Chemical sealing device for surface defects of pumping unit polished rod and construction process

Abstract

The present application relates to a kind of pumping unit polish rod surface defect chemical sealing device and construction technology.Mainly solve the problem of continuous corrosion due to the existing polish rod material itself has many defects.It is characterized in that: the polish rod processing tank is connected with steam generation system, surplus steam recovery system, oil removal agent circulating system, sealing agent circulating system, water circulating system.The construction technology includes: polish rod surface is treated by chemical sealing, the film-forming effect of sealing agent is used to fill and block the defect site, and the generation of various types of corrosion is terminated;before polish rod installation, sealing agent is pre-sealed by using sealing treatment device, and the polish rod after use can be extended by the way of adding sealing agent supplement liquid to extend the sealing effect, and long-term contact corrosion in defect area is eliminated.The pumping unit polish rod surface defect chemical sealing device and construction technology block the contact between polish rod base material and corrosive medium, and can ensure that polish rod can continue to be used, and can greatly extend the service life of polish rod.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of pumping unit technical field, especially, it relates to a kind of pumping unit polish rod surface defect chemical closure device and construction technology. BACKGROUND

[0002] In recent years, pumping unit polish rod surface corrosion leads to packing seal failure situation extremely serious, polish rod life is greatly reduced, replacement cycle shortens, to a certain extent, it influences the cost and efficiency of production, fundamentally find the cause of polish rod damage, and take control and prevent measures, to extend the running cycle of equipment, and reduce production cost, it is an effective method.

[0003] After the observation and analysis of the surface metallographic structure of more than 200 polish rod samples, it is proved that the forged polish rod material itself has many defects, mainly in that ordinary rod has small cracks in the forging stage, and the gap between the cracks cannot be effectively filled in the grinding stage;The surface of thermal spraying rod is not uniform, and part of the base material area cannot be covered by the alloy layer and is exposed to the air, resulting in the retention of produced liquid in the above-mentioned area, forming continuous corrosion effect (direct chemical corrosion, etc.). SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the problem of continuous corrosion caused by the defects in the existing polish rod material, and to provide a pumping unit polish rod surface defect chemical closure device. The pumping unit polish rod surface defect chemical closure device is used for repairing the polish rod with defects, blocking the contact between the polish rod base material and the corrosive medium, and ensuring that the polish rod can continue to be used. The present application also provides a construction technology using the pumping unit polish rod surface defect chemical closure device.

[0005] The purpose of the present application is to find the defects of the polish rod material and the micro factors causing the corrosion of the polish rod by analyzing the microstructure of the pumping unit polish rod, to repair the forging cracks, thermal spraying defects and other factors existing in the polish rod, to block the contact between the polish rod base material and the corrosive medium, and to avoid the contact corrosion damage caused by the long-term immersion of the defect area in the produced liquid.

[0006] The present application solves the problem by the following technical scheme: the pumping unit polish rod surface defect chemical closure device comprises a polish rod treatment tank, and the polish rod treatment tank is connected with a steam generating system, a surplus steam recovery system, an oil removing agent circulating system, a sealing agent circulating system and a clean water circulating system.

[0007] Preferably, the steam generating system comprises a steam generator, and the steam generator is connected with the polish rod treatment tank through a steam valve.

[0008] Preferably, the excess steam recovery system comprises an exhaust pipeline, which is connected to the steam recovery valve and the balance valve through an upper exhaust valve, the steam recovery valve is connected to the steam cooling recovery tank, and the balance valve is connected to the venting pipeline.

[0009] Preferably, the oil removal agent circulation system comprises an oil removal agent tank, the outlet end of the oil removal agent tank is connected to the polished rod treatment tank through an oil removal agent valve, the inlet end of the oil removal agent tank is connected to a riser pipeline leading to the bottom of the polished rod treatment tank through an oil removal agent recovery valve, the riser pipeline is connected to a chemical circulation pump, and the bottom of the polished rod treatment tank is connected to a liquid discharge valve.

