Research on the Influence of Lowering Speed on the Top Hook Load during the Lowering Process of Deep - Sea Oil Systems

This article focuses on the descending process of part of the pipeline in deep-sea oil systems within directional wells. By utilizing ABAQUS finite element software, a beam model of the deep-sea oil system and a rigid body model of the directional well are established. Through simulations under different descent speed conditions, the relationship between descent speed and the load at the top of the system is explored in depth. The study finds that there is no significant correlation between the load in the X and Y directions and the descent speed, while the load in the Z direction is closely related to and negatively correlated with the descent speed. As the descent speed increases from 0m/s to 0.5m/s, the load in the Z direction decreases from about 1760KN to about 1540KN, consistent with the characteristics of a quadratic function graph. When the speed decreases, the load in the Z direction increases, and there are notable rising and falling edges during speed variation. During the system's descent process, the elastic potential energy increases with negative displacement along the Z-axis. An increase in descent speed leads to a higher peak of elastic potential energy, and changes in elastic potential energy affect the system's force balance, consequently altering the load in the Z direction. Additionally, during uniform descent, the system remains relatively stable without the need for additional adjustment interventions. This study provides an important theoretical basis for the safe and stable operation of deep-sea oil system descent operations.