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Corrosion inhibitor for gas field and preparation method thereof

A corrosion inhibitor, oil and gas field technology, applied in earthwork drilling, wellbore/well components, organic chemistry, etc., can solve problems such as difficulty in adapting to corrosive environments, poor metal surface adsorption capacity and film formation, and increase activation energy Energy, Solubility Improvement, Effect of Corrosion Reaction Inhibition

Active Publication Date: 2014-07-02
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

The corrosion inhibitor compound provided by the above two technologies has only a single adsorption center, and its adsorption capacity and film-forming property on the metal surface are poor, so it is difficult to adapt to the corrosive environment under the erosion of high-velocity media in oil-gas-water multiphase flow

Method used

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  • Corrosion inhibitor for gas field and preparation method thereof
  • Corrosion inhibitor for gas field and preparation method thereof
  • Corrosion inhibitor for gas field and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1, prepare imidazoline intermediate:

[0042] Adding octanoic acid and diethylenetriamine with a molar ratio of 1:1.15 in a reactor with a stirring and distillation device, and adding water-carrying agent toluene, the weight of toluene is 50% of the total weight of octanoic acid and diethylenetriamine. The three are mixed evenly, heated to 145°C, reacted at 145°C for 3 hours, continued to heat up to 242°C, reacted at 242°C for 6 hours, cooled the reactant to 140°C, and distilled off the solvent toluene and unreacted Diethylenetriamine, after cooling, an imidazoline intermediate is obtained.

[0043] Step 2, preparation of thioureido imidazoline intermediate:

[0044]Dissolve the imidazoline intermediate obtained in step 1 in toluene, the weight of toluene accounts for 80% of the total weight of the two, and then add it to the reactor with a stirring and distillation device, raise the temperature to 100 ° C, and add sulfur to the reactor Urea, the molar ratio of i...

Embodiment 2

[0048] Step 1, step 2 are identical with step 1, step 2 of embodiment 1;

[0049] Step 3 is the same as step 3 of Example 1, the only difference is that benzyl chloride is used instead of dimethyl sulfate as a quaternization reagent to prepare the quaternary ammonium salt 1-benzyl-trifluoromethylsulfonylthiourea ethyl - 2-octyl imidazolinium ammonium chloride, represented by TIM8-TFM-CMB.

Embodiment 3

[0051] Step 1, step 2 are identical with step 1, step 2 of embodiment 1;

[0052] Step 3, preparation of fluorine-containing thiourea group imidazoline quaternary ammonium salt:

[0053] Dissolve the thioureidoimidazoline intermediate TIM8 in xylene, the weight of xylene accounts for 80% of the total weight of the two, and then add it to the reactor with a stirring and distillation device, raise the temperature to 110°C, and add perfluoro Butylsulfonyl fluoride, the molar ratio of intermediate TIM8 to perfluorobutylsulfonyl fluoride is 1:1.2, after 4 hours of reaction, after cooling, the fluorine-containing thioureido imidazoline intermediate 1-perfluorobutylsulfonylthiourea is obtained Ethyl-2-octyl imidazoline, represented by TIM8-PFB. Then slowly add the quaternary chemical reagent according to the molar ratio of TIM8-PFB and p-trifluoromethylbenzyl chloride 1:1.4. After the addition, react at 100°C for 5 hours. After cooling, the unreacted substance and the solvent are se...

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Abstract

The invention discloses a corrosion inhibitor for a gas field and a preparation method thereof, belonging to the fields of corrosion and protection. The corrosion inhibitor is composed of the following components in percentage by weight: 20-60% of fluorine-containing thioureidoimidazoline quaternary ammonium salt, 10-20% of alkynol, 1-5% of nonionic surfactant and 20-60% of solvent. By using the fluorine-containing thioureidoimidazoline quaternary ammonium salt as the main component of the corrosion inhibitor, a polycentric chemical adsorption action can be generated, so that the corrosion inhibitor is adsorbed to the metal surface, and the corrosion reaction is inhibited. the fluorine substituent group is introduced to lower the surface tension of the water solution, enhance the wettability and permeability of the water solution, improve the solubility of the corrosion inhibitor in a water solution and the distribution proportionality in an oil-gas-water multiphase flow, and enhance the chemical stability of the corrosion inhibitor in high-temperature high-pressure corrosive media containing H2S, CO2 and Cl<-> and the like.

Description

technical field [0001] The invention relates to the field of corrosion and protection, in particular to an imidazoline quaternary ammonium salt corrosion inhibitor used in oil and gas fields and a preparation method thereof. Background technique [0002] During the exploitation, storage and transportation of oil and gas fields, metal equipment and pipelines are often subjected to severe corrosion. Corrosion not only causes huge economic losses, but also causes serious safety accidents, which has become a problem that plagues the development of the oil and gas industry. Rational use of corrosion inhibitors has become an economical and effective protection technology to solve this problem. [0003] The downhole temperature of oil and gas fields in western my country is as high as 180°C, and the wellbore pressure is as high as 80-100MPa. It not only has the characteristics of high temperature and high pressure, but also mostly contains H 2 S and CO 2 and other corrosive gase...

Claims

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Application Information

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IPC IPC(8): C23F11/16C09K8/54C07D233/16
Inventor 魏斌
Owner BC P INC CHINA NAT PETROLEUM CORP
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