Four-point bending test device for pipe full-size evaluation

Abstract

The invention discloses a four-point bending test device for pipe full-size evaluation, and relates to the technical field of testing device of engineering pipes and supporting components. A device of the prior art cannot meet engineering requirements in the aspects of test precision, load capacity, test safety and the like. For overcoming the shortcomings of the prior art, the technical scheme provided by the invention comprises that the four-point bending test device for pipe full-size evaluation includes an electric lifter, a force measuring sensor, a clamp assembly, a guyed displacement sensor, a magnetic suction block for connecting the displacement sensor and a sample, a lifting bridge, and lifting lugs for connecting the lifting bridge and a full-size evaluation test machine. With a ball head connection form of the clamp assembly, the test is closer to on-service real working conditions of a pipe, the electric lifter is used as a bending load loading mechanism, the supporting load is large, safe and stable, and loaded data are accurate; the displacement sensor replaces a strain gage acquisition system, so the efficiency is improved, and the financial resources are saved; and the four-point bending test device can meet the needs of engineering technology.

Description

[0001] Technical field: [0002] The invention relates to the technical field of testing devices for engineering pipes and their supporting components, in particular to a four-point bending test device for full-scale evaluation of oil casings. [0003] Background technique: [0004] In well conditions such as directional wells, highly deviated wells, horizontal wells, and heavy oil thermal recovery wells, the tubing and casing may be bent due to the three-dimensional stress state. In order to reduce the oil and gas well scrapping accidents caused by the bending failure of the oil casing downhole, the physical evaluation test with bending will be carried out on the pipe before going into the well. The currently used bending test is described in the relevant standards. Many testing structures have designed test devices according to the standard requirements. The equipment imported from abroad in the 1990s can no longer fully meet the test requirements in terms of test accuracy a...

AI Technical Summary

Problems solved by technology

However, there are defects in this scheme: when the steel pipe is bent and deformed, the bearing load is small, the safety factor is low, and the loading data is inaccurate

However, there are defects in this scheme: 1. Using oil cylinder to load, the test process is unstable, and the actual value of bending will change with the change of axial force, internal pressure and other loads; 2. The strain gauge acquisition system has low efficiency and high cost

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