| TONG Wujun,WANG Yingying,JU Shaodong,LI Xingye,WANG Xing,WANG Baofu,WEI Qi.Erosive Characteristics and Service Life Prediction of Subsea Cage-type Choke Valve[J],54(5):116-127 |
| Erosive Characteristics and Service Life Prediction of Subsea Cage-type Choke Valve |
| Received:April 30, 2024 Revised:September 02, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.05.009 |
| KeyWord:subsea choke valve erosion characteristics fluid-structure coupling numerical simulation FLUENT life prediction |
| Author | Institution |
| TONG Wujun |
College of Safety and Ocean Engineering, China University of Petroleum Beijing, Beijing , China;CNOOC Energy Development Co., Ltd., Engineering Technology Division, Tianjin , China |
| WANG Yingying |
College of Safety and Ocean Engineering, China University of Petroleum Beijing, Beijing , China |
| JU Shaodong |
CNOOC Energy Development Co., Ltd., Engineering Technology Division, Tianjin , China |
| LI Xingye |
College of Safety and Ocean Engineering, China University of Petroleum Beijing, Beijing , China |
| WANG Xing |
CNOOC Energy Development Co., Ltd., Engineering Technology Division, Tianjin , China |
| WANG Baofu |
CNOOC Energy Development Co., Ltd., Engineering Technology Division, Tianjin , China |
| WEI Qi |
College of Safety and Ocean Engineering, China University of Petroleum Beijing, Beijing , China |
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| Abstract: |
| This article aims to study the erosion levels at different positions inside a cage-type subsea choke valve under the influence of various factors, based on the Eulerian-Lagrangian fluid-solid coupling numerical simulation method, so as to identify the most severely eroded areas inside the subsea choke valve and predict its service life based on this analysis. To address the erosion issue caused by fine particles inside the subsea choke valve, this study conducts numerical simulations by Ansys Fluent software. The Standard k-ε turbulent model and Discrete Phase Model within the software are utilized for coupled analysis of the solid-liquid two-phase flow. By controlling variables such as particle velocity, particle mass flow rate, particle diameter, choke valve opening, etc., the study observes the influence of different factors on internal erosion of the cage-type subsea choke valve, to reveal the erosion patterns inside the subsea choke valve. Furthermore, the Oka model within the software is used for erosion damage prediction. The valve core and cage sleeve of the cage-type subsea choke valve analyzed in this study are made of tungsten carbide hard alloy (YG8), with a Vickers hardness of up to 13.7 GPa. Innovative consideration is given to material density, hardness, and other properties of components like the valve core in the analysis, fully integrating them with the Oka erosion model to establish a set of erosion model parameters suitable for the cage-type subsea choke valve used in this study. With the variation of particle velocity within a certain range, increasing from 0.165 m/s to 0.293 m/s, the overall maximum erosion rate of the subsea choke valve is positively correlated with the particle velocity. As the particle velocity increases, the kinetic energy carried by the particles themselves increases, leading to a greater impact on the inner wall of the subsea choke valve. When changing the diameter size of the particles, analysis on the erosion situation of the choke valve with four particle diameters (99, 150, 200, 268 μm) found that as the particle diameter increases, the overall maximum erosion rate of the valve shows a decreasing trend. At constant total volume and mass flow rate of particles, as the particle diameter increases, the number of particles carried by the primary phase fluid decreases, resulting in a lower level of particle impact on the surface, causing the erosion rate to decrease with the increase of particle diameter. When continuously changing the mass flow rate of particles from 1.11 g/s to 1.96 g/s, the maximum erosion rate of the valve continuously increases. With the other parameters unchanged, increasing the mass flow rate of particles leads to a greater number of particles and more impacts on the surface per unit time, resulting in a continuous increase in erosion rate. When changing the opening of the throttling orifice of the subsea choke valve from 10% to 100%, the overall maximum erosion rate of the subsea choke valve continuously decreases. This is because, under constant flow rate conditions, the increase in flow area leads to a decrease in the primary phase flow velocity, similar to the effect of changing particle velocity. By analyzing the above factors affecting the cage-type subsea choke valve, it is found that the main locations of erosion concentrate on the surfaces near the throttling holes of the cage sleeve and the throttling holes of the valve core. Therefore, predicting the service life of the cage-type subsea choke valve based on the erosion rates of the surfaces near the throttling holes of the cage sleeve and the valve core can effectively ensure the safety and reliability of subsea Christmas tree operations. Predicting the service life of the cage-type subsea choke valve under extreme oil and gas conditions is a conservative analytical approach. By controlling the maximum particle velocity, the particle mass flow rate, and setting the throttle orifice opening to 20%, conducting erosion analysis on the cage-type subsea choke valve, the shortest estimated service life of the cage-type subsea choke valve is predicted to be 17 years. Within these 17 years, the subsea choke valve will not experience wall penetration due to erosion, thereby avoiding functional damage. |
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