Risk Elimination of Using “Striking Wrench” to be Thrown Off when Tightening or Loosening Connection in Workover and Well Services Activity

Abstract

In PT Pertamina EP’s Annual Work Plan, Workover and Well Service (WOWS) has thousands of work programs. Technically, many repetitive activities have high-risk probability of accidents happened, one of them is stud bolt hammering when tightening or loosening connection uses a striking wrench. Approximately, there are 14,400 times per year of stud bolt hammering activities that have occurred in WOWS PT Pertamina EP Rantau Field. Many safety incidents for stud bolt hammering activities have done in some Indonesia Production Sharing Contract. That work risk has a direct striking on the Company’s Key Performance Indicator (KPI), Total Recordable Incident Rate (TRIR). To achieve the excellence goal in safety performance, we must have the mitigation for all risk which potentially occurred in WOWS. One activity in WOWS that has improper control of the risk is the striking wrench can be thrown off when tightening or loosening connection due to the operator miss strike to the wrench. Authors used the literacy of any International Standard and Company’s Procedure to make a tool’s design that could eliminate the risk when used a striking wrench. After getting insight and proper tool’s design in the previous step, the authors made the 3D model using AutoCAD then simulated the model with ANSYS. The results of engineering steps had to be validated by fabricating the tool and directly using it in the field. Authors called their 3D model as “PeTrik”. From the simulation that had been done, PeTrik could restrain the axial move from a striking wrench. PeTrik could hold the striking force from 7 kg’s hammer without experiencing plastic deformation with a maximum strength of 0.41% from its Yield Strength. Validation said that PeTrik could reduce unsafe action up to 100%. Beside eliminating the risk, PeTrik prevented a striking wrench that fell into the cellar that increases rig efficiency from people and time. From the before, tightening and loosening stud bolt connection used two persons became one person for that activity. And also, we could accelerate up to 40% for tightening or loosening activity.