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Corrosion inhibitor for high-carbon-dioxide and high-hydrogen sulfide oilfield and preparation method thereof

A high carbon dioxide and corrosion inhibitor technology, applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of poor corrosion inhibitor effect, difficult to obtain raw materials, high preparation cost, simple formula, wide application range, low cost effect

Inactive Publication Date: 2014-02-05
E TECH ENERGY TECH DEV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing complex corrosion inhibitors have technical problems such as complex formula, difficult to obtain raw materials, high preparation cost, and poor corrosion inhibitor effect

Method used

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  • Corrosion inhibitor for high-carbon-dioxide and high-hydrogen sulfide oilfield and preparation method thereof
  • Corrosion inhibitor for high-carbon-dioxide and high-hydrogen sulfide oilfield and preparation method thereof
  • Corrosion inhibitor for high-carbon-dioxide and high-hydrogen sulfide oilfield and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A compound corrosion inhibitor formula for high carbon dioxide and high hydrogen sulfide oilfields is as follows (mass percentage):

[0035]

[0036] The static test temperature is 80°C, and the corrosion inhibitor is soaked in the corrosion coupon for 7 days. The corrosion inhibition effect is as follows:

[0037] Table 1 Sustained-release efficiency of different dosing concentrations

[0038]

[0039]

Embodiment 2

[0041] A compound corrosion inhibitor formula for high carbon dioxide and high hydrogen sulfide oilfields is as follows (mass percentage):

[0042]

[0043] The static test temperature is 80°C, and the corrosion inhibitor is soaked in the corrosion coupon for 7 days. The corrosion inhibition effect is as follows:

[0044] Table 2 Sustained-release efficiency of different dosing concentrations

[0045]

Embodiment 3

[0047] A compound corrosion inhibitor formula for high carbon dioxide and high hydrogen sulfide oilfields is as follows (mass percentage):

[0048]

[0049] The static test temperature is 80°C, and the corrosion inhibitor is soaked in the corrosion coupon for 7 days. The corrosion inhibition effect is as follows:

[0050] Table 3 Sustained-release efficiency of different dosing concentrations

[0051]

[0052]

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PUM

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Abstract

The invention relates to a corrosion inhibitor for a high-carbon-dioxide and high-hydrogen sulfide oilfield and a preparation method thereof and belongs to the technical field of petroleum wastewater treatment. The corrosion inhibitor for the high-carbon-dioxide and high-hydrogen sulfide oilfield comprises the following components in percentage by mass: 10 to 30% of salifying imidazoline intermediate, 0.1 to 15% of ethidene diamine, 20 to 30% of ammonium hydroxide and 30 to 69% of water. The preparation method comprises the following steps of: (1) preparing a salified imidazoline intermediate, namely, adding palmitic acid and triethylene tetramine to a xylene solvent, heating to 150 to 170 DEG C for reflux; adding benzyl chloride after water is separated out from a water segregator, and heating to 180 to 210 DEG C and holding for 4-10 hours to obtain a non-salified salified imidazoline intermediate, and evaporating out excessive solvent to obtain the salified imidazoline intermediate; and (2) preparing the corrosion inhibitor for the oilfield, namely, completely dissolving the salified imidazoline intermediate and ethidene diamine by using ammonium hydroxide, adding ethyl alcohol completely while agitating, and finally diluting with water. The corrosion inhibitor is simple in a prescription, low in cost, convenient to process, wide in applicable scope, high in slow-release efficiency and good in slow-release effect and the raw materials are easily available.

Description

technical field [0001] The invention belongs to the technical field of petroleum wastewater treatment, in particular to a corrosion inhibitor for high carbon dioxide and high hydrogen sulfide oil fields and a preparation method thereof. Background technique [0002] Corrosion refers to the damage or deterioration of materials caused by the action of the surrounding environmental medium. The loss caused by corrosion to human beings is staggering, and the oil and gas industry is the most serious sector affected by corrosion. Most of China's oil and gas fields are distributed in saline-alkali marshes and oceans, with medium, strong, and even particularly strong corrosion, which is very corrosive to various pipelines, buried, and marine facilities. In the high water-cut period, the water content of the produced fluid is generally above 70% to 90%, and the corrosion of various facilities is very serious, and the corrosion rate is as high as 1.5 to 3mm / a. The oil and gas fields ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/04C09K8/54
Inventor 唐勇万钢
Owner E TECH ENERGY TECH DEV CORP
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