A kind of composite type oilfield corrosion inhibitor and preparation method thereof

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

Active Publication Date: 2019-12-03
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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  • A kind of composite type oilfield corrosion inhibitor and preparation method thereof
  • A kind of composite type oilfield corrosion inhibitor and preparation method thereof
  • A kind of composite type oilfield corrosion inhibitor and preparation method thereof

Examples

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Effect test

preparation example Construction

[0040] According to another aspect of the present invention, the present invention provides a preparation method of a compound oilfield corrosion inhibitor, comprising the following steps:

[0041] (1) Prepare liquid A

[0042] In the first reaction kettle, drop into the mixed solution of acetophenone and absolute ethanol, add hydrochloric acid dropwise while stirring, adjust the pH value of the solution to 2, and add dropwise formaldehyde and cyclohexylamine respectively at 80 ° C, the reaction is refluxed for 10 hours, adding A small amount of absolute ethanol was stirred to obtain a reddish-brown liquid, which was then compounded with potassium iodide and propargyl alcohol to obtain a Mannich corrosion inhibitor solution, and then added fatty alcohol polyoxyethylene ether and fatty alcohol polyoxyethylene ether phosphate at normal temperature and pressure, Prepare liquid A. Among them, the Mannich corrosion inhibitor A solution is a Mannich acidification corrosion inhibito...

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, stir evenly, slowly add hydrochloric acid solution dropwise, and adjust the pH of the solution to 2. 68 mL of formaldehyde and 47 mL of cyclohexylamine were simultaneously added dropwise at about 80°C using a constant pressure dropping funnel, refluxed for 10 hours, a small amount of absolute ethanol was added, and the mixture was stirred evenly. Add 36g of potassium iodide and 80mL of propynyl alcohol to make A solution.

[0059] (2) Preparation of liquid B:

[0060] Put 146 grams of oleic acid and 206 grams of diethylenetriamine into another five-neck glass flask, stir evenly, and add 39 grams of xylene. Raise the temperature to 140-150°C and reflux for 4 hours. The temperature was raised to 180°C to evaporate xylene, and the temperature was continued to rise to 250°C for 4 hours. After that, the temperature was lowered to 120° C., 50 g of ...

Embodiment 2

[0063] Adopt the same method as Example 1 to prepare A liquid and B liquid;

[0064] The A solution and the B solution are respectively 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 compound oilfield corrosion inhibitor and a preparation method thereof. Background technique [0002] The petrochemical industry is the basis for the development of a country's national economy. With the development of the oil recovery stage, most of the oil fields in my country have entered the tertiary oil recovery stage. 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 underground environment is relatively harsh, which is prone to chemical corrosion. , seriously affecting the normal production of oil fields. Due to the harsh underground operating environment, oil and water pipelines are often in the environment of high temperature, high salt and low pH value, and the corrosion problem is relatively...

Claims

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Application Information

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Patent Type & Authority Patents(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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