Low temperature oil well desulfurizer and method of synthesis thereof

Abstract

The application belongs to the technical field of oil exploitation, and particularly relates to a low-temperature oil well desulfurizer and a synthesis method thereof. The method comprises a reductive amination reaction of 1-methylpiperazine-3-ketone and 1-amino-4-(2-hydroxyethyl)piperazine under the action of a catalyst and in the presence of a weakly acidic organic solvent. Based on 1 mol of 1-methylpiperazine-3-ketone, the amount of 1-amino-4-(2-hydroxyethyl)piperazine is 0.8-1.2 mol. The desulfurizer has the characteristics of wide raw material sources, simple synthesis process, clean process and no pollution. Meanwhile, the desulfurizer has the characteristics of good desulfurization effect, rapid desulfurization and high sulfur capacity, and the sulfur capacity is more than 30%.

Description

Technical Field

[0001] This invention belongs to the field of petroleum extraction technology, specifically relating to a low-temperature oil well desulfurizing agent and its synthesis method. Background Technology

[0002] Hydrogen sulfide is a fundamental component of crude oil, significantly impacting its extraction, transportation, and application. For example, it is produced through microbial decomposition of crude oil underground, and organic sulfur in crude oil also generates hydrogen sulfide after high-temperature or hydrothermal cracking. Crude oil contains small amounts of water during extraction; dissolved hydrogen sulfide in this water can corrode steel, shorten the lifespan of pipelines and storage tanks, and even cause pipeline leaks. Furthermore, the release of hydrogen sulfide during transportation poses dangers to workers and can poison catalysts in subsequent crude oil processing units. Therefore, it is essential that hydrogen sulfide in crude oil be removed to safe concentrations before storage and transportation.

[0003] The conventional method for removing hydrogen sulfide from crude oil is deep flash evaporation. However, after deep flash evaporation, 100-150 mg / L of dissolved hydrogen sulfide remains in the crude oil, failing to achieve complete removal. Therefore, it is essential to utilize effective chemical hydrogen sulfide removal agents to thoroughly eliminate dissolved hydrogen sulfide from crude oil. Research and comparative analysis of chemical hydrogen sulfide removal agents for crude oil have revealed that water-soluble hydrogen sulfide removal agents are the most effective. Crude oil exists in different states at different stages of the oilfield system, thus requiring different hydrogen sulfide removal agents. Dehydrated crude oil requires a total water content of less than 0.5%, and typically, a water content below this value leaves approximately 0.2% of the reagent available for dissolution. This necessitates that the chemical hydrogen sulfide removal agent have a high desulfurization capacity, excellent penetration-enhancing and miscibility properties, and a rapid and complete reaction.

[0004] CN 107459998 A A mixed triazine-based crude oil desulfurizer. This invention belongs to the field of crude oil desulfurization technology in the petroleum industry. A mixed triazine-based crude oil desulfurizer uses water as a solvent, and the mass concentrations of the solutes in the solution are as follows: 1,3,5-tris(hydroxyethyl)-hexahydrotriazine 5%–80%, 1,3-hydroxyethyl-5-aminoethyl-triazine 5%–80%, 1,3-hydroxyethyl-5-methyl-triazine 5%–80%, 1-hydroxyethyl-3,5-di(methyl)-triazine 5%–80%, and 1,3,5-tri(methyl)-hexahydrotriazine 5%–80%. Preparation method of mixed triazine-based hydrogen sulfide removal agent: Under the conditions of 25℃~60℃ and stirring speed ≤100 (r / min), the various solutes mentioned above are added to 1000g of water separately or simultaneously, regardless of the order. This invention has the characteristics of simple preparation process, high desulfurization activity and large sulfur capacity of the working solution, instantaneous desulfurization, irreversible desulfurization reaction, strong adaptability, and wide application spectrum. However, the triazine in this invention has poor water solubility. Currently, both domestically and internationally, various co-solvents are commonly added to improve its water solubility. Conventional co-solvents include small molecule alcohols and ethers. However, the addition of these co-solvents affects the sulfur capacity of the desulfurizing agent and also reduces the absorption rate of hydrogen sulfide from oil and gas.

