A sulfur solvent, its preparation method and application

Abstract

This invention relates to a sulfur dissolving agent, its preparation method, and its application, belonging to the field of oil and gas field chemicals technology. The sulfur dissolving agent of this invention is a high-efficiency sulfur dissolving agent for oil-water mixed phases with low density, long wellbore residence time, and rapid sulfur dissolution. The main function of the sulfur dissolving agent is to dissolve deposited sulfur; the foaming agent contains strongly polar functional groups such as hydroxyl and amino groups, which can be tightly oriented around the hydrophilic groups of the active agent molecules in the microbubble core, and, in conjunction with the foam stabilizer, can provide a densely structured coating for the microbubble core, thus protecting it; the foaming agent and foam stabilizer impart a low density to the sulfur dissolving agent. Due to its low density, the sulfur dissolving agent of this invention can reduce the amount of the main sulfur dissolving agent used, thereby reducing raw material costs. Using polyethylene polyamine and / or the compound shown in Formula I as the main sulfur dissolving agent can give the sulfur dissolving agent a lower odor and also protect the gas core and enhance the temperature resistance of the microbubbles.

Description

Technical Field

[0001] This invention relates to a sulfur solvent, its preparation method, and its application, belonging to the field of oil and gas field chemicals technology. Background Technology

[0002] As the development of the Puguang Gas Field enters the middle and late stages, the formation pressure gradually decreases, and the problem of sulfur deposition and blockage becomes increasingly prominent. At present, the sulfur deposition and blockage in the wellbore is intensifying year by year, and the deposition rate is accelerating. Gas production, oil temperature and oil pressure are significantly reduced, affecting the daily gas production of a single well by 100,000 to 200,000 cubic meters, and even causing production stoppage, which seriously affects the production capacity of gas wells.

[0003] Existing sulfur solvents are broadly classified into two categories: physical solvents and chemical solvents. Physical solvents do not undergo a chemical reaction when dissolving sulfur, resulting in low sulfur dissolution rates, and are rarely used currently. Patent literature reports include CS2, light mineral oils or liquid hydrocarbons, paraffinic mineral oils, benzene, cycloalkanes or petroleum fractions, and mixtures of alkylnaphthalenes. Chemical solvents undergo a chemical reaction when dissolving sulfur, primarily including disulfides, organic amines, and inorganic bases.

[0004] Chinese patent document CN105154047A discloses a sulfur solvent using dimethyl disulfide (DMDS) as the main agent, dimethyl sulfoxide (DMSO) as the co-solvent, and an inorganic base as the catalyst. This type of sulfur solvent has good sulfur-dissolving effect; however, DMDS and DMSO are highly toxic and have a strong pungent odor, which no longer meets safety and environmental protection requirements and is gradually being phased out.

[0005] Chinese patent document CN104140800B discloses an amine-based sulfur solvent composed of a formamide-based physical sulfur solvent and a polyethylenepolyamine-based chemical sulfur solvent. This sulfur solvent combines the advantages of both physical and chemical sulfur solvents, has a simple preparation method, and is characterized by being non-irritating, odorless, and low in toxicity, while also exhibiting low corrosivity to metals and polymer materials. However, the cost of the amine compound used as the main agent is too high, making it unsuitable for widespread application.

[0006] Chinese patent document CN102408886A discloses a highly efficient, odorless sulfur solvent, composed of sodium hydroxide aqueous solution, sulfolane, N-methylpyrrolidone, and N,N-dimethylformamide, belonging to the inorganic alkali sulfur solvent class. Although this type of inorganic alkali sulfur solvent is odorless, the aqueous solution of sodium hydroxide, an inorganic alkali, is highly alkaline and corrosive to metals and polymer materials.

