膨胀波纹管抗外挤强度的影响因素分析

为了找出影响膨胀波纹管抗外挤强度的影响因素，通过ABAQUS有限元软件对波纹管的抗外挤强度进行模拟，研究了波纹管的不圆度、波纹管的壁厚、井筒直径等对波纹管抗外挤强度的影响。结果表明，不圆度和壁厚对膨胀后波纹管抗外挤强度的影响较大，随着波纹管不圆度的减小，波纹管的抗外挤强度迅速的增大，壁厚越大波纹管的抗外挤强度也越大；另外，增大波纹管应用的井筒直径可以有效的提高波纹管的膨胀性能，降低波纹管膨胀后的不圆度，但是大尺寸的井筒直径降低了波纹管膨胀后的抗外挤强度。

Influence Factors Analysis of Expansion Bellows Collapse Resistance Strength

In order to find out the influence factors of expansion bellows collapse resistance strength, the ABAQUS finite element software was used to simulate the expansion bellows collapse resistance strength; the effects of the non-roundness, wall thickness of the bellows and the diameter of the wellbore on the collapse strength of the bellows were studied. The results showed that the non-roundness and the wall thickness have a great influence on the collapse strength of expansion bellows. With the decrease of the non-roundness of the bellows, the collapse strength of the bellows increases rapidly. The greater the wall thickness of the bellows the greater the collapse strength; In addition, increasing the borehole diameter for bellows applications can effectively improve the expansion performance of bellows and reduce the non-roundness of the bellows after expansion, but the large diameter wellbore reduces the collapse strength of the bellows after expansion.