[0005] CN 105056710 B discloses a liquid absorbent for removing hydrogen sulfide from oil and gas. It comprises two types of substances: hexahydrotriazine compounds and oxazolidine compounds. Both have hydrogen sulfide absorption properties, and when mixed in a certain proportion, they not only present a homogeneous phase but also exhibit excellent water solubility, resulting in improved absorption rate and efficiency compared to existing products. Applying this hydrogen sulfide absorbent can reduce the corrosion of metal equipment and pipelines by hydrogen sulfide, protect workers from the harmful effects of hydrogen sulfide gas, and prevent atmospheric pollution. However, the oxazolidine synthesis method in this patent is difficult to control in practice. The synthesized product is a mixture of oxazolidine and byproducts, resulting in poor reproducibility. Furthermore, the synthesis process poses safety hazards, making it difficult to industrialize this technology.

[0006] CN109593545A discloses a compound desulfurizing agent suitable for high-oil-content oil wells and its preparation method. The desulfurizing agent consists of 20-27.5% formaldehyde, 20-27.5% ethanolamine, 2-7% surfactant, 1-5% small-molecule alcohol, and the balance water. This desulfurizing agent has low viscosity, sufficient contact with crude oil, good miscibility, high antifreeze performance, short reaction time, and is easy to prepare. The desulfurizing agent achieves its effect through the reaction of the reaction product of aldehyde and ethanolamine compounds with hydrogen sulfide. The surfactant has an emulsifying effect, ensuring good miscibility between crude oil and the desulfurizing agent. The small-molecule alcohol acts as an antifreeze, allowing the desulfurizing agent to remain usable in sub-zero environments. The desulfurization efficiency is above 98%, and the reaction product is easy to process, preventing the formation of ferrous sulfide deposition and not affecting normal oil production operations. However, the desulfurization principle of this patent is simply the absorption of hydrogen sulfide by ethanolamine, resulting in a single mechanism and limited desulfurization effect. Summary of the Invention

[0007] This invention addresses the shortcomings of the prior art by providing a low-temperature oil well desulfurizing agent and its synthesis method. The desulfurizing agent of this invention features a wide range of raw material sources, a simple synthesis process, and a clean and pollution-free process. Simultaneously, the desulfurizing agent exhibits excellent desulfurization effect, rapid desulfurization, and high sulfur capacity, reaching over 30%.

[0008] Therefore, in order to achieve the above objectives, on the one hand, the present invention discloses a low-temperature oil well desulfurizing agent, the molecular structural formula of which is as follows:

[0009]

[0010] On the other hand, the present invention provides a method for synthesizing a low-temperature oil well desulfurizer, the method comprising: under the action of a catalyst and in the presence of a weakly acidic organic solvent, a reductive amination reaction of 1-methylpiperazin-3-one and 1-amino-4-(2-hydroxyethyl)piperazine.

[0011] The third objective of this invention is to disclose the application of the above-mentioned desulfurizing agent in the desulfurization of oil wells with high hydrogen sulfide content.

[0012] The low-temperature oil well desulfurizer of this invention belongs to the polyazine class of desulfurizers, and its desulfurization principle is as follows:

[0013] (1) The aqueous solution of the present invention is alkaline and has a certain adsorption effect on hydrogen sulfide;

[0014] (2) The four nitrogen atoms in the azirium ring of the molecule can undergo a substitution reaction with sulfur to completely remove hydrogen sulfide;

[0015] (3) The amine-containing compounds generated after the nitrogen atom substitution reaction on the azine ring also have desulfurization capabilities;

[0016] (4) The molecules of this invention contain multiple tertiary amines and secondary amines, which are weakly basic and can be adsorbed with hydrogen sulfide.

[0017] (5) This invention pertains to polar molecules and, based on the principle of like dissolves like, has a certain dissolving effect on the polar molecule hydrogen sulfide.

[0018] (6) The molecules of this invention are linear and have less steric hindrance in absorbing hydrogen sulfide.