[0007] Existing sulfur solvents all possess some sulfur-dissolving effect, but they are all conventional density solvents. With the gradual development of the Puguang gas field, formation pressure has been decreasing year by year. Compared to the current reservoir pressure coefficient (0.4–0.7), the density of existing sulfur solvents is generally too high (the density of organic amine sulfur solvents is 0.9–1.0 g / cm³). 3Between these, the density of inorganic alkaline sulfur solvents is greater than 1.2 g / cm³. 3 This will result in a low liquid column length of the sulfur dissolving agent in the wellbore and difficulty in backflow. The current sulfur dissolving agent system is unable to meet the requirements of sulfur dissolution under low hydrostatic pressure. Furthermore, the existing sulfur dissolving agent system will cause leakage and irreversible damage to the reservoir due to its high density. Summary of the Invention

[0008] The purpose of this invention is to provide a sulfur solvent that can solve the problem that current sulfur solvent systems are unable to meet the requirements for sulfur dissolution under low hydrostatic column pressure.

[0009] The second objective of this invention is to provide a method for preparing a sulfur solvent.

[0010] The third objective of this invention is to provide a sulfur-dissolving agent for use as a cleaning agent in surface gathering and transportation systems for sulfur-containing gas fields.

[0011] To achieve the above objectives, the technical solution adopted by the sulfur solvent of the present invention is as follows:

[0012] A sulfur-dissolving agent mainly comprises water, a sulfur-dissolving agent, a foaming agent, a foaming agent, and a foam stabilizer; the sulfur-dissolving agent is a polyethylene polyamine and / or a compound of formula I; the foaming agent is composed of amines and alcohols, wherein the amines are selected from one or any combination of compounds of formula II, formula III, and formula IV, and the alcohols are compounds of formula V; the mass ratio of the sulfur-dissolving agent, foaming agent, foaming agent, and foam stabilizer is (50–75):(0.5–5.5):(0.2–3):(0.5–5);

[0013]

[0014] In Formula I, R1 and R2 are each independently selected from hydroxyl-substituted C1-C5 alkyl groups, and R3 is a hydrogen- or hydroxyl-substituted C1-C5 alkyl group.

[0015] In Formula II, R4 is a hydroxyl-substituted C1-C5 alkyl group, and R5 is an amino-substituted C1-C5 alkyl group;

[0016] In Formula III, R6 is a C2-C6 alkylene group;

[0017] In Formula IV, R7 and R8 are each independently selected from hydroxyl-substituted C1-C5 alkyl groups, and R9 is a C1-C5 alkyl group;

[0018] In formula V, R 10 C4-C 12 alkyl.

[0019] The sulfur dissolving agent of this invention is a high-efficiency oil-water mixed-phase sulfur dissolving agent with low density, capable of forming a long liquid column in the wellbore and rapidly dissolving sulfur. The main function of the sulfur dissolving agent is to dissolve deposited sulfur. The foaming agent contains strongly polar functional groups such as hydroxyl (-OH) and amino (-NH2), which can be tightly oriented around the hydrophilic groups of the active agent molecules in the microbubble core. Combined with a foam stabilizer, it provides a dense coating layer for the microbubble core, protecting it and enhancing its resistance to high temperatures and acidic gases, thus improving the sulfur dissolving agent's high-temperature resistance and hydrogen sulfide resistance. The foaming agent and foam stabilizer impart a lower density to the sulfur dissolving agent. By adjusting the dosage of the foaming agent and foam stabilizer, the sulfur dissolving agent can have different densities, making it suitable for wellbore sulfur dissolution and unblocking operations with varying density requirements. Due to its lower density, the sulfur dissolving agent of this invention can reduce the dosage of the main sulfur dissolving agent, thereby reducing raw material costs. Using polyethylene polyamines and / or compounds of Formula I as the main sulfur-dissolving agents not only gives the sulfur-dissolving agent a milder odor but also protects the gas nuclei and enhances the microbubble's resistance to temperature and acidic gases. Polyethylene polyamines and / or compounds of Formula I combine the advantages of both physical and chemical sulfur-dissolving agents, exhibiting the benefits of being non-irritating, odorless, and low in toxicity. Furthermore, they have minimal corrosiveness to metals and polymer materials, facilitating application.

[0020] Preferably, the polyethylene polyamine is diethylenetriamine and / or triethylenetetramine.

[0021] Preferably, in Formula I, R1 and R2 are each independently selected from hydroxylated methyl, hydroxylated ethyl, or hydroxylated propyl, and R3 is hydrogen, hydroxylated methyl, hydroxylated ethyl, or hydroxylated propyl. For example, the compound shown in Formula I is diethanolamine or triethanolamine.

