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An experimental method and device for dynamically simulating under-deposit corrosion

A technology of under-deposit corrosion and experimental equipment, which is applied in the direction of measuring equipment, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve the problems that the dynamic simulation of galvanic effect cannot be realized, and achieve reliable experimental methods, simple structure and reasonable steps Effect

Active Publication Date: 2016-08-24
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

At present, there is no such experimental method and device that can perform dynamic high temperature and high pressure simulation. A sub-deposit corrosion experiment bracket and its experimental method (application number: ZL201210144586.X) mainly focus on electrochemical corrosion under sub-deposit corrosion conditions. The test cannot realize the galvanic couple effect caused by the different scale thickness and the dynamic simulation under high temperature and high pressure

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  • An experimental method and device for dynamically simulating under-deposit corrosion
  • An experimental method and device for dynamically simulating under-deposit corrosion
  • An experimental method and device for dynamically simulating under-deposit corrosion

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with specific embodiments.

[0015] Aiming at the environmental parameters of a submarine oil pipeline, two sets of experiments are designed, one static and one dynamic. The test piece used in the dynamic experiment is a sand deposit sample obtained through a special scale test to ensure that the deposited sand can still be maintained under the condition of a simulated flow rate of 0.5m / s. There are four test pieces in each group of experiments, one of which has no sand on the surface, and one surface is completely covered by sand; the bottom of the other two test pieces is connected by copper wires to simulate the galvanic couple effect. All covered with sand. The experimental temperature was 80°C, CO 2 The partial pressure is 0.8MPa, and the experimental solution is the simulated solution of the oilfield produced water.

[0016] The experimental device adopts an experimental device for d...

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Abstract

The invention belongs to the technical field of material corrosion and protection experiments and relates to an experiment method for dynamically simulating under-deposit corrosion and an experiment device of the experiment method. The experiment method provided by the invention can simulate couple effects between two test pieces, can realize corrosion weight loss measurement and surface morphological observation, and is suitable for an under-deposit corrosion dynamic simulation experiment research. The experiment device comprises a main body annular clamp and a sector-shaped auxiliary test piece, wherein the central position of the main body annular clamp has a circular hollow hole and a corresponding notch; the main body annular clamp is fixedly connected with an externally-connected driving shaft by the notch; a groove is formed in the bottom of the main body annular clamp; an electric lead wire is arranged in the groove to be connected with the two experiment test pieces; physical isolation between each two experiment test pieces is realized by the sector-shaped auxiliary test piece; the thickness of the auxiliary test piece can be adjusted so that the thickness difference between the auxiliary test piece and the experiment test piece is equal to the scale layer thickness required by the experiment. The experiment method has the advantages of reliability, high credibility, simple device structure, and convenience and practicability.

Description

technical field [0001] The invention belongs to the technical field of material corrosion and protection experiments, and relates to an experimental method and a device for dynamically simulating under-deposit corrosion. It is mainly suitable for evaluating the corrosion status of metal pipes under different sand and scale deposition conditions, especially for the simulation of the galvanic effect caused by uneven sand and scale on the surface of metal materials, and the evaluation of the effect of corrosion inhibitors after adding corrosion inhibitors. Background technique [0002] Metal materials often have chemical and electrochemical interactions with the surrounding environment during service, causing corrosion risks. The special environment of oil and gas pipelines will produce CO 2 、H 2 Corrosive gases such as S, accompanied by microbial sand and scale deposition, form under-deposit corrosion in a complex medium environment, resulting in leakage and failure of oil an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00G01N17/02
Inventor 张雷刘英坤崔伟唐德志黄金营路民旭许立宁
Owner UNIV OF SCI & TECH BEIJING
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