Corrosion inhibitor for oil wells and preparation method

A corrosion inhibitor and oil well technology, applied in the field of oil drilling, can solve the problems of increased cost, complex corrosion medium, limited effect of corrosion inhibitor, etc., and achieve the effect of reducing contact and inhibiting corrosion

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex structure of oilfield water, especially CO 2 , so the corrosion medium is extremely complex, the effect of a single corrosion inhibitor is limited, it is difficult to meet the requirements of on-site use, and most of them ar...

Method used

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  • Corrosion inhibitor for oil wells and preparation method
  • Corrosion inhibitor for oil wells and preparation method
  • Corrosion inhibitor for oil wells and preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0034] Preparation of imidazoline derivatives

[0035] (1) Put 0.15mol of oleic acid and 0.16mol of diethylenetriamine into a three-necked flask, add 30mL of xylene as a water-carrying agent, heat and stir, and raise the temperature to 180°C for 5 hours, and judge the reaction by taking liquid and measuring infrared spectrum Whether end; After the reaction finishes, use rotary evaporator to steam excess solvent, obtain imidazoline intermediate (R 1 is C 17 h 33 , R 2 is amino). Equimolar imidazoline intermediates and glacial acetic acid were put into a three-necked flask, and reacted at 120° C. for 2 hours to obtain imidazoline derivative 1#.

[0036] (2) Put 0.15mol oleic acid and 0.16mol hydroxyethylethylenediamine into a three-necked flask, add 30mL xylene as a water-carrying agent, heat and stir, heat up to 180°C for 5 hours, and measure the infrared spectrum by taking the liquid Judging whether the reaction ends; after the reaction ends, steam the excess solvent with...

Embodiment 1

[0046] Take 25g of imidazoline derivative 1#, 30g of alkyl phosphate ester 1#, 0.5g of thiourea, add water to 100g, and stir well to prepare corrosion inhibitor A.

[0047] The evaluation results of corrosion inhibitor A are shown in Table 2:

[0048] Table 2 Static hanging test results

[0049]

Embodiment 2

[0051] Take 20g of imidazoline derivative 1#, 25g of alkyl phosphate 1# and 1g of thiourea prepared above, add water to 100g, stir well, and prepare corrosion inhibitor B. The corrosion inhibition performance was evaluated by the static coupon method, and the evaluation medium was simulated brine saturated with carbon dioxide. When the dosage was 50mg / L, the corrosion rate was 0.02548mm / a, and the corrosion inhibition rate was 95.12%.

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Abstract

The invention discloses a corrosion inhibitor for oil wells and a preparation method. The corrosion inhibitor includes the following components by weight: 20-40% of an imidazoline derivative, 25-35% of alkyl phosphate, 0.2-1% of thiourea, and the balance water. Specifically, the imidazoline derivative is prepared by subjecting imidazoline to water-soluble modification, and the alkyl phosphate has a molecular formula shown in the description, wherein n=4-20, and M=7-19. The method comprises: mixing and stirring the components uniformly according to the amounts so as to prepare the corrosion inhibitor for oil wells. The corrosion inhibitor provided in the invention can make corrosion inhibitor molecules arranged on a metal surface compactly, so that contact of the metal and a corrosive substance is greatly reduced, thus effectively inhibiting corrosion.

Description

technical field [0001] The invention relates to the field of oil drilling, and more specifically relates to a corrosion inhibitor for oil wells and a preparation method. Background technique [0002] At present, my country's oilfields are mainly developed by water flooding. The produced water of the oilfield contains a large amount of minerals, bacteria, etc., which is very easy to corrode the wellbore and related equipment of the production well; some oil wells have CO dissolved in the produced fluid. 2 、H 2 S and other corrosive gases, the corrosion is more serious. According to literature reports, the average loss due to corrosion in the petroleum and petrochemical industry accounts for about 6% of the output value. If proper protective measures are taken, 30% to 40% of the corrosion loss can be recovered. At present, the methods for suppressing the corrosion of oil and water wells in the oil field include: using special corrosion-resistant steel, metal surface coating...

Claims

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Application Information

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IPC IPC(8): C09K8/54
Inventor 马涛王海波谭中良
Owner CHINA PETROLEUM & CHEM CORP
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