Corrosion inhibitor suitable for hydrochloric acid system with mass fraction of 20-28% and preparation method of corrosion inhibitor

A mass fraction, corrosion inhibitor technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve problems such as disappearance, corrosion rate increase, easy coking, etc., to reduce steric hindrance effect, improve Conversion rate, effect of adsorption film densification

Active Publication Date: 2021-06-29
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some special formations, the chemical dissolution effect of low-concentration acid solution (acid solution mass fraction ≤ 20%) is limited, and it is often necessary to increase the acid solution concentration to meet the acidizing operation requirements
With the further increase of acid concentration, the corrosion rate of oil and gas well pipes or downhole metal equipment increases exponentially, causing catastrophic corrosion to related equipment, and there are extremely serious safety hazards
[0003] At present, the acidification corrosion inhibitors on the market are basically only suitable for acidification operations with low concentration (acid liquid mass fraction ≤ 20%), and there are disadvantages such as easy coking and weakened adsorption, thus reducing the corrosion inhibition effect or even disappearing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A corrosion inhibitor suitable for a hydrochloric acid system with a mass fraction of 20-28% and an ambient temperature of 90°C, the composition of which is calculated by weight percentage:

[0038] Quinoline quaternary ammonium salt: 14%;

[0039] Imidazoline quaternary ammonium salt: 14%;

[0040] Alkynol: 8%;

[0041] Acid-soluble metal salts: 3%, specifically copper chloride dihydrate;

[0042] Low molecular organic acid: 5%, specifically formic acid;

[0043] Surfactant: 1%, specifically OP-10 (polyoxyethylene octylphenol ether-10);

[0044] Organic solvent: 45%, specifically methanol;

[0045] Deionized water: 10%.

[0046] A corrosion inhibitor suitable for a hydrochloric acid system with a mass fraction of 20-28% and an ambient temperature of 90°C, the preparation method of which is as follows:

[0047] (1) Synthesis of quinoline quaternary ammonium salt:

[0048] First, the raw materials are selected by weight percentage as follows: quinoline: 39.4%; ben...

Embodiment 2

[0058] A corrosion inhibitor suitable for a hydrochloric acid system with a mass fraction of 20-28% and an ambient temperature of 120°C, the composition of which is calculated by weight percentage:

[0059] Quinoline quaternary ammonium salt: 18%;

[0060] Imidazoline quaternary ammonium salt: 18%;

[0061] Alkynol: 10%;

[0062] Acid-soluble metal salt: 5%, specifically cuprous bromide;

[0063] Low molecular organic acid: 8%, specifically a mixture of formic acid and oxalic acid, the mass ratio of the two is 2:1;

[0064] Surfactant: 2%, specifically OP series surfactants, OP-10 is still selected in this embodiment;

[0065] Organic solvent: 31%, specifically DMF (N,N-dimethylformamide);

[0066] Deionized water: 8%.

[0067] A corrosion inhibitor suitable for a hydrochloric acid system with a mass fraction of 28% and an ambient temperature of 120°C. Its preparation method is as follows:

[0068] (1) Synthesis of quinoline quaternary ammonium salt:

[0069] First, the...

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PUM

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Abstract

The invention discloses a corrosion inhibitor suitable for a hydrochloric acid system with a mass fraction of 20-28%. The corrosion inhibitor is composed of a quinoline quaternary ammonium salt, an imidazoline quaternary ammonium salt, alkynol, an acid-soluble metal salt, a low-molecular organic acid, a surfactant, an organic solvent and deionized water. The corrosion inhibitor is suitable for production increase operation construction of an ultra-high concentration hydrochloric acid system acidification oil and gas well, and has the characteristics of simple formula, good dissolution and dispersion, better corrosion inhibition performance and the like.

Description

technical field [0001] The invention relates to the technical field of oilfield acidification production increase operations, in particular to a corrosion inhibitor suitable for a hydrochloric acid system with a mass fraction of 20-28% and a preparation method and application thereof. Background technique [0002] Acidizing is an important measure for increasing production in the process of oil and gas field development. It uses the chemical dissolution of acid liquid to dissolve formation voids, blockages in fractures or rock cement, expand or extend formation fractures and caves, and reduce the resistance of oil and gas flow into wells or water injection. Resistance, so as to achieve the purpose of increasing production of oil and gas wells and increasing injection of water injection wells. However, in some special formations, the chemical dissolution effect of low-concentration acid solution (acid solution mass fraction ≤ 20%) is limited, and it is often necessary to incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C07D215/10C07D233/14
CPCC09K8/54C07D215/10C07D233/14
Inventor 徐慧赵起锋狄志刚秦俊岭王臣景佳春陈武方健君马胜军
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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