Paraffin-control reverse demulsifier as well as preparation method and use method thereof

Abstract

The invention discloses a wax-proof reverse demulsifier and a preparation method and a use method thereof, and the wax-proof reverse demulsifier comprises a block polyether nonionic surfactant and fatty alcohol polyoxyethylene ether sulfate, the problems that in an oil field, a water-based paraffin inhibitor and a reverse demulsifier need to be used in high-water-content produced liquid at the same time, the total dosage is large, and the dosage cost is high are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield oil production, gathering, transportation and processing, and in particular to a pharmaceutical agent having anti-wax and reverse phase demulsification effects and a preparation and use method thereof, which is suitable for the production, gathering, transportation and processing of paraffin-based crude oil water flooding and polymer flooding produced liquid. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] The wax content of crude oil in major oil fields in my country is relatively high, generally between 15% and 37%, and the wax content of some crude oil is as high as 40% or more. During the crude oil production process, due to the reduction of pressure and temperature and the escape of light components, the wax components in the waxy crude oil crystallize and precipitate to form wax crystals. The wax crystals are adsorbed on the wall of the oil pipe and the surface of the sucker rod in the form of thin flakes or needles, and are continuously deposited. This phenomenon is called wax deposition. Waxing can lead to a decrease in oil well production, and even cause production suspension due to wax sticking and other reasons. Waxing removal is difficult, costly, and affects production efficiency. Therefore, wax inhibitors are currently used in production to prevent wax deposition. The working principle of wax inhibitors is to reduce the deposition of paraffin crystals by adding chemicals to the produced fluid.

[0004] At present, most of my country's oil fields have entered the middle and late stages of development, and the comprehensive water content of produced fluids has reached about 80%, and some have even exceeded 90%. For produced fluids with medium and high water contents, surfactant-type paraffin inhibitors are mainly used; for example, Daqing Oilfield adds water-soluble or water-dispersible surfactant-type paraffin inhibitors to the bottom of the oil well to increase the stability of the produced crude oil emulsion and form a hydrophilic film on the internal surfaces of equipment such as oil pipes, sucker rods, oil pumps and gathering pipelines to prevent the deposition of paraffin, achieving a good effect of no need to clean wax within a pump inspection cycle, but there is a problem of a large amount of water-based paraffin inhibitor added; and as the comprehensive water content of the produced fluid increases, an O / W emulsion is formed, so it is also necessary to add a reverse demulsifier; the water-based paraffin inhibitor and the reverse demulsifier are added at the same time, the overall dosing cost is high, and the management is difficult.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may contain information that does not constitute prior art. Summary of the invention

[0006] In view of this, the present invention provides a wax inhibitor reverse demulsifier to solve the problem that a water-based wax inhibitor and a reverse demulsifier need to be used simultaneously in produced fluids with medium and high water contents, and the overall dosage of the agents is large and the cost of the agents is high.

[0007] In addition, the present disclosure also provides a preparation and use method of the wax-proof reverse demulsifier.

[0008] In the first aspect, the anti-wax inverse demulsifier comprises:

[0009] Block polyether nonionic surfactants and fatty alcohol polyoxyethylene ether sulfates.

[0010] In the present disclosure and possible embodiments, the block polyether nonionic surfactant is polyoxyethylene polyoxypropylene polyoxyethylene higher alcohol ether;

[0011] The fatty alcohol polyoxyethylene ether sulfate is fatty alcohol polyoxyethylene ether sodium sulfate.

[0012] In the present disclosure and some possible embodiments, the anti-wax reverse demulsifier further comprises:

[0013] Water and solvents;

[0014] The solvent is an alcohol solvent.

[0015] In the present disclosure and possible some embodiments, the solvent is methanol.

[0016] In the present disclosure and some possible embodiments, the mass proportion of the polyoxyethylene polyoxypropylene polyoxyethylene high-carbon alcohol ether is 10% to 30%, the mass proportion of the fatty alcohol polyoxyethylene ether sodium sulfate is 5% to 20%, the mass proportion of the solvent is 0% to 20%, and the balance is water.

[0017] In a second aspect, a method for preparing the anti-wax reverse demulsifier described in the first aspect comprises:

[0018] The block polyether nonionic surfactant and fatty alcohol polyoxyethylene ether sulfate are uniformly dispersed in a mixed solution of solvent and water to obtain the anti-wax reverse demulsifier.

