State-Of-The-Art Technologies and Engineering Approach to Production Logging of Penta Lateral Electrical Submersible Pump Driven Offshore Wells

Abstract

As the number of multi-lateral complex wells and advanced completions deployment rises, the demand for advanced and reliable Coiled Tubing (CT) intervention and logging solutions is also increasing. Well complexity is associated with the number of laterals, extended-reach open-hole, complex well trajectories, and the use of advanced completions such as Electrical Submersible Pumps (ESP), Inflow Control Valves (ICV), Inflow Control Devices (ICD), and other completion accessories. This paper provides a comprehensive engineering approach for logging multi-lateral wells with slim ESP completions. Technologies play a major role in enabling CT logging in complex wells. The state-of-the-art electrical CT multi-lateral re-entry tool is a key enabler to locate and access the laterals, and specialized logs are utilized to verify the location of the intended laterals. Another enabler in multi-lateral logging is the retractable logging tool, which provides flexibility to navigate across the open-hole junctions and windows, minimizing the risk of damaging the logging tools. The level of complexity increases when these multi-lateral wells are completed with ESP, especially in an offshore environment. Special tools must be used to pass through the ESP slim completion, and the CT Bottom Hole Assembly (BHA) must be compact to comply with the offshore environment space limitation. The engineering approach, through proper per-job simulation and risk assessment evaluation, besides selecting the right BHA tools, was an essential factor in completing complex logging operations safely and successfully. Moreover, a decision-making tree with live engineering support to guide the operational team to the right action played a role in a successful operation. Additionally, the synergy between engineering and operation is another aspect of success, to make timely decisions during the operation. The presented state-of-the-art technologies and engineering approaches were proven effective in logging multi-lateral slim ESP completions successfully verified on a Penta lateral ESP-driven well.