[0019] The beneficial effects and advantages of this invention compared with the prior art are as follows:

[0020] (1) The low-temperature oil well desulfurizer of the present invention has the characteristics of wide availability of raw materials, simple synthesis process, and clean and pollution-free process;

[0021] (2) The low-temperature oil well desulfurizer of the present invention has the characteristics of good desulfurization effect, fast desulfurization and high sulfur capacity, with a sulfur capacity of more than 30%. Detailed Implementation

[0022] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0023] According to a first aspect of the present invention, a low-temperature oil well desulfurizing agent is disclosed, the molecular structural formula of which is as follows:

[0024]

[0025] Secondly, the present invention provides a method for synthesizing a low-temperature oil well desulfurizer, the method comprising: under the action of a catalyst and in the presence of a weakly acidic organic solvent, a reductive amination reaction of 1-methylpiperazin-3-one and 1-amino-4-(2-hydroxyethyl)piperazine.

[0026] In this invention, preferably, the amount of 1-amino-4-(2-hydroxyethyl)piperazine is 0.8-1.2 moles based on 1 mole of 1-methylpiperazin-3-one.

[0027] More preferably, the amount of 1-amino-4-(2-hydroxyethyl)piperazine is 0.9-1.1 based on 1 mole of 1-methylpiperazin-3-one.

[0028] In this invention, preferably, the reducing amination reaction temperature is room temperature to 60°C and the time is 60 to 120 minutes.

[0029] More preferably, the reductive amination reaction comprises two sequential stages: the first stage is carried out at room temperature for 30-60 min; the second stage is carried out at 50-60°C for 30-60 min.

[0030] In this invention, preferably, the catalyst is one of sodium borocyanide, sodium cyanoborohydride, and sodium triacetate borocyanide.

[0031] More preferably, the catalyst is sodium cyanoborohydride or sodium triacetate borohydride.

[0032] In this invention, preferably, the amount of catalyst used is 0.9-1.3 moles based on 1 mole of 1-methylpiperazin-3-one.

[0033] More preferably, the amount of the catalyst is 1-1.2 moles based on 1 mole of 1-methylpiperazin-3-one.

[0034] In this invention, preferably, the weak acidity refers to pH 3-4.

[0035] In this invention, preferably, the organic solvent is one of isopropanol, ethanol, and methanol.

[0036] According to a more specific preferred embodiment, the synthesis method of the low-temperature oil well desulfurizer comprises the following steps:

[0037] (1) Add 1-methylpiperazin-3-one, organic solvent and catalyst in sequence to the reactor in a four-necked flask, and adjust the pH to 3-4 with hydrochloric acid;

[0038] (2) Dissolve 1-amino-4-(2-hydroxyethyl)piperazine in the same weight of organic solvent as in step (1), place it in a dropping funnel, and slowly add it dropwise into a four-necked flask while stirring. After the addition is complete, continue the reaction for 30-60 min, heat to 50-60℃, and react for 30-60 min.

[0039] (3) Distill the above mixture under reduced pressure to 60°C until no distillate is obtained, add hydrochloric acid, filter, cool the filtrate to below 5°C, precipitate solid, filter, dissolve the solid with sodium hydroxide, control the pH of the solution at 8-9, and obtain the product desulfurizer.

[0040] In a preferred embodiment, the weight ratio of the organic solvent to 1-methylpiperazin-3-one in step (1) is 4-6:1.

[0041] In a preferred embodiment, the amount of hydrochloric acid used in step (3) is 1.9-2.1 moles based on 1 mole of 1-methylpiperazin-3-one.

[0042] The reaction equation for the synthesis of the low-temperature oil well desulfurizer described in this invention is as follows:

[0043]

[0044] The third objective of this invention discloses the application of the aforementioned desulfurizing agent in desulfurization of oil wells with high hydrogen sulfide content. No particular requirements are placed on the specific application; conventional applications in the field are acceptable and will not be elaborated upon further here.

[0045] More preferably, the hydrogen sulfide content of the high-hydrogen sulfide oil well is less than 100,000 mg / m³. 3 The oil well temperature is below 80℃.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0047] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

[0048] The present invention will be further described below with reference to specific embodiments.

[0049] In this invention, all the devices or equipment used are conventional devices or equipment known in the art and are readily available.

[0050] Unless otherwise specified, all reagents used in the following examples and comparative examples are commercially available chemically pure reagents.

