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A kind of sulfur dissolving agent and preparation method thereof

A technology of dissolving sulfur agent and main solvent, which is applied to chemical instruments and methods, compositions of drilling holes, etc., can solve the problems of high cost, low solubility, high cost, etc. Effect of Sulfur Dissolving Ability

Inactive Publication Date: 2018-07-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The DMDS-DMF-NaHS sulfur-dissolving agent system proposed by ASRL in Canada and the SULFA-HITECH sulfur-dissolving agent introduced by Binhua Company in the United States have begun commercial use, but the cost is relatively high
[0006] In 2013, Li Li et al. developed a DMDS-DADS-PT sulfur dissolving agent system with better sulfur dissolving ability. The sulfur solubility of this system reached 173.6% at 25°C and 600.8% at 90°C. However, the DADS is more expensive than DMDS, and the cost is higher. Compared with its expensive price, its sulfur dissolving ability needs to be further improved
[0007] Although the low toxicity and low irritation DMA-DMB-DMC-DMF system developed by Zhang Guangdong et al. in 2014 reduces the toxicity and irritation of the system, its solubility to sulfur is much lower than that of the DMDS developed by Li Li et al. -DADS-PT system (sulfur solubility at 25°C is 81.5%, sulfur solubility at 90°C is 201.1%)

Method used

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  • A kind of sulfur dissolving agent and preparation method thereof
  • A kind of sulfur dissolving agent and preparation method thereof
  • A kind of sulfur dissolving agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] At room temperature (about 25°C), take 25 parts of the main agent (DMDS) and add it to the reaction vessel, then add 10 parts of the auxiliary solvent (DMSO), stir evenly, then add 0.125 parts of the catalyst sodium bisulfate, continue stirring evenly, and add the co-catalyst Add 0.25 parts of naphthalene, stir evenly without adding a phase transfer catalyst to obtain a sulfur dissolving agent, and conduct experiments on dissolving sublimated sulfur powder at 25°C, 80°C, and 90°C respectively, and the results are shown in the attached figure 1 . Respectively at 25°C, 80°C, and 90°C, dissolve half of the maximum amount of sulfur dissolved at each temperature, and conduct a sulfur dissolution time experiment. The results are shown in the attached figure 2 .

[0041] Experimental method and steps:

[0042] The experiment was carried out at atmospheric pressure and at a certain temperature. Sublimed sulfur (chemically pure) powder with a mass of M0 was added to a sulfur-...

Embodiment 2

[0044] At room temperature (about 25°C), take 25 parts of the main agent (DMDS) and add it to the reaction vessel, then add 10 parts of the auxiliary solvent (DMSO), stir evenly, then add 0.125 parts of catalyst sodium bisulfate, continue stirring evenly, without adding Catalyst, add 0.25 part of phase transfer catalyst tetrabutylammonium chloride, stir evenly to obtain sulfur dissolving agent, carry out dissolving and sublimation sulfur powder experiments at 25°C, 80°C, and 90°C respectively, the results are shown in the attached image 3 . Respectively at 25°C, 80°C, and 90°C, dissolve half of the maximum amount of sulfur dissolved at each temperature, and conduct a sulfur dissolution time experiment. The results are shown in the attached Figure 4 .

[0045] Experimental method and step are identical with embodiment one;

Embodiment 3

[0047] At room temperature (about 25°C), take 25 parts of the main agent (DMDS) and add it to the reaction vessel, then add 10 parts of the auxiliary solvent (DMSO), stir evenly, then add 0.125 parts of the catalyst sodium bisulfate, continue stirring evenly, and add the co-catalyst 0.25 parts of naphthalene, continue to stir, then add 0.25 parts of phase transfer catalyst tetrabutylammonium chloride, stir evenly to obtain a sulfur dissolving agent, and carry out experiments on dissolving sublimated sulfur powder at 25°C, 80°C, and 90°C respectively. Figure 5 . Respectively at 25°C, 80°C, and 90°C, dissolve half of the maximum amount of sulfur dissolved at each temperature, and conduct a sulfur dissolution time experiment. The results are shown in the attached Figure 6 .

[0048] Experimental method and step are identical with embodiment one;

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Abstract

The invention discloses a novel high performance dissolving sulfur agent and a preparing method thereof. The novel high performance sulfur dissolving agent is prepared by co-catalyst with an aromatic structure and a phase transfer catalyst of organic amine according to certain proportion through taking dimethyl disulfide (DMDS) as a main solvent, dimethylsulfoxide (DMSO) as an auxiliary solvent, and organic alkali as a catalyst, due to addition of the co-catalyst and the phase transfer catalyst, the sulfur solubility and sulfur dissolving speed of the system are greatly improved, the sulfur dissolving agent has characteristics of high sulfur solubility and sulfur dissolving speed, and has the advantages of greatly reducing the sulfur solubility while reducing the cost compared with the existing DMDS sulfur dissolving agent.

Description

technical field [0001] The invention belongs to the technical field of chemical agents for oil and gas fields, and specifically relates to a sulfur-dissolving agent suitable for high-sulfur gas fields and a preparation method thereof. Background technique [0002] A harmful substance—elemental sulfur—may appear during the development of high-sulfur gas reservoirs. As the gas well starts to produce, the pressure and temperature of the formation continue to drop. When the sulfur content in the gas flow reaches or exceeds the sulfur saturation, elemental sulfur will condense and deposit from the gas flow in the form of sulfur crystals. In this way, elemental sulfur is easy to deposit in production layers, well bores and gathering and transportation systems, causing sulfur plugging and directly affecting the production of gas wells. Sulfur deposition in such high-sulfur gas reservoirs is an urgent problem to be solved, and the development of efficient and reasonable sulfur-diss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/532
CPCC09K8/532C09K2208/20
Inventor 毛金成杨小江李勇明赵金洲
Owner SOUTHWEST PETROLEUM UNIV
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