Device and method for measuring paraffin inhibition rate of paraffin inhibitor

Abstract

The invention discloses a device and a method for measuring the paraffin inhibition rate of a paraffin inhibitor. The device comprises a jacketed container, a cold finger cylinder, a high-temperature constant-temperature circulating water bath kettle and a low-temperature constant-temperature circulating water bath kettle, the cold finger cylinder is arranged in the jacketed container in a sealed mode, a sealed cavity is formed between the outer wall of the cold finger cylinder and the inner wall of the jacketed container, and the sealed cavity is communicated with one end of a high-temperature circulating water bath kettle water inlet and one end of a high-temperature circulating water bath water outlet. The other ends of the high-temperature circulating water bath kettle water inlet and the high-temperature circulating water bath water outlet are connected with the high-temperature constant-temperature circulating water bath kettle; the cold finger cylinder is respectively communicated with one end of a low-temperature circulating water bath water inlet and one end of a low-temperature circulating water bath water outlet; and the other ends of the low-temperature circulating water bath water inlet and the low-temperature circulating water bath water outlet are connected with the low-temperature constant-temperature circulating water bath kettle. The paraffin inhibition rate of the paraffin inhibitor can be rapidly and effectively tested.

Description

Technical Field

[0001] The invention belongs to the field of oilfield chemistry and relates to a device and a method for determining the wax prevention rate of a wax inhibitor. Background Art

[0002] Wax usually exists in liquid state under formation conditions. However, during the oil well production process, as the temperature and pressure drop and the light components continue to escape, the wax dissolving ability of crude oil decreases, and the wax begins to gradually precipitate and aggregate, and continuously deposits and clogs, directly affecting production. Chemical anti-wax technology is widely used because of its advantages such as low investment, simple operation, and the ability to significantly improve the wax deposition phenomenon in crude oil, and no need for post-processing. The anti-wax rate is an important criterion for evaluating the effectiveness of anti-wax agents. The existing anti-wax rate test standard for anti-wax agents, "SY / T6300-2009 Industry Analysis Method Standard", has complex equipment, high prices, and cumbersome operating procedures. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device and method for determining the wax prevention rate of a wax inhibitor, which can quickly and effectively test the wax prevention rate of a wax inhibitor, screen out wax inhibitors suitable for oil field production, solve the problem of wax deposition in oil wells, and reduce the harm caused by wax deposition to oil well production.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A wax inhibitor wax rate measuring device comprises a jacketed container, a cold finger tube, a high-temperature constant-temperature circulating water bath and a low-temperature constant-temperature circulating water bath;

[0006] The cold finger tube is sealed and arranged in the jacket container, and a sealed cavity is arranged between the outer wall of the cold finger tube and the inner wall of the jacket container, the sealed cavity is respectively connected with one end of the water inlet and the water outlet of the high-temperature circulating water bath, and the other end of the water inlet and the water outlet of the high-temperature circulating water bath is connected to the high-temperature constant-temperature circulating water bath, the cold finger tube is respectively connected with one end of the water inlet and the water outlet of the low-temperature circulating water bath, and the other end of the water inlet and the water outlet of the low-temperature circulating water bath is connected to the low-temperature constant-temperature circulating water bath.

[0007] Preferably, the top of the cold finger cylinder is sealed with a cold finger cover.

[0008] Preferably, a cold finger tube bracket is provided in the jacketed container, and the cold finger tube is hung on the cold finger tube bracket.

[0009] Preferably, the water inlet of the low-temperature circulating water bath is at a lower height than the water outlet of the low-temperature circulating water bath, and the water inlet of the high-temperature circulating water bath is at a lower height than the water outlet of the high-temperature circulating water bath.

[0010] Preferably, the jacketed container is an annular barrel, the cold finger tube seal is arranged in the inner ring of the jacketed container, and the outer ring of the jacketed container is respectively connected to one end of the water inlet of the high-temperature circulating water bath pot and the water outlet of the high-temperature circulating water bath.