[0051] Example 1

[0052] (1) Add 0.1 mol 1-methylpiperazin-3-one, 45.6 g isopropanol and 0.09 mol sodium borohydride to the reactor in a four-necked flask in sequence, and adjust the pH to 3-4 with 1 mol / L hydrochloric acid;

[0053] (2) Dissolve 0.12 mol of 1-amino-4-(2-hydroxyethyl)piperazine in 45.6 g of isopropanol, place it in a dropping funnel, and slowly add it dropwise into a four-necked flask while stirring. After the addition is complete, react for 30 min, heat to 60 °C, and react for 40 min.

[0054] (3) Distill the above mixture under reduced pressure until there is no distillate at 60°C, add 0.19 mol / L hydrochloric acid, filter, cool the filtrate to below 5°C, precipitate solid, filter, dissolve the solid with 2 mol / L sodium hydroxide, and control the pH of the dissolution at 8-9 to obtain the product low temperature oil well desulfurizer.

[0055] Example 2

[0056] (1) Add 0.1 mol 1-methylpiperazin-3-one, 52.8 g ethanol and 0.13 mol sodium cyanoborohydride to the reactor in a four-necked flask in sequence, and adjust the pH to 3-4 with 1 mol / L hydrochloric acid;

[0057] (2) Dissolve 0.08 mol of 1-amino-4-(2-hydroxyethyl)piperazine in 52.8 g of ethanol, place it in a dropping funnel, and slowly add it dropwise into a four-necked flask while stirring. After the addition is complete, react for 40 min, heat to 50 °C, and react for another 40 min.

[0058] (3) Distill the above mixture under reduced pressure until there is no distillate at 60°C, add 0.21 mol / L hydrochloric acid, filter, cool the filtrate to below 5°C, precipitate solid, filter, dissolve the solid with 2 mol / L sodium hydroxide, and control the pH of the dissolution at 8-9 to obtain the product low temperature oil well desulfurizer.

[0059] Example 3

[0060] (1) Add 0.1 mol 1-methylpiperazin-3-one, 68.4 g isopropanol and 0.1 mol sodium triacetate borohydride to the reactor in a four-necked flask in sequence, and adjust the pH to 3-4 with 1 mol / L hydrochloric acid;

[0061] (2) Dissolve 0.09 mol of 1-amino-4-(2-hydroxyethyl)piperazine in 68.4 g of isopropanol, place it in a dropping funnel, and slowly add it dropwise into a four-necked flask while stirring. After the addition is complete, react for 60 min, heat to 55 °C, and react for 40 min.

[0062] (3) Distill the above mixture under reduced pressure until there is no distillate at 60°C, add 0.2 mol / L hydrochloric acid, filter, cool the filtrate to below 5°C, precipitate solid, filter, dissolve the solid with 2 mol / L sodium hydroxide, and control the pH of the dissolution at 8-9 to obtain the product low temperature oil well desulfurizer.

[0063] Example 4

[0064] (1) Add 0.1 mol 1-methylpiperazin-3-one, 53.6 g methanol and 0.12 mol sodium borohydride to the reactor in a four-necked flask in sequence, and adjust the pH to 3-4 with 1 mol / L hydrochloric acid;

[0065] (2) Dissolve 0.1 mol of 1-amino-4-(2-hydroxyethyl)piperazine in 53.6 g of methanol, place it in a dropping funnel, and slowly add it dropwise into a four-necked flask while stirring. After the addition is complete, react for 30 min, heat to 60 °C, and react for 60 min.

[0066] (3) Distill the above mixture under reduced pressure until there is no distillate at 60°C, add 0.205 mol / L hydrochloric acid, filter, cool the filtrate to below 5°C, precipitate solid, filter, dissolve the solid with 2 mol / L sodium hydroxide, and control the pH of the dissolution at 8-9 to obtain the product low temperature oil well desulfurizer.

