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Method for evaluating corrosion inhibition performance of vapor-phase corrosion inhibitor

A gas-phase corrosion inhibitor and evaluation method technology, which can be used in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., and can solve problems such as on-site corrosion and perforation

Pending Publication Date: 2020-05-29
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing relevant evaluation standards are limited to the evaluation of corrosion in the gas phase environment, ignoring the corrosion effect on the sea pipe caused by the liquid droplets or effusion formed after the condensation of water vapor, so that the laboratory evaluation is qualified, but the on-site corrosion is serious or even perforated.

Method used

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  • Method for evaluating corrosion inhibition performance of vapor-phase corrosion inhibitor
  • Method for evaluating corrosion inhibition performance of vapor-phase corrosion inhibitor
  • Method for evaluating corrosion inhibition performance of vapor-phase corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take the on-site water as the corrosion medium, and the filling concentration of the gas-phase corrosion inhibitor in the on-site water is 0ppm. Take six metal test pieces with the same material as the sea pipe, wash them with alcohol and acetone to remove oil, dry them and weigh them to get the test piece samples. Fasten the test piece samples on the fixture in two layers, place the fixture with the test piece sample in the dynamic evaluation reaction kettle, introduce the on-site water without adding gas phase corrosion inhibitor into the dynamic reaction kettle, and make the three test pieces The sample is suspended above the liquid level of the on-site water, and the other three test piece samples are immersed in the on-site water, the speed of the fixture is 0.5m / s, the dynamic reactor is purged with nitrogen to discharge the air, and the dynamic evaluation reactor is fed with CO 2 and H 2 The nitrogen pressure of S was increased to 8MPa, and the temperature was ra...

Embodiment 2

[0052] The on-site water is used as the corrosion medium, and the gas-phase corrosion inhibitor in the on-site water is CTQH-1001 gas-phase corrosion inhibitor produced by CNOOC Changzhou Coating Chemical Research Institute Co., Ltd., whose main component is morpholine quaternary ammonium salt. The filling concentration is 200ppm, and six pieces are taken The metal test piece of the same material as the sea pipe is washed with alcohol and acetone to remove oil, dried and weighed to obtain the test piece sample, and the test piece sample is fastened on the fixture in two layers, and the fixture containing the test piece sample is placed on the In the dynamic evaluation reactor, the on-site water added with the gas phase corrosion inhibitor is introduced into the dynamic reactor, so that three test piece samples are suspended above the liquid level of the on-site water, and the other three test piece samples are immersed in the on-site water. The rotation speed is 0.5m / s, the dyn...

Embodiment 3

[0058] Take simulated water as the corrosion medium, and the filling concentration of the vapor phase corrosion inhibitor in the simulated water is 0ppm. Take six metal test pieces with the same material as the sea pipe, wash them with alcohol and acetone to remove oil, dry them and weigh them to get the test piece samples. Fasten the test piece sample on the fixture in two layers, place the fixture with the test piece sample in the dynamic evaluation reaction kettle, introduce the simulated water without adding gas phase corrosion inhibitor into the dynamic reaction kettle, and make the three test pieces The sample is suspended above the liquid surface of the simulated water, and the other three test piece samples are immersed in the simulated water, the speed of the fixture is 0.5m / s, the dynamic reactor is purged with nitrogen to discharge the air, and the dynamic evaluation reactor is fed with CO 2 and H 2 The nitrogen pressure of S was increased to 8MPa, and the temperatu...

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Abstract

The invention relates to the technical field of anti-corrosion engineering and particularly discloses a method for evaluating corrosion inhibition performance of a vapor-phase corrosion inhibitor. Themethod for evaluating the corrosion inhibition performance of the vapor phase corrosion inhibitor comprises steps of (1) collecting corrosion working condition parameters of a to-be-applied field ofthe vapor phase corrosion inhibitor; (2) determining the water quality of a vapor phase corrosion inhibitor evaluation experiment; (3) determining parameters of the evaluation experiment according tofield working conditions; (4) selecting a dynamic evaluation reaction kettle according to the designed experiment parameters; and (5) carrying out multiple groups of vapor phase corrosion inhibitor evaluation experiments. The evaluation method for the corrosion inhibition performance of the gas-phase corrosion inhibitor is advantaged in that a situation that a subsea pipeline in the gas phase andthe liquid phase is corroded under various actual corrosion working conditions of pipeline transportation of natural gas is simulated, and thereby whether the selected corrosion inhibitor meets the field use requirement or not is scientifically judged.

Description

technical field [0001] The invention relates to the technical field of anticorrosion engineering, in particular to a method for evaluating the corrosion inhibition performance of a vapor phase corrosion inhibitor. Background technique [0002] During the exploitation and transportation of associated gas and natural gas in offshore gas fields and oil fields, some water vapor is contained in the gas due to incomplete dehydration, and the existence of corrosive gas will cause certain corrosion to the sea pipe. Especially the liquid accumulation position formed after the water vapor condenses, the corrosion is particularly serious. Existing relevant evaluation standards are limited to gas-phase environmental corrosion evaluation, ignoring the corrosion effect on sea pipes caused by droplets or effusions formed after condensation of water vapor, resulting in cases where the laboratory evaluation is qualified, but the on-site corrosion is severe or even perforated. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 徐慧秦俊岭赵起锋景佳春陈武王伟杰刘博狄志刚廖伍彬
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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