Evaluation of Palinpinon Reinjection Wells for the Top Zone Plugging Option Using Liquid LCM

Abstract

Ten reinjection wells in the Puhagan sector of the of the Palinpinon geothermalfleld were evaluated for their viability in the proposed top zone plugging work-over scheme using the "liquid LCM" method. This work-over technique is one of the mitigating measures being considered to alleviate the problem on thermal deterioration among production boreholes due to reinjection returns. This win be carried out by sealing ofthe highb communicative, shallow permeable zones within the nearby reinjection wells. This scheme involves the utilization of a mixture composed of calcium chloride and sodium silicate to isolate the anmilus of the weu's slotted liner section before conventional cement plugging is conducted to seal ofthe recalcitrant permeable zones. Evaluation results revealed that the top zone plugging option could be conducted on three particular reinjection wefls. The eventual work-over of these wells is being eyed to give substantial remedy to the problem on reinjection returns in the Palinpinon geothermal fleld.