[0019] In a third aspect, a method for using the anti-wax reverse demulsifier described in the first aspect comprises:

[0020] The concentration of the anti-wax reverse demulsifier added to the produced liquid is 3mg / L to 100mg / L.

[0021] The present disclosure has the following beneficial effects:

[0022] The wax-proof reverse demulsifier disclosed in the present invention is added to the produced liquid with high water content and then mixed by the oil pump, so that the produced liquid forms an O / W type produced liquid that is stable at a high shear rate. At the same time, the agent forms a hydrophilic film on the inner surface of equipment such as oil pipes and gathering pipelines, so that wax crystals and condensed oil precipitated at low temperature cannot be deposited on the pipe wall, thereby avoiding the wax deposition and condensed oil clogging the pipe in the oil pipe; the hydrophilic film can also reduce the friction resistance between the crude oil in the produced liquid and the pipe wall; when the produced liquid enters the three-phase separator or the free water remover, the flow rate of the produced liquid is reduced, and the shear rate of the produced liquid is reduced accordingly, and the reverse demulsification function of the agent comes into play, promoting the aggregation and fusion of oil droplets in the produced liquid, realizing the rapid removal of free water and improving the water quality of the discharged water; by using the wax-proof reverse demulsifier of the present invention, the wax crystals and condensed oil precipitated at low temperature are prevented from being deposited on the inner wall of the oil pipe and the gathering pipeline, and the purpose of eliminating the need for wax cleaning and avoiding the clogging of the pipeline by condensed oil in the low-temperature gathering and transportation process is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0024] Figure 1 1 is a comparison chart of the anti-wax effect of the anti-wax reverse demulsifier of Example 1 of the present disclosure and the anti-wax effect of the comparative example;

[0025] Figure 2 1 is a comparison chart of the anti-wax effect of the anti-wax reverse demulsifier of Example 2 of the present disclosure and the anti-wax effect of the comparative example;

[0026] Figure 3 It is a comparison chart of the anti-wax effect of the anti-wax reverse demulsifier of Example 3 of the present disclosure and the anti-wax effect of the comparative example. DETAILED DESCRIPTION

[0027] The present disclosure is described below based on embodiments, but it is worth noting that the present disclosure is not limited to these embodiments. In the detailed description of the present disclosure below, some specific details are described in detail. However, for the parts that are not described in detail, those skilled in the art can also fully understand the present disclosure.

[0028] In addition, those skilled in the art should understand that the drawings are only provided to illustrate the purpose, features and advantages of the present disclosure, and the drawings are not actually drawn to scale.

[0029] At the same time, unless the context clearly requires otherwise, the words "include", "comprises" and similar words throughout the specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0030] Example 1

[0031] The anti-wax reverse demulsifier of Example 1 of the present disclosure was applied to the Gulong shale oil 1# test area of ​​Daqing Oilfield to test its reverse demulsification and anti-wax effects.

[0032] The oil-bearing area of ​​the 1# test area of ​​Gulong shale oil in Daqing Oilfield is 3.4km 2 The reservoir depth is 2560m. The production method is to spray after pressure is reduced and then install the machine. The density of Gulong shale oil is 781~814kg / m 3 , wax content 19~37.4%, gum content 2.0~3.3%, 50℃ kinematic viscosity 2.3~7.3mm 2 / s, wax precipitation point 46 ~ 54 ℃, solidification point 4 ~ 18 ℃, with high wax content, high wax precipitation point, low density and viscosity, temperature between the wax precipitation point and the solidification point is prone to wax precipitation and lead to solid-liquid phase separation.

[0033] The wax-proof reverse demulsifier No. 1 of this embodiment 1 was prepared, and the weight proportion of its components was 15% of polyoxyethylene polyoxypropylene polyoxyethylene higher alcohol ether (SP-169), 15% of fatty alcohol polyoxyethylene ether sodium sulfate AES, 10% of methanol, and 60% of water.

[0034] The preparation method is as follows: according to the above components and mass proportions, a predetermined amount of water is added into a container; a predetermined amount of solvent methanol is added under continuous stirring, and stirring is continued until the mixture is uniform; a predetermined amount of block polyether nonionic surfactant polyoxyethylene polyoxypropylene polyoxyethylene higher carbon alcohol ether (SP-169) is added under continuous stirring, and stirring is continued until the mixture is uniform; a predetermined amount of fatty alcohol polyoxyethylene ether sodium sulfate AES is added under continuous stirring, and stirring is continued until the mixture is uniform to obtain the anti-wax reverse demulsifier.

