A New High-Efficiency Experimental Design for Optimizing Various Flow Velocities Testing in Extremely Aggressive Formation Water

doi:10.1007/s40195-019-00919-x

Abstract

Abstract:

Compared to the traditional one-by-one method, a new high-efficiency method is used to characterize large numbers of regulations varying samples. Accordingly, bump-shaped electrodes are designed using the computational fluid dynamics model, and the effect of the height and placement of these electrodes is discussed. The experimental feasibility is certified by weight loss measurement. Results indicate that flow velocities of different bump-shaped electrode surfaces are significant differences. Thus, each surface can be analyzed independently; the thickness loss of each electrode surface is consistent with that using one-by-one method, which can effectively improve the experimental efficiency 12 times.

Key words: Bump-shaped electrodes, High efficiency, Computational fluid dynamics (CFD), Weight loss

Yang Zhao, Shu-Yun Cao, Tao Zhang, Jun-Feng Xie, Da-Ke Xu, Fu-Hui Wang. A New High-Efficiency Experimental Design for Optimizing Various Flow Velocities Testing in Extremely Aggressive Formation Water[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(8): 944-950.

Figures/Tables 7

Fig. 1 Schematic of the bump-shaped electrode

Fig. 2 Velocity distribution of the bump-shaped electrodes with various heights: a 1 mm, b 2 mm, c 3 mm

Table 1 Average flow velocity for each surface of the bump-shaped electrode

Height (mm)	No. 1 (m/s)	No. 2 (m/s)	No. 3 (m/s)	No. 4 (m/s)	No. 5 (m/s)	No. 6 (m/s)
1	1.389	2.558	1.414	3.095	1.856	3.068
2	1.404	2.865	1.454	3.105	2.165	3.054
3	1.375	2.751	1.662	3.521	2.054	3.012

Fig. 3 Top views of the velocity distribution of the bump-shaped electrodes arranged symmetrically and variedly at the single rotate cage layer: a eight bump-shaped electrodes, b four bump-shaped electrodes and four flat electrodes

Fig. 4 Side views of the velocity distributions of the bump-shaped electrodes arranged symmetrically and variedly at the double-layer rotate cage: a eight bump-shaped electrodes, b four bump-shaped electrodes and four flat electrodes

Fig. 5 Macroscopic morphologies of the bump-shaped HP-13Cr SS electrodes after removal of the corrosion scales in the extremely aggressive oilfield formation water: a global drawing, b partial enlarged drawing

Fig. 6 Corrosion rates of the HP-13Cr SS electrodes at different velocities measured by the high-efficiency and traditional one-by-one methods

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