SAFETY TOOL ANALYSIS FOR PTS INSIDE GEOTHERMAL WELL IN FLOWING CONDITION USEING CABLE FORCE MODELING METHOD

• Main Author: NURULFUAD (NIM : 22610002); Pembimbing : Jooned Hendrarsakti Ph.D.; Zuher Syihab, S.T, Ph.D., HARRY
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20161
• Institution: Institut Teknologi Bandung

Cable force modeling (CFM) was developed to analyze the safety condition of PTS tool inside the wellbore at flowing conditions. This analysis done to reduce failure at the time of testing PTS mainly doe to the upward push of the fluid, this is usually occurs because the fluid force worked to the tool is greater then force of gravity and the tool could be thrown onto the surface (blow up). The purpose of this study was to analyze the safety condition of PTS tool inside the well at flowing condition using CFM method. This CFM method analysis performed by three conditions which is looking for optimum pressure at the wellhead, made additional load, and evaluate the speed of tool in the well. To complete the CFM calculation, first conducted a study to determine coefficient of drag through the study of literature, using field data and the calculation of flow simulation. From the literature obtained the value of drag coefficient at 0,81–1,00. While through calculations using field data values derived drag coefficients were in the range 0,47–1,20, the value is depends on the fluid properties at the wellhead. Meanwhile the results of flow simulation, the drag coefficient that can be used only on dryness 1(0,70 – 0,93). The results of the evaluation from CFM method using variations in pressure at the wellhead to the well-1W HLS, HLS and HLS-2W-3W can be concluded that the testing performed on a safe condition where the fluid is a total force greater than gravity tool. The second condition for the simulation of additional load on tool in the well HLS-3W, the obtained results are not satisfactory because of the configuration tool too long due to the addition of the load and the effect on the calculation of drag force and bouyancy force. The third condition for velocity evaluation, the tool velocity can be optimized reach 0.7–0.8 m/s.