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Corrosion inhibitor resistant to H2S and CO2

A combined effect and corrosion inhibitor technology, applied in the direction of wellbore/well components, earthwork drilling and production, etc., can solve the problems of large fluctuations in chemical concentration, insignificant corrosion, and insufficient dosage, so as to reduce production costs and workers The effect of labor intensity, effectiveness or adaptability, and low emulsifying activity

Inactive Publication Date: 2010-02-24
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic amines for the inhibition of H 2 The corrosion of S and the prevention of hydrogen embrittlement caused by sulfide are more effective, and the same as Cl in acidic medium - There is a synergistic effect of corrosion inhibition, but it is easy to desorb at high temperature; use better anti-CO 2 Corrosion inhibitors are imidazoline derivatives or products compounded with thiazole derivatives. The mechanism of action is adsorption or film formation on the metal surface. It not only inhibits CO 2 Corrosion also has a certain scale inhibition effect, but it is not effective for inhibiting H 2 The corrosion effect of S is not obvious; in short, the existing corrosion inhibitors may 2 Corrosion effect (ZL00109687.7), or for H 2 S corrosion works (ZL200410021473.6), while H 2 S and CO 2 The combined effect of the corrosive environment has little effect and cannot fundamentally solve the CO 2 High partial pressure and associated with a large amount of H 2 Corrosion in the environment of low pH value, high salinity and high chloride ion coexistence of S gas
[0006] The traditional intermittent dosing method needs to be administered multiple times, which is not only inconvenient to use, but also the concentration of the drug in the oil well fluctuates greatly, resulting in the "peak-valley" phenomenon
When the concentration of the agent is at a low point, it is not only difficult to play its role, but also may cause serious anode corrosion due to insufficient dosage
After dosing, the concentration of the agent rises to the peak, which may cause corrosion of the concentration difference battery

Method used

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  • Corrosion inhibitor resistant to H2S and CO2
  • Corrosion inhibitor resistant to H2S and CO2
  • Corrosion inhibitor resistant to H2S and CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: The corrosion inhibitor is made up of the following components by weight percentage: imidazoline quaternary ammonium compound 50%, alkynyloxymethyl quaternary ammonium salt 10%, isooctyl alcohol polyoxyethylene ether phosphate 10%, isopropanol 28.5%, fatty alcohol polyoxyethylene ether 0.5%, alkyl alcohol polyoxyethylene ether 1.0%.

[0050] The preparation method of the corrosion inhibitor is: according to the molar ratio of the above-mentioned naphthenic acid and diethylenetriamine naphthenic acid to prepare the imidazoline quaternary ammonium compound, the naphthenic acid and diethylenetriamine are sequentially added to the belt with stirring and distillation In the reactor of the device, react at 150±2°C for 3 hours, rapidly raise the temperature to 220°C, and vacuumize and dehydrate for 2 hours. Incubate at 5°C for 3 to 4 hours to obtain the intermediate of imidazoline quaternary ammonium compound; cool the above product to 100°C±2°C, take 50% of the ...

Embodiment 2

[0052] Embodiment 2: corrosion inhibitor is made up of the following components by weight percentage: imidazoline quaternary ammonium compound 80%, alkynyloxymethyl quaternary ammonium salt 5%, isooctyl alcohol polyoxyethylene ether phosphate 4.8%, isopropanol 10%, fatty alcohol polyoxyethylene ether 0.1%, alkyl alcohol polyoxyethylene ether 0.1%.

[0053] The preparation method of the corrosion inhibitor is basically the same as that of Example 1 except that the dosage is different.

Embodiment 3

[0054] Embodiment 3: The corrosion inhibitor is made up of the following components by weight percentage: imidazoline quaternary ammonium compound 60%, alkynyloxymethyl quaternary ammonium salt 8%, isooctyl alcohol polyoxyethylene ether phosphate 1%, isopropanol 30%, fatty alcohol polyoxyethylene ether 0.3%, alkyl alcohol polyoxyethylene ether 0.7%.

[0055] The preparation method of the corrosion inhibitor is basically the same as that of Example 1 except that the dosage is different.

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Abstract

The invention relates the chemical engineering field, especially a H2 and CO2 inhibiter. H2 and CO2 are produced accompany to oil-gas field exploitation and transfusion process, and can corrode exploitation equipment. The inhibiter contains at least (by wt. %): isopropyl alcohol 10-30, fatty alcohol polyoxyethylene ether .1-0.5, and litol polyoxyethylene ether 0.1- 1.0. The inhibiter can be used in oil / water well with high temperature and pressure, and has the advantages of good corrosion resistance, low consumption, low cost and high efficiency.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for suppressing H 2 S and CO 2 An anti-H for mining equipment corrosion 2 S and CO 2 Corrosion inhibitors under combined action. Background technique [0002] The huge corrosion problem accompanying oil exploitation has attracted increasing attention. Oil and water well pipe strings, pumps, valves, and surface pipe networks are all affected by corrosive media and the surrounding environment. The removal of corrosive Cl in oil wells - , SO 4 2- , S 2- , OH - and scaling Ca 2+ , Mg 2+ 、Ba 2+ 、H + In addition, it is often accompanied by a large amount of H 2 S gas and high partial pressure of CO 2 Gas, most of my country's onshore oilfields have entered the middle and late stages of exploitation, and the corrosion environment has deteriorated sharply. 2 S content rises, CO 2 Partial pressure increases year by year. [0003] h 2 S is not only highly corrosiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/04C09K8/54
Inventor 贺华镭
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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