Compound oil-based paraffin remover and inhibitor and preparation method thereof

Abstract

According to the compound oil-based paraffin remover and inhibitor and the preparation method thereof, a paraffin remover and a paraffin inhibitor are compounded together for the first time, a wetting dispersant is added into light oil, benzene series and copolymer paraffin inhibitors, a hydrophilic end is combined with the paraffin inhibitor, and an oleophylic end is combined with light oil and benzene series, so that the oil-based paraffin remover and inhibitor are prepared. The combination of the paraffin remover and the paraffin inhibitor is realized, so that the compound agent can be used for paraffin removal and paraffin inhibition at the same time. The compound oil-based paraffin removal and inhibition agent is good in paraffin removal effect, high in paraffin removal rate, good in paraffin inhibition effect and high in paraffin inhibition rate; the problem that the paraffin removal effect and the paraffin control effect of an existing paraffin removal and control agent cannot be considered at the same time is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield chemical agents, and in particular relates to a compound oil-based wax removing and preventing agent and a preparation method thereof. Background Art

[0002] Most of the crude oil produced from oil fields is waxy. More than 90% of the crude oil has a wax content greater than 10%, and most of the crude oil exceeds 20%, and can even reach 40%. For high-wax oil fields, the wax content continues to increase with the increase in development depth, and the wax content in some areas can reach up to 50%. Waxy crude oil in the formation exists in liquid form due to high temperature and pressure conditions. However, with the continuous decrease in temperature and pressure during oil field exploitation and crude oil transportation, the solubility of paraffin in crude oil continues to decrease. When the wall temperature of the oil pipeline is lower than the wax precipitation point, the dissolution balance of the wax is destroyed, and wax crystals are precipitated on the pipe wall, forming a "wax deposition" phenomenon. For long-term oil pipelines, the "wax deposition" phenomenon reduces the effective area of ​​the oil pipeline, that is, the flow area of ​​the pipeline, increases the roughness of the pipe wall surface, increases the energy consumption in the operation of the oil pipeline, and even affects the safe operation of the pipeline, causing safety accidents such as blockage and condensation of the pipe, resulting in huge economic losses and safety hazards.

[0003] Therefore, the wax deposition problem in oil wells is one of the technical problems that the domestic and foreign petroleum industries have long faced. It has a direct impact on the efficient development of oil fields and the normal production of oil wells. It also has a restraining effect on the production speed of oil wells and the improvement of crude oil recovery rate. At present, in order to solve the wax blockage problem of waxy crude oil, oil field conditions mainly adopt the method of injecting chemicals and mechanical wax removal. However, the existing wax removal agents and wax inhibitors have single functionality and cannot solve the problems of wax precipitation and wax deposition. Mechanical wax removal can only temporarily solve the wax deposition phenomenon and is complicated to operate. Improper operation can easily cause pipeline blockage. Therefore, it is of great significance to develop a wax removal and wax inhibitor that integrates wax removal and wax prevention functions. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a compound oil-based wax removing and preventing agent and a preparation method thereof, so as to solve the problem that the wax removing and preventing agents in the prior art have single functions and are difficult to solve the problem of wax precipitation and wax deposition at one time.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A compound oil-based wax remover and wax inhibitor comprises, by weight percentage, 20-80% of light-medium oil, 10-40% of toluene, 10-40% of xylene, 1-10% of wetting and dispersing agent, and 1-10% of wax inhibitor.

[0007] A further improvement of the present invention is:

[0008] Preferably, the light medium oil is aviation kerosene, diesel, 120# solvent oil, or a mixture of several of them.

[0009] Preferably, the wax inhibitor includes at least any one of ethylene-vinyl acetate copolymer and long-chain alkyl acrylate polymer.

[0010] Preferably, the long-chain alkyl acrylate polymer includes polylauryl acrylate, polytetradecyl acrylate, polyhexadecyl acrylate and polyoctadecyl acrylate.