[0010] Preferably, the sealing agent circulation system comprises a sealing agent tank, the outlet end of the sealing agent tank is connected to the polished rod treatment tank through a sealing agent filling valve, and the inlet end of the sealing agent tank is connected to a riser pipeline leading to the bottom of the polished rod treatment tank through a sealing agent backflow valve.

[0011] Preferably, the clean water circulation system comprises a clean water circulation tank, the outlet end of the clean water circulation tank is connected to the polished rod treatment tank through a clean water valve, and the inlet end of the clean water circulation tank is connected to a riser pipeline leading to the bottom of the polished rod treatment tank through a clean water backflow valve.

[0012] Preferably, the polished rod treatment tank is externally connected to a heating system, the heating system comprises an electric heating control device connected to a heating belt, a plurality of partitions are arranged in parallel inside the polished rod treatment tank, a polished rod is arranged on each partition, and the two ends of the polished rod treatment tank are connected to a hatch cover through a hatch cover connector.

[0013] The application also provides a construction method of the chemical sealing device for the surface defects of the polished rod of the pumping unit, which comprises the following steps:

[0014] S1, sequentially loading the polished rod and the partition into the polished rod treatment tank;

[0015] S2, injecting the oil removal agent into the polished rod treatment tank until the tank is filled;

[0016] S3, heating the polished rod treatment tank to 60-70 DEG C through the heating system;

[0017] S4, realizing the circulation of the oil removal agent in the polished rod treatment tank through the oil removal agent circulation system;

[0018] S5, continuously injecting steam into the polished rod treatment tank 01 for 15 min through the steam generation system, and recovering the excess steam to the steam cooling recovery tank 16 through the excess steam recovery system;

[0019] S6, closing the steam generation system, and emptying the oil removal agent to the oil removal agent tank 25;

[0020] S7, completing the clean water circulation and the polished rod cleaning process through the clean water circulation system;

[0021] S8, empty clean water, the constant temperature of the light rod processing tank 65℃, and dry for 4h;

[0022] S9, the sealing agent is injected into the light rod processing tank 01; continue to maintain the light rod processing tank 01 heating 70℃;

[0023] S10, the sealing agent circulation is realized through the sealing agent circulation system, and the sealing agent circulation is kept for 30min, and the natural cooling is kept for 24h;

[0024] S11, the treated light rod is taken out, and the indoor ventilation is placed for more than 24h, and the surface dryness is checked.

[0025] Preferably, the components and the ratio of the sealing agent on the surface of the light rod are as follows:

[0026] Epoxy resin E44 560 parts;

[0027] Dimethyl acrylic resin 400 parts;

[0028] Polyepoxy chloropropane epoxy resin 140 parts;

[0029] Butyl glycerol ether 100 parts;

[0030] Defoaming agent EFKA2720 2.5 parts;

[0031] Stabilizer TINUVIN292 6.5 parts;

[0032] Polyamide 80 parts;

[0033] Harmonized solvent 1#:(xylene / 200# solvent oil 2:1 stirring) summer 800 parts / winter 1500 parts;

[0034] Preferably, the components and the ratio of the water-based oil removal agent are as follows:

[0035] Sodium sulfonate 3 parts;

[0036] Diethanolamine 5 parts;

[0037] Polyoxyethylene ether-9 12 parts;

[0038] NaOH 0.5 parts;

[0039] TKPP 6T 1 part;

[0040] Ethylene glycol butyl ether 4 parts;

[0041] Water 70-80 parts.

[0042] Preferably, the light rod after use can be extended by adding a sealing agent supplement liquid to extend the sealing effect; the sealing agent supplement liquid is added to the top of the grommet box cover and welded with a short ring of the same caliber of 50mm height to form a storage cup for the sealing agent supplement liquid.