[0011] A method for determining the wax resistance rate of a wax resistance agent based on the above device comprises the following steps:

[0012] Step 1, take waxy crude oil on site or use 0# diesel to prepare 25% standard paraffin solution for standby use, and then use 0# diesel to prepare 10% paraffin inhibitor solution for standby use;

[0013] Step 2, take the waxy crude oil in step 1 or use 0# diesel to prepare a 25% standard paraffin solution and store it in a jacketed container at a constant temperature for a set time;

[0014] Step 3, place the cold finger tube into the jacketed container, take out the cold finger tube after the set time and weigh the wax amount on it as the blank group;

[0015] Step 4, adding a certain amount of the wax inhibitor solution prepared in step 1 into the jacketed container, and measuring the amount of wax deposited after adding the wax inhibitor;

[0016] Step 5: Calculate the wax prevention rate of the wax inhibitor based on the wax precipitation amount of the blank group.

[0017] Preferably, the constant temperature storage time in step 2 is 35 to 40 minutes.

[0018] Preferably, when waxy crude oil is used in step 2, the constant temperature storage temperature is 40±5°C, and when 0# diesel is used to prepare a 25% standard paraffin solution, the constant temperature storage temperature is 0±5°C.

[0019] Preferably, in step 3, the temperature of the cold finger tube is 10±1° C. lower than the temperature of the jacketed container.

[0020] Preferably, in step 5, the calculation formula of the wax resistance rate is: X1=(m1-m2) / m1×100%;

[0021] In the formula: X1 is the anti-wax rate, m1 is the wax content of the blank wax-containing solution, and m2 is the wax content of the wax-containing solution after adding the anti-wax agent.

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

[0023] The invention uses the temperature difference between a low-temperature constant-temperature circulating water bath and a high-temperature constant-temperature circulating water bath to naturally form wax on a cold finger tube, simulating a natural wax formation process, and the experimental result is accurate and feasible. The equipment is simple, the cost is low, the steps are simple, and the wax prevention rate of the wax inhibitor can be quickly and effectively measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a planed surface diagram of the simple tester for wax resistance rate of wax resist agent of the present invention;

[0025] Figure 2 It is a structural schematic diagram of a simple tester for the wax resistance rate of wax resistance agent of the present invention;

[0026] Figure 3 It is a jacketed container of the simple tester for the wax prevention rate of the wax prevention agent of the present invention;

[0027] Figure 4 It is a cold finger tube of the simple tester for the wax resistance rate of the wax resistance agent of the present invention;

[0028] Figure 5 It is a cold finger tube support of the simple tester for the wax resistance rate of the wax resistance agent of the present invention;

[0029] Figure 6 The utility model relates to a cold finger cover of the simple tester for the wax preventing agent wax preventing rate of the invention.

[0030] In the figure, 1-jacketed container, 2-cold finger tube, 3-cold finger tube bracket, 4-cold finger cover, 5-high temperature circulating water bath water inlet, 6-high temperature circulating water bath water outlet, 7-low temperature circulating water bath water inlet, 8-low temperature circulating water bath water outlet, 9-sealing ring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] like Figure 1-6 As shown, the wax inhibitor wax inhibition rate measuring device of the present invention comprises a jacketed container 1, a cold finger tube 2, a cold finger tube bracket 3, a cold finger cover 4, a high-temperature constant-temperature circulating water bath, a low-temperature constant-temperature circulating water bath and a sealing ring 9.

[0035] The top of the cold finger tube 2 is threadedly connected or snap-fitted with a cold finger cover 4 for sealing, and a sealing ring 9 is used to seal the cold finger tube 2 and the cold finger cover 4 .