[0011] Preferably, the molecular weight of the long-chain alkyl acrylate polymer is 5000-10000, and it is obtained by polymerization of long-chain alkyl acrylate monomers.

[0012] Preferably, the wetting and dispersing agent is one or a mixture of nonylphenol polyoxyethylene ether, polysorbate, sorbitan monooleate, sorbitan monopalmitate, octylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene polyoxypropylene ether, polyethylene glycol, and polypropylene glycol.

[0013] Preferably, the molecular weight of the wetting and dispersing agent is 200-1000.

[0014] Preferably, based on mass fraction, it includes 46% of aviation kerosene, 19% of toluene, 19% of xylene, 9% of ethylene-vinyl acetate copolymer, 3.5% of polyethylene glycol and 3.5% of nonylphenol polyoxyethylene ether.

[0015] A method for preparing a composite oil-based wax remover and inhibitor comprises the following steps:

[0016] Step 1, adding toluene and xylene and stirring evenly, adding a wax inhibitor, and heating until completely dissolved to obtain a mixture;

[0017] Step 2, adding light medium oil to the mixture, stirring and adding a wetting dispersant, and preparing a compound oil-based wax remover and inhibitor after the mixture is completely dissolved.

[0018] Preferably, in step 1, the heating temperature is 20-100°C.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The invention discloses a compound oil-based wax remover and wax inhibitor, which is the first to compound a wax remover and a wax inhibitor together. By adding a wetting dispersant to light oil, benzene series and copolymer wax inhibitor, the hydrophilic end is combined with the wax inhibitor, and the lipophilic end is combined with the light oil and benzene series, so as to realize the combination of the wax remover and the wax inhibitor, so that the compound can remove wax and prevent wax at the same time. The compound oil-based wax remover and wax inhibitor has good wax removal effect, high wax removal rate, good wax prevention effect and high wax prevention rate; when the wax removal rate oil-based wax remover and wax inhibitor is not added with wax prevention agent, the wax prevention rate is 0%, and after the copolymer wax inhibitor is added, the wax prevention rate is significantly increased to nearly 40%, which is much higher than the standard requirement of 30%, and at the same time, the wax dissolution rate of 0.151g / min can be maintained. Both are much higher than the 0.016 wax dissolution rate and 30% wax prevention rate required by the standard SY / T6300. The problem that the wax removal and wax prevention effects of the current wax remover and wax inhibitor cannot be taken into account at the same time is solved.

[0021] Furthermore, the compounded oil-based wax removing and preventing agent of the present invention has a high closed cup flash point (52° C.) and good safety, which is higher than the standard of not less than 45° C. for a class of wax removing and preventing agents. DETAILED DESCRIPTION

[0022] On one hand, the present invention discloses a compound oil-based wax removing and preventing agent, which is composed of the following components: light medium oil, toluene, xylene, a wetting and dispersing agent and a wax preventing agent.

[0023] The compound oil-based wax remover and wax inhibitor comprises the following components in percentage by mass: 20-80% of light medium oil, 10-40% of toluene, 10-40% of xylene, 1-10% of wetting dispersant and 1-10% of wax inhibitor.

[0024] The light medium oil is aviation kerosene, diesel, 120# solvent oil or a mixture of the two.

[0025] The wax-proofing agent is one or a mixture of ethylene-vinyl acetate copolymer, polylauryl acrylate (PAE12), polytetradecyl acrylate (PAE14), polyhexadecyl acrylate (PAE16), polyoctadecyl acrylate (PAE18).

[0026] Among them, polylauryl acrylate (PAE12), polytetradecyl acrylate (PAE14), polyhexadecyl acrylate (PAE16), and polyoctadecyl acrylate (PAE18) are all long-chain alkyl acrylate polymers, which are obtained by polymerization of long-chain alkyl acrylate monomers. The molecular weight of the long-chain alkyl acrylate polymer is 5000-10000, which prevents the problem of too high polymerization degree and difficulty in dissolving.

