Three-Dimensional Simulation of Erosion Life of Metal Mesh Screen Pipe Based on Fluent-DPM Method
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摘要:
金属网布筛管在砂砾冲蚀作用下破坏严重，筛网冲蚀寿命难以预测。为此，建立了考虑金属网布筛管外层保护罩和内层筛网混合结构的三维仿真数值模拟模型，利用流体动力学离散颗粒流（DPM）方法，模拟了生产过程中砂砾冲蚀金属网布的过程，分析了流速对金属网布筛管冲蚀速率的影响。研究发现，冲蚀破坏的临界流速为1.00 m/s，入口流速小于1.00 m/s时，数值模拟预测的冲蚀速率与试验的冲蚀速率相当；入口流速大于1.00 m/s时，受筛管整体结构的影响，数值模拟预测的冲蚀速率比试验值大2.1倍。金属网布筛管外层保护罩是影响筛网过流流速的主要因素；受保护罩过流面积突然减小的影响，流体经过第一层筛网和第二层筛网的流速远大于外层保护罩入口的流速，导致金属网布产生冲蚀破坏。利用该方法预测了8口生产井筛管的寿命，与实际监测寿命相比，相对误差在10.5%以内，满足实际工程应用要求。研究结果表明，基于三维Fluent-DPM方法预测的金属网布筛管冲蚀寿命与实际情况基本一致，为预测金属网布筛管冲蚀寿命提供了新方法。
Abstract:Metal mesh screen pipe is severely damaged under the erosion of sand and gravel particles, and the erosion life of the screen is difficult to predict. To this end, a three-dimensional numerical simulation model considering the mixed structure of the outer protective cover and the inner screen of the metal mesh screen pipe was established. The hydrodynamic discrete particle flow (DPM) method was used to simulate the process of the erosion of the metal mesh by the sand and gravel particles during production, and the influence of flow velocity on the erosion rate of the metal mesh screen pipe was analyzed. The results show when the critical flow velocity for erosion damage is 1.00 m/s. When the inlet flow velocity is less than 1.00 m/s, the simulated erosion rate is comparable to the test erosion rate. When the inlet flow velocity is greater than 1.00 m/s, the simulated erosion rate is 2.1 times higher than the test one due to the influence of the overall structure of the screen pipe. The structure of the outer protective cover of the metal mesh screen pipe is the main factor affecting the overflow flow velocity through the screen. Affected by the sudden reduction of the overflow area of the protective cover, the flow velocity of the fluid passing through the first and second screen layers is much greater than the inlet velocity of the outer protective cover, resulting in erosion damage of the metal mesh. The method is used to predict the screen pipe life of eight production wells in the field, and relative error is within 10.5% compared with the actual monitoring life, which meets the requirements of practical engineering application. The study shows that the predicted erosion life of metal mesh screen pipe based on the 3D Fluent-DPM method is basically consistent with the actual situation, which provides a new method for predicting the erosion life of metal mesh screen pipe.
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Keywords:
- sand production /
- erosion /
- screen pipe /
- erosion rate /
- erosion model
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图 1 三维金属网布筛管冲蚀有限元模型
Figure 1. 3D finite element erosion model of metal mesh screen pipe
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图 2 流速1.50 m/s流体通过筛管各结构的流速
Figure 2. Flow velocity of fluid passing through of different structures of screen pipe at a flow velocity of 1.50 m/s
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图 3 不同入口流速下金属网布筛管各结构的流速分布
Figure 3. Flow velocity distribution of different structures of metal mesh screen pipe at various inlet flow velocities
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图 4 流速1.50 m/s下筛管各结构的冲蚀速率分布
Figure 4. Erosion rate distribution of different structures of screen pipe at a flow velocity of 1.50 m/s
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图 5 不同入口流速下筛管各结构的冲蚀速率
Figure 5. Erosion rate of different structures of screen pipe at different inlet flow velocities
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图 7 出砂油井筛管预测寿命和实际寿命
Figure 7. Predicted and actual life of screen pipe in sand-production oil wells
表 1 不同流速下金属网布的冲蚀速率
Table 1 Erosion rate of metal mesh at different flow rates
流速/
（m·s−1）试验冲蚀速率/
（mg·m−2·h−1）数值模拟冲蚀速率/
（mg·m−2·h−1）0.50 0.006 5 0.006 4 1.00 0.018 0 0.018 5 1.50 0.029 6 0.045 9 2.00 0.050 3 0.087 5 
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表 2 出砂井的生产参数
Table 2 Production parameters of sand-production wells
井号 井眼直径/
mm每米采油量/
（m3·d−1·m−1）平均流速/
（m·s−1）J10H 152.4 2.24 0.71 I02H 152.4 1.10 0.35 J23H 152.4 4.95 1.57 H01H1 152.4 1.89 0.60 H20H 177.8 5.70 1.33 I22H 177.8 2.49 0.58 J34H 177.8 4.12 0.96 J08H 177.8 2.92 0.68
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