[0036] The jacketed container 1 is an annular barrel, and the internal cavity of the jacketed container 1 is divided into an outer ring and an inner ring, which are sealed and isolated. The cold finger tube 2 is sealed and arranged in the inner ring of the jacketed container 1, and a cold finger tube bracket 3 is arranged on the top of the inner ring. The cold finger tube bracket 3 extends into the inner ring of the jacketed container 1, and the cold finger tube 2 is hung on the cold finger tube bracket 3. The outer ring of the jacketed container 1 is respectively connected to one end of the high-temperature circulating water bath water inlet 5 and the high-temperature circulating water bath water outlet 6, and the other ends of the high-temperature circulating water bath water inlet 5 and the high-temperature circulating water bath water outlet 6 are connected to the high-temperature constant temperature circulating water bath.

[0037] The water inlet 5 of the high-temperature circulating water bath is lower than the water outlet 6 of the high-temperature circulating water bath. The water inlet 5 of the high-temperature circulating water bath is located near the bottom of the jacketed container 1, and the water outlet 6 of the high-temperature circulating water bath is located near the top of the jacketed container 1.

[0038] The cold finger tube 2 is connected to one end of the low-temperature circulating water bath inlet 7 and the low-temperature circulating water bath outlet 8 respectively, and the other ends of the low-temperature circulating water bath inlet 7 and the low-temperature circulating water bath outlet 8 are connected to a low-temperature constant-temperature circulating water bath pot.

[0039] The low-temperature circulating water bath inlet 7 is lower than the low-temperature circulating water bath outlet 8, the low-temperature circulating water bath inlet 7 is located near the bottom of the cold finger tube 2, and the low-temperature circulating water bath outlet 8 is located near the top of the cold finger tube 2.

[0040] The method for determining the wax prevention rate of the wax inhibitor comprises the following steps: 1) taking waxy crude oil on site or preparing a 25% standard paraffin solution with 0# diesel for standby use, and then preparing a 10% wax inhibitor solution with 0# diesel for standby use; 2) taking 100g of the waxy crude oil in the step or preparing a 25% standard paraffin solution with 0# diesel for standby use in a jacketed container 1 and keeping it at a constant temperature for 35 to 40 minutes. When the waxy crude oil is used, the temperature of the constant temperature storage is 40±5°C, and when the 25% standard paraffin solution is prepared with 0# diesel, the temperature of the constant temperature storage is 0±5°C; 3) placing a cold finger tube 2 in the jacketed container 1, the temperature of the cold finger tube 2 is 10±1°C lower than the temperature of the jacketed container 1, and taking out the cold finger tube 2 after 1 hour to weigh the wax accumulation on it as a blank group; 4) adding a certain amount of the wax inhibitor solution prepared in the step into the jacketed container 1 at the same time, and measuring the wax accumulation after adding the wax inhibitor; 5) taking the wax precipitation amount of the blank group as a benchmark, calculating the wax prevention rate of the wax inhibitor, and the wax prevention rate is calculated as follows:

[0041] X1=(m1-m2) / m1×100%,

[0042] Where: X1—wax resistance rate, %.

[0043] m1—wax content of blank wax-containing solution, g.

[0044] m2—The amount of wax deposited in the wax-containing solution after adding anti-wax agent, g.

[0045] One jacketed container 1 and cold finger cylinder 2 can be used to carry out wax deposition experiments of a blank group and an experimental group successively, or two sets of jacketed containers 1 and cold finger cylinders 2 can be used to carry out wax deposition experiments of a blank group and an experimental group respectively.

[0046] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the beneficial effects of the present invention are illustrated below by comparing the data obtained by the wax resistance rate determination method of the present invention with that of the existing standard "SY / T6300-2009 Industry Analysis Method Standard".

