Analysis of Axial Oscillation System for Reducing Torsional Vibration during Drilling Horizontal Field A

Abstract

The challenge of drilling in the instability of oil world price, requires innovation and technology applications to optimize drilling implementation. Torsional vibration (stick slip) are slowing down drilling operations and increasing drilling costs. Therefore, to mitigate these problems, the use of Axial Oscillation Generator System (AGT) is considered. AGT 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 was obtained from the drilling  operation of the well A. The method was performed by evaluating the use of AGT in the Bottom Hole Assembly (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 B, which had high stick slip.

The result of data analysis shows that the use of AGT tool on drilling of well A is more effective and efficient approximately 60% - 80%, 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 AGT tool is compatible with BHA component (Mud Motor / RSS /  WD / LWD) as no problems was caused by AGT on the dynamic data of drilling well A. By comparing the two wells, the use of AGT on well A proved the ability to reduce the stick slip and increase weight transfer, thus  educing the cost of drilling.

The expected result of this analysis is a reference to the use of AGT tools as a component of BHA that can reduce the potential hazards of stick slip vibrations and expected to improve drilling efficiency in terms of time and cost.