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Compounded oil field corrosion inhibitor and preparation method thereof

A corrosion inhibitor and oilfield technology, applied in the field of oilfield water treatment, can solve the problems of aggravated corrosion, failure of corrosion inhibitor, failure to slow down the corrosion of oil and water pipelines, etc., and achieves the effect of delaying corrosion rate, saving costs, and facilitating large-scale popularization and application.

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because traditional corrosion inhibitors are sensitive to environmental changes, harsh environments such as high temperature, high salt, and low pH value will change the composition of ordinary corrosion inhibitors, resulting in the failure of corrosion inhibitors, which cannot slow down the corrosion of oil-water pipelines or even aggravate corrosion.

Method used

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  • Compounded oil field corrosion inhibitor and preparation method thereof
  • Compounded oil field corrosion inhibitor and preparation method thereof
  • Compounded oil field corrosion inhibitor and preparation method thereof

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preparation example Construction

[0040] According to another aspect of the present invention, the present invention provides a kind of preparation method of compound type oil field corrosion inhibitor, comprises the following steps:

[0041] (1) Preparation of liquid A

[0042] Put a mixed solution of acetophenone and absolute ethanol into the first reaction kettle, add hydrochloric acid dropwise while stirring, adjust the pH value of the solution to 2, add formaldehyde and cyclohexylamine dropwise at 80°C, react under reflux for 10 hours, add Stir a small amount of absolute ethanol to obtain a reddish-brown liquid, then compound with potassium iodide and propynyl alcohol to obtain a Mannich corrosion inhibitor solution, then add fatty alcohol polyoxyethylene ether and fatty alcohol polyoxyethylene ether phosphate under normal temperature and pressure, Prepare liquid A. Among them, the Mannich corrosion inhibitor A solution is a Mannich acidification corrosion inhibitor of the aromatic ketone Mannich base se...

Embodiment 1

[0057] (1) Preparation of liquid A:

[0058] Add 160 mL of absolute ethanol into a five-neck glass flask, add 47 mL of acetophenone and stir evenly, slowly add hydrochloric acid solution dropwise, and adjust the pH value of the solution to 2. Add 68mL of formaldehyde and 47mL of cyclohexylamine dropwise at about 80°C at the same time using a constant pressure dropping funnel, reflux for 10 hours, add a small amount of absolute ethanol, and stir evenly. Add 36g of potassium iodide and 80mL of propynyl alcohol to compound A liquid.

[0059] (2) Preparation of liquid B:

[0060] 146 grams of oleic acid and 206 grams of diethylenetriamine were dropped into another five-necked glass flask and stirred evenly, and 39 g of xylene was added. Raise the temperature to 140-150°C and reflux for 4 hours. Heat up to 180°C to evaporate xylene, then continue to heat up to 250°C for 4 hours. After cooling down to 120°C, add 50g of formic acid and 50g of formaldehyde, stir evenly and add 56g...

Embodiment 2

[0063] Adopt the method identical with embodiment 1 to prepare A liquid and B liquid;

[0064] The A solution and the B solution were compounded according to the volume ratio of 1:1 to obtain the compound oilfield corrosion inhibitor II.

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Abstract

The invention relates to the field of oil field water treatment, in particular to compounded oil field corrosion inhibitor and a preparation method thereof. The compounded oil field corrosion inhibitor comprises liquid A and liquid B, wherein the volume ratio of the liquid A to the liquid B is 1: 3; the liquid A comprises, by weight percent, 5%-15% of aromatic ketone mannich base, 3%-10% of fattyalcohol-polyoxyethylene ether, 0.5%-3% of fatty alcohol-polyoxyethylene ether phosphate, 5%-15% of ethyl alcohol, 2%-10% of propargyl alcohol, 15%-35% of hydrochloric acid, 3%-10% of potassium iodideand the balance water; and the liquid B comprises, by weight percent, 5%-15% of oleic acid imidazoline, 5%-10% of fatty alcohol-polyoxyethylene ether, 2%-7% of fatty alcohol-polyoxyethylene ether phosphate, 4%-13% of ethyl alcohol, 2%-8% of formic acid and the balance water. The compounded oil field corrosion inhibitor is suitable for working conditions of an underground oil and water pipeline andeasy and convenient to use and is conveniently applied and popularized on a large scale.

Description

technical field [0001] The invention relates to the field of oilfield water treatment, in particular to a composite oilfield corrosion inhibitor and a preparation method thereof. Background technique [0002] The petrochemical industry is the foundation of a country's national economic development. With the development of the oil recovery stage, most oil fields in my country have entered the tertiary oil recovery stage. Various chemical additives, especially oil displacement agents, are used to treat the remaining crude oil in the reservoir. mining. The oil displacement agent and the produced high-quality crude oil need to be transported through oil-water pipelines, but the pipelines used to transport oil and water are mostly made of metal materials, and the downhole environment is relatively harsh, which is prone to chemical composition corrosion , seriously affecting the normal production of the oil field. Due to the harsh environment of downhole operations, oil-water pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10
CPCC23F11/10
Inventor 张志宏石鑫李芳许艳艳刘强朱原原赵毅羊东明高秋英肖雯雯葛鹏莉马清杰石锐黄明良关磊
Owner CHINA PETROLEUM & CHEM CORP
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