[0047] Example 1

[0048] A specific implementation of the present invention comprises the following steps:

[0049] 1) Use 0# diesel to dissolve a certain amount of standard paraffin for later use, with the mass fraction of paraffin being 25%;

[0050] 2) Use 0# diesel to dissolve a certain amount of solid wax inhibitor for standby use, with the mass fraction of the solid wax inhibitor being 10%;

[0051] 3) Take two jacketed containers 1 and add 100±1g of the waxy diesel solution prepared in the step, add a certain amount of the anti-wax solution prepared in the step to one of the containers, and add 0# diesel to the other container as a blank group, mix well, and place the container in a constant temperature circulating water bath at 40°C for 35 minutes;

[0052] 4) The tester is set to a temperature difference of 10°C, the temperature of the high-temperature circulating water bath is set to 40°C, and the temperature of the low-temperature circulating water bath is set to 30°C. The cold finger is inserted into the wax-containing solvent, and the wax precipitation amount is measured at intervals of 1h. The wax precipitation amount of the blank group is recorded as m1, and the wax precipitation amount of the wax inhibitor solution is recorded as m2;

[0053] 5) Using the wax precipitation amount of the blank group as a benchmark, calculate the wax prevention rate of the wax inhibitor.

[0054] The existing standard "SY / T6300-2009 Industry Analysis Method Standard" measures the wax resistance rate of wax inhibitors as follows:

[0055] 1) Use 0# diesel to dissolve a certain amount of standard paraffin for later use, with the mass fraction of paraffin being 25%;

[0056] 2) dissolving a certain amount of solid wax inhibitor in xylene for later use, wherein the mass fraction of the solid wax inhibitor is 10%;

[0057] 3) Take two formula bottles and add 100g±1g of the oil sample in the step respectively, one of which is used as a blank group, add a certain amount of the anti-wax solution in the step to one formula bottle, and add an equal amount of xylene to the other formula bottle, place the formula bottles in a constant temperature water bath at 60°C for 60 minutes, take out the formula bottles and shake them on an electric reciprocating shaker for 10 minutes, then move them to a water bath at 40°C for 60 minutes;

[0058] 4) Set the temperature of the water bath of the wax cleaning and wax prevention tester to 40°C. After the temperature is reached, place the wax cleaning and wax prevention test cup on the tester and drop the stirring slurry into the test cup so that its lower end is 20 mm away from the bottom of the test cup. At the same time, set the final cooling temperature to 30°C on the control panel of the wax cleaning and wax prevention tester;

[0059] 5) After 5 minutes, pour the heat-treated oil samples in the two formula bottles into the test cup of the wax removal and anti-wax tester, and turn on the stirrer at a speed of 2000r / min+10r / min. The cooling rate during the test process is 1.0℃ / min;

[0060] 6) When the water bath temperature of the tester drops to the final cooling temperature, keep the temperature constant for 5 minutes and record the torque stability value of the last 20 seconds. Stop stirring, raise the stirring paddle, quickly take out the test cup and put it into the rotating cup inverting instrument. The rotating cup inverting instrument should be placed in a constant temperature box with the same final cooling temperature. Turn on the button, and the rotating cup inverting instrument will slowly and evenly pour out the oil sample in the test cup while rotating. Empty the test cup for 5 minutes and weigh it, and then subtract the mass of the empty test cup to get the wax deposition amount;

[0061] 7) Using the wax precipitation amount of the blank group as a benchmark, calculate the wax prevention rate of the wax inhibitor.

[0062] Wax resistance calculation formula: X1 = (m1-m2) / m1×100%

[0063] Where: X1—wax resistance rate, %;

[0064] m1—wax content of blank wax solution, g;

[0065] m2—the amount of wax deposited in the wax-containing solution after adding the anti-wax agent, g;

[0066] Table 1 Wax prevention test results of waxy diesel of the present invention

[0067]

[0068] Table 2 Experimental results of wax protection rate test of standard waxy diesel

[0069]

[0070] Example 2

[0071] The natural gas condensate from Tarim Oilfield was selected to measure the wax prevention rate of the wax inhibitor. The specific steps are as follows:

[0072] 1) Take natural gas condensate from Tarim Oilfield for standby use;

[0073] 2) Use 0# diesel to dissolve a certain amount of solid wax inhibitor for standby use, with the mass fraction of the solid wax inhibitor being 10%;

