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Anti-oil well metal equipment corrosion inhibitor, preparation method and using method thereof

A technology for equipment corrosion and corrosion inhibitor, which is applied in the field of corrosion inhibitor for anti-corrosion of metal equipment in oil wells, can solve the problems of restricting the popularization and application of oleic acid bisimidazoline, poor effect and low toxicity, etc.

Inactive Publication Date: 2010-09-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, imidazoline and its salts have been widely used in oil and gas production due to their good corrosion inhibition effect on copper and iron and low toxicity. However, imidazoline corrosion inhibitors are less effective when used alone. There is no report on the synthesis and use of oleic acid bis-imidazoline, which limits the popularization and application of oleic acid bis-imidazoline in corrosion inhibition of oilfield equipment

Method used

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  • Anti-oil well metal equipment corrosion inhibitor, preparation method and using method thereof
  • Anti-oil well metal equipment corrosion inhibitor, preparation method and using method thereof
  • Anti-oil well metal equipment corrosion inhibitor, preparation method and using method thereof

Examples

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preparation example Construction

[0025] The preparation method of the corrosion inhibitor provided by the invention comprises the steps of reacting oleic acid and tetraethylenepentamine to obtain bis-imidazoline oleic acid; and uniformly mixing the bis-imidazoline oleic acid with other components of the corrosion inhibitor.

[0026] The preparation process of the bisimidazoline oleic acid includes putting oleic acid into a reaction vessel, adding tetraethylenepentamine under the condition of reflux condensation and stirring, reacting at 100°C-130°C for 2-4h, and then at 180°C- React at 250°C for 3-5h, and finally lower the temperature to 70-100°C to obtain oleic acid bis-imidazoline. The weight ratio of the amount of oleic acid and tetraethylenepentamine is preferably 1-2. Oleic acid can also be added to tetraethylenepentamine.

[0027]Add ethanol and lactic acid into water at 50-80°C, and after they are completely dissolved, add bisimidazoline oleic acid, and mix well to obtain the corrosion inhibitor provi...

Embodiment 1

[0029] Example 1 This example is used to prepare a corrosive medium.

[0030] Weigh 7.35g calcium chloride dihydrate (CaCl2 2H2O), 4.93g sodium chloride (NaCl) and dissolve in about 7L of water, and mix well after completely dissolving; another weigh 1.68g of sodium bicarbonate (NaHCO3) and dissolve in about 1L After completely dissolving in water, mix well; mix the two solutions, dilute to 10.0L with water, and mix well.

Embodiment 2

[0031] Embodiment 2 This embodiment is used for preparing bisimidazoline oleic acid

[0032] Add 113g of oleic acid into a 500ml three-necked flask, slowly add 76g of tetraethylenepentamine dropwise under the condition of reflux condensation and stirring, then turn on the power, heat in an oil bath, and react under the conditions of 110°C and 250 rpm 3h, followed by reaction at 200°C for 5h. Afterwards, the heating was stopped, and the temperature was lowered to 90° C. to obtain bis-imidazoline oleic acid.

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Abstract

The invention belongs to the field of oil field corrosion inhibitors, and in particular relates to an anti-oil well metal equipment corrosion inhibitor, a preparation method and a using method thereof. The inhibitor comprises the following components in percentage by weight: 5 to 20 percent of oleic bis-imidazoline, 3 to 9 percent of lactic acid, 5 to 30 percent of ethanol and the balance of water. The preparation method comprises the following steps of: adding the lactic acid and the ethanol into the water at the temperature of between 50 and 80 DEG C; mixing uniformly; adding the oleic bis-imidazoline into the mixture; and mixing uniformly to obtain a required product. The inhibitor is used for controlling the corrosion of oil and gas equipment; and based on the weight of a corrosive medium, the using amount of the corrosion inhibitor is 10 to 50 ppm. The product greatly improves the anti-corrosion performance of the product and is used for the corrosion inhibition of metal pipelines of oil and gas well equipment.

Description

technical field [0001] The invention belongs to the field of oilfield corrosion inhibitors, and in particular relates to a corrosion inhibitor for resisting corrosion of metal equipment in oil wells, a preparation method and a use method thereof. Background technique [0002] In recent years, with the rapid development of the economy, my country's demand for oil is increasing, and oil production has become an important industry related to the lifeline of the national economy. However, in the middle and later stages of oilfield development, a large amount of H will be produced 2 S, CO 2 , Cl - , SO 4 2- These substances are dissolved in the underground production water to form acidic liquid, which will cause corrosion to the downhole pipe string. The statistical analysis of oil pipe failures shows that 70% of oil pipe failures are related to corrosion. According to the data released by China Corrosion Society, China Petroleum Society, and China Chemical Industry Society...

Claims

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Application Information

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IPC IPC(8): C23F11/14
Inventor 张冰如李风亭弯昭锋陈宇宁
Owner TONGJI UNIV
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