High-penetration broad-spectrum fungicide for offshore oil fields and preparation method thereof

Abstract

The present invention belongs to the technical field of bactericides, and specifically relates to a high-penetration broad-spectrum bactericide for offshore oil fields and a preparation method thereof. The high-penetration broad-spectrum bactericide is composed of the following raw materials in parts by weight: 1.8-2.5 parts of N, N-bis (dodecyl dimethyl)-3-aza-1,5-pentanediamine dichloride, 12-14 parts of triphenyl quaternary phosphonium salt, 5-8 parts of 2,2-dibromo-3-nitrilopropionamide, 6-9 parts of sodium ethylenediamine tetramethylenephosphonate, 2-3 parts of oleic acid diethylenetriamine imidazoline, 1.4-1.7 parts of epoxypropyl trimethylammonium chloride, 0.9-1.2 parts of lauryl alcohol polyoxyethylene ether, and 65-67 parts of water. The preparation method of the high-penetration broad-spectrum bactericide for offshore oil fields of the present invention has simple process and is easy to produce. The bactericide raw materials prepared by the method have good compatibility, high sterilization efficiency, strong penetration, and also have scale inhibition and corrosion inhibition.

Description

Technical Field

[0001] The invention belongs to the technical field of fungicides, and specifically relates to a high-penetration broad-spectrum fungicide for offshore oil fields and a preparation method thereof. Background Art

[0002] Major oil fields in my country have entered the middle and late stages of development. The continuous increase in water injection and production in oil fields, the increase in the water content of produced fluids, and the application of polymer flooding have created favorable conditions for the reproduction of bacteria. There are sulfate-reducing bacteria, iron bacteria, saprophytic bacteria, petroleum hydrocarbon degradation bacteria, denitrifying bacteria, methanogens, sulfur bacteria and other bacteria in the oil field water injection system. Saprophytic bacteria (TGB), iron bacteria (IB) and sulfate-reducing bacteria (SRB) are the three most harmful bacteria in oilfield wastewater. There is an intrinsic connection between these three bacteria. Saprophytic bacteria and iron bacteria are aerobic bacteria that can consume oxygen in the environment to provide anaerobic conditions for SRB (anaerobic bacteria) to enable rapid reproduction; the energy released by IB can assimilate carbon dioxide and water into organic matter, which can provide other types of bacteria for growth and reproduction. Therefore, saprophytic bacteria, iron bacteria and sulfate-reducing bacteria can reproduce and grow in large quantities. Both TGB and IB can produce sticky substances, which can easily clog the filter and the seepage end face of the injection well. The corrosion product FeS black precipitate produced by SRB enters the injection well with the injected water and blocks the seepage channel. Therefore, the growth of bacteria has a huge impact on the water injection system, which will seriously deteriorate the quality of the injection water, cause the injection pipeline and the wellbore oil pipe to corrode, perforate, clog or even break. Metabolites and corrosion sediments are injected into the formation to clog the channel, causing a serious decrease in the permeability of the reservoir, and even degrade other oilfield chemicals and reduce the efficiency of the use of agents. Therefore, in oilfield exploitation, effectively controlling the growth and reproduction of bacteria to avoid the harm of bacteria to pipelines and related equipment is of great practical significance to oilfield production and is also a problem that needs to be solved urgently.

[0003] Since bacteria have strong vitality, any bactericide used for a long time will make bacteria resistant, causing the bactericidal efficiency of the bactericide to decrease. Increasing the amount of bactericide used will not effectively control and kill the microorganisms in the oil and water system, causing the risk of excessive bacteria. Therefore, it is urgent to find a new type of bactericide to expand the scope of use of bactericides. Summary of the invention

[0004] The purpose of the present invention is to provide a high-penetration broad-spectrum fungicide for offshore oil fields. The fungicide has high sterilization efficiency, strong penetration and wide action range; the present invention also provides a preparation method thereof.

