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A high temperature and high pressure corrosion inhibitor with high sulfur content

A technology with high sulfur content and corrosion inhibitors, which is applied in drilling compositions, wellbore/well components, chemical instruments and methods, etc., and can solve the problems that corrosion inhibitors cannot withstand high temperature, high pressure, high hydrogen sulfide content, etc. , to achieve the effect of improving corrosion inhibition effect, enhancing penetration and compact structure

Active Publication Date: 2022-05-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a corrosion inhibitor resistant to high temperature, high pressure and high sulfur content to solve the problem that the existing corrosion inhibitors cannot withstand high temperature, high pressure and high hydrogen sulfide content

Method used

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  • A high temperature and high pressure corrosion inhibitor with high sulfur content
  • A high temperature and high pressure corrosion inhibitor with high sulfur content
  • A high temperature and high pressure corrosion inhibitor with high sulfur content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of corrosion inhibitor main agent:

[0023] Add 1mol of 4,7-dibromo-5,6-difluoro-2,1,3-benzothiadiazole and 1.7mol of potassium thiocyanate to 30ml of ethanol solvent and heat to 70-80°C Carry out reflux reaction for 5-8h to obtain the main corrosion inhibitor.

Embodiment 2

[0025] A preparation method of corrosion inhibitor main agent:

[0026] Add 1mol of 4,7-dibromo-5,6-difluoro-2,1,3-benzothiadiazole and 1.9mol of potassium thiocyanate to 40ml of ethanol solvent and heat to 70-80°C Carry out reflux reaction for 5-8h to obtain the main corrosion inhibitor.

Embodiment 3

[0028] A high-temperature, high-pressure, high-sulfur corrosion inhibitor, which includes the following components in mass percentage: 40% main corrosion inhibitor (prepared in Example 1), 10% N,N-dimethyl-3-perfluoro Octylsulfonamidopropylammonium iodide, 10% thiourea, 40% ethanol.

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Abstract

The invention discloses a high-temperature, high-pressure and high-sulfur corrosion inhibitor, which comprises the following components in mass percentage: 40-50% of a main corrosion inhibitor, 10-20% of a synergist, and 30-40% of a solvent; The corrosion inhibitor main agent is made of 4,7-dibromo-5,6-difluoro-2,1,3-benzothiadiazole and potassium thiocyanate as raw materials in an ethanol solvent at a reflux temperature of 70-80°C for 5 ‑8h prepared. The molar ratio of 4,7-dibromo-5,6-difluoro-2,1,3-benzothiadiazole to potassium thiocyanate is 1: (1.7-1.9). The synergist is fluorocarbon surfactant or thiourea or a combination of both. The solvent is methanol or ethanol. The corrosion inhibitor of the invention can effectively inhibit the corrosion of metals in high-temperature, high-pressure and high-sulfur environments, and can be widely used in the corrosion protection process of oil and gas fields and gathering and transportation systems.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a corrosion inhibitor resistant to high temperature, high pressure and high sulfur content. Background technique [0002] With the continuous development of oil and gas fields, the extracted oil and gas often contain high concentration and strong volatility of hydrogen sulfide (H 2 S), which seriously threatens the safety of the oil field and the stability of operation and production. High concentration of H 2 S gas can lead to corrosion and perforation of oil field equipment, which has serious harm to human body and ecological environment. Develop a method that can effectively control H 2 S corrodes or weakens H 2 The technology of S corrosion is crucial to oil field safety and stable production. Corrosion inhibitor is a substance that exists in a corrosive environment in an appropriate form and concentration, and can effectively prevent or slow down material cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54C23F11/02
CPCC09K8/54C23F11/02
Inventor 钟显康郑子奇扈俊颖张智
Owner SOUTHWEST PETROLEUM UNIV