[0022] Preferably, in Formula II, R4 is a hydroxylated methyl, a hydroxylated ethyl, or a hydroxylated propyl, and R5 is an amino-substituted methyl, an amino-substituted ethyl, or an amino-substituted propyl. For example, the compound represented by Formula II is a diethylene glycolamine.

[0023] Preferably, in Formula III, R6 is ethylidene or propyleneide. For example, the compound represented by Formula III is ethylenediamine or propylenediamine.

[0024] Preferably, in Formula IV, R7 and R8 are each independently selected from hydroxylated methyl, hydroxylated ethyl, or hydroxylated propyl; R9 is methyl, ethyl, or propyl. For example, the compound represented by Formula IV is N-methyldiethanolamine, N-ethyldiethanolamine, N-propyldiethanolamine, N-methyldipropanolamine, N-ethyldipropanolamine, or N-propyldipropanolamine.

[0025] Preferably, in formula V, R 10 C5-C 12Alkyl group. For example, R 10 The alcohols are n-pentyl, n-octyl, and lauryl. For example, the alcohols are n-octanol, lauryl alcohol, and n-pentanol.

[0026] Preferably, the sulfur-dissolving agent is selected from one or any combination of diethylenetriamine, triethanolamine, diethanolamine, and triethylenetetramine.

[0027] Preferably, the mass ratio of the sulfur dissolving agent, foaming agent, foaming agent and foam stabilizer is (50-75):(1.8-5.5):(0.3-3):(2-5).

[0028] It is understood that the amount of water added can be determined according to the specific application environment. When the sulfur dissolving agent of the present invention is used for desulfurization in the wellbore of oil and gas wells, if there is water in the wellbore, the amount of water added to the sulfur dissolving agent can be appropriately reduced, and if there is no water in the wellbore, the amount of water added to the sulfur dissolving agent can be appropriately increased.

[0029] When the sulfur-dissolving agent of the present invention is used for desulfurization in anhydrous oil and gas wells, preferably, the sulfur-dissolving agent is composed of the following components by mass percentage: 50-75% sulfur-dissolving main agent, 1.8-5.5% foaming agent, 0.3-3% foaming agent, 2-5% foam stabilizer, and the balance being water. By adjusting the formula, the sulfur-dissolving agent of the present invention can achieve a saturated sulfur dissolution capacity of 45 g / 100 mL at 60 °C, and a density of 0.75-0.95 g / cm³. 3 Adjustments can be made within a certain range.

[0030] Preferably, the sulfur-dissolving agent is composed of the following components in parts by mass: 45-55 parts of diethylenetriamine, 0-10 parts of triethanolamine, 0-10 parts of diethanolamine, and 35-45 parts of triethylenetetramine.

[0031] Preferably, the amine is selected from one or any combination of ethylenediamine, diethylene glycolamine, and N-methyldiethanolamine; the alcohol is selected from one or any combination of n-octanol, lauryl alcohol, and n-pentanol.

[0032] Preferably, the amine is composed of ethylenediamine and diethylene glycolamine; the mass ratio of ethylenediamine to diethylene glycolamine is (0.5-2):(0.3-2).

[0033] Preferably, the alcohol is n-octanol.

[0034] Preferably, the mass ratio of the amine to the alcohol is (0.8–4):(0.5–2.5). For example, the mass ratio of the amine to the alcohol is (1.3–4):(0.5–2.5).

[0035] Preferably, the foaming agent is composed of ethylenediamine, diethylene glycolamine and n-octanol, wherein the mass ratio of ethylenediamine, diethylene glycolamine and n-octanol is (0.5-2):(0.3-2):(0.5-2.5).

[0036] Preferably, the density of the sulfur solvent is 0.75–0.95 g / cm³. 3 .

[0037] Preferably, the foaming agent is composed of anionic surfactants and / or nonionic surfactants. Preferably, the anionic surfactant is sodium dodecylbenzenesulfonate and / or triethanolamine dodecyl sulfate. Preferably, the nonionic surfactant is coconut oil diethanolamide. The main function of the foaming agent is to produce foam, thereby imparting a lower density to the sulfur solvent.