[0005] The high-penetration broad-spectrum fungicide for offshore oil fields of the present invention is composed of the following raw materials, measured by weight: 1.8-2.5 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 12-14 parts of triphenyl quaternary phosphonium salt, 5-8 parts of 2,2-dibromo-3-nitrilopropionamide, 6-9 parts of sodium ethylenediaminetetramethylenephosphonate, 2-3 parts of oleic acid diethylenetriamine imidazoline, 1.4-1.7 parts of epoxypropyltrimethylammonium chloride, 0.9-1.2 parts of lauryl alcohol polyoxyethylene ether and 65-67 parts of water.

[0006] Preferably, the high-penetration broad-spectrum fungicide for offshore oil fields described in the present invention is composed of the following raw materials, measured in parts by weight: 2.1 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 13 parts of triphenyl quaternary phosphonium salt, 6.5 parts of 2,2-dibromo-3-nitrilopropionamide, 7.5 parts of sodium ethylenediaminetetramethylenephosphonate, 2.5 parts of oleic acid diethylenetriamine imidazoline, 1.6 parts of epoxypropyltrimethylammonium chloride, 1.1 parts of lauryl alcohol polyoxyethylene ether, and 66 parts of water.

[0007] in:

[0008] The structural formula of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride is [C 12 H 25 N(CH3)2(CH2)2NH(CH2)2NC 12 H 25 ] 2+ 2Cl - .

[0009] The preparation method of triphenyl quaternary phosphonium salt is as follows: heating the mixed solution of chloromethylated styrene and dimethylformamide to 115-118° C., then dripping the mixed solution of triphenylphosphine and dimethylformamide therein, and after the dripping is completed, reflux at a constant temperature for 13-13.5 hours, and finally cooling to room temperature, and distilling under reduced pressure to prepare triphenyl quaternary phosphonium salt.

[0010] in:

[0011] The volume ratio of chloromethylated styrene to dimethylformamide in the mixed solution of chloromethylated styrene and dimethylformamide is 1:11.

[0012] The mass volume ratio of triphenylphosphine to dimethylformamide in the mixed solution of triphenylphosphine and dimethylformamide is 0.35:1, and the unit is g / mL.

[0013] The high-penetration broad-spectrum fungicide for offshore oil fields of the present invention uses a mixture of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, triphenyl quaternary phosphonium salt and 2,2-dibromo-3-nitrilopropionamide as a bactericidal component. The three are used in combination to have good bactericidal and antibacterial effects on saprophytes, iron bacteria and sulfate-reducing bacteria, avoiding the long-term use of a single bactericide to cause bacteria to develop drug resistance. Among them, N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride has a unique quadrilateral structure, and the bactericidal property is less affected by pH value, has high charge strength and molecular polarity, and is more likely to undergo adsorption reaction with the charge on the cell surface. The positively charged organic cations in N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride selectively adsorb negatively charged bacteria, and enter the cell membrane through the surface through penetration and diffusion, thereby hindering the semi-permeability of the cell membrane, and further penetrate into the cell, inactivating the cell enzymes and preventing the production of protein enzymes, thereby denaturing the proteins and killing the bacterial cells. 2,2-dibromo-3-nitrilopropionamide can quickly penetrate the cell membrane of microorganisms and act on certain protein groups to stop the normal oxidation and reduction of the cells, thereby causing cell death. Its addition reduces the foaming property of the fungicide while improving the stripping performance of the fungicide, and has a good slime inhibition effect. In addition, its special molecular structure determines that its branches can also selectively bromine the special enzyme metabolites of microorganisms, and also has a good bactericidal effect on algae, thereby increasing the scope of action of the fungicide. The triphenyl quaternary phosphonium salt is a small molecule, which is more easily selectively adsorbed on the bacterial surface than dichloro N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine, and has reduced resistance when diffusing through the bacterial cell wall. Therefore, when used in combination with dichloro N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine and 2,2-dibromo-3-nitrilopropionamide, the effect of the fungicide is increased, the time for the fungicide to take effect is shortened, the comprehensive action time and use efficiency of the fungicide are prolonged, and the prepared fungicide has broad-spectrum bactericidal properties.