[0074] 3) Take two jacketed containers 1 and add 100±1g of Tarim Oilfield natural gas condensate in step 1 respectively, add a certain amount of the anti-wax solution prepared in step 2 to one of the containers, and add 0# diesel to the other container as a blank group, mix well, and place the container in a constant temperature circulating water bath at 0°C for 30 minutes;

[0075] 4) The tester is set to a temperature difference of 10°C, the temperature of the high-temperature circulating water bath is set to 0°C, and the temperature of the low-temperature circulating water bath is set to -10°C. The cold finger is inserted into the wax-containing solvent, and the wax precipitation amount is measured at intervals of 1h. The wax precipitation amount of the blank group is recorded as m1, and the wax precipitation amount of the wax inhibitor solution is recorded as m2;

[0076] 5) Using the wax precipitation amount of the blank group as a benchmark, calculate the wax prevention rate of the wax inhibitor.

[0077] The steps for measuring the wax resistance rate of wax resist agent using the existing standard "SY / T6300-2009 Industry Analysis Method Standard" are as follows:

[0078] 1) Take natural gas condensate from Tarim Oilfield for standby use;

[0079] 2) dissolving a certain amount of solid wax inhibitor in xylene for later use, wherein the mass fraction of the solid wax inhibitor is 10%;

[0080] 3) Take two formula bottles and add 100g±1g of the oil sample in step 1 respectively, one of which is used as a blank group. Add a certain amount of the anti-wax solution in step 2 to one formula bottle, and add an equal amount of xylene to the other formula bottle. Place the formula bottles in a constant temperature water bath at 20°C for 60 minutes. Take out the formula bottles and oscillate them on an electric reciprocating oscillator for 10 minutes, then move them to a 0°C water bath and keep the temperature for 60 minutes.

[0081] 4) Set the temperature of the water bath of the wax cleaning and wax prevention tester to 0°C. When the temperature is reached, place the wax cleaning and wax prevention test cup on the tester and drop the stirring paddle into the test cup so that its lower end is 20 mm from the bottom of the test cup. At the same time, set the final cooling temperature to -10°C on the control panel of the wax cleaning and wax prevention tester.

[0082] 5) After 5 minutes, pour the heat-treated oil samples in the two formula bottles into the test cup in the wax removal and anti-wax tester, and turn on the agitator at a speed of 2000r / min+10r / min. The cooling rate during the test process is 1.0℃ / min.

[0083] 6) When the water bath temperature of the tester drops to the final cooling temperature, keep the temperature constant for 5 minutes and record the torque stability value of the last 20 seconds. Stop stirring, raise the stirring paddle, quickly take out the test cup and put it into the rotating cup inverting instrument. The rotating cup inverting instrument should be placed in a constant temperature box with the same final cooling temperature. Turn on the button, and the rotating cup inverting instrument will slowly and evenly pour out the oil sample in the test cup while rotating. Empty the test cup for 5 minutes and weigh it, and then subtract the mass of the empty test cup to get the wax deposition amount.

[0084] 7) Using the wax precipitation amount of the blank group as a benchmark, calculate the wax prevention rate of the wax inhibitor.

[0085] Wax resistance calculation formula: X1 = (m1-m2) / m1×100%

[0086] Where: X1—wax resistance rate, %;

[0087] m1—wax content of blank wax solution, g;

[0088] m2—the amount of wax deposited in the wax-containing solution after adding the anti-wax agent, g;

[0089] Table 3 Experimental results of the wax prevention rate test of natural gas condensate in Tarim Oilfield of the present invention

[0090]

[0091] Table 4 Experimental results of standard Tarim Oilfield natural gas condensate wax prevention rate test

[0092]

[0093]

[0094] By comparing the measured data of the present invention with the standard, it can be seen that the simple tester and determination method for the wax resistance rate of the wax resistance agent of the present invention are indeed feasible, and are cheaper and simpler in steps than standard equipment.

