Journal of Oil and Gas Technology
Vol.41 No.01(2019), Article ID:29549,6 pages
10.12677/JOGT.2019.411009

Study on Pure Mechanical Scouring Behavior of Electric Submersible Pump Suction Material

Zheng Duan, Shasha Feng, Junli Huang, Jie Rong

Shenzhen Branch of CNOOC China Ltd., Shenzhen Guangdong

Received: Apr. 28th, 2018; accepted: Jul. 3rd, 2018; published: Feb. 15th, 2019

ABSTRACT

45# steel and 316L stainless steel were used as the research object to study the influence law of impact time, flow velocity and impact angle on the scouring behavior under the pure mechanical scouring conditions. The results show that pure mechanical scouring weight loss rate is inversely proportional to the hardness of material. The scouring weight loss rate of 316L stainless steel with high hardness is low, and 45# steel with low hardness is high. The scouring weight loss rate of 45# steel and 316L stainless steel increases first with the increase of impact time initially, and then at the stable wear stage. The scouring weight loss rate shows a linear increase trend with the velocity increase. At 45˚ impact angle, the scouring weight loss rate is the smallest, and it increases when the impact angle is higher or lower than 45˚. The damage mechanism is cutting at 0˚, and when the damage mechanism is plowing at 90˚. The study provides a theoretical basis for the selection of offshore oil field electric submersible pump unit and guarantee of its high life operation.

Keywords:ESP Suction Material, Pure Mechanical Scouring Behavior, Impact Time, Flow Velocity, Impact Angle

1. 引言

2. 试验部分

2.1. 试验材料

Table 1. The chemical components of 45# steel and 316L stainless steel

2.2. 试验方法

3. 试验结果与讨论

3.1. 机械冲刷失重速率与材料硬度的关系

Figure 1. The scouring weight loss rate of 45# steel and 316L stainless steel

3.2. 机械冲刷失重速率与冲刷时间的关系

Figure 2. The trend of weight loss rate of mechanical scouring with the change of scouring time

3.3. 机械冲刷失重速率与冲刷速度的关系

$W=k{v}^{n}$ (1)

Figure 3. The trend of weight loss rate of mechanical scouring with the change of scouring velocity

3.4. 机械冲刷失重速率与冲击角度的关系

Figure 4. The trend of weight loss rate of mechanical scouring with the change of scouring angle

45#钢在不同冲击角度冲刷后的宏观形貌见图5。可以看出，当冲击角度为90˚时，45#钢表面可以观察到明显的冲击坑，而当冲击角度为0˚时则未观察到明显的冲击坑。这是由于冲击角度较小时，水平分量作用较强，主要的损伤机制为切削，随着冲击角度的增大，垂直分量作用增强，粒子撞击材料表面，把金属从坑中挤出，形成带唇边的压坑，其损伤机制为犁削。

Figure 5. The macro-morphology of 45# steel at 0˚ and 90˚ impact angles

4. 结论

1) 对于韧性材料，纯机械冲刷失重速率与材料的硬度成反比。316L不锈钢的硬度高，冲刷失重速率小；45#钢的硬度低，冲刷失重速率大。

2) 45#钢和316L不锈钢的冲刷失重速率随着冲击时间的增加，先增加后处于稳定磨损阶段。

3) 45#钢和316L不锈钢的冲刷失重速率随着流速的增加呈线性增加趋势。

4) 45#钢和316L不锈钢在冲击角度为45˚时，冲刷失重速率最小；高于或低于45˚时冲刷失重速率均增加；当冲击角度为0˚时的损伤机制为切削，当冲击角度为90˚时的损伤机制为犁削。

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[编辑] 鲁大丽