a simple time-dependent production-reinjection lumped parameter model. Analytic solutions are derived for the cases of constant and variable production rates. The variable production rate model adequately described the chloride changes in well PN-26. The early return of reinjection fluid has also resulted in a substantial decline in the measured temperam in the well. This change in temperature is modelied by coupling the mass balance model to a frslcture flow modeLThe simple heat advection model satisfactorily represents the thermal decline observed in the well.