[0027] The wetting and dispersing agent is one or a mixture of nonylphenol polyoxyethylene ether, polysorbate, sorbitan monooleate, sorbitan monopalmitate, octylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene polyoxypropylene ether, polyethylene glycol, and polypropylene glycol.

[0028] The molecular weight of the wetting and dispersing agent polyethylene glycol is 200-1000, and the molecular weight of the wetting and dispersing agent polypropylene glycol is 200-600.

[0029] The preparation method comprises the following steps:

[0030] Step 1, add toluene and xylene into a beaker, mix evenly, add the copolymer wax inhibitor under constant stirring, heat until completely dissolved, and obtain a mixture, the heating temperature range is 20 to 100°C.

[0031] Step 2, add light medium oil to the hot mixture in the beaker, add the wetting dispersant while stirring continuously, mix evenly until completely dissolved, and prepare a compound oil-based wax remover and inhibitor.

[0032] The optimal formula for preparing the compound oil-based wax removing and preventing agent is 50g of aviation kerosene (46%), 20g of toluene (19%), 20g of xylene (19), 8g of ethylene-vinyl acetate copolymer (9%), 5g of polyethylene glycol 800, and 5g of nonylphenol polyoxyethylene ether (7%). At this time, the wax dissolution rate is 0.151g / min, the wax prevention rate is 38.5%, and the flash point is 52°C, all of which meet the standard requirements of SY / T 6300-2009 "Technical Conditions for Wax Removal and Preventive Agents for Oil Production".

[0033] In the following examples, the wax dissolving rate and wax preventing rate of the wax removing and preventing agent are calculated according to the following method.

[0034] Referring to the industry standard SY / T 6300-2009 "Technical Conditions for Wax Removers and Wax Inhibitors for Oil Production", the wax dissolution rate and wax prevention rate of wax removers and wax inhibitors were measured. Wax dissolution rate: First, prepare paraffin balls and weigh the mass as m1; take 50mL of oil-based wax remover and wax inhibitor and pour it into a beaker, put it in a 50℃ water bath until the temperature is constant, then put in the paraffin balls and react for 15 minutes; then use anhydrous ethanol to clean the paraffin balls, put the paraffin balls in a 50℃ oven to dry to constant weight, and weigh the mass of the wax balls after the reaction as m2; wax dissolution rate η = (m1-m2) / 15.

[0035] The static inverted cup method is used to measure the wax prevention rate of the wax inhibitor. The principle of the inverted cup method: when the temperature is lower than the wax precipitation point, the wax in the crude oil can be precipitated from the wall of the test cup, and then the wax prevention rate is calculated by measuring the amount of wax precipitation with or without the addition of the wax inhibitor. The specific experimental method is as follows. 1. Take two test cups and weigh them separately, record them as m3 (with wax inhibitor group) and m4 (without wax inhibitor group), accurate to 0.01g. 2. Then add 100±1g of condensate oil to each test cup. 3. Add 1±0.01g of wax inhibitor to one of the test cups, stir in a water bath at 80℃ for 30min until uniform, which is the dosing test solution; the other test cup does not contain wax inhibitor, which is called the blank test solution. 4. After the samples in the two test cups are stirred evenly, place the test cup containing the medicine and condensate directly in the stirring ice-water mixture at 0°C. Due to the temperature gradient on both sides of the test cup wall, the paraffin in the condensate will precipitate on the test cup wall. 5. Then empty the two test cups for 5 minutes and weigh them. The total mass of the test cup with anti-wax agent and the amount of wax is m5, and the total mass of the test cup without anti-wax agent and the amount of wax is m6, accurate to 0.01g. Anti-wax rate = [(m6-m4)-(m5-m3)] / (m6-m4).

[0036] Comparative Example

[0037] Add 50g aviation kerosene, 20g toluene and 20g xylene to a 200ml beaker and mix evenly. Add 10g nonylphenol polyoxyethylene ether under 50℃ water bath conditions and stir continuously until completely dissolved to prepare a compound oil-based wax remover and wax inhibitor. Measure its wax dissolution rate and wax protection rate for condensate oil according to the above method. Detect its flash point by closed cup flash point tester. Experimental results: wax dissolution rate is 0.596g / min, wax protection rate is 0%, and flash point is 41℃.