[0035] The gathering and transportation process of the high-water content produced fluid from the Gulong shale oil No. 1 test area comprises the following steps:

[0036] Step 1, adding anti-wax reverse demulsifier No. 1 to the produced fluid of shale oil well with a water content greater than 70% in the oil gathering pipeline at the wellhead, the produced fluid after adding the drug enters the metering room through the gathering pipeline to measure the liquid volume, and then transfers to the manifold and is transported to the processing station;

[0037] Step 2: After arriving at the processing station, the shale oil produced fluid enters the two-stage four-in-one processing device in turn for dehydration, and the dehydrated shale oil and separated produced water are transported out.

[0038] The produced fluid of GY1-Q3-H2 well in Gulong shale oil No. 1 test area was used as the medium to prepare simulated shale oil produced fluid with a water content of 70%. The wax removal and wax prevention tester was used to evaluate the wax prevention rate of the agent, referring to the method specified in the standard "SY / T6300-2009 Wax Removal and Preventive Agent for Oil Production". The specific parameters are: the dosage of wax-removal reverse demulsifier No. 1 is 22 mg / L (calculated as effective substance, consistent with the dosage of the produced fluid on site), the preheating and initial temperature is 50°C (consistent with the actual temperature of the produced fluid wellhead), the final cooling temperature is 15°C (the standard freezing point of the pure oil sample of the well + 1°C), the stirring speed is 600r / min, the cooling rate is 0.15~0.3°C / min, and the temperature is kept constant for 2 minutes after reaching the final cooling temperature, the stirring is stopped, and the inverted cup is rotated for 5 minutes.

[0039] Take the produced fluid of GY1-Q3-H2 well, refer to the method specified in the standard "SY / T6300-2009 Wax Removal and Preventive Agent for Oil Production", and use a wax removal and prevention tester to evaluate the wax prevention rate of the agent. The specific steps and parameters are: take 2 glass bottles with a capacity of 250mL, add 0.4mL (prepared with distilled water at a concentration of 1wt%) of the wax prevention reverse demulsifier No. 1 disclosed in the present invention to one of the bottles, and the dosage concentration is 6mg / kg based on the effective matter, and the other bottle is blank. First, add 140g of produced water separated from the produced fluid of GY1-Q3-H2 well, and shake manually for 20 times; then add 60g of low-water crude oil separated from the produced fluid of GY1-Q3-H2 well, and keep the temperature in a 40℃ water bath for 30min; take out the glass bottle, shake it on the shaker at a frequency of 300r / min for 1min, and quickly transfer the oil-water emulsion to the experimental cup of the anti-wax tester that has been kept at a constant temperature of 40℃, and start the experiment, with a starting temperature of 40℃, a final cooling temperature of 25℃, a stirring speed of 600r / min, a cooling rate of 0.15~0.3℃ / min, and keep the temperature constant for 2min after reaching the final cooling temperature, stop stirring, and rotate the inverted cup for 5min. Accurately weigh and calculate the mass of the oil sample and the amount of wax and condensed oil sticking to the wall measured in the test cup, calculate the anti-wax rate of anti-wax reverse demulsifier No. 1, and evaluate the anti-wax effect of the agent.

[0040] During this period, only the produced fluid from this well entered the test station of Gulong Shale Oil No. 1 Test Area. Therefore, samples can be taken directly from the oil and water outlets outside the test station. According to GB / T 8929 "Determination of Water Content of Crude Oil by Distillation Method" and SY / T 0530 "Determination of Oil Content in Oilfield Wastewater by Spectrophotometry", the water content of the oil phase and the oil content of the water phase after demulsification are determined to evaluate the reverse phase demulsification effect of the agent.

[0041] Take two glass bottles with a capacity of 150mL, add 0.1mL (1wt% concentration prepared with distilled water) of anti-wax reverse demulsifier No. 1 to one of the bottles, and the dosage concentration is 3mg / L according to the effective substance, and the other bottle is blank. Take 100mL of the produced fluid from the GY1-Q3-H2 well, shake it manually 100 times, and let it stand at room temperature for sedimentation; after 30 minutes, turn the formula bottle upside down once, let it stand for 1 minute, and then use a syringe to take 40mL of water sample from the bottom of the glass formula bottle to test its oil content in the water phase.

[0042] The test results of the wax prevention rate, water content of the oil phase after demulsification and oil content of the water phase of the produced fluid of GY1-Q3-H2 well in Gulong shale oil No. 1 test area determined by the above method are shown in Figure 1 .

