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Annular protection fluid corrosion inhibitor for oil and gas well, preparation method and use method

An annular protective fluid and corrosion inhibitor technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as corrosion and perforation of oil pipelines, avoid corrosion under scale, slow release High efficiency, uniform and dense adsorption film

Active Publication Date: 2021-07-20
四川澳凯化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides an annulus protection liquid corrosion inhibitor for oil and gas wells, a preparation method and a use method for solving failure problems such as corrosion and perforation of oil pipelines caused by corrosion in the production process of oil and gas wells

Method used

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  • Annular protection fluid corrosion inhibitor for oil and gas well, preparation method and use method
  • Annular protection fluid corrosion inhibitor for oil and gas well, preparation method and use method
  • Annular protection fluid corrosion inhibitor for oil and gas well, preparation method and use method

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preparation example Construction

[0037] A kind of annulus protection fluid corrosion inhibitor for oil and gas wells, the preparation method of butynediols Mannich base comprises the following steps:

[0038] Step 1: Fully mix butynediol, paraformaldehyde, piperazine and solvent evenly to form mixture A; wherein the molar ratio of butynediol, paraformaldehyde and piperazine is 1:1.5~2.5:1.5~2.5 ;

[0039] Step 2: Adjust the pH value of the mixture A obtained in Step 1 to 2-3, heat up to the solvent reflux temperature, and keep it warm for 5 hours to obtain the required Mannich base. Hydrochloric acid with a mass percentage of 30 wt% was used as a reaction catalyst, and the pH value of the mixture A was adjusted.

[0040] A preparation method of annulus protection fluid corrosion inhibitor for oil and gas wells, comprising the following steps:

[0041] S11: Weigh each component raw material according to the weight percentage in claim 1;

[0042] S21: Fully stir the raw materials of each component at room te...

Embodiment 1

[0047] Follow the steps below to prepare annulus protection fluid corrosion inhibitor for oil and gas wells:

[0048] Step 1: butynediol, paraformaldehyde, piperazine are added in the there-necked flask, then add toluene and mix uniformly to form mixture A; wherein the mol ratio of butynediol, paraformaldehyde, piperazine is 1:2: 1.5;

[0049] Step 2: Adjust the pH value of the mixture A obtained in Step 1 to 2-3, heat up to the solvent reflux temperature, and keep it warm for 5 hours to obtain the required Mannich base. Hydrochloric acid with a mass percentage of 30 wt% was used as a reaction catalyst, and the pH value of the mixture A was adjusted.

[0050] Step 3: Weigh the raw materials of each component according to the following mass percentages:

[0051] Butynediol Mannich base 40%, glutaraldehyde 5%, polyaspartic acid 5%, polyacrylic acid 5%, octylphenol polyoxyethylene ether 5%, dimethylformamide 40%;

[0052] Step 4: Stir the components in step 3 and mix them well...

Embodiment 2

[0064] Follow the steps below to prepare annulus protection fluid corrosion inhibitor for oil and gas wells:

[0065] Step 1: butynediol, paraformaldehyde, piperazine are added in the there-necked flask, then add toluene and mix uniformly to form mixture A; wherein the mol ratio of butynediol, paraformaldehyde, piperazine is 1:1.5: 1.5;

[0066] Step 2: Adjust the pH value of the mixture A obtained in Step 1 to 2-3, heat up to the solvent reflux temperature, and keep it warm for 5 hours to obtain the required Mannich base. Hydrochloric acid with a mass percentage of 30 wt% was used as a reaction catalyst, and the pH value of the mixture A was adjusted.

[0067] Step 3: Weigh the raw materials of each component according to the following mass percentages:

[0068] Butynediol Mannich base 20%, formaldehyde 15%, polyaspartic acid 7.5%, polyacrylic acid 7%, octylphenol polyoxyethylene ether 7%, dimethylformamide 17%, ethanol 26.5% ;

[0069] Step 4: Stir the components in step...

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Abstract

The invention discloses an annulus protection fluid corrosion inhibitor for an oil and gas well, a preparation method and a use method. The corrosion inhibitor comprises the following components in percentage by mass: 20-40% of butynediol Mannich base, 5-15% of a bactericide, 5-15% of a scale inhibitor, 5-20% of polyacrylic acid, 5-20% of an emulsifier and 40-50% of a corrosion inhibitor solvent, wherein the components are fully stirred and uniformly mixed to obtain the required corrosion inhibitor. The corrosion inhibitor obtained by the invention belongs to a water-soluble corrosion inhibitor, can be widely applied to oxygen corrosion and hypersalinity water in an oil-gas well annulus environment, can effectively control corrosion to an oil pipe and a sleeve, and has no unpleasant pungent smell; according to the formula, the slow-release agent has high slow-release efficiency by adding only a small amount of the slow-release agent, is simple and convenient to produce; the product has good water-soluble dispersion, has uniform and compact adsorption films, and has no pitting corrosion, pitting corrosion and the like for material protection.

Description

technical field [0001] The invention relates to the technical field of metal material protection in the field of petrochemical industry, in particular to an annulus protection liquid corrosion inhibitor for oil and gas wells, a preparation method and a use method. Background technique [0002] With the development of oil and gas fields in my country, the failure problems of oil casing corrosion and perforation caused by corrosion can no longer be ignored. Especially in recent years, the continuous development of sour oil and gas fields has caused the oil casing to face more and more serious corrosion problems. Corrosion-induced damage to tubing and casing occurs frequently. Therefore, filling the oil casing annulus system with protective fluid is one of the main ways to effectively solve the oil casing corrosion. [0003] Many annular space protection fluids used for corrosion in my country use imidazoline and its derivatives as the main agent, compounded with other active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C09K8/52C07D295/088
CPCC09K8/54C09K8/52C07D295/088C09K2208/32
Inventor 谢萍毅蔡潇潇李春江左琦
Owner 四川澳凯化工有限公司
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