Device and method for evaluating inhibitor film integrity under scouring work conditions

Abstract

The invention discloses a device and method for evaluating inhibitor film integrity under scouring work conditions and belongs to the technical field of petrochemical engineering corrosion and protection. The device comprises a supplied flow circulating unit, a shear force measuring unit, an electrochemical monitoring unit, a camera shooting observation unit, a test piece testing unit and an inhibitor injection unit. By means of the device and method, evaluation of integrity of an inhibitor film can be achieved. Firstly, flow shear force is measured through the shear force measuring unit under different scouring work conditions, the corrosion rate is measured through the test piece testing unit, online corrosion monitoring is conducted through the electrochemical monitoring unit, the surface appearance of a test piece is observed and recorded through the camera shooting observation unit, integrity of the inhibitor film is comprehensively evaluated through data comparison and analysis, critical parameters are obtained when integrity of the inhibitor film is damaged, finally an inhibitor is injected through the inhibitor injection unit so that the inhibitor film can be repaired to be complete, and therefore monitoring and evaluation of stability, damage and repair of the inhibitor film are achieved.

Description

technical field [0001] The invention belongs to the technical field of petrochemical corrosion and protection, and in particular relates to a device and a method for evaluating the integrity of a corrosion inhibition film under different scouring conditions. Background technique [0002] In the process of oil and gas production, the inner wall of the pipeline is usually coated with a corrosion inhibitor, and the corrosion inhibitor is continuously injected to prevent internal corrosion of the oil pipeline. Usually, the corrosion inhibitor must be attached to the surface of the material to form a complete protective film in order to play a good protective role. When the corrosive medium flows in the pipeline, it will have a fluid scouring effect on the wall surface, and the shear force on the wall surface may destroy the integrity of the corrosion inhibitor film, resulting in the loss of the protective effect of the corrosion inhibitor. The protective effect of corrosion inh...

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Problems solved by technology

[0004] (1) Stirring is mainly used to simulate the flow velocity in the pipe, which is difficult to truly reflect the complex flow distribution and scouring conditions in the oil pipe

[0005] (2) The corrosion evaluation device lacks a fluid wall shear force measurement device, and cannot quantitatively investigate the erosion and damage effect of the fluid shear force on the corrosion inhibitor film

[0006] (3) Lack of online corrosion monitoring means, it is difficult to observe the corrosion process on the surface of the test piece online, and monitor the occurrence and development of corrosion online

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