[0014] The high-penetration broad-spectrum fungicide for offshore oil fields of the present invention is further added with sodium ethylenediaminetetramethylenephosphonate, diethylenetriamine imidazoline oleate, epoxypropyltrimethylammonium chloride and lauryl alcohol polyoxyethylene ether. Since the calcium and magnesium ion content in seawater is relatively high, after contacting with formation water, the two are incompatible and easily cause inorganic scale to form in the formation, thereby causing formation blockage and affecting oil well production. Therefore, sodium ethylenediaminetetramethylenephosphonate is creatively added to the fungicide, and sodium ethylenediaminetetramethylenephosphonate can chelate with calcium and magnesium ions to form a network complex, thereby preventing the growth of inorganic scale. Diethylenetriamine imidazoline oleate is an imidazoline derivative containing anions and cations, and the polar imidazoline ring is adsorbed on the surface of the water injection pipeline and the wellbore oil pipe, and the non-polar long chain is arranged in the bacterial corrosion system to form a stable protective film, thereby playing the role of a corrosion inhibitor. Since the growth of bacteria will seriously deteriorate the quality of injection water, and bacterial metabolites and corrosion sediments will block the pores after being injected into the formation, causing a serious decrease in the permeability of the reservoir, epoxypropyl trimethyl ammonium chloride and lauryl alcohol polyoxyethylene ether are creatively added to the fungicide, and the two are used in combination to enhance the penetration of the fungicide. Epoxypropyl trimethyl ammonium chloride has a stretched cationic side chain, and its addition greatly improves the hydrophilicity of the prepared penetrating broad-spectrum fungicide. The compounding of lauryl alcohol polyoxyethylene ether enhances the hard water resistance and compatibility of the prepared penetrating broad-spectrum fungicide; the combination of the two enhances the permeability of the prepared fungicide, opens the blocked pores through penetration, and thus increases the effective distance of the broad-spectrum fungicide sterilization operation.

[0015] The method for preparing the high-penetration broad-spectrum fungicide for offshore oil fields of the present invention comprises the following steps:

[0016] (1) adding 2,2-dibromo-3-nitrilopropionamide and epoxypropyltrimethylammonium chloride to water, stirring at 140-145° C. for 25-30 minutes, then cooling to 75-80° C., adding N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride and triphenylphosphonium salt, and continuing to stir for 15-20 minutes to prepare a first mixture;

[0017] (2) adding lauryl alcohol polyoxyethylene ether to the first mixture prepared in step (1) and stirring to dissolve the mixture to prepare a second mixture;

[0018] (3) Adding sodium ethylenediaminetetra(methylenephosphonate) and diethylenetriamine imidazoline oleate to the second mixture prepared in step (2), and continuing to stir and dissolve, thereby preparing a high-penetration broad-spectrum fungicide for offshore oil fields.

[0019] in:

[0020] The temperature for stirring and dissolving in step (2) is 50-55°C, and the time for stirring and dissolving is 10-12 minutes.

[0021] The stirring and dissolving temperature in step (3) is room temperature, and the stirring and dissolving time is 5-8 minutes.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The high-penetration broad-spectrum fungicide for offshore oil fields described in the present invention uses a mixture of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, triphenyl quaternary phosphonium salt and 2,2-dibromo-3-nitrilopropionamide as a fungicide component, so that the fungicide can take effect quickly and broaden the scope of action of the fungicide. The prepared fungicide has a broad spectrum and a good slime inhibition effect.

