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A kind of preparation method of offshore oilfield liquid composite desulfurizer

A technology for offshore oil fields and desulfurizers, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of unsuitable desulfurization methods, damage to equipment production, and difficulty in removing sulfur scale, so as to ensure high desulfurization efficiency, The effect of improving the efficiency of use and improving the sulfur capacity

Active Publication Date: 2020-10-30
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited space in offshore oilfields, the desulfurization method of conventional large-scale tower equipment is not applicable. According to the unique oil recovery method of offshore oil and the characteristics of H2S distribution in oil and gas pipelines, the method of injecting liquid desulfurizer into pipelines is often used to remove H2S in drilling pipelines
At present, the pipeline filling method uses more desulfurizers with alcohol amines as the main agent. Alcohol amines use the principle of chemical adsorption to remove hydrogen sulfide. The adsorption speed is fast and the efficiency is high at low temperatures. However, due to the reversible reaction, high temperature When hydrogen sulfide is released, hydrogen sulfide and carbon dioxide are absorbed at the same time, resulting in waste of raw materials
On the market, instead of alcohol amines, triazine-based formula products are used. 1,3,5-tris(2-hydroxyethyl)-hexahydro-s-triazine has high absorption efficiency and high speed for hydrogen sulfide removal. It is fast, the reaction is completely irreversible, and it avoids the use limitation and influence of alcohol amine desulfurizers on temperature, so it is widely used. However, triazine desulfurizers also have low sulfur capacity, and they are prone to produce dithiazine and three Thiazide precipitates to block the pipeline, and at the same time, the sulfur scale is difficult to remove, which will damage the equipment and cause the production to be paralyzed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Add 244.3g ethanolamine, 300g hexanaphthene to the reactor equipped with water separator. Turn on the stirring, raise the temperature to 40°C, and add 92.8 g of glyoxal dropwise. After dripping, keep the reaction at 50°C for 1 hour, then raise the temperature to 90°C, and use a water separator to separate the water produced by the reaction. After the water separation is completed, the solvent is distilled off under reduced pressure. Finally, the reaction was detected by gas chromatography, and 227.2 g of 2,2-bisoxazolidine was obtained after the end.

[0025] 2. Add 350g of 2,2-bisoxazolidine, 120g of hydroxyethylhexahydro-s-triazine, 90g of piperazine, 100g of sulfolane, 10g of sodium nitrite, and dioctyl sulfosuccinate into the stirred reactor Sodium 5g, defoamer 1g, distilled water 324g, start stirring, and react at room temperature for 1 hour to obtain 1000g desulfurizer for offshore platforms.

Embodiment 2

[0027] 1. Add 420g diethanolamine and 300g benzene to a 2000ml reactor equipped with a water separator. Turn on the stirring, raise the temperature to 40°C, and add 92.8 g of glyoxal dropwise. After dripping, keep the reaction at 50°C for 1 hour, then raise the temperature to 90°C, and use a water separator to separate the water produced by the reaction. After the water separation is completed, the solvent is distilled off under reduced pressure. Finally, the reaction was detected by gas chromatography, and 371.2 g was obtained after the end.

[0028] 2. Add 350g of N-hydroxyethyl-2,2-bisoxazolidine, 120g of hydroxypropyl hexahydro-s-triazine, 90g of hydroxyethylpiperazine, and 100g of dimethyl sulfoxide into the stirred reactor , potassium carbonate 10g, dioctyl sodium sulfosuccinate 5g, defoamer 1g, distilled water 324g, start stirring, and react at room temperature for 1 hour to obtain 1000g of desulfurizer for offshore platforms.

Embodiment 3

[0030] 1. Add 390.4g ethanolamine and 300g heptane to the reactor equipped with water separator. Turn on the stirring, raise the temperature to 40°C, and add 92.8 g of glyoxal dropwise. After dripping, keep the reaction at 50°C for 1 hour, then raise the temperature to 90°C, and use a water separator to separate the water produced by the reaction. After the water separation is completed, the solvent is distilled off under reduced pressure. Finally, the reaction was detected by gas chromatography, and 227.2 g of 2,2-bisoxazolidine was obtained after the end.

[0031] 2. Add 2,2-bisoxazolidine 350g, hydroxypropyl hexahydro-s-triazine 120g, N-methylpiperazine 90g, dimethyl sulfoxide 30g, sulfolane 70g, carbonic acid Potassium 10g, dioctyl sodium sulfosuccinate 5g, defoamer 1g, distilled water 324g, start stirring, and react at room temperature for 1 hour to obtain 1000g of desulfurizer for offshore platforms.

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Abstract

The invention discloses a preparation method of a liquid compound desulfurizer for an offshore oilfield. The liquid compound desulfurizer comprises the following ingredients by weight percentage: 20%-35% of a 2, 2-dioxazolidine compound, 5%-10% of triazines, 2%-5% of piperazines, 1.0%-1.5% of organic alkali, 0.5%-1% of a surfactant, 0.1% of a defoaming agent, a solvent including one of sulfolane and dimethyl sulfoxide or 20%-25% of the sulfolane and the dimethyl sulfoxide and the balance of water. Through the synergistic effect of all the ingredients, the liquid compound desulfurizer used forthe oilfield has the advantages of being high in selective absorption, environmental-friendly and efficient, and high in sulfur capacity and having no precipitate and can be widely used in the field of chemical industries such as the offshore oilfield, an onshore oilfield, a coal gas field and natural gas.

Description

technical field [0001] The invention relates to a medicament synthesis and a chemical formulation for removing hydrogen sulfide gas by absorbing hydrogen sulfide in crude oil exploitation, and belongs to the field of chemical medicament synthesis, formulation and technology for oilfields. Background technique [0002] In view of the increasing depletion of land oil and gas resources, the development of offshore oil resources, especially the development of deep sea oil resources, has become an inevitable trend. When oil is extracted from an offshore oil platform, the pipeline touches the ocean bottom oil reservoir, and the seawater, crude oil, and associated gas in the oil reservoir will be extracted together. The most common gases in associated gas are CO2 and H2S. H2S gas is colorless and highly toxic, which not only brings hidden dangers to personal safety, but also corrodes production strings and pipelines and other equipment, causing hidden dangers in production. In or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/52
CPCB01D53/52B01D53/78
Inventor 宋晓莉周立山牛心蕙滕大勇赵新星滕厚开
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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