[0043] Depend on Figure 1 It can be seen that the addition of anti-wax reverse demulsifier No. 1 at a dosage of 22 mg / L (calculated as effective substance) has an obvious anti-wax effect on the produced fluid of GY1-Q3-H2 well in the Gulong shale oil No. 1 test area. During the test, it was found that when the blank sample was inverted, the shale oil in the simulated produced fluid was in the form of large oil blocks, and when the sample with anti-wax reverse demulsifier was inverted, the simulated produced fluid was a relatively uniform emulsion, and the measured anti-wax rate was 75.9%; the tracking monitoring results in the No. 1 test area showed that the produced fluid was treated with two-stage four-in-one treatment with the anti-wax reverse demulsifier No. 1, and the water content of the water phase was 0.2%, and the oil content of the water phase was 181 mg / L, both of which met the index requirements specified in relevant production and quality standards.

[0044] If the agent is added according to the background technology, the added concentration (calculated as effective substance) is greater than 200 mg / L. Although a good demulsification function can be achieved, it does not have an anti-wax function and it is difficult to ensure that there will be no clogging problem after long-term use.

[0045] The anti-wax reverse demulsifier No. 1 of Example 1 of the present disclosure is added to the produced fluid with high water content during the crude oil gathering and transportation process. It reduces the flow resistance of the produced fluid during the oil gathering process, ensures the free water removal effect, and also prevents wax deposition on the inner wall of the oil gathering pipeline, paraffin deposition, and condensed oil from clogging the pipeline. It also improves the water discharge quality in the subsequent produced fluid treatment process. At the same time, the added concentration is much lower than the original agent used.

[0046] Example 2

[0047] The wax-proof reverse demulsifier disclosed in the present invention was applied to the La 381 oil transfer station of the Sixth Oil Production Plant of Daqing Oilfield to test its application effect.

[0048] The wax-proof reverse demulsifier No. 2 of Example 2 of the present disclosure has components in the following weight ratios: AES 10%, SP-169 20%, methanol 10%, and water 60%.

[0049] Take two glass square bottles with a capacity of 150mL, add 0.1mL (prepared with distilled water at a concentration of 1wt%) of anti-wax reverse demulsifier No. 2 to one of the bottles, and add a concentration of 3mg / L according to the effective substance, and the other bottle is blank. Take 100mL of fresh (water-driven) produced liquid from the La 381 oil transfer station of the Sixth Oil Production Plant of Daqing Oilfield, manually shake it 100 times, and let it stand at room temperature for sedimentation; after 30 minutes, turn the formula bottle upside down once, let it stand for 1 minute, and use a syringe to take 40mL of water sample from the bottom of the glass formula bottle to test its water phase oil content. The indoor test results show that after adding the anti-wax reverse demulsifier No. 2 disclosed in the present invention, the oil content in the wastewater after oil-water separation of the produced liquid is reduced from 3929mg / L of the blank to 190mg / L, and the anti-wax reverse demulsifier No. 2 disclosed in the present invention has a good reverse demulsification effect.

[0050] Take the fresh (water drive) produced fluid of La 381 oil transfer station of the sixth oil production plant of Daqing Oilfield, refer to the method specified in the standard of "SY / T6300-2009 Wax Removal and Preventive Agent for Oil Production", and use a wax removal and prevention tester to evaluate the wax prevention rate of the agent. The specific steps and parameters are: take 2 glass bottles with a capacity of 250mL, add 0.4mL (prepared with distilled water at a concentration of 1wt%) of the wax prevention reverse demulsifier No. 2 of the present invention to one of the bottles, and the dosage concentration is 6mg / L according to the effective matter, and the other bottle is blank. First, add 140g of produced water separated from the produced fluid of the La 381 oil transfer station of the Sixth Oil Production Plant of Daqing Oilfield, and shake manually for 20 times; then add 60g of low-water crude oil separated from the produced fluid of the La 381 oil transfer station of the Sixth Oil Production Plant of Daqing Oilfield, and keep the temperature in a 40℃ water bath for 30min; take out the glass bottle, shake it on the shaker at a frequency of 300r / min for 1min, and then quickly transfer the oil-water emulsion to the experimental cup of the wax prevention tester that has been kept at a constant temperature of 40℃, and start the experiment, with a starting temperature of 40℃, a final cooling temperature of 25℃, a stirring speed of 600r / min, a cooling rate of 0.15~0.3℃ / min, and keep the temperature constant for 2min after reaching the final cooling temperature, stop stirring, and rotate the inverted cup for 5min. Accurately weigh and calculate the mass of the oil sample and the amount of wax and condensed oil sticking to the wall measured in the test cup, and calculate the wax prevention rate of the wax prevention reverse demulsifier.

