Corrosion inhibitor for oil and gas wells, and preparation method and application thereof

Abstract

The invention provides a corrosion inhibitor for oil and gas wells, and a preparation method and application thereof. The corrosion inhibitor comprises, by weight (100%), 40 to 60% of an imidazoline derivative, 8 to 40% of organic phosphonate, 30 to 50% of a dispersant and 2 to 15% of a surfactant. The corrosion inhibitor for the oil and gas wells in the invention has high-temperature resistance,stable performance and excellent corrosion inhibition effect, can be used as a broad-spectrum corrosion inhibitor for exploitation in oil and gas fields, and overcomes the shortcomings of conventionalcorrosion inhibitors; the corrosion inhibitor is applicable to crude oil medium environment s in oil well, gas medium environments in gas wells, and water medium environments in water injection wellsin oil fields; and the corrosion inhibitor has good effect on improving the corrosion resistance of metal equipment used in a H2S-CO2-Cl<-> system with high temperature and high salinity during the exploitation of oil and gas wells.

Description

Technical field

[0001] The invention belongs to the technical field of oil field development, and relates to a corrosion inhibitor for oil and gas wells, and a preparation method and application thereof. Background technique

[0002] Corrosion has always been an important issue limiting the continuous and rapid development of oil and gas fields. Every year, oil and gas exploitation will face crises such as tubing fracture, casing damage, and scrapped oil wells caused by corrosion damage. Especially in recent years, as the corrosive environment of oil and gas fields has become more complicated and worsening (including H 2 S. The increase in water content) has gradually become prominent, and the replacement of equipment materials or surface coatings alone can no longer keep up with the corrosion protection requirements of oil and gas field mining. Therefore, adding corrosion inhibitors, as the most economical, effective, and versatile corrosion protection method, has become a brea...

Examples

Embodiment 1

[0027] The present embodiment provides a corrosion inhibitor for oil and gas wells, and the corrosion inhibitor for oil and gas wells includes:

[0028]

[0029] This implementation also provides a preparation method of the oil and gas well corrosion inhibitor: according to the above ratio, imidazoline derivatives, 2-phosphonobutane-1,2,4-tricarboxylic acid, isopropanol and dodecylbenzenesulfonate It is prepared by mixing and stirring sodium and so on.

[0030] This implementation also provides the corrosion inhibitor for oil and gas wells to enhance the metal equipment in the high temperature and high salinity H 2 S-CO 2 -Cl - Application of corrosion resistance in the system.

Embodiment 2

[0032] The present embodiment provides a corrosion inhibitor for oil and gas wells, and the corrosion inhibitor for oil and gas wells includes:

[0033]

[0034] This implementation also provides a preparation method of the oil and gas well corrosion inhibitor: according to the above ratio, imidazoline derivatives, 2-phosphonobutane-1,2,4-tricarboxylic acid, isopropanol and dodecylbenzenesulfonate It is prepared by mixing and stirring sodium and so on.

[0035] This implementation also provides the corrosion inhibitor for oil and gas wells to enhance the metal equipment in the high temperature and high salinity H 2 S-CO 2 -Cl - Application of corrosion resistance in the system.

Embodiment 3

[0037] The present embodiment provides a corrosion inhibitor for oil and gas wells, and the corrosion inhibitor for oil and gas wells includes:

[0038]

[0039] This implementation also provides a preparation method of the oil and gas well corrosion inhibitor: according to the above ratio, imidazoline derivatives, 2-phosphonobutane-1,2,4-tricarboxylic acid, isopropanol and dodecylbenzenesulfonate It is prepared by mixing and stirring sodium and so on.

[0040] This implementation also provides the corrosion inhibitor for oil and gas wells to enhance the metal equipment in the high temperature and high salinity H 2 S-CO 2 -Cl - Application of corrosion resistance in the system.

[0041] The preparation methods of the imidazoline derivatives in the foregoing Examples 1-3 are as follows:

[0042] Step 1: React diethylenetriamine and oleic acid at 140-180°C for 3-4 hours, and vacuum dehydration to obtain intermediates. The specific reaction formula is as follows:

[0043]

[0044] Step 2:...

Technical field

[0001] The invention belongs to the technical field of oil field development, and relates to a corrosion inhibitor for oil and gas wells, and a preparation method and application thereof. Background technique

[0002] Corrosion has always been an important issue limiting the continuous and rapid development of oil and gas fields. Every year, oil and gas exploitation will face crises such as tubing fracture, casing damage, and scrapped oil wells caused by corrosion damage. Especially in recent years, as the corrosive environment of oil and gas fields has become more complicated and worsening (including H 2 S. The increase in water content) has gradually become prominent, and the replacement of equipment materials or surface coatings alone can no longer keep up with the corrosion protection requirements of oil and gas field mining. Therefore, adding corrosion inhibitors, as the most economical, effective, and versatile corrosion protection method, has become a brea...

Examples

Embodiment 1

[0027] The present embodiment provides a corrosion inhibitor for oil and gas wells, and the corrosion inhibitor for oil and gas wells includes:

[0028]

[0029] This implementation also provides a preparation method of the oil and gas well corrosion inhibitor: according to the above ratio, imidazoline derivatives, 2-phosphonobutane-1,2,4-tricarboxylic acid, isopropanol and dodecylbenzenesulfonate It is prepared by mixing and stirring sodium and so on.

[0030] This implementation also provides the corrosion inhibitor for oil and gas wells to enhance the metal equipment in the high temperature and high salinity H 2 S-CO 2 -Cl - Application of corrosion resistance in the system.

Embodiment 2

[0032] The present embodiment provides a corrosion inhibitor for oil and gas wells, and the corrosion inhibitor for oil and gas wells includes:

[0033]

[0034] This implementation also provides a preparation method of the oil and gas well corrosion inhibitor: according to the above ratio, imidazoline derivatives, 2-phosphonobutane-1,2,4-tricarboxylic acid, isopropanol and dodecylbenzenesulfonate It is prepared by mixing and stirring sodium and so on.

[0035] This implementation also provides the corrosion inhibitor for oil and gas wells to enhance the metal equipment in the high temperature and high salinity H 2 S-CO 2 -Cl - Application of corrosion resistance in the system.

Embodiment 3

[0037] The present embodiment provides a corrosion inhibitor for oil and gas wells, and the corrosion inhibitor for oil and gas wells includes:

[0038]

[0039] This implementation also provides a preparation method of the oil and gas well corrosion inhibitor: according to the above ratio, imidazoline derivatives, 2-phosphonobutane-1,2,4-tricarboxylic acid, isopropanol and dodecylbenzenesulfonate It is prepared by mixing and stirring sodium and so on.

[0040] This implementation also provides the corrosion inhibitor for oil and gas wells to enhance the metal equipment in the high temperature and high salinity H 2 S-CO 2 -Cl - Application of corrosion resistance in the system.

[0041] The preparation methods of the imidazoline derivatives in the foregoing Examples 1-3 are as follows:

[0042] Step 1: React diethylenetriamine and oleic acid at 140-180°C for 3-4 hours, and vacuum dehydration to obtain intermediates. The specific reaction formula is as follows:

[0043]

[0044] Step 2:...

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