[0038] Example 1

[0039] Add 50g of ordinary diesel, 20g of toluene and 20g of xylene to a 200ml beaker and mix evenly. Add 10g of nonylphenol polyoxyethylene ether under 50℃ water bath conditions with constant stirring until completely dissolved to obtain a compound oil-based wax remover and wax inhibitor. The wax dissolution rate and wax prevention rate for condensate oil were measured according to the above method. The flash point was detected by a closed cup flash point tester. Experimental results: the wax dissolution rate was 0.488g / min, the wax prevention rate was 0%, and the flash point was 53℃. Replacing aviation kerosene with ordinary diesel can effectively increase the flash point of the wax remover and wax inhibitor, but the wax dissolution rate is reduced.

[0040] Example 2

[0041] Add 20g of ordinary diesel, 35g of toluene and 35g of xylene to a 200ml beaker and mix evenly. Add 10g of nonylphenol polyoxyethylene ether under constant stirring in a 50℃ water bath until it is completely dissolved to obtain a compound oil-based wax remover and wax inhibitor. The wax dissolution rate and wax prevention rate for condensate oil were measured according to the above method. The flash point was detected by a closed cup flash point tester. Experimental results: the wax dissolution rate was 0.702g / min, the wax prevention rate was 0%, and the flash point was 27℃. Increasing the aromatic content in the wax remover and wax inhibitor can increase the wax dissolution rate, but the flash point decreases significantly.

[0042] Example 3

[0043] Add 50g of aviation kerosene, 20g of toluene and 20g of xylene to a 200ml beaker and mix them evenly. Add 5g of polyethylene glycol 400 until completely dissolved under constant stirring in a 50℃ water bath, and then add 5g of nonylphenol polyoxyethylene ether until completely dissolved to obtain a compound oil-based wax remover and wax inhibitor. The wax dissolution rate and the wax protection rate for condensate oil were measured according to the above method. The flash point was detected by a closed cup flash point tester. Experimental results: the wax dissolution rate was 0.532g / min, the wax protection rate was 5.7%, and the flash point was 42℃. After adding polyethylene glycol, the wax dissolution rate decreased. It may be that the wetting reversal function of polyethylene glycol is weaker than that of nonylphenol polyoxyethylene ether, resulting in poor penetration ability and reduced wax dissolution rate. The wax protection rate has increased, but it still does not meet the standard requirement of not less than 30%.

[0044] Example 4

[0045] Add 50g aviation kerosene, 20g toluene and 20g xylene to a 200ml beaker and mix evenly. Add 5g polyethylene glycol 800 to completely dissolve under constant stirring in a 50℃ water bath, and then add 5g nonylphenol polyoxyethylene ether to completely dissolve to obtain a compound oil-based wax remover and wax inhibitor. The wax dissolution rate and wax protection rate for condensate oil were measured according to the above method. The flash point was detected by a closed cup flash point tester. Experimental results: the wax dissolution rate was 0.486g / min, the wax protection rate was 12.3%, and the flash point was 45℃. Increasing the molecular weight of polyethylene glycol, the wax dissolution rate continued to decrease, which may be due to the increase in viscosity as the molecular weight increases. The wax protection rate continued to rise and the flash point increased.

[0046] Example 5

[0047] Add 50g aviation kerosene, 20g toluene and 20g xylene to a 200ml beaker and mix well. Add 2g ethylene-vinyl acetate copolymer under constant stirring in a water bath at 80°C until it is completely dissolved, then add 5g polyethylene glycol 800 until it is completely dissolved, and then add 5g nonylphenol polyoxyethylene ether until it is completely dissolved to prepare a composite oil-based wax remover and wax inhibitor. The wax dissolution rate and the wax protection rate for condensate oil were measured according to the above method. The flash point was detected by a closed cup flash point tester. The difference from Example 4 is that ethylene-vinyl acetate copolymer was added. Experimental results: the wax dissolution rate was 0.362g / min, the wax protection rate was 20.6%, and the flash point was 45°C. After the addition of ethylene-vinyl acetate copolymer, the wax dissolution rate decreased significantly, but the wax protection rate increased.

