As conventional fishing assembly offers a degree of recovery chance, such chance can be increased by utilizing an Oscillating Fishing Tool (OFT). The OFT is a fishing Bottom Hole Assembly (BHA) component that delivers low-magnitude; high-frequency oscillation. The continuous motion that the tool provides complements the impact generated by the fishing jar. This paper reviews the successful case history in Field X, which was in fact the first utilization of OFT for a fishing application in the field. Method of analysis involve comparing fishing sequence without and with the OFT. The OFT was used in Offshore Field X to recover a mechanically stuck 550-meter long Tubing Conveyed Perforating Gun assembly inside 9 5/8" casing that could potentially lead to loss of access into the 6 oil reserves candidate perforation zones. Initially the assembly had been stuck for two days, during which conventional fishing BHA was used to retrieve it to no avail, even after jarring for most of that time. OFT was then incorporated in the final fishing BHA and operated in combination with jarring operation. After around twelve hours of oscillating and jarring, the fish was able to be released from the initial stuck point. When tripping the string out, however, the assembly was stuck at high dog-leg severity area near the surface. At that point, in combination with applying substantial overpull, OFT was utilized further to recover the entire string. Upon fish retrieval, it was evident that post detonation, the TCP gun had swelled into 8.6 inches in diameter. In summary, oscillating and jarring for thirty-six cumulative hours successfully released the swelled TCP gun assembly from the stuck occurrences. In conclusion, the operation showed that the OFT serves as a higher level of fishing tool option that offers a particular excitation mode to the stuck assembly. Stuck assembly in a cased hole presents potential loss of oil reserves. Particularly in offshore application, the situation can also be costly. With reduced chance of recovery as time passes by, operation is hindered from being able to proceed to the next completion phase. The case proved OFT to have played an important role in improving fishing probability of success and should be considered as standard fishing BHA in the future.
Torsional vibrations (stick slip) and limited reached drilling are slowing down drilling operations and increasing drilling costs. Therefore, to mitigate these problems, the use of Friction Reduction System (FRS) is considered. FRS is a system commonly used to reduce downhole friction during drilling operations. Drilling parameter results are compared with offset well that had high stick slip. The approach was based on qualitative research method, data processing obtained from the drilling operation of the well X. The method was performed by evaluating the use of FRS in the BHA series during the drilling operation. Such method mainly revolves around calculating some drilling parameters such as Torque, Weight on Bit (WOB), Rate of Penetration (ROP), Revolutions per Minute (RPM) and analysing the log results of the tools contained in the Rotary Steerable System (RSS) and Measurement While Drilling (MWD), as well as comparing it with offset well Y, which had high stick slip. The result of data analysis shows that the use of FRS tool on drilling of well X is more effective and efficient compared to well Y, evidenced by drilling parameter such as WOB and Torque that are reduced by around 30%, with downhole and surface RPM being relatively constant, and supported by log results that do not show any signs of stick slip. Furthermore, the use of FRS tool is compatible with BHA component (Mud Motor / RSS / MWD / LWD) as no problems was caused by FRS on the dynamic data of drilling well X. By comparing the two wells, the use of FRS on well X proved the ability to reduce the stick slip and increase weight transfer, thus reducing the cost of drilling. The expected result of this analysis is a reference to the use of FRS tools as a component of BHA that is placed a few feet away from the bits in accordance with its effectiveness level that can reduce the potential hazards of stick slip vibrations and expected to improve drilling efficiency in terms of time and cost.
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