[0024] (2) The method for preparing a high-penetration broad-spectrum fungicide for offshore oil fields described in the present invention has a simple process and is easy to produce. The fungicide raw materials prepared by the method have good compatibility with each other, high bactericidal efficiency and strong penetration. In addition, it also has scale inhibition and corrosion inhibition properties. DETAILED DESCRIPTION

[0025] The present invention is further described below with reference to the embodiments.

[0026] Example 1

[0027] The high-penetration broad-spectrum fungicide for offshore oil fields described in Example 1 is composed of the following raw materials, measured in parts by weight: 2.1 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 13 parts of triphenyl quaternary phosphonium salt, 6.5 parts of 2,2-dibromo-3-nitrilopropionamide, 7.5 parts of sodium ethylenediaminetetramethylenephosphonate, 2.5 parts of oleic acid diethylenetriamine imidazoline, 1.6 parts of epoxypropyltrimethylammonium chloride, 1.1 parts of lauryl alcohol polyoxyethylene ether, and 66 parts of water.

[0028] in:

[0029] The structural formula of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride is [C 12 H 25 N(CH3)2(CH2)2NH(CH2)2NC 12 H 25 ] 2+ 2Cl - .

[0030] The preparation method of triphenyl quaternary phosphonium salt is as follows: heating the mixed solution of chloromethylated styrene and dimethylformamide to 117° C., then dripping the mixed solution of triphenylphosphine and dimethylformamide therein, and after the dripping is completed, reflux at a constant temperature for 13.2 hours, and finally cooling to room temperature, and distilling under reduced pressure to prepare triphenyl quaternary phosphonium salt.

[0031] in:

[0032] The volume ratio of chloromethylated styrene to dimethylformamide in the mixed solution of chloromethylated styrene and dimethylformamide is 1:11.

[0033] The mass volume ratio of triphenylphosphine to dimethylformamide in the mixed solution of triphenylphosphine and dimethylformamide is 0.35:1, and the unit is g / mL.

[0034] The method for preparing the high-penetration broad-spectrum fungicide for offshore oil fields described in Example 1 is composed of the following steps:

[0035] (1) adding 2,2-dibromo-3-nitrilopropionamide and epoxypropyltrimethylammonium chloride into water and stirring at 143° C. for 27 minutes, then cooling to 77° C., adding N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride and triphenylphosphonium salt and continuing stirring for 18 minutes to prepare a first mixture;

[0036] (2) adding lauryl alcohol polyoxyethylene ether to the first mixture prepared in step (1) and stirring to dissolve the mixture to prepare a second mixture;

[0037] (3) Adding sodium ethylenediaminetetra(methylenephosphonate) and diethylenetriamine imidazoline oleate to the second mixture prepared in step (2), and continuing to stir and dissolve, thereby preparing a high-penetration broad-spectrum fungicide for offshore oil fields.

[0038] in:

[0039] The temperature for stirring and dissolving in step (2) is 53° C., and the time for stirring and dissolving is 11 min.

[0040] The stirring and dissolving temperature in step (3) is room temperature, and the stirring and dissolving time is 7 minutes.

[0041] Example 2

[0042] The high-penetration broad-spectrum fungicide for offshore oil fields described in Example 2 is composed of the following raw materials, measured in parts by weight: 1.8 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 12 parts of triphenyl quaternary phosphonium salt, 8 parts of 2,2-dibromo-3-nitrilopropionamide, 6 parts of sodium ethylenediaminetetramethylenephosphonate, 3 parts of oleic acid diethylenetriamine imidazoline, 1.7 parts of epoxypropyltrimethylammonium chloride, 1.2 parts of lauryl alcohol polyoxyethylene ether, and 67 parts of water.

[0043] in:

[0044] The structural formula of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride is [C 12 H 25N(CH3)2(CH2)2NH(CH2)2NC 12 H 25 ] 2+ 2Cl - .