[0048] Example 6

[0049] Add 50g aviation kerosene, 20g toluene and 20g xylene to a 200ml beaker and mix well. Add 5g ethylene-vinyl acetate copolymer under constant stirring at 80°C water bath until completely dissolved, then add 5g polyethylene glycol 800 until completely dissolved, and then add 5g nonylphenol polyoxyethylene ether until completely dissolved to prepare a composite oil-based wax remover and wax inhibitor. The wax dissolution rate and the wax protection rate for condensate oil were measured according to the above method. The flash point was detected by a closed cup flash point tester. The difference from Example 5 is that the amount of ethylene-vinyl acetate copolymer is increased. Experimental results: the wax dissolution rate is 0.257g / min, the wax protection rate is 27.9%, and the flash point is 46°C. As the amount of ethylene-vinyl acetate copolymer increases, the wax dissolution rate continues to decrease, and the wax protection rate continues to increase.

[0050] Example 7

[0051] Add 50g aviation kerosene, 20g toluene and 20g xylene to a 200ml beaker and mix evenly. Add 8g ethylene-vinyl acetate copolymer under constant stirring at 80°C water bath until completely dissolved, then add 5g polyethylene glycol 800 until completely dissolved, and then add 5g nonylphenol polyoxyethylene ether until completely dissolved to prepare a composite oil-based wax remover and wax inhibitor. Measure its wax dissolution rate and wax protection rate for condensate oil according to the above method. Detect its flash point by a closed cup flash point tester. The difference from Example 6 is that the amount of ethylene-vinyl acetate copolymer is further increased. Experimental results: the wax dissolution rate is 0.151g / min, the wax protection rate is 38.5%, and the flash point is 52°C. As the amount of ethylene-vinyl acetate copolymer increases, the wax dissolution rate continues to decrease, and the wax protection rate continues to rise. The reason for the increase in the wax protection rate is that ethylene-vinyl acetate copolymer is an oil-soluble high molecular organic compound. Both its main chain and side chains contain non-polar parts that can form cocrystals with wax molecules and polar parts that distort the wax crystals. It can change the wax crystal morphology and spatial network structure in the oil phase and inhibit wax deposition. At the same time, the molecular chain of the copolymer is relatively long, which can form a network structure throughout the entire oil phase, so that the formed crystal nuclei are in a dispersed state and cannot aggregate with each other.

[0052] Example 8

[0053] Add 50g of aviation kerosene, 20g of toluene and 20g of xylene to a 200ml beaker and mix well. Add 8g of ethylene-vinyl acetate copolymer under constant stirring in an 80°C water bath until it is completely dissolved to prepare a composite oil-based wax remover and wax inhibitor. The wax dissolution rate and the wax protection rate for condensate oil were measured according to the above method. The flash point was detected by a closed cup flash point tester. The difference from Example 7 is that no wetting dispersant was added. Experimental results: the wax dissolution rate was 0.106g / min, the wax protection rate was 24.2%, and the flash point was 46°C. The reason why the wax protection rate was reduced without adding a wetting dispersant is that the wetting dispersant is a polymer with a phenolic or alcoholic group, and its main chain can be adsorbed on wax crystals and pipeline surfaces. The hydrophilic phenol group of the dispersant can wet the surface water, thereby minimizing the tendency of wax crystal growth and adsorption to the pipeline surface. The reason for the decrease in the wax dissolution rate is that the wetting and dispersing agent has a strong wetting, penetration and dispersing effect on paraffin, which can increase the wax dissolution rate. Therefore, not adding the dispersant leads to a decrease in the wax dissolution rate.