[0038] Preferably, the foaming agent is composition A or composition B; composition A consists of sodium dodecylbenzenesulfonate, triethanolamine dodecyl sulfate and coconut oil diethanolamide, and composition B consists of sodium dodecylbenzenesulfonate and triethanolamine dodecyl sulfate.

[0039] Preferably, in composition A, the mass ratio of sodium dodecylbenzenesulfonate, triethanolamine dodecyl sulfate, and coconut oil diethanolamide is (0.1-0.6):(0.1-0.6):(0.1-0.8); and in composition B, the mass ratio of sodium dodecylbenzenesulfonate and triethanolamine dodecyl sulfate is (0.5-2):(0.2-1.5).

[0040] Preferably, the foam stabilizer is composed of xanthan gum, carboxymethyl cellulose, and sodium trimetaphosphate. Preferably, the mass ratio of xanthan gum, carboxymethyl cellulose, and sodium trimetaphosphate is (0.5–2.5):(0.5–3):(0.5–2.5). For example, the mass ratio of xanthan gum, carboxymethyl cellulose, and sodium trimetaphosphate is (0.5–2.5):(0.5–2.5):(0.5–2.5). The main function of the foam stabilizer is to enhance the stability of foam at high temperatures, thereby improving the stability of the sulfur solvent at high temperatures.

[0041] The technical solution adopted in the preparation method of the sulfur solvent of the present invention is as follows:

[0042] The method for preparing the sulfur solvent as described above includes the following steps: taking the formula amount of each component, mixing them evenly, and then obtaining the solvent.

[0043] Preferably, the foaming agent is composed of ethylenediamine, diethylene glycolamine, and n-octanol; the method of uniform mixing includes the following steps: under stirring conditions, ethylenediamine is added to water, then a foam stabilizer is added, and the mixture is stirred until fully dissolved, then diethylene glycolamine and n-octanol are added, mixed evenly, and then a foaming agent and a sulfur dissolving agent are added in sequence, and the mixture is stirred until fully dissolved to obtain the final product.

[0044] Preferably, the stirring speed when adding ethylenediamine, foam stabilizer, diethylene glycolamine, and n-octanol is 2000–4000 r / min. For example, the stirring speed when adding ethylenediamine, foam stabilizer, diethylene glycolamine, and n-octanol is 3000 r / min. Preferably, the stirring speed when adding foaming agent and sulfur dissolving agent is 8000–10000 r / min. For example, the stirring speed when adding foaming agent and sulfur dissolving agent is 9000 r / min.

[0045] The application of the sulfur-dissolving agent of the present invention in dissolving sulfur deposited in the wellbore of oil and gas wells.

[0046] Application of the above-mentioned sulfur dissolving agent in dissolving sulfur deposited in the wellbore of oil and gas wells.

[0047] Preferably, the application includes the following step: injecting the sulfur dissolving agent into the wellbore.

[0048] Preferably, the temperature inside the wellbore is 30–90°C. Detailed Implementation

[0049] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0050] I. Specific embodiments of the sulfur solvent of the present invention are as follows:

[0051] Example 1

[0052] The sulfur dissolving agent in this embodiment is composed of the following components by mass percentage: 50% sulfur dissolving agent, 2.2% foaming agent, 0.3% foaming agent, 2% foam stabilizer, and 45.5% water. The sulfur dissolving agent is composed of the following components by mass percentage: 45 parts diethylenetriamine, 10 parts diethanolamine, and 45 parts triethylenetetramine. The foaming agent is composed of ethylenediamine, diethylene glycolamine, and n-octanol, with a mass ratio of 1:0.6:0.6. The foaming agent is composed of sodium dodecylbenzenesulfonate, triethanolamine dodecyl sulfate, and coconut oil diethanolamide, with a mass ratio of 0.1:0.1:0.1. The foam stabilizer is composed of xanthan gum, carboxymethyl cellulose, and sodium trimetaphosphate, with a mass ratio of 1:0.5:0.5.

