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Acidizing corrosion inhibitor used in self-diverting acid system as well as preparation method and application thereof

A technology of acidifying corrosion inhibitor and diverting acid, which is applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc. It can solve the problems of steel surface corrosion, poor long-term performance, environmental pollution, etc., and achieve the effect of strong high temperature resistance

Inactive Publication Date: 2017-02-15
SICHUAN WELDON CHEM
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Problems solved by technology

Diverting acid is one of the most commonly used acid liquid systems in the acidizing process. In the current application of the diverting acid system, due to the large proportion of high-temperature wells, the corrosion inhibitors in use are generally not resistant to high temperatures, and there are long-term effects. Poor performance and serious stratum loss, etc., especially when the residual acid solution is flowed back, the steel surface is severely corroded, which brings huge economic losses to production and leads to environmental pollution and other issues.

Method used

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Embodiment Construction

[0017] The present invention will be further described in detail in conjunction with specific embodiments below.

[0018] An acidifying corrosion inhibitor used in a diverting acid system, the corrosion inhibitor is compounded from a main agent of a corrosion inhibitor, a synergist of corrosion inhibition, a co-solvent and a solvent.

[0019] In this embodiment, the main agent of the corrosion inhibitor is cyclohexanone, aniline and paraformaldehyde.

[0020] In this embodiment, the corrosion inhibition synergist is propynyl alcohol.

[0021] In this embodiment, the co-solvents are isopropanol, formamide and Pyrex.

[0022] In this embodiment, the solvent is methanol.

[0023] A kind of preparation method of the acidification corrosion inhibitor used in diverting acid system, comprises the following steps:

[0024] Step 1. React cyclohexanone, aniline and paraformaldehyde at a molar mass of 1:1:1 at 110°C for 8 hours to obtain a reddish-brown transparent liquid, which is th...

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Abstract

The invention discloses a preparation method of high-efficient high-temperature acidizing corrosion inhibitor used in a self-diverting acid system. The corrosion inhibitor is compounded by a corrosion inhibitor main agent, a corrosion inhibition synergist, a cosolvent, and a solvent. The corrosion inhibitor guarantees corrosion of oil pipes and bushings due to self-diverting acid in the whole construction process is reduced to the minimum.

Description

technical field [0001] The invention belongs to the field of oilfield acidification, and in particular relates to an acidification corrosion inhibitor used in a diverting acid system, a preparation method and application thereof. Background technique [0002] As each oil field enters the late stage of oil and natural gas exploitation, the difficulty of oil and gas extraction gradually increases. Acidizing process is an important means to increase oil and gas production. Dissolution and dissolution, restore or improve the permeability of gas layers, and achieve technical measures to increase production of oil and gas wells. Diverting acid is one of the most commonly used acid liquid systems in the acidizing process. In the current application of the diverting acid system, due to the large proportion of high-temperature wells, the corrosion inhibitors in use are generally not resistant to high temperatures, and there are long-term effects. Especially when the residual acid so...

Claims

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Application Information

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IPC IPC(8): C09K8/74C09K8/54E21B43/27
CPCC09K8/74C09K8/54C09K2208/32E21B43/26
Inventor 何伟王彬支亚靓
Owner SICHUAN WELDON CHEM
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