[0045] The preparation method of triphenyl quaternary phosphonium salt is as follows: heating the mixed solution of chloromethylated styrene and dimethylformamide to 115° C., then dripping the mixed solution of triphenylphosphine and dimethylformamide therein, and after the dripping is completed, reflux at a constant temperature for 13.5 hours, and finally cooling to room temperature, and distilling under reduced pressure to prepare triphenyl quaternary phosphonium salt.

[0046] in:

[0047] The volume ratio of chloromethylated styrene to dimethylformamide in the mixed solution of chloromethylated styrene and dimethylformamide is 1:11.

[0048] The mass volume ratio of triphenylphosphine to dimethylformamide in the mixed solution of triphenylphosphine and dimethylformamide is 0.35:1, and the unit is g / mL.

[0049] The preparation method of the high-penetration broad-spectrum fungicide for offshore oil fields described in Example 2 is composed of the following steps:

[0050] (1) adding 2,2-dibromo-3-nitrilopropionamide and epoxypropyltrimethylammonium chloride into water and stirring at 145° C. for 30 minutes, then cooling to 80° C., adding N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride and triphenylphosphonium salt and continuing stirring for 15 minutes to prepare a first mixture;

[0051] (2) adding lauryl alcohol polyoxyethylene ether to the first mixture prepared in step (1) and stirring to dissolve the mixture to prepare a second mixture;

[0052] (3) Adding sodium ethylenediaminetetra(methylenephosphonate) and diethylenetriamine imidazoline oleate to the second mixture prepared in step (2), and continuing to stir and dissolve, thereby preparing a high-penetration broad-spectrum fungicide for offshore oil fields.

[0053] in:

[0054] The temperature for stirring and dissolving in step (2) is 55° C., and the time for stirring and dissolving is 10 min.

[0055] The stirring and dissolving temperature in step (3) is room temperature, and the stirring and dissolving time is 5 minutes.

[0056] Example 3

[0057] The high-penetration broad-spectrum fungicide for offshore oil fields described in Example 3 is composed of the following raw materials, measured in parts by weight: 2.5 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 14 parts of triphenyl quaternary phosphonium salt, 5 parts of 2,2-dibromo-3-nitrilopropionamide, 9 parts of sodium ethylenediaminetetramethylenephosphonate, 2 parts of oleic acid diethylenetriamine imidazoline, 1.4 parts of epoxypropyltrimethylammonium chloride, 0.9 parts of lauryl alcohol polyoxyethylene ether, and 65 parts of water.

[0058] in:

[0059] The structural formula of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride is [C 12 H 25 N(CH3)2(CH2)2NH(CH2)2NC 12 H 25 ] 2+ 2Cl - .

[0060] The preparation method of triphenyl quaternary phosphonium salt is as follows: heating the mixed solution of chloromethylated styrene and dimethylformamide to 118° C., then dripping the mixed solution of triphenylphosphine and dimethylformamide therein, and after the dripping is completed, reflux at a constant temperature for 13 hours, and finally cooling to room temperature, and distilling under reduced pressure to prepare triphenyl quaternary phosphonium salt.

[0061] in:

[0062] The volume ratio of chloromethylated styrene to dimethylformamide in the mixed solution of chloromethylated styrene and dimethylformamide is 1:11.

[0063] The mass volume ratio of triphenylphosphine to dimethylformamide in the mixed solution of triphenylphosphine and dimethylformamide is 0.35:1, and the unit is g / mL.

[0064] The method for preparing the high-penetration broad-spectrum fungicide for offshore oil fields described in Example 3 is composed of the following steps:

[0065] (1) adding 2,2-dibromo-3-nitrilopropionamide and epoxypropyltrimethylammonium chloride into water and stirring at 140° C. for 25 minutes, then cooling to 75° C., adding N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride and triphenylphosphonium salt and continuing stirring for 20 minutes to prepare a first mixture;

[0066] (2) adding lauryl alcohol polyoxyethylene ether to the first mixture prepared in step (1) and stirring to dissolve the mixture to prepare a second mixture;

[0067] (3) Adding sodium ethylenediaminetetra(methylenephosphonate) and diethylenetriamine imidazoline oleate to the second mixture prepared in step (2), and continuing to stir and dissolve, thereby preparing a high-penetration broad-spectrum fungicide for offshore oil fields.