[0053] Example 2

[0054] The sulfur dissolving agent in this embodiment is composed of the following components by mass percentage: 50% sulfur dissolving agent, 4% foaming agent, 2% foaming agent, 4% foam stabilizer, and 40% water. The sulfur dissolving agent is composed of the following components by mass percentage: 55 parts diethylenetriamine, 10 parts triethanolamine, and 35 parts triethylenetetramine. The foaming agent is composed of ethylenediamine, diethylene glycolamine, and n-octanol, with a mass ratio of 1.5:0.5:2. The foaming agent is composed of sodium dodecylbenzenesulfonate, triethanolamine dodecyl sulfate, and coconut oil diethanolamide, with a mass ratio of 0.6:0.6:0.8. The foam stabilizer is composed of xanthan gum, carboxymethyl cellulose, and sodium trimetaphosphate, with a mass ratio of 2:1.5:0.5.

[0055] The sulfur dissolving agents in Examples 3-8 consist of a sulfur dissolving agent, a foaming agent, a foaming agent, a foam stabilizer, and water. The sulfur dissolving agent is composed of the following components in parts by mass: 50 parts diethylenetriamine, 5 parts triethanolamine, 5 parts diethanolamine, and 40 parts triethylenetetramine. The foaming agent consists of ethylenediamine, diethylene glycolamine, and n-octanol. The foaming agent consists of sodium dodecylbenzenesulfonate and triethanolamine dodecyl sulfate. The foam stabilizer consists of xanthan gum, carboxymethyl cellulose, and sodium trimetaphosphate. The mass percentages of each raw material in the sulfur dissolving compositions of Examples 3-8 are shown in Table 1.

[0056] Table 1. Mass percentage (%) of each raw material in the sulfur solvents of Examples 3-8

[0057]

[0058]

[0059] Comparative Example 1

[0060] The only difference between the sulfur solvent in this comparative example and the sulfur solvent in Example 1 is that the sulfur solvent in this comparative example has a foaming agent mass fraction of 0% and a water mass fraction of 45.8%.

[0061] Comparative Example 2

[0062] The only difference between the sulfur solvent in this comparative example and the sulfur solvent in Example 1 is that the mass fraction of the foam stabilizer in this comparative example is 0%, and the mass fraction of water is 47.5%.

[0063] Comparative Example 3

[0064] The only difference between the sulfur solvent in this comparative example and the sulfur solvent in Example 1 is that the sulfur solvent in this comparative example has a foaming agent mass fraction of 0% and a water mass fraction of 47.7%.

[0065] II. Specific embodiments of the preparation method of the sulfur solvent of the present invention are as follows:

[0066] The preparation methods of the sulfur solvents in Examples 9-10 are the same as those in Examples 1-2, and specifically include the following steps:

[0067] At a stirring speed of 3000 rpm, add the prescribed amount of ethylenediamine to the prescribed amount of water, then slowly add the prescribed amounts of xanthan gum, carboxymethyl cellulose, and sodium trimetaphosphate in sequence, stirring for 30 minutes until fully dissolved. Then, slowly add the prescribed amounts of diethylene glycolamine and n-octanol in sequence, stirring for 20 minutes until fully dissolved. Then, adjust the stirring speed to 9000 rpm and add the prescribed amounts of sodium dodecylbenzenesulfonate, triethanolamine dodecyl sulfate, coconut oil diethanolamide, and sulfur dissolving agent in sequence, stirring for 20 minutes until fully dissolved and uniform foaming is achieved.

[0068] The methods for preparing the sulfur solvents in Examples 11-16 are the same as those for preparing the sulfur solvents in Examples 3-8, and specifically include the following steps:

[0069] At a stirring speed of 3000 rpm, add the prescribed amount of ethylenediamine to the prescribed amount of water, then slowly add the prescribed amounts of xanthan gum, carboxymethyl cellulose, and sodium trimetaphosphate in sequence, stirring for 30 minutes until fully dissolved. Then, slowly add the prescribed amounts of diethylene glycolamine and n-octanol in sequence, stirring for 20 minutes until fully dissolved. Then, adjust the stirring speed to 9000 rpm and add the prescribed amounts of sodium dodecylbenzenesulfonate, triethanolamine dodecyl sulfate, and sulfur dissolving agent in sequence, stirring for 20 minutes until fully dissolved and uniform foaming is achieved.

