Analisis Productive Time-Non Productive Time Dalam Operasi Drilling Panas Bumi Pada Sumur “Cool”

Abstract

This case study encompasses the entire operational phases of geothermal drilling in the "Cool" well. The drilling operations adhered to a tight schedule, and delays incurred during the process would result in high costs. The majority of workdays in the drilling process were allocated to wellbore construction and supporting activities, contributing to Productive Time (PT). Meanwhile, significant portions of this process were dedicated to addressing unforeseen challenges, leading to Non-Productive Time (NPT). This paper evaluates the extent of Non-Productive Time (NPT) associated with the "Cool" well. Additionally, it identifies the causative factors and impacts of NPT. Ultimately, the paper provides recommendations to enhance Productive Time (PT) while minimizing Non-Productive Time (NPT), thereby improving drilling efficiency. The geothermal drilling process for the "Cool" well consists of four sections. The study reveals that the largest NPT category is RREP, accounting for 74% (47.5 hrs), followed by SFAL at 18% (11.5 hrs), STUC at 5% (3.5 hrs), REAM at 2% (1.5 hrs), and KILL at 1% (0.5 hrs). The total NPT for the "Cool" well is 64.5 hours. The actual operation of the "Cool" well took 47.7 days to reach the Target Depth of 2107 mMD. A comparison with the initial plan shows a savings of 0.3 days to achieve the same depth. In the absence of NPT, the well could have reached the depth in 45.2 days, representing a time savings of 2.5 days. Assuming a drilling operation cost of USD 114,444 per day, the drilling operation could save approximately USD 286,110. These findings underscore the importance of addressing and mitigating NPT to optimize drilling efficiency and reduce operational costs.