[0095] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0096] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A wax inhibitor wax rate measuring device, characterized in that: It comprises a jacketed container (1), a cold finger tube (2), a high-temperature constant-temperature circulating water bath and a low-temperature constant-temperature circulating water bath; The cold finger tube (2) is sealed and arranged in the jacketed container (1); a sealed cavity is arranged between the outer wall of the cold finger tube (2) and the inner wall of the jacketed container (1); the sealed cavity is respectively connected to one end of a high-temperature circulating water bath water inlet (5) and a high-temperature circulating water bath water outlet (6); the other ends of the high-temperature circulating water bath water inlet (5) and the high-temperature circulating water bath water outlet (6) are connected to a high-temperature constant-temperature circulating water bath; the cold finger tube (2) is respectively connected to one end of a low-temperature circulating water bath water inlet (7) and a low-temperature circulating water bath water outlet (8); the other ends of the low-temperature circulating water bath water inlet (7) and the low-temperature circulating water bath water outlet (8) are connected to a low-temperature constant-temperature circulating water bath.

2. The wax inhibitor rate measuring device according to claim 1, characterized in that: The top of the cold finger tube (2) is sealed by a cold finger cover (4).

3. The wax inhibitor rate measuring device according to claim 1, characterized in that: A cold finger tube support (3) is arranged in the jacketed container (1), and the cold finger tube (2) is hung on the cold finger tube support (3).

4. The wax inhibitor rate measuring device according to claim 1, characterized in that: The height of the low-temperature circulating water bath water inlet (7) is lower than the low-temperature circulating water bath water outlet (8), and the height of the high-temperature circulating water bath pot water inlet (5) is lower than the high-temperature circulating water bath water outlet (6).

5. The wax inhibitor rate measuring device according to claim 1, characterized in that: The jacketed container (1) is an annular barrel, the cold finger tube (2) is sealed and arranged in the inner ring of the jacketed container (1), and the outer ring of the jacketed container (1) is respectively connected to the water inlet (5) of the high-temperature circulating water bath pot and one end of the water outlet (6) of the high-temperature circulating water bath.

6. A method for determining the wax resistance rate of a wax resistance agent based on the device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1, take waxy crude oil on site or use 0# diesel to prepare 25% standard paraffin solution for standby use, and then use 0# diesel to prepare 10% paraffin inhibitor solution for standby use; Step 2, taking the waxy crude oil in step 1 or using 0# diesel to prepare a 25% standard paraffin solution and storing it in a jacketed container (1) at a constant temperature for a set time; Step 3, placing the cold finger tube (2) into the jacketed container (1), taking out the cold finger tube (2) after a set time, and weighing the amount of wax deposited thereon as a blank group; Step 4, adding a certain amount of the wax inhibitor solution prepared in step 1 into the jacketed container (1), and measuring the amount of wax deposited after adding the wax inhibitor; Step 5: Calculate the wax prevention rate of the wax inhibitor based on the wax precipitation amount of the blank group.

7. The method for determining the wax resistance rate of a wax resist according to claim 6, wherein: The constant temperature storage time in step 2 is 35 to 40 minutes.

8. The method for determining the wax resistance rate of a wax resist according to claim 6, wherein: In step 2, when waxy crude oil is used, the constant temperature storage temperature is 40±5°C, and when 0# diesel is used to prepare a 25% standard paraffin solution, the constant temperature storage temperature is 0±5°C.

9. The method for determining the wax resistance rate of a wax inhibitor according to claim 6, wherein: In step 3, the temperature of the cold finger tube (2) is 10±1°C lower than the temperature of the jacketed container (1).

10. The method for determining the wax resistance rate of a wax resist according to claim 6, wherein: In step 5, the calculation formula of the wax resistance rate is: X1 = (m1-m2) / m1×100%; In the formula: X1 is the anti-wax rate, m1 is the wax content of the blank wax-containing solution, and m2 is the wax content of the wax-containing solution after adding the anti-wax agent.

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