[0070] III. Specific embodiments of the application of the sulfur solvent of the present invention in dissolving sulfur deposited in oil and gas wellbores are as follows:

[0071] The sulfur dissolving agents prepared in Examples 1-8 or Examples 9-16 can be injected into the wellbore for dissolution and desulfurization.

[0072] Experimental Example 1

[0073] To evaluate the foaming ability of the sulfur solvents in Examples 1-8 and Comparative Examples 1-3, the sulfur solvents in Examples 1-8 and Comparative Examples 1-3 were stirred and foamed at room temperature, and then the volume of the sulfur solvent after foaming was tested, and the density of the sulfur solvent after foaming was calculated.

[0074] To evaluate the effectiveness of the sulfur dissolving agents in Examples 1-8 and Comparative Examples 1-3 in dissolving sulfur deposited in wellbores, the density and sulfur dissolving effect of the freshly prepared sulfur dissolving agents were tested. The sulfur dissolving effect test method included the following steps: 50g of sublimed sulfur powder was added to 100mL of sulfur dissolving agent at 60℃, stirred evenly, and filtered after 1 hour. The filtered solid was then dried; the dried solid was the undissolved sulfur powder. The mass of the dried solid was then weighed, and the sulfur dissolving effect was evaluated based on the mass of the undissolved sulfur powder. The density and sulfur dissolving effect (mass of undissolved sulfur powder) of the sulfur dissolving agents in Examples 1-8 and Comparative Examples 1-3 are shown in Table 2.

[0075] Table 2 shows the density and sulfur-dissolving effect of the sulfur solvents in Examples 1-8 and Comparative Examples 1-3.

[0076] Sulfur solvent <![CDATA[Density (g / cm 3 )]]> Mass of undissolved sulfur powder (g) Example 1 0.75 5～6 Example 2 0.77 5～6 Example 3 0.8 5 Example 4 0.83 4～5 Example 5 0.88 3～4 Example 6 0.87 3～4 Example 7 0.88 3 Example 8 0.95 1～2 Comparative Example 1 0.98 8～9 Comparative Example 2 0.77 7～8 Comparative Example 3 0.76 7～8

[0077] The results show that the density adjustment range of the low-density sulfur solvent of the present invention is 0.75–0.95 g / cm³. 3 At 60℃, the amount of sulfur dissolved by 100mL of sulfur-dissolving agent in 1 hour is 45-50g. The low-density sulfur-dissolving agent of this invention is simple to prepare, has no odor, can be used to remove sulfur deposition blockage in the wellbore of high-sulfur gas wells, and its density range is adjustable to adapt to reservoirs with different pressures.

[0078] When the foaming agent in Example 1 is replaced with a composition of amines (any one or a combination of ethylenediamine, diethylene glycolamine, and N-methyldiethanolamine) and alcohols (any one or a combination of n-octanol, lauryl alcohol, and n-pentanol), and the mass ratio of amines to alcohols is (0.8–4):(0.5–2.5), the density and sulfur-dissolving effect of the sulfur-dissolving agent obtained by adjusting the formulation are similar to those of the sulfur-dissolving agent in Example 1.

[0079] The amounts of foaming agent, foaming agent and foam stabilizer in Example 1 were adjusted. When the mass ratio of sulfur dissolving agent, foaming agent, foaming agent and foam stabilizer was 50:(0.5~5.5):(0.2~3):(0.5~5), the density and sulfur dissolving effect of the sulfur dissolving agent obtained by adjusting the formula were similar to those of the sulfur dissolving agent in Example 1.

[0080] Experiment Example 2

[0081] To evaluate the stability of the sulfur solvents in Examples 1-8 and Comparative Examples 2-3 after foaming, the sulfur solvents in Examples 1-8 and Comparative Examples 1-3 were stirred evenly and then injected into gas wells (without water). The volume change of the sulfur solvent in the injected gas wells was observed and recorded. The results showed that the sulfur solvents in Examples 1-8 maintained their volume (height) for one week after being injected into the well (well temperature 90°C, well containing 15% hydrogen sulfide by volume). However, the sulfur solvent in Comparative Example 2, after being injected into the well (well temperature 90°C, well containing no hydrogen sulfide), only maintained its volume (height) for 1 hour. After 1 hour, the volume decreased, and the density reached 0.98 g / cm³. 3 In Comparative Example 3, the sulfur dissolving agent, after being injected into a well (well temperature 90℃, well containing 15% hydrogen sulfide by volume), only maintained its volume (height) for 0.5 hours. After 0.5 hours, the volume decreased, and the density reached 0.98 g / cm³. 3 Therefore, the sulfur solvent of the present invention has good foaming stability, high temperature resistance and hydrogen sulfide resistance.

