Design Method of Rotary Pulse Valve Based on Tubular Mechanics and Fluid Mechanics

Summary Rotary pulse vibration tools are commonly used in coiled-tubing (CT) operations to reduce friction and drag. However, the pulse valve, as its core component, is currently designed with methods that do not fully consider the actual running conditions of CT, thus having certain limitations. In this paper, a design method of rotary pulse valve is proposed. Based on Hamilton principle and field data, a dynamic model of CT running is established and verified. The influence of pulse force and frequency of pulse valve on the maximum running depth of CT is obtained, providing guidance for the parameter design of moving and static valves. The results show that the maximum depth of CT is positively correlated with pulse force and frequency, but there is an inflection point in the influence of pulse frequency on the maximum depth of CT. When the pulse force is small, the pulse frequency has a great influence on the running depth. With the increase of pulse force, the influence of pulse frequency on the maximum running depth of CT decreases linearly. Increasing the number of static valve openings can increase the pulse frequency of the pulse valve, and has little effect on the pulse force peak. The pulse force peak is negatively correlated with the assembly gap, the radius of the center hole, and the radius of the large hole, and the influence of the assembly gap is the most significant. This design method provides a new idea for the design of rotary pulse valve used in pipe string running.