Experimental Setup for Analyzing Torsional Vibrations in Casing Strings: Initial Findings and the Path Forward

Abstract This paper introduces an experimental model of a casing string designed to analyze and understand its dynamic behavior during installation operations that necessitate rotation. Casing rotation is a known method to reduce axial drag and reach TD, especially in MFHW. By focusing on torsional vibrations, we aim to uncover key insights into the frictional interactions and vibration modes that occur during casing running situations, especially rotating while running. We developed a 20-foot-tall experimental setup that simulates the dynamic behavior of a running casing string. Using downscaled 3/8" diameter aluminum alloy tubing to represent downscaled casing stiffness, the setup incorporates rotary sensors along the tubing and a bottom brake at the lower end to generate torque. This system replicates the interactions between rotation speed and torque. We capture real-time and high sampling rate data and analyze how these variables affect the system’s dynamic performance during casing running. The experiments revealed a direct correlation between rotation speed, acceleration, system friction, and torque in casing running operations. As the speed increased, torque rose, indicating higher frictional resistance and a reduction of torsional vibrations. Higher accelerations amplified these vibrations, which can have a detrimental impact on loads across the casing string and operational efficiency, as demonstrated by the experimental model's successful simulation of the operational dynamics. These realizations are essential for optimizing operational parameters to reduce vibrations, improve performance during case runs, and prevent damage.