[0051] Indoor test results (see Figure 2 ) showed that after adding the wax-proof reverse demulsifier No. 2 of the present invention, the amount of wax and condensed oil sticking to the wall was reduced by 67.5%, which had a good effect of preventing wax and condensed oil from sticking to the wall compared with the blank.

[0052] Experiments show that adding 6 mg / L of anti-wax reverse demulsifier to the produced fluid of La 381 oil transfer station can simultaneously achieve good free water removal effect and prevent paraffin or condensed oil deposition effect; the original dosing concentration of anti-wax agent in this block was 6 mg / L, and the dosing concentration of the first-stage demulsifier was 5 mg / L. The use of anti-wax reverse demulsifier significantly reduced the total dosing concentration.

[0053] Example 3

[0054] The wax-proof reverse demulsifier disclosed in the present invention was applied to the 208 oil transfer station in the first oil production plant of Daqing Oilfield to test its application effect.

[0055] The anti-wax reverse demulsifier No. 3 disclosed in the present invention is prepared, and its components by weight are 25% AES, 5% SP-169, 10% methanol, and 60% water.

[0056] Take two glass formula bottles with a capacity of 150mL, add 0.25mL (prepared with distilled water at a concentration of 1wt%) of anti-wax reverse demulsifier No. 3 to one of the bottles, and add a concentration of 7.5mg / L according to the effective substance, and the other bottle is blank. Take 100mL of the produced liquid (polymer drive, produced liquid water phase polymer content 634mg / L) from the 208 oil transfer station in the first oil production plant of Daqing Oilfield, manually shake 100 times, and let it stand at room temperature for sedimentation; after 30min, turn the formula bottle upside down once, let it stand for 1min, and use a syringe to take 40mL of water sample from the bottom of the glass formula bottle to test its water phase oil content. The indoor test results show that after adding the anti-wax reverse demulsifier No. 3 of the present invention, the oil content in the wastewater after oil-water separation of the produced liquid is reduced from 758mg / L of the blank to 167mg / L, and the agent has a good reverse demulsification effect.

[0057] Take the produced fluid of 208 ternary oil transfer station in the first oil production plant of Daqing Oilfield (actually polymer flooding, the polymer content of the produced fluid water phase is 634mg / L), refer to the method specified in the standard "SY / T6300-2009 Wax Removal and Preventive Agent for Oil Production", and use the wax removal and prevention tester to evaluate the wax prevention rate of the agent. The specific steps and parameters are: take 2 glass bottles with a capacity of 250mL, add 1.0mL (prepared with distilled water at a concentration of 1wt%) wax prevention reverse demulsifier No. 3 to one of the bottles, and add the concentration of 15mg / L according to the effective matter, and the other bottle is blank. First, add 140g of produced water separated from the produced fluid of 208 Sanyuan oil transfer station in the first oil production plant of Daqing Oilfield, and shake manually for 20 times; then add 60g of low-water crude oil separated from the produced fluid of 208 Sanyuan oil transfer station in the first oil production plant of Daqing Oilfield, and keep the temperature in a 40℃ water bath for 30min; take out the glass bottle, shake it on the shaker at a frequency of 300r / min for 1min, and then quickly transfer the oil-water emulsion to the experimental cup of the wax prevention tester which has been kept at a constant temperature of 40℃, and start the experiment, with a starting temperature of 40℃, a final cooling temperature of 25℃, a stirring speed of 600r / min, a cooling rate of 0.15~0.3℃ / min, and keep the temperature constant for 2min after reaching the final cooling temperature, stop stirring, and rotate the inverted cup for 5min. Accurately weigh and calculate the mass of the oil sample and the amount of wax and condensed oil sticking to the wall measured in the test cup, and calculate the wax prevention rate of the wax prevention reverse demulsifier.

[0058] Indoor test results (see Figure 3 ) showed that after adding the wax-proof reverse demulsifier No. 3 of the present invention, the amount of wax and condensed oil sticking to the wall was reduced by 60.1%, which had a good effect of preventing wax and condensed oil from sticking to the wall compared with the blank.

