G Geothermal drilling operations constitute a critical stage in geothermal resource development. however, their implementation is often challenged by various technical problems that can disrupt drilling operations, increase operational costs, and extend non-productive time (npt). one of the most common drilling problems is stuck pipe, a condition in which the drill string becomes immobilized inside the wellbore and cannot be rotated, pulled out, or lowered due to being stuck. in addition to stuck pipe, lost circulation is another common issue encountered in geothermal drilling because geothermal formations generally exhibit high fracture density and permeability. lost circulation prevents drilling fluid from returning to the surface, thereby significantly reducing its ability to transport drill cuttings out of the wellbore. as a result, cuttings accumulate at the bottom of the hole, increasing the risk of stuck pipe. this study was conducted on geothermal well ab-3.4 in the aps geothermal field, where a stuck pipe incident occurred during drilling. in the same hole section, severe lost circulation also occurred, preventing drilling mud and cuttings from circulating back to the surface. this lost circulation was associated with the presence of altered tuff breccia and altered andesite breccia formations, which contain large interconnected voids and relatively weak rock characteristics that readily absorb drilling fluid. therefore, an evaluation was required to identify the mechanisms, mitigation methods, and preventive measures for stuck pipe in order to minimize the occurrence of similar incidents in future drilling operations.this research employed both qualitative and quantitative approaches by collecting operational data from the daily drilling report (ddr), daily mud report (dmr), final well report (fwr), and the company\\\'s drilling database. the collected data were analyzed to determine the relationship between drilling parameters and the occurrence of stuck pipe. the evaluation included formation analysis, actual survey evaluation, drilling parameter evaluation, aerated drilling evaluation, drill bit performance evaluation, circulating system equipment evaluation, and hole cleaning assessment. the results of each evaluation were then correlated to identify the primary mechanism responsible for stuck pipe and to investigate the relationship between lost circulation and hole cleaning efficiency.the results indicate that the stuck pipe interval is dominated by igneous rocks in the form of andesite lava with relatively hard mechanical properties, whereas the overlying interval consists of altered tuff breccia and altered andesite breccia formations, which are responsible for the occurrence of lost circulation. the loss of drilling fluid circulation prevented the return flow of drilling fluid to the surface, significantly reducing the efficiency of cuttings transport. consequently, cuttings accumulated at the bottom of the wellbore, resulting in poor hole cleaning that eventually developed into a mechanical sticking mechanism caused by cutting pack-off. based on the evaluation results, this mechanism was identified as the primary cause of the stuck pipe incident.the mitigation efforts implemented in the field initially involved the work on pipe method by repeatedly moving the drill string upward and downward in an attempt to free the stuck pipe. however, because the drill string could not be released and eventually became parted, a blind back-off operation was subsequently performed to disconnect and recover the free portion of the drill string, allowing drilling operations to continue. based on the evaluation results, the recommended preventive measures for future drilling operations include continuous monitoring of drilling parameters, particularly stand pipe pressure (spp), torque, and hook load, prompt and effective lost circulation treatment, proper control of aerated drilling parameters, regular evaluation of drill bit performance and the circulating system, and optimization of hole cleaning to ensure efficient cuttings transportation. by implementing these preventive measures based on the comprehensive evaluation, the likelihood of stuck pipe incidents in future drilling operations at the aps geothermal field is expected to be significantly reduced, thereby improving drilling efficiency and minimizing non-productive time (npt).