[0068] in:

[0069] The stirring and dissolving temperature in step (2) is 50° C., and the stirring and dissolving time is 12 min.

[0070] The stirring and dissolving temperature in step (3) is room temperature, and the stirring and dissolving time is 8 minutes.

[0071] Comparative Example 1

[0072] The preparation method of the offshore oilfield fungicide described in this comparative example 1 is the same as that in Example 1, and the only difference is that the raw material composition of the fungicide is different. The offshore oilfield fungicide described in this comparative example 1 is composed of the following raw materials in parts by weight: 13 parts of triphenyl quaternary phosphonium salt, 6.5 parts of 2,2-dibromo-3-nitrilopropionamide, 7.5 parts of sodium ethylenediaminetetramethylenephosphonate, 2.5 parts of oleic acid diethylenetriamine imidazoline, 1.6 parts of epoxypropyltrimethylammonium chloride, 1.1 parts of lauryl alcohol polyoxyethylene ether, and 66 parts of water.

[0073] Comparative Example 2

[0074] The preparation method of the offshore oilfield fungicide described in this comparative example 2 is the same as that in Example 1, the only difference being that the raw material composition of the fungicide is different. The offshore oilfield fungicide described in this comparative example 2 is composed of the following raw materials in parts by weight: 2.1 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 6.5 parts of 2,2-dibromo-3-nitrilopropionamide, 7.5 parts of sodium ethylenediaminetetramethylenephosphonate, 2.5 parts of oleic acid diethylenetriamine imidazoline, 1.6 parts of epoxypropyltrimethylammonium chloride, 1.1 parts of lauryl alcohol polyoxyethylene ether, and 66 parts of water.

[0075] Comparative Example 3

[0076] The preparation method of the offshore oilfield fungicide described in this comparative example 3 is the same as that in Example 1, the only difference being that the raw material composition of the fungicide is different. The offshore oilfield fungicide described in this comparative example 3 is composed of the following raw materials in parts by weight: 2.1 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 13 parts of triphenyl quaternary phosphonium salt, 7.5 parts of sodium ethylenediaminetetramethylenephosphonate, 2.5 parts of diethylenetriamine imidazoline oleate, 1.6 parts of epoxypropyltrimethylammonium chloride, 1.1 parts of lauryl alcohol polyoxyethylene ether, and 66 parts of water.

[0077] The performance tests were performed on the fungicides prepared in Examples 1-3 and Comparative Examples 1-3, wherein: the performance evaluation method of the fungicide adopted the test bottle method of the extinction dilution method, the reference standards were "Fungicide Performance Evaluation Method" (SY / T 5890), "Water Quality Indicators and Analysis Methods for Water Injection in Clastic Reservoirs" (SY / T 5329-2012), and the fungicide addition amount was 10 mg / L.

[0078] Table 1 Test results of fungicide bactericidal performance

[0079]

[0080] Refer to CNOOC Q / HS 2064-2011 "Corrosion Control and Effect Evaluation Requirements in Offshore Oil and Gas Field Production Process Systems". Add the water sample from Shengli Oilfield to the high-pressure rotary hanging kettle and heat it to 50°C. Deoxygenate it with nitrogen for 10 minutes and add 30mg / L of sodium sulfite to fully deoxygenate it. Hang the X65 steel test piece in the test medium, seal it, and then replace and deoxygenate it with nitrogen twice. Pressurize it to 1.3MPa with nitrogen, and then pressurize it to 1.5MPa with CO2. After confirming the airtightness of the test device, start the stirring device and control the speed to 200r / min; the concentration of the fungicide is 20mg / L, and the test piece is taken out after 72h, cleaned, dried and weighed. The average corrosion rate and corrosion inhibition rate are calculated from the mass loss of the test piece. After the test, the data with dissolved oxygen concentration less than 0.2mg / L in the test medium are valid data.