[0059] Experiments show that adding 7.5 mg / L of anti-wax reverse demulsifier to the produced fluid of the Zhong 208 oil transfer station can simultaneously achieve good free water removal effects and prevent paraffin or condensed oil deposition effects; the original dosing concentration of the anti-wax agent in this block was 7 mg / L, and the dosing concentration of the first-stage demulsifier was 5 mg / L. The use of anti-wax reverse demulsifier significantly reduced the total dosing concentration.

[0060] It can be seen from the application effects of the above-mentioned Examples 1-3 that adding the anti-wax reverse demulsifier to the produced liquid with high water content can make the produced liquid form an O / W type crude oil emulsion that is more stable at high shear rates. The anti-wax reverse demulsifier can also be adsorbed on the inner wall of the oil pipe and the gathering pipeline to form a hydrophilic film. Since the viscosity of water as the external phase is much lower than the viscosity of crude oil, and the presence of the hydrophilic film, the flow resistance of the oil production and gathering process can be significantly reduced; and since the hydrophilic film exists on the inner wall of the oil pipe and the gathering pipeline, the wax crystals and condensed oil precipitated at low temperature are difficult to be adsorbed on the inner wall of the equipment, thus avoiding the problem of wax deposition in the oil pipe and condensed oil blocking the gathering pipeline at low temperature. Based on the same principle, the oil production and gathering temperature of the produced liquid can be appropriately reduced, so the water mixing temperature or water mixing amount can be reduced for the water mixing process, and the heating power can also be reduced for the electric heating tracing process, so as to achieve the effect of energy saving and consumption reduction.

[0061] The anti-wax reverse demulsifier can promote the aggregation and coalescence of oil droplets in high-water-content produced fluid at a low shear rate. When the produced fluid enters a three-phase separator or a free water remover, the shear rate to which the produced fluid is subjected is reduced due to the reduction in the flow rate of the produced fluid. The reverse demulsification function of the agent takes effect, promoting the aggregation and coalescence of oil droplets in the produced fluid, thereby accelerating the oil-water separation rate of the produced fluid, reducing the residual crude oil content in the wastewater, and improving the water quality of the discharged water.

[0062] The anti-wax reverse demulsifier plays the role of preventing wax, reducing drag and preventing clogging in the wellbore and gathering pipeline. When entering the three-phase separator or the free water remover with the produced liquid, it also plays the role of promoting the removal of free water and improving the water discharge quality. The anti-wax reverse demulsifier of the present invention has the dual role of the anti-wax agent and the reverse demulsifier, and its dosage is equivalent to that of the conventional reverse demulsifier, and is significantly reduced compared with the sum of the dosages of the anti-wax agent and the reverse demulsifier. Therefore, the dosage cost can be significantly reduced, and the difficulty of dosage management can be reduced.

[0063] The above-described embodiments are only embodiments of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present disclosure. It should be noted that, for a person of ordinary skill in the art, without departing from the concept of the present disclosure, several variations, equivalent substitutions, improvements, etc. may be made, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the attached claims.

Claims

1. A wax-proof reverse demulsifier, characterized in that: include: Block polyether nonionic surfactants and fatty alcohol polyoxyethylene ether sulfates.

2. The wax-proof inverse demulsifier according to claim 1, characterized in that: The block polyether nonionic surfactant is polyoxyethylene polyoxypropylene polyoxyethylene higher carbon alcohol ether; The fatty alcohol polyoxyethylene ether sulfate is fatty alcohol polyoxyethylene ether sodium sulfate.

3. The wax-proof inverse demulsifier according to claim 2, characterized in that: Also includes: Water and solvents; The solvent is an alcohol solvent.

4. The wax-proof inverse demulsifier according to claim 3, characterized in that The alcohol solvent is methanol.

5. The wax-proof inverse demulsifier according to claim 4, characterized in that: The mass proportion of the polyoxyethylene polyoxypropylene polyoxyethylene higher alcohol ether is 10% to 30%, the mass proportion of the fatty alcohol polyoxyethylene ether sodium sulfate is 5% to 20%, the mass proportion of the solvent is 0% to 20%, and the balance is water.

6. The method for preparing the wax-proof reverse demulsifier according to claim 3, 4 or 5, characterized in that: include: The block polyether nonionic surfactant and fatty alcohol polyoxyethylene ether sulfate are uniformly dispersed in a mixed solution of solvent and water to obtain the anti-wax reverse demulsifier.

7. The method for using the wax-proof inverse demulsifier according to any one of claims 1 to 5, characterized in that: include: The concentration of the anti-wax reverse demulsifier added to the produced liquid is 3mg / L to 100mg / L.

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