The Damage Effect Determined From Inflow Type-Curves, and its Relation with Production Decline

Abstract

A review is made of the parameters that play a role in the well productivity. Also the characteristic production curves and inflow curves are mentioned as a useful tool, to analyze the well behavior. The theoretical development of the inflow curves, applied to petroleum and geothermal reservoirs is described. The equations to determine the damage effect are shown and the type-curve to be applied to calculate the damage effect from production measurements, is presented. Also in this work it is mentioned that the well production decline is a correlated effect with its exploitation. The analysis of the behavior of the inflow curves of wells located in mexican geothermal fields, is described. The analyzed inflow curves were obtained from production tests carried out in different stages of exploitation. With the overlaying of the data of the dimensionless curves on the graph of the type-curve, the damage values were determined, for each stage in which the production tests were carried out. The obtained results emphasized that the damage value increases with the decline productivity of the wells, which is linked to exploitation time.