[0054] Example 9

[0055] Add 50g of aviation kerosene, 20g of toluene and 20g of xylene to a 200ml beaker and mix well. Add 8g of octadecyl polyacrylate under constant stirring in an 80°C water bath until completely dissolved, then add 5g of polyethylene glycol 800 until completely dissolved, and then add 5g of nonylphenol polyoxyethylene ether until completely dissolved to prepare a composite oil-based wax remover and wax inhibitor. The wax dissolution rate and the wax protection rate for condensate oil were measured according to the above method. The flash point was detected by a closed cup flash point tester. The difference from Example 7 is that ethylene-vinyl acetate copolymer is replaced with octadecyl polyacrylate. Experimental results: the wax dissolution rate is 0.163g / min, the wax protection rate is 31.5%, and the flash point is 54°C.

[0056] Example 10

[0057] Add 15g of aviation kerosene, 20g of toluene and 20g of xylene into a 200ml beaker and mix evenly. First, add 9g of ethylene-vinyl acetate copolymer under constant stirring in an 80°C water bath until it is completely dissolved, then add 5g of polyethylene glycol 800 until it is completely dissolved, and then add 5g of nonylphenol polyoxyethylene ether until it is completely dissolved to prepare a compound oil-based wax remover and inhibitor.

[0058] Embodiment 11

[0059] Add 230g of aviation kerosene, 20g of toluene and 20g of xylene into a 200ml beaker and mix evenly. First, add 7g of ethylene-vinyl acetate copolymer under constant stirring in an 80°C water bath until it is completely dissolved, then add 5g of polyethylene glycol 800 until it is completely dissolved, and then add 5g of nonylphenol polyoxyethylene ether until it is completely dissolved to prepare a compound oil-based wax remover and inhibitor.

[0060] Example 12

[0061] Add 50g of aviation kerosene, 10g of toluene and 25g of xylene into a 200ml beaker and mix evenly. First, add 5g of polylaurylic acid until it is completely dissolved, then add 5g of polyethylene glycol 800 until it is completely dissolved, and then add 5g of nonylphenol polyoxyethylene ether until it is completely dissolved, to prepare a compound oil-based wax remover and inhibitor, while constantly stirring in an 80°C water bath.

[0062] Embodiment 13

[0063] Add 50g of aviation kerosene, 58g of toluene and 22g of xylene into a 200ml beaker and mix evenly. First, add 5g of polytetradecanoic acid until it is completely dissolved, then add 5g of polyethylene glycol 800 until it is completely dissolved, and then add 5g of nonylphenol polyoxyethylene ether until it is completely dissolved, to prepare a compound oil-based wax remover and inhibitor, while constantly stirring in an 80°C water bath.

[0064] Embodiment 14

[0065] Add 50g of aviation kerosene, 25g of toluene and 10g of xylene into a 200ml beaker and mix evenly. Under constant stirring in an 80°C water bath, first add 5g of hexadecyl polyacrylate until it is completely dissolved, then add 5g of polyethylene glycol 800 until it is completely dissolved, and then add 5g of polysorbate until it is completely dissolved to prepare a compound oil-based wax remover and inhibitor.

[0066] Embodiment 15

[0067] Add 50g of aviation kerosene, 22g of toluene and 58g of xylene into a 200ml beaker and mix evenly. First, add 5g of hexadecyl polyacrylate under constant stirring in an 80°C water bath until it is completely dissolved, then add 5g of sorbitan monooleate until it is completely dissolved, and then add 5g of nonylphenol polyoxyethylene ether until it is completely dissolved to prepare a compound oil-based wax remover and inhibitor.

[0068] Example 16

[0069] Add 50g of aviation kerosene, 20g of toluene and 19g of xylene into a 200ml beaker and mix evenly. First, add 10g of ethylene-vinyl acetate copolymer under constant stirring in an 80°C water bath until it is completely dissolved, then add 0.5g of polypropylene glycol until it is completely dissolved, and then add 0.5g of polyoxyethylene polyoxypropylene ether until it is completely dissolved to prepare a compound oil-based paraffin remover and inhibitor.

