Abstract
This paper develops a simulation-based model to derive critical maintenance parameters towards optimizing a deep drilling rig availability and maintenance costs. Full factorial analysis is performed to derive the effects and interactions of the derived parameters, based on which ones with a significant effect on the availability and maintenance cost are selected. The case study based model incorporates maintenance, spares and workforce strategies for a geothermal drilling rig. The results offer essential maintenance decision support to both the management and maintenance team of the company and have the potential of further offering insights that eventually reduce the cost of drilling.
Highlights
The results depict that the Ar increases by 28.4% from 67% to 86% and the Cm reduces by 32.7% from €275626 to €185540 as the the PM interval (TPM) varies from 240 hours to 800 hours. This is attributed to a decrease in the number of preventive maintenance (PM) activities. This can be assisted by the employment of predictive maintenance, which at relatively low cost will ensure that the lube is within the required quality standard
While evaluating the main effect sizes impact on Ar, it can be seen that TPM had the most significant impact, with an average increase of 4.06%
From the analysis of the results, the preventive maintenance interval and workforce distribution were shown as the critical maintenance-related parameters significantly influencing the optimization of the rig availability and maintenance costs
Summary
Drilling is a significant operation in geothermal energy production. Geothermal energy is realized by tapping the underground steam by employing deep drilling rigs. The productivity and output of the geothermal plant, depends on the reliability of the drilling rig equipment and related support systems. A decline in the drilling rig reliability due to downtime or non-productive time can be attributed to two main factors: firstly, high non-productive time (NPT) can be occasioned by both operational and maintenance aspects. NPT can be caused by external factors like the rock structure that could necessitate even the abandonment of a well.
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