[0043] Preferably, the light rod surface sealing agent supplement liquid has the following components and proportions by mass fraction:

[0044] E44 epoxy resin 50;

[0045] Dimethyl acrylic resin 600;

[0046] Polyepoxy chloropropane epoxy resin 80;

[0047] Butyl glycerol ether 60;

[0048] EFKA2720 defoaming agent 2;

[0049] TINUVIN292 stabilizer 5;

[0050] Polyamide 100;

[0051] 1# solvent (xylene / 200# solvent oil 2:1 stirring) summer 800 / winter 1500; Preferably, the light rod surface sealing agent and the light rod surface sealing agent supplement liquid are prepared as follows: A. E44 epoxy resin, dimethyl acrylic resin, polyepoxy chloropropane epoxy resin, and 1# blended solvent 1# are added to the reaction kettle in proportion, diluted and heated to 60°C, and continuously stirred for 15 min;

[0052] B. Butyl glycerol ether, EFKA2720 defoaming agent, TINUVIN292 stabilizer are added in proportion and continuously stirred for 5 min;

[0053] C. Polyamide is added and continuously stirred for 5 min; the product is prepared.

[0054] The sealing agent immersion film forming standard process is tested according to 200μm±20% thickness, maintained at 70°C for 30 min, 50°C for 90 min, and 25°C for 180 min to reach the standard. The sealing agent test dry time is at least 70°C for 30 min and at most 30°C for 300 min.

[0055] The surface sealing treatment effect of a common light rod is as shown in Figure 4 It can be seen that the micro-bubble phenomenon caused by the overflow of internal air due to the surface defect cracks of the light rod is completely covered by the sealing agent layer after grinding the surface of the bubble area. Figure 5 For the surface sealing effect of the alloy light rod, the overall surface area and the defect area are both well covered.

[0056] Compared with the above-mentioned background technology, the present invention has the following beneficial effects:

[0057] Chemical sealing treatment is applied to the surface of the polished rod, utilizing the film-forming effect of the sealant to fill and seal defective areas, thus terminating various types of corrosion. Before installation, the polished rod undergoes pre-sealing treatment with a sealing agent. After installation, the sealing effect can be extended by periodically adding sealant replenishment fluid, effectively preventing contact corrosion in defective areas for an extended period. This method offers advantages such as low cost and reliable operation, significantly extending the lifespan of the polished rod. In severely corroded ternary hydraulic wells, the polished rod replacement cycle can be extended from <30 days to over 180 days. The service life of the polished rod exceeds one year, with an average of over two years, making it worthy of large-scale application. Attached Figure Description

[0058] Appendix Figure 1 This is a schematic diagram of the optical rod processing device of the present invention;

[0059] Appendix Figure 2 This is a schematic diagram of the structure of the smooth rod processing tank of the present invention;

[0060] Appendix Figure 3 This is a longitudinal sectional view of the middle section of the smooth rod processing tank of the present invention;

[0061] Appendix Figure 4 This is the surface treatment effect of the ordinary smooth rod of the present invention;

[0062] Appendix Figure 5 This invention demonstrates the effect of alloy rod surface treatment.

[0063] Appendix Figure 6 This is an example of the surface treatment effect of an alloy polished rod applied for 40 days according to an embodiment of the present invention. In the figure: 1. Polished rod treatment tank; 2. Electric heating control device; 3. Polished rod to be treated; 4. Polished rod partition; 5. Polished rod treatment tank cover; 6. Heating belt; 7. Chemical circulation pump; 8. Circulation pipeline; 9. Upper exhaust valve; 10. Chemical return valve; 11. Clean water return valve; 12. Chemical tank; 13. Clean water circulation tank; 14. Chemical dosing valve; 15. Clean water valve; 16. Steam cooling recovery tank; 17. Steam recovery valve; 18. Steam valve; 19. Steam generator; 20. Drain valve; 21. Tank cover connector; 22. Balance valve; 23. Degreasing agent valve; 24. Degreasing agent recovery valve; 25. Degreasing agent tank. Detailed Implementation

[0064] The present invention will be further described below with reference to the accompanying drawings:

[0065] As attached Figure 1 , Figure 2 , Figure 3As shown, the chemical sealing device for surface defects of the polished rod of the pumping unit comprises a polished rod treatment tank 1, which is respectively connected with a steam generation system, a surplus steam recovery system, a deoiling agent circulating system, a sealing agent circulating system and a clean water circulating system; the polished rod treatment tank 1 is further connected with a heating system outside, and the heating system comprises an electric heating control device 2 connected with a heating belt 6; a plurality of partitions 4 are arranged in parallel inside the polished rod treatment tank 1, and a polished rod 3 is arranged on each partition 4; the polished rod treatment tank is connected with a hatch cover 5 through a hatch cover connector 21 at both ends.

