Is It Possible to Run at High Speed Rotation, Above 3600 RPM, Asynchronous Electrical Submersible System? Myth, or Reality

Abstract

Abstract Over the years, Electro-Submersible Pumps have been considered one of the main Artificial Lift Methods in different fields of the world due to their versatility in handling different well fluids and wide ranges of flow production. However, in many cases, it is not possible to reach the maximum potential of a well due to the perception of avoiding operating the Asynchronous Motors of the ESP system above 3600 RPM because it may induce failures. During the operation of ESP systems, situations may occur during which it may be necessary to operate the motor above the standard frequency 50/60 Hz (3000/3600 RPM) and take advantage of the maximum potential of the well without requiring an immediate intervention. These situations include but are not limited to well productivity index differing from the expected, loss of mechanical transmission in some of the system components, or decrease in efficiency due to wear associated with equipment operation. In the ESP industry there is a design practice of operating frequencies no higher than 60 Hz (3600 RPM) to avoid possible equipment failures associated with rotational instability, high temperatures or poor lubrication in the internal components due to greater friction at higher speeds. The recommended practices or international standards do not have an operating speed limit reference apart from the restrictions that can normally occur in the system, so there is uncertainty in the operating limits of these systems. The main objective of this paper is to verify or disprove the theory of the high speed rotation in 500-series ESPs with Asynchronous Motors (standard technology) with a specific number of wells that were operated at speeds above 4000 RPM.