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套管旋流扶正器是一种既能使套管居中,又能改变环空水泥浆流动特征形成螺旋流场,从而达到紊流顶替顶,提高固井质量的机械装置。以ANSYS数值模拟为基础,研究套管旋流扶正器结构参数、流体性能参数对旋流长度的影响。对套管旋流扶正器流速场的研究表明,在肋片截面面积相同的情况下,肋片宽度随着径向增大而增大时,其旋流衰减曲线较好;随着肋片截面面积的减小,肋片有效高度的增加,肋片长度和肋片升角在一定范围内增加,旋流长度均增加;以雷诺数为基础,得出了流体性能参数与旋流衰减的关系。在此基础之上建立包含了套管旋流扶正器结构参数与流体性能参数的套管旋流扶正器的旋流长度公式。
The casing cyclone centralizer is a kind of mechanical device which can make the casing center and change the flow characteristics of annulus water slurry to form the spiral flow field so as to reach the top of the turbulence and improve the cementing quality. Based on the ANSYS numerical simulation, the influence of the casing parameters of the cyclone centralizer on the swirl length was studied. The research on the velocity field of the casing cyclone centralizer shows that the vortex attenuation curve is better when the width of the fin increases with the increase of the radial area under the condition of the same cross-section area. The area decreases and the effective height of the fins increases. The length of the fins and the angle of rise of the fins increase within a certain range and the swirl length increases. Based on the Reynolds number, the relationship between the fluid performance parameters and the vortex shedding is obtained . On this basis, the formula of the swirl length of the casing cyclone centralizer which contains the structural parameters of the casing cyclone centralizer and the fluid performance parameters is established.