Perpustakaan Digital ITB

This study focuses on evaluating the feasibility of wireline operations in highly deviated wells, with the aim of determining the necessity of deploying a well tractor. In recent years, as oil and gas drilling increasingly targets complex reservoirs through extended-reach and high-inclination wells, wireline operations face new mechanical challenges. In particular, gravity alone may not be sufficient to convey the toolstring to the desired depth, leading to operational risks, increased cost, and potential failure. A model was developed using inputs such as well trajectory (Measured Depth, Inclination, and Azimuth), cable specifications, toolstring specification, and well condition data, including fluid density and wellhead shut-in pressure. This model calculates and visualizes well trajectory in three-dimensional space using the Average Angle Method, and simulates the axial forces acting on the cable and toolstring, including weight, friction, buoyancy, and pressure forces. A custom-built simulation was applied to two real wells from the Mahakam Block: TN-IX78 and TN-IX79. The results showed that for TNIX78, the toolstring would stall at 749 meter measured depth due to insufficient net force, closely matching the actual field data, which reported a stall at 740 meter measured depth. Consequently, the model predicted the required tractoring depth and force needed for successful deployment. In contrast, TN-IX79 did not experience any tool hold-up in the simulation or in actual operation, confirming that a well tractor was not necessary. The study also analyzed stuffing box friction across 23 wells, establishing a moderate correlation with wellhead shutin pressure. The findings demonstrate that the developed model is capable of reliably predicting tool conveyance performance and identifying when a well tractor is required. This enables operators to reduce unnecessary well tractor deployment, thereby optimizing intervention costs.