Estimating the Improvement of Tanawon Production Wells for Acid Treatment, Tanawon Sector, Bacman Geothermal Production Field, Philippines

Abstract

Production wells TW-1D and TW-2D in the Tanawon sector of the BacMan Geothermal Production Field were initially postulated to may have been damaged by mud after several problems were encountered during drilling. Analysis of the several pressure transient tests conducted in the wells and correlation of the drilling and geoscientific data confirmed the presence of formation damage caused by drilling mud and established the wells as good candidates for acid stimulation.
Flowing pressure, temperature, and spinner logs were also conducted in TW-1D during the medium term discharge tests to examine its wellbore dynamics and discharge characteristics. The availability of these downhole measurements coupled with the results of the pressure transient tests revealed that an effective quantification of the possible improvement of the well before the acid treatment could be undertaken. Modeling of the available welltest data through wellbore simulation further showed at least 50% improvement from the initial production capacity of the well could be realized.