| ZHU Li-yun,WANG Sen,WANG Guo-tao,SHI Jia-rui,WANG Zhen-bo,LIU Cen-fan.Numerical Simulation of Influence Factors on Erosion Characteristics of Four-way Pipe in Heavy Oil Thermal Recovery[J],51(11):244-252, 270 |
| Numerical Simulation of Influence Factors on Erosion Characteristics of Four-way Pipe in Heavy Oil Thermal Recovery |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.022 |
| KeyWord:heavy oil thermal recovery four-way pipe erosion wear gas solid two-phase flow numerical simulation |
| Author | Institution |
| ZHU Li-yun |
China University of Petroleum East China, Shandong Qingdao , China |
| WANG Sen |
China University of Petroleum East China, Shandong Qingdao , China |
| WANG Guo-tao |
Qingdao Port Group Co.Ltd., Shandong Qingdao , China |
| SHI Jia-rui |
China University of Petroleum East China, Shandong Qingdao , China |
| WANG Zhen-bo |
China University of Petroleum East China, Shandong Qingdao , China |
| LIU Cen-fan |
Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation, China Special Equipment Inspection and Research Institute CSEI, Beijing , China |
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| Abstract: |
| The gas-solid two-phase flow erosion of the four-way pipe in the process of heavy oil thermal recovery was studied, the erosion variation law was analyzed based on different influencing factors, and the prediction model of the maximum erosion rate of the four-way pipe was built. Based on the gas-solid two-phase flow theory, a numerical model of CFD- DPM-EPM was established to research the influence of different flow velocity, mass flow rate, and particle size on the four-way pipe’s erosion. The location and magnitude of maximum erosion rate of four-way pipe are predicted. There are erosion defects in the shoulder position of the four-way pipe, namely the intersection of vertical pipe and horizontal pipe, and the top of the closed end of the vertical pipe. The simulation results are consistent with the actual failure of the four-way pipe. Flow field structures and particles trajectories were analyzed to verify the erosion distribution on the four-way pipe. Due to the change of the pipeline structure at the intersection, the flow direction of gas-solid phase changes significantly, and the particles impact the shoulder position of the four-way pipe with high velocity under the action of centrifugal force, eventually forming a serious erosion area of the shoulder. The maximum erosion rate of the four-way pipe increases exponentially with the increase of inlet velocity. Furthermore, a continuous erosion zone was observed at the top of the outlet pipe when the velocity was higher. With the increase of velocity, the carrying effect of fluid on particles is enhanced, resulting in the increase of the kinetic energy of particles. The collision on the inner wall of the four-way pipe and the cutting force become larger. Meanwhile, the increase of velocity will lead to a large radial velocity gradient in the outlet pipe, and the greater the velocity, the more significant the radial gradient, the greater the collision of fluid and particles on the top of the outlet pipe, resulting in the erosion of the top of the outlet pipe. The maximum erosion rate increases linearly with the increase of particle mass flow rate. When the velocity remains constant, the number of particles increases with the increase of particle mass flow rate. And then the number of particle collision per unit time of four-way pipe wall increases, and finally leads to the increase of erosion rate. With the increase of particle size, the maximum erosion rate decreases first and then increases, and there is a critical particle size with the minimum erosion rate. The study shows that the erosion rate at the shoulder of the outlet section of the four-way pipe is higher than the top of the closed end, and the shoulder is a higher risk area of erosion wear. Hence, it is necessary to pay attention to the erosion wear degree of the shoulder and carry out timely protection treatment, and reduce the erosion of the shoulder by local thickening or adding turbulence internal components in the actual application. At the same time, the velocity should be appropriately reduced and the entrainment of particles should be minimized to increase the service life of the four-way pipe. A mathematical model for predicting erosion rate of the four-way pipe was established. The parameters of velocity, particle mass flow rate and particle size were considered in this model. The fitted value of the mathematical model of four-way pipe was compared with the simulated value. The results show that the fitting value is in good agreement with the simulated value. The prediction model of erosion rate can be used to predict erosion degree of the four-way pipe and adjust operation parameters in the process of steam injection in heavy oil thermal recovery. |
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