[0070] Embodiment 17

[0071] Add 50g of aviation kerosene, 20g of toluene and 19g of xylene into a 200ml beaker and mix evenly. First, add 10g of ethylene-vinyl acetate copolymer under constant stirring in an 80°C water bath until it is completely dissolved, then add 5.5g of polyethylene glycol 800 until it is completely dissolved, and then add 5.5g of octylphenol polyoxyethylene ether until it is completely dissolved to prepare a compound oil-based paraffin remover and inhibitor.

[0072] Embodiment 18

[0073] Add 50g diesel, 20g toluene and 19g xylene into a 200ml beaker and mix evenly. Add 1g ethylene-vinyl acetate copolymer under constant stirring in an 80°C water bath until it is completely dissolved, then add 5g polyethylene glycol 800 until it is completely dissolved, and then add 5g fatty alcohol polyoxyethylene ether until it is completely dissolved to prepare a compound oil-based paraffin remover and inhibitor.

[0074] Embodiment 19

[0075] Add 50g120# solvent oil, 20g toluene and 19g xylene into a 200ml beaker and mix evenly. First add 11g ethylene-vinyl acetate copolymer under 80°C water bath conditions with constant stirring until it is completely dissolved, then add 5g polyethylene glycol 800 until it is completely dissolved, and then add 5g sorbitan monopalmitate until it is completely dissolved to prepare a compound oil-based paraffin remover and inhibitor.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A compound oil-based wax remover and inhibitor, characterized in that: Calculated by mass percentage, the light medium oil is 20-80%, toluene is 10-40%, xylene is 10-40%, wetting and dispersing agent is 1-10%, and wax inhibitor is 1-10%.

2. A compound oil-based wax removing and preventing agent according to claim 1, characterized in that: The light medium oil is one or a mixture of aviation kerosene, diesel, and 120# solvent oil.

3. A compound oil-based wax remover and inhibitor according to claim 1, characterized in that: The wax inhibitor includes at least one of ethylene-vinyl acetate copolymer and long-chain alkyl acrylate polymer.

4. A compound oil-based wax removing and preventing agent according to claim 3, characterized in that: The long-chain alkyl acrylate polymer includes polylauryl acrylate, polytetradecyl acrylate, polyhexadecyl acrylate and polyoctadecyl acrylate.

5. A compound oil-based wax removing and preventing agent according to claim 1, characterized in that: The molecular weight of the long-chain alkyl acrylate polymer is 5000-10000, and the polymer is obtained from long-chain alkyl acrylate monomers through polymerization reaction.

6. A compound oil-based wax removing and preventing agent according to claim 1, characterized in that: The wetting and dispersing agent is one or a mixture of nonylphenol polyoxyethylene ether, polysorbate, sorbitan monooleate, sorbitan monopalmitate, octylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene polyoxypropylene ether, polyethylene glycol, and polypropylene glycol.

7. A compound oil-based wax removing and preventing agent according to claim 1, characterized in that: The molecular weight of the wetting and dispersing agent is 200-1000.

8. The compound oil-based wax removing and preventing agent according to claim 1, characterized in that: Calculated by mass, it includes 46% aviation kerosene, 19% toluene, 19% xylene, 9% ethylene-vinyl acetate copolymer, 3.5% polyethylene glycol and 3.5% nonylphenol polyoxyethylene ether.

9. A method for preparing a composite oil-based wax remover and inhibitor, characterized in that: The following steps are involved: Step 1, adding toluene and xylene and stirring evenly, adding a wax inhibitor, and heating until completely dissolved to obtain a mixture; Step 2, adding light medium oil to the mixture, stirring and adding a wetting dispersant, and preparing a compound oil-based wax remover and inhibitor after the mixture is completely dissolved.

10. The method for preparing a composite oil-based wax removing and preventing agent according to claim 9, characterized in that: In step 1, the heating temperature is 20 to 100°C.