[0066] The steam generation system comprises a steam generator 19 connected with the polished rod treatment tank 1 through a steam valve 18; the surplus steam recovery system comprises an exhaust pipeline connected with a steam recovery valve 17 and a balance valve 22 through an upper exhaust valve 09; the steam recovery valve 17 is connected with a steam cooling recovery tank 16, and the balance valve 22 is connected with a venting pipeline; the deoiling agent circulating system comprises a deoiling agent tank 25, and the outlet end of the deoiling agent tank 25 is connected with the polished rod treatment tank 1 through a deoiling agent valve 23; the inlet end of the deoiling agent tank 25 is connected with a riser pipe 8 connected with one end of a tank bottom pipeline of the polished rod treatment tank 1 through a deoiling agent recovery valve 24, and a chemical circulating pump 7 is connected with the riser pipe 8; the tank bottom pipeline of the polished rod treatment tank 1 is connected with a liquid discharge valve 20.

[0067] The sealing agent circulating system comprises a medicament tank 12, and the outlet end of the medicament tank 12 is connected with the polished rod treatment tank 1 through a medicament filling valve 14; the inlet end of the medicament tank 12 is connected with the riser pipe 8 leading to the tank bottom of the polished rod treatment tank 1 through a medicament backflow valve 10.

[0068] The clean water circulating system comprises a clean water circulating tank 13, and the outlet end of the clean water circulating tank 13 is connected with the polished rod treatment tank 1 through a clean water valve 15; the inlet end of the clean water circulating tank 13 is connected with the riser pipe 8 leading to the tank bottom of the polished rod treatment tank 1 through a clean water backflow valve 11.

[0069] The polished rod treatment tank 1 of the device is provided with a plurality of polished rods 03 to be treated inside the tank body, and the polished rods 03 are separated by a plurality of partitions 04; the two ends of the treatment tank are provided with hatch covers 05 which can be opened laterally and are connected with the treatment tank through a hatch cover connector 21, and are used for taking and placing the polished rods 03 and the partitions 04; the outer side of the polished rod treatment tank 01 is provided with a heating layer and a heat preservation layer wound by an electric heating belt 6, which can be used for heating the polished rod treatment tank; the polished rod treatment tank is respectively provided with a steam valve 18 and a liquid discharge valve 20 at both sides of the bottom of the polished rod treatment tank; and the polished rod treatment tank is provided with a clean water valve 15, a medicament filling valve 14, an upper exhaust valve 09 and a deoiling agent recovery valve 24 at the upper part of the polished rod treatment tank.

[0070] The electric heating control device 2 is an external temperature control heater used for constant temperature control of the electric heating belt 6.

[0071] The chemical sealing device for surface defects of the polished rod of the pumping unit is used for chemical sealing of the surface defects of the polished rod, and the construction process thereof is as follows:

[0072] S1, open the hatch 5 of the polished rod treatment tank 1, and sequentially load the polished rod 3 and the partition plate 4 into the tank;

[0073] S2, close the hatch 5 and fasten the hatch connector 21;

[0074] S3, open the oil removal agent valve 23, and inject the oil removal agent into the polished rod treatment tank 1 until it is filled;

[0075] S4, start the electric heating control device 2, and heat the heating belt 6 to 60-70℃;

[0076] S5, open the liquid discharge valve 20, and start the chemical circulating pump 7 to realize the circulation of the oil removal agent through the lifting pipeline 8, the oil removal agent recovery valve 24, the oil removal agent tank 25, the oil removal agent valve 23 to the polished rod treatment tank 1;

[0077] S6, stop the chemical circulating pump 7, close the liquid discharge valve 20, and open the upper exhaust valve 9 and the steam recovery valve 17;

