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H2S corrosion resistant ground gathering system corrosion inhibitor and preparation method thereof

A technology of gathering and transportation system and corrosion inhibitor, which is applied in the field of corrosion inhibitor of ground gathering and transportation system and the protection of metal materials, can solve the problems of short validity period, accelerated corrosion, unpleasant smell, etc., and achieves less dosage and corrosion inhibition efficiency. High, easy and fast production results

Active Publication Date: 2012-06-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of corrosion inhibitor has a good corrosion inhibition effect, but its disadvantages are its unpleasant smell, easy hydrolysis, and short validity period. For example, a patented anti-H 2 S / CO 2 Corrosion inhibitor under joint action (CN1966774), a water-soluble imidazoline amide corrosion inhibitor and its preparation and use method (CN101705112A) and a water injection corrosion inhibitor for oilfields (CN1277241) all use imidazoline derivatives as the main component
However, when there is too much unreacted thiourea in the synthetic raw material of this corrosion inhibitor, corrosion will be accelerated.

Method used

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  • H2S corrosion resistant ground gathering system corrosion inhibitor and preparation method thereof
  • H2S corrosion resistant ground gathering system corrosion inhibitor and preparation method thereof
  • H2S corrosion resistant ground gathering system corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation of the corrosion inhibitor is divided into two steps: the first step is the synthesis of the main agent N-benzyl-N'-phenylpiperazine, and the second step is the preparation of the corrosion inhibitor.

[0022] Pour N-phenylpiperazine and benzyl chloride into a three-necked flask at a molar ratio of 1.3:1, stir and mix evenly, heat up to 170°C, and keep warm for 8 hours to obtain N-benzyl-N'-phenylpiper Zinc.

[0023] Then the mass percentage is 40% of N-benzyl-N'-phenylpiperazine, 7% of methoxypropylamine, 7% of hydroxyethylene diphosphoric acid, 7% of monomethylamine, 7% of trimethyl Amine, 8% octylphenol polyoxyethylene ether, and 24% dimethylformamide are mixed and stirred evenly to prepare a H 2 S Corrosion inhibitor for surface gathering pipeline corrosion, code name TG530-Z I.

[0024] In order to test the corrosion inhibitor - TG530-Z I against H 2 The protective effect of S corrosion was evaluated by using the high temperature and high pressur...

Embodiment 2

[0035] Pour N-phenylpiperazine and benzyl chloride into a three-necked flask at a molar ratio of 1.3:1, stir and mix evenly, heat up to 140°C, and keep warm for 8 hours; then add 20% N-benzyl Base-N'-phenylpiperazine, 10% methoxypropylamine, 7.5% hydroxyethylene diphosphate, 7% dimethylamine, 7% trimethylamine, 7% octylphenol polyoxyethylene Ether, 10% dimethylformamide, and 31.5% methanol are mixed and stirred evenly to prepare a H 2 S Corrosion inhibitor for surface gathering pipeline corrosion, code name TG530-Z II.

[0036] Through the high temperature and high pressure test, simulate the environment of Table 1 and Table 2 working conditions in Example 1, under the condition that the test cycle is 7 days, when the corrosion inhibitor-TG530-Z II dosage is 100mg / L, its corrosion rate It is 0.0831mm / a, and the corrosion inhibition rate reaches 90.82%.

[0037] Macro photo of specimen corrosion figure 1 , figure 2 Shown: Through comparison, it can be seen that the corrosi...

Embodiment 3

[0039] First, the preparation of N-benzyl-N'-phenylpiperazine is carried out. Pour N-phenylpiperazine and benzyl chloride into a three-neck flask at a molar ratio of 1.3:1, stir and mix evenly, raise the temperature to 140°C, and keep the reaction for 8 hours.

[0040] Then, 40% of N-benzyl-N'-phenylpiperazine, 10% of methoxypropylamine, 7% of hydroxyethylene diphosphoric acid, 7% of monomethylamine, 7% of Ethylene oxide condensate, 10% dimethylformamide, and 19% methanol are mixed and stirred evenly to obtain a H 2 S Corrosion inhibitor for ground gathering pipeline corrosion, code name TG530-Z III.

[0041] Through the high temperature and high pressure simulation test, the corrosion rate of the coupon sample added with the corrosion inhibitor-TG530-Z III is shown in Table 4.

[0042] Table 4 Corrosion rate under different corrosion inhibitor dosage

[0043] Corrosion inhibitor dosage, mg / L

Corrosion rate, mm / a

Corrosion inhibition rate, %

0

...

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Abstract

The invention discloses an H2S corrosion resistant ground gathering system corrosion inhibitor and a preparation method thereof. The H2S corrosion resistant ground gathering system corrosion inhibitor comprises the following ingredients in mass percent: 20-40% of main ingredient, N-benzyl-N '-phenylpiperazine and 60-80% of compound, wherein the compound comprises the following ingredients in masspercent: 5-15% of methoxy propyl amine, 5-15% of hydroxy ethylidene diphosphate, 5-20% of methylamine, 5-20% of emulsifying agent and 40-50% of solvent; the main ingredient, N-benzyl-N '-phenylpiperazine is prepared by N-phenylpiperazine and benzyl chloride. The corrosion inhibitor of the invention is a water-soluble corrosion inhibitor, so that the corrosion inhibitor can be extensively applied in the H2S corrosion and high mineralization water of pipelines in the ground gathering system to effectively control the H2S corrosion on the metallic materials in the ground gathering pipelines; besides, the corrosion inhibitor has the advantages of non pungent smell, little dosage, high corrosion inhibition efficiency, simple and convenient production, good water-soluble dispersibility, uniformand dense adsorption film, and non spot corrosion or pointed corrosion on material protection.

Description

technical field [0001] The invention belongs to the protection of metal materials in the field of petrochemical industry, in particular to an anti-H 2 Corrosion inhibitor for surface gathering and transportation system of S corrosion. Background technique [0002] With the substantial increase of sulfur content in crude oil transportation in my country, failure problems such as corrosion and perforation of oil pipelines caused by hydrogen sulfide corrosion can no longer be ignored. Especially in recent years containing H 2 The continuous development of sour oil and gas fields of S and foreign countries containing H 2 The continuous increase in the input of S crude oil has caused the oil pipeline to face more and more serious sulfur corrosion problems. h 2 The destruction of ground gathering and transportation system caused by S corrosion often occurs. Therefore, adding corrosion inhibitors to the ground gathering and transportation system is one of the main ways to effe...

Claims

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Application Information

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IPC IPC(8): C23F11/04
Inventor 张娟涛冯耀荣白真权尹成先
Owner BC P INC CHINA NAT PETROLEUM CORP
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