Sleeve bending load similarity experiment method and bending moment loading device

Abstract

The invention relates to the field of oil and gas exploitation, and discloses a sleeve bending load similarity experiment method and a bending moment loading device. The method specifically comprises the following steps: determining parameters of an experimental pipe according to a selected geometric similarity ratio, and manufacturing the experimental pipe; determining the axial load of the experimental pipe according to the dynamic similarity ratio and the axial load of the sleeve; fixing the two ends of the experimental pipe, and loading an axial load on the end part of the experimental pipe; gradually loading radial pressure on a loading point in the middle of the experimental pipe by using a bending moment loading device to obtain a relational graph of the radial pressure and the radial displacement of the loading point; and determining the critical radial displacement when the experimental pipe is bent and yielded according to the slope turning point in the relational graph, and calculating the critical radial displacement when the casing is bent and yielded according to the similarity principle and the critical radial displacement of the experimental pipe. The method is used for solving the problem of how to obtain the critical radial displacement when the casing pipe is bent and yielded, and the effects of perfecting the casing pipe parameter selection process and reducing the bending damage condition of the casing pipe are achieved.

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