[0067] Example 5

[0068] (1) Add 0.1 mol 1-methylpiperazin-3-one, 54.8 g ethanol and 0.11 mol sodium cyanoborohydride to the reactor in a four-necked flask in sequence, and adjust the pH to 3-4 with 1 mol / L hydrochloric acid;

[0069] (2) Dissolve 0.11 mol of 1-amino-4-(2-hydroxyethyl)piperazine in 54.8 g of ethanol, place it in a dropping funnel, and slowly add it dropwise into a four-necked flask while stirring. After the addition is complete, react for 50 min, heat to 52 °C, and react for 30 min.

[0070] (3) Distill the above mixture under reduced pressure until there is no distillate at 60°C, add 0.2 mol / L hydrochloric acid, filter, cool the filtrate to below 5°C, precipitate solid, filter, dissolve the solid with 2 mol / L sodium hydroxide, and control the pH of the dissolution at 8-9 to obtain the product low temperature oil well desulfurizer.

[0071] Example 6

[0072] (1) Add 0.1 mol 1-methylpiperazin-3-one, 62.4 g methanol and 0.11 mol sodium triacetate borohydride to the reactor in a four-necked flask in sequence, and adjust the pH to 3-4 with 1 mol / L hydrochloric acid;

[0073] (2) Dissolve 0.1 mol of 1-amino-4-(2-hydroxyethyl)piperazine in 62.4 g of methanol, place it in a dropping funnel, and slowly add it dropwise into a four-necked flask while stirring. After the addition is complete, react for 40 min, heat to 58 °C, and react for 45 min.

[0074] (3) Distill the above mixture under reduced pressure until there is no distillate at 60°C, add 0.195 mol / L hydrochloric acid, filter, cool the filtrate to below 5°C, precipitate solid, filter, dissolve the solid with 2 mol / L sodium hydroxide, and control the pH of the dissolution at 8-9 to obtain the product low temperature oil well desulfurizer.

[0075] Example 7: Sulfur Capacity Test

[0076] Sulfur capacity is one of the most important indicators for evaluating the performance of desulfurizers. The sulfur capacity of the present invention was tested according to the following steps. Triazine desulfurizer from Dongying Jiushicheng Petroleum Technology Co., Ltd. was used as comparative example 1, and triazine desulfurizer from Shengli Oilfield Jindao Petroleum Engineering Technology Co., Ltd. was used as comparative example 2. The test results are shown in Table 1.

[0077] (1) Absorption of hydrogen sulfide

[0078] Connect the apparatus within a fume hood. Weigh 10g of the desulfurizing agent to be tested and add it to the hydrogen sulfide absorption reaction bottle. Add 400g of distilled water and place the sintered filter element in the bottle, positioning it approximately 3-5mm from the bottom. Connect the filter element to the outlet of the hydrogen sulfide cylinder via a pipeline, ensuring it is completely immersed in the liquid and that the top of the filter element is at least 15mm below the surface of the diluted desulfurizing agent solution. Place a rubber stopper at the top of the absorption tube, leaving a gas outlet, which is then connected sequentially to silver nitrate solution and sodium hydroxide solution. The mass of the hydrogen sulfide absorption reaction bottle and the sintered filter element is recorded as m0.

[0079] Place the hydrogen sulfide absorption reaction bottle in a constant temperature water bath at 60℃±1℃, ensuring the water level is at least 20mm higher than the desulfurizing agent dilution level. After maintaining the constant temperature for at least 15 minutes, begin injecting hydrogen sulfide or hydrogen sulfide gas balanced with an inert gas into the absorption tube. Control the gas injection rate using a flow meter to ensure it does not exceed 20mL / min. Weigh the hydrogen sulfide absorption reaction bottle (including desulfurizing agent, distilled water, and filter cartridge) every 30 minutes until the mass of the absorption reaction bottle stops increasing; record this as m1.

[0080] At the same time, the masses of the absorption reaction bottle (including distilled water and filter element) before and after the reaction were measured when no desulfurizing agent was added and only 400g of distilled water was added, n0 and n1.

[0081] (2) Calculation of sulfur capacity

[0082] The sulfur capacity is calculated according to formula (1):

[0083]

[0084] In the formula:

[0085] X — sulfur capacity of the desulfurizing agent, %;

[0086] m0—Weight of the absorption reaction bottle before the experiment (including desulfurizer, distilled water and filter element), g;

[0087] m1—Mass of the absorption reaction bottle after the experiment (including desulfurizing agent, distilled water, and filter element), g;

[0088] m—mass of the desulfurizing agent to be tested, in grams;

[0089] n0—mass of the absorption reaction flask before the experiment (including distilled water and filter cartridge), g;

[0090] n1 — Mass of the absorption reaction flask after the experiment (including distilled water and filter cartridge), g.