[0081] Table 2 Test results of biocide corrosion inhibition performance

[0082]

Claims

1. A high-penetration broad-spectrum fungicide for offshore oil fields, characterized in that: The invention is composed of the following raw materials in parts by weight: 1.8-2.5 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 12-14 parts of triphenyl quaternary phosphonium salt, 5-8 parts of 2,2-dibromo-3-nitrilopropionamide, 6-9 parts of sodium ethylenediaminetetramethylenephosphonate, 2-3 parts of diethylenetriamine imidazoline oleate, 1.4-1.7 parts of epoxypropyltrimethylammonium chloride, 0.9-1.2 parts of lauryl alcohol polyoxyethylene ether, and 65-67 parts of water; in: The preparation method of triphenyl quaternary phosphonium salt is as follows: heating a mixture of chloromethylated styrene and dimethylformamide to 115-118° C., then dripping a mixture of triphenylphosphine and dimethylformamide therein, and after the dripping is complete, reflux at a constant temperature for 13-13.5 hours, and finally cooling to room temperature, and distilling under reduced pressure to prepare triphenyl quaternary phosphonium salt; The volume ratio of chloromethylated styrene to dimethylformamide in the mixed solution of chloromethylated styrene and dimethylformamide is 1:11; The mass volume ratio of triphenylphosphine to dimethylformamide in the mixed solution of triphenylphosphine and dimethylformamide is 0.35:1, and the unit is g / mL.

2. The high-penetration broad-spectrum fungicide for offshore oil fields according to claim 1, characterized in that: The preparation method is composed of the following raw materials in parts by weight: 2.1 parts of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride, 13 parts of triphenyl quaternary phosphonium salt, 6.5 parts of 2,2-dibromo-3-nitrilopropionamide, 7.5 parts of sodium ethylenediaminetetra(methylenephosphonate), 2.5 parts of diethylenetriamine imidazoline oleate, 1.6 parts of glycidyltrimethylammonium chloride, 1.1 parts of lauryl alcohol polyoxyethylene ether and 66 parts of water.

3. The high-penetration broad-spectrum fungicide for offshore oil fields according to claim 1, characterized in that: The structural formula of N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride is [C 12 H 25 N(CH3)2(CH2)2NH(CH2)2NC 12 H 25 ] 2+ 2Cl - .

4. A method for preparing the high-penetration broad-spectrum fungicide for offshore oil fields according to claim 1, characterized in that: It consists of the following steps: (1) adding 2,2-dibromo-3-nitrilopropionamide and epoxypropyltrimethylammonium chloride to water, stirring at 140-145° C. for 25-30 minutes, then cooling to 75-80° C., adding N,N-bis(dodecyldimethyl)-3-aza-1,5-pentanediamine dichloride and triphenylphosphonium salt, and continuing to stir for 15-20 minutes to prepare a first mixture; (2) adding lauryl alcohol polyoxyethylene ether to the first mixture prepared in step (1) and stirring to dissolve the mixture to prepare a second mixture; (3) Adding sodium ethylenediaminetetra(methylenephosphonate) and diethylenetriamine imidazoline oleate to the second mixture prepared in step (2), and continuing to stir and dissolve, thereby preparing a high-penetration broad-spectrum fungicide for offshore oil fields.

5. The method for preparing a high-penetration broad-spectrum fungicide for offshore oil fields according to claim 4, characterized in that: The temperature for stirring and dissolving in step (2) is 50-55°C, and the time for stirring and dissolving is 10-12 minutes.

6. The method for preparing a high-penetration broad-spectrum fungicide for offshore oil fields according to claim 4, characterized in that: The stirring and dissolving temperature in step (3) is room temperature, and the stirring and dissolving time is 5-8 minutes.

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