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Compounded carbon dioxide corrosion inhibitor

A technology of carbon dioxide and corrosion inhibitor, which is applied in wellbore/well parts, earthwork drilling and production, etc., can solve the problems of oil field production economic loss, environmental pollution, high perforation rate, etc., to reduce consumption, prevent corrosion, and improve corrosion inhibition Effect

Active Publication Date: 2014-05-28
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, mesa-like pitting is the most serious situation in the corrosion process, and the perforation rate of this corrosion is very high. Usually the corrosion rate can reach 3mm / a-7mm / a, so that the service life of the oil and gas well string is reduced to 6 ~18 months, causing huge economic losses to oil field production, and also causing certain environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Compound the corrosion inhibitor with other substances according to the formula in Table 1. The listed percentages are all mass percentages, and the balance is distilled water. Among them, the corrosion inhibitor A can be obtained by using oleic acid and diethylenetriamine as raw materials, through intermolecular amidation and intramolecular cyclodehydration. Concrete reaction equation is as follows:

[0016] Wang Xia, Shangguan Changhuai, Hu Zhiqiang. Evaluation of corrosion inhibition performance of 2-aminoethyl heptadecenyl imidazoline[J]. Fine Petrochemical Industry, 2010,27(1):39.

[0017]

[0018] R is for C 17 h 33 ; Corrosion inhibitor A and benzyl chloride are quaternized to obtain corrosion inhibitor B. Concrete reaction equation is as follows:

[0019]

[0020] Table 1 Combination of compound corrosion inhibitors

[0021]

Embodiment 2

[0023] Corrosion test: The material used in the test is Q235 steel, and its chemical composition (%, w) is C0.17, Si0.20, Mn0.45, P0.01, S0.03, and Fe balance. The size of the test piece is 50mm×10mm×3mm. Use analytical reagent and distilled water to prepare 12 parts of NaCl solution with a mass fraction of 3.5%. The first part is a blank solution without adding any corrosion inhibitor; the second to fifth parts are respectively added with 50mg / L corrosion inhibitors A~D; Add 50mg / L composite corrosion inhibitor a~g to 7 parts respectively.

[0024] Scrub the test piece with decontamination powder first, rinse it with distilled water, then wash it with acetone and absolute ethanol, dry it with hot air and weigh it, hang the steel piece in the above 12 solutions respectively, and pass through 1h CO 2 The solution was saturated and the experimental temperature was 60 °C. After soaking for 72 hours, take the test piece out, soak it in the post-treatment solution for 3 minutes, ...

Embodiment 3

[0029] Use analytical reagent and distilled water to prepare 12 parts of NaCl solution with a mass fraction of 3.5%. The first part is a blank solution without adding any corrosion inhibitor; the second to fifth parts are respectively added with 50mg / L corrosion inhibitors A~D; Add 50mg / L composite corrosion inhibitor a~g to 7 parts respectively.

[0030] Electrochemical impedance test: The traditional three-electrode system is adopted, the working electrode material is Q235 steel, the auxiliary electrode is a platinum electrode, and the reference electrode is a saturated calomel electrode (SCE). The perturbation potential amplitude of electrochemical impedance spectroscopy is ±5mV, scanning from high frequency to low frequency, and the scanning frequency range is 100kHz-0.01Hz. The electrochemical impedance test parameters are shown in Table 3:

[0031] Table 3: CO Added with Different Corrosion Inhibitors 2 N measured in saturated brine y quist spectrum fitting parameters...

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Abstract

A compounded carbon dioxide corrosion inhibitor belongs to a corrosion inhibitor anticorrosion technology. The invention relates to a corrosion inhibitor anticorrosion technology of carbon steel materials in CO2 environment, and especially relates to an efficient corrosion inhibitor obtained through the compounding and the corrosion inhibition cooperation of organic compounds comprising an imidazoline corrosion inhibitor and its derivative, alicyclic amine and its derivative, rosin amine and the like with thiourea and sodium dodecanesulphonate, so the corrosion of the carbon steel materials in the CO2 system can be effectively inhibited. The efficient corrosion inhibitor can be obtained through the compounding and the corrosion inhibition cooperation of the organic compounds with thiourea and sodium dodecanesulphonate. The compounded corrosion inhibitor is compact on the adsorption layer of the surface of carbon steel, so the corrosion inhibition effect of the corrosion inhibitor on the carbon steel materials in the CO2 corrosion system is improved, and the consumption of the corrosion inhibitor is effectively reduced. The compounded carbon dioxide corrosion inhibitor is of important guidance significance for developing efficient composite corrosion inhibitors. The compounded carbon dioxide corrosion inhibitor can be used for preventing CO2 corrosion in oil and gas fields.

Description

technical field [0001] The present invention relates to a kind of carbon steel material in CO 2 Corrosion inhibitor anti-corrosion technology in the environment, especially involving the use of imidazoline corrosion inhibitors and their derivatives (including hydrophobic carbon chain length C11-17), aliphatic amines and their derivatives (C12-18), rosin amine and other organic The synergistic effect of corrosion inhibition between the compound and thiourea and sodium dodecylsulfonate, through compounding to obtain a high-efficiency corrosion inhibitor, thereby effectively inhibiting CO 2 Corrosion of carbon steel materials in corrosion systems. Background technique [0002] CO 2 Corrosion is the most common form of corrosion encountered in oil and gas production. In the case of using carbon steel and low carbon steel, it may lead to high corrosion rates and severe localized corrosion. and natural gas containing CO 2 , causing corrosion to the downhole tubing string. CO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/02C09K8/54
Inventor 赵景茂张晨曾龙伟魏振禄
Owner BEIJING UNIV OF CHEM TECH
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