Claims

1. A sulfur solvent agent, characterized by, The application relates to a sulfur-dissolving agent, which is mainly composed of water, a sulfur-dissolving main agent, a bubble film agent, a foaming agent and a bubble stabilizer; the sulfur-dissolving main agent is selected from one or any combination of diethylene triamine, triethanolamine, diethanolamine and triethylene tetramine; the bubble film agent is composed of an amine substance and an alcohol substance, the amine substance is selected from one or any combination of ethylenediamine, diglycolamine and N-methyldiethanolamine, and the alcohol substance is R 10 -OH, R 10 is C4-C 12 alkyl, and the mass ratio of the amine substance and the alcohol substance is (0.8-4):(0.5-2.5); the foaming agent is composed of an anionic surfactant and / or a nonionic surfactant; the anionic surfactant is sodium dodecyl benzene sulfonate and / or triethanolamine dodecyl sulfate, and the nonionic surfactant is coconut oil diethanolamide; the bubble stabilizer is composed of xanthan gum, carboxymethyl cellulose and sodium trimetaphosphate in a mass ratio of (0.5-2.5):(0.5-3):(0.5-2.5); and the mass ratio of the sulfur-dissolving main agent, the bubble film agent, the foaming agent and the bubble stabilizer is (50-75):(0.5-5.5):(0.2-3):(0.5-5).

2. The sulfur solvent according to claim 1, characterized in that, The mass ratio of the sulfur dissolving main agent, the bubble film agent, the foaming agent and the bubble stabilizing agent is (50-75):(1.8-5.5):(0.3-3):(2-5).

3. The sulfur solvent according to claim 1, wherein The sulfur dissolving main agent is composed of the following components in mass fraction: diethylene triamine 45-55 parts, triethanolamine 0-10 parts, diethanolamine 0-10 parts, triethylene tetramine 35-45 parts.

4. The sulfur solvent according to claim 1, wherein The alcohol is selected from one or any combination of n-octanol, lauryl alcohol and n-pentanol.

5. The sulfur solvent according to claim 4, wherein The bubble film agent is composed of ethylenediamine, diglycolamine and n-octanol, and the mass ratio of the ethylenediamine, diglycolamine and n-octanol is (0.5-2):(0.3-2):(0.5-2.5).

6. The sulfur solvent according to claim 1, wherein The sulfur dissolving agent is composed of the following components in mass percentage: sulfur dissolving main agent 50-75%, bubble film agent 1.8-5.5%, foaming agent 0.3-3%, bubble stabilizing agent 2-5%, and the balance is water.

7. The sulfur solvent according to claim 1 or 6, wherein The foaming agent is composition A or composition B; the composition A is composed of sodium dodecyl benzene sulfonate, triethanolamine dodecyl sulfate and coconut oil diethanolamide, and the mass ratio of the sodium dodecyl benzene sulfonate, triethanolamine dodecyl sulfate and coconut oil diethanolamide is (0.1-0.6):(0.1-0.6):(0.1-0.8); the composition B is composed of sodium dodecyl benzene sulfonate and triethanolamine dodecyl sulfate, and the mass ratio of the sodium dodecyl benzene sulfonate and triethanolamine dodecyl sulfate is (0.5-2):(0.2-1.5).

8. The sulfur solvent according to claim 1, wherein The mass ratio of the amine and the alcohol is (1.3-4):(0.5-2.5).

9. A method for producing the sulfur solvent according to any one of claims 1 to 8, characterized by, The method comprises the following steps: taking the formula amount of each component, and mixing uniformly to obtain the sulfur dissolving agent.

10. Use of the sulfur dissolving agent according to any one of claims 1-8 for dissolving sulfur deposited in a wellbore of an oil and gas well.

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