Device and method for evaluating corrosion resistance of inner coating of drill pipe

Abstract

The invention discloses a device and method for evaluating the corrosion resistance of an inner coating of a drill pipe. The device comprises a main heater, auxiliary heaters, a multi-stage electric stirrer, sample installation openings and stress loading devices, wherein the stress loading devices comprise the stretching stress loading device, the torsion stress loading device and the bending stress loading device. By applying the device and the method implemented on the basis of the device, the chemical medium corrosion and erosion resistance of the inner coating of the drill pipe under the action of stretching stress or bending stress or torsion stress can be evaluated; by regulating the temperature and the pressure and introducing corrosive gases such as H2S and CO2, the service environments of the inner coating of the drill pipe in different well sections under multiple working conditions can be simulated. Accordingly, the device and method have the important significance on selection and life prediction of the inner coating of the drill pipe on the oil field site.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of corrosion evaluation of oil well pipes, and in particular relates to a device and method for evaluating the corrosion resistance of an inner coating of a drill pipe. [0003] Background technique: [0004] During the production of oil and gas wells, the working environment of the drill pipe (drilling mud and formation) often contains corrosive media (such as O 2 , H 2 S, CO 2 , Cl - and the decomposition products of drilling mud additives, etc.), these corrosive media will seriously corrode the drill pipe. At the same time, during the drilling process, the drill pipe is also subjected to tension, compression, bending, torsion, vibration loads, rotational centrifugal and additional dynamic loads during tripping, etc., and the working conditions are very bad. Under the combined action of the above factors, the corrosion failure of the drill pipe is often caused. [0005] The application of inner...

AI Technical Summary

Problems solved by technology

[0007] The first test device can test the high temperature and high pressure corrosion resistance of the coating; the second device can test the ultimate bending performance of the pipeline coating at normal temperature; the third simulation device can only test the wear resistance of the coating at high temperature and normal temperature performance

The functions of the above devices are relatively simple, and none of them can simulate the chemical medium corrosion resistance and erosion corrosion performance of the inner coating of the drill pipe when the drill pipe is stressed, stretched, twisted, or bent.

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