[0091] Table 1. Results of sulfur capacity test for desulfurizing agent

[0092] desulfurizer Sulfur capacity R, % Example 1 31.3 Example 2 34.6 Example 3 35.3 Example 4 33.3 Example 5 36.8 Example 6 38.9 Comparative Example 1 20.2 Comparative Example 2 23.1

[0093] As can be seen from Table 1, the sulfur capacity R of the low-temperature oil well desulfurizer of the present invention (Examples 1-6) is greater than 30%, reaching a maximum of 38.9% (Example 6). In contrast, the sulfur capacity R of the triazine desulfurizer of Comparative Example 1 Dongying Jiushicheng Petroleum Technology Co., Ltd. and the triazine desulfurizer of Comparative Example 2 Shengli Oilfield Jindao Petroleum Engineering Technology Co., Ltd. are 20.2% and 23.1% respectively, which are significantly lower than that of the desulfurizer of the present invention.

[0094] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for synthesizing a low-temperature oil well desulfurizing agent, characterized in that, The synthesis method includes: under the action of a catalyst and in the presence of a weakly acidic organic solvent, 1-methylpiperazin-3-one and 1-amino-4-(2-hydroxyethyl)piperazine undergo a reductive amination reaction to obtain a desulfurizing agent; Based on 1 mole of 1-methylpiperazin-3-one, the amount of 1-amino-4-(2-hydroxyethyl)piperazine used is 0.8-1.2 moles; The catalyst is one of sodium borocyanide, sodium cyanoborohydride, and sodium triacetate borocyanide; The molecular structure of the desulfurizing agent is as follows: 。 2. The method for synthesizing a low-temperature oil well desulfurizing agent as described in claim 1, characterized in that, Based on 1 mole of 1-methylpiperazin-3-one, the amount of 1-amino-4-(2-hydroxyethyl)piperazine is 0.9-1.1 moles.

3. The method for synthesizing a low-temperature oil well desulfurizing agent as described in claim 1, characterized in that, The reductive amination reaction was carried out at a temperature of room temperature to 60°C for a time of 60-120 minutes.

4. The method for synthesizing a low-temperature oil well desulfurizing agent as described in claim 3, characterized in that, The reductive amination reaction comprises two sequential stages: the first stage is carried out at room temperature for 30-60 minutes; the second stage is carried out at 50-60°C for 30-60 minutes.

5. The method for synthesizing a low-temperature oil well desulfurizer as described in claim 1, characterized in that, The catalyst is sodium cyanoborohydride or sodium triacetate borohydride.

6. The method for synthesizing a low-temperature oil well desulfurizing agent as described in claim 1 or 5, characterized in that, The amount of catalyst used is 0.9-1.3 moles based on 1 mole of 1-methylpiperazin-3-one.

7. The method for synthesizing a low-temperature oil well desulfurizing agent as described in claim 6, characterized in that, The amount of catalyst used is 1-1.2 moles based on 1 mole of 1-methylpiperazin-3-one.

8. The method for synthesizing a low-temperature oil well desulfurizing agent as described in claim 1, characterized in that, The term "weakly acidic" refers to pH 3-4.

9. The method for synthesizing a low-temperature oil well desulfurizing agent as described in claim 1, characterized in that, The organic solvent is one of isopropanol, ethanol, and methanol.

10. A low-temperature oil well desulfurizing agent obtained by the synthesis method according to claim 1, characterized in that, The molecular structure of the desulfurizing agent is as follows: 。 11. The application of the low-temperature oil well desulfurizing agent as described in claim 10 in the desulfurization of oil wells with high hydrogen sulfide content.

12. The application of the low-temperature oil well desulfurizing agent as described in claim 11 in the desulfurization of oil wells with high hydrogen sulfide content, characterized in that, The oil well temperature for this application is below 80°C.

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