[0078] S7, open the steam valve 18, start the steam generator 19, and continuously inject steam into the polished rod treatment tank 1 for 15 minutes, and the excess steam is cooled and recovered in the steam cooling recovery tank 16 through the upper exhaust valve 9 and the steam recovery valve 17;

[0079] S8, close the steam generator 19 and the steam valve 18;

[0080] S9, open the liquid discharge valve 20, and restart the chemical circulating pump 7 to empty the oil removal agent into the oil removal agent tank 25;

[0081] S10, open the clean water valve 15 to guide the clean water in the clean water circulating tank 13 into the polished rod treatment tank 1, and complete the clean water circulation cleaning process of the polished rod through the liquid discharge valve 20, the chemical circulating pump 7, the lifting pipeline 8, the clean water return valve 11, the clean water circulating tank 13 and the clean water valve 15;

[0082] S11, empty the clean water, open the upper exhaust valve 9 and the balance valve 22, and place the polished rod treatment tank 1 at a constant temperature of 65℃ for 4 hours for drying;

[0083] S12, open the medicament injection valve 14 to inject the sealing agent in the medicament tank 12 into the polished rod treatment tank 1; and continue to maintain the polished rod treatment tank 1 at a temperature of 70℃;

[0084] S13, open the liquid discharge valve 20, and start the chemical circulating pump 7 to realize the circulation of the sealing agent through the lifting pipeline 8, the medicament injection valve 14 and the medicament tank 12 to the polished rod treatment tank 1;

[0085] S14, the sealing agent circulation keeps 30 min, and naturally cools for 24 hours;

[0086] S15, the polished rod treated is taken out, and is placed for 24 hours or more in the room to ventilate, and the surface dryness is checked.

[0087] The polished rod surface sealing agent formula used in the construction process (expressed in mass parts) is as follows:

[0088] Epoxy resin E44 560 parts;

[0089] Dimethyl acrylic resin 400 parts;

[0090] Polyepoxy chloropropane epoxy resin 140 parts;

[0091] Butyl glycerol ether 100 parts;

[0092] Defoaming agent EFKA2720 2.5 parts;

[0093] Stabilizer TINUVIN292 6.5 parts;

[0094] Polyamide 80 parts;

[0095] Harmonized solvent 1#: (xylene / 200# solvent oil 2:1 stirring) 800 parts in summer / 1500 parts in winter;

[0096] The polished rod surface sealing agent preparation method used in the construction process comprises the following steps:

[0097] A, E44 epoxy resin 560; dimethyl acrylic resin 400; polyepoxy chloropropane epoxy resin 140; 1# solvent 1000, is put into a reaction kettle, is diluted and heated to 60 DEG C, and is continuously stirred for 15 min;

[0098] B, butyl glycerol ether 100; EFKA2720 defoaming agent 2.5; TINUVIN292 stabilizer 6.5; is added again and continuously stirred for 5 min;

[0099] C, polyamide 80 is put, and continuously stirred for 5 min;

[0100] A short ring with the same caliber of 50 mm height is welded on the top end of the gland of the original packing box, the sealing agent supplement liquid is added through the short ring to form a storage cup for placing the sealing agent supplement liquid. The polished rod surface sealing agent supplement liquid stage is used, and the supplement liquid storage cup is added regularly.

[0101] The polished rod surface sealing agent supplement liquid formula used in the construction process (expressed in mass parts) is as follows:

[0102] E44 epoxy resin 50 parts;

[0103] Dimethyl acrylic resin 600 parts;

[0104] Polyepoxy chloropropane epoxy resin 80 parts;

[0105] Butyl glycerol ether 60 parts;

[0106] EFKA2720 defoaming agent 2 parts;

[0107] TINUVIN292 stabilizer 5 parts;

[0108] Polyamide 100 parts;

[0109] 1# solvent (xylene / 200# solvent oil 2:1 stirring) summer 800 parts / winter 1500 parts;

[0110] The manufacturing method is the same as the surface sealing agent of the light pole.

[0111] The water-based oil remover (alkaline degreaser) formula used in the construction process (in mass parts):

[0112] Sodium sulfonate 3 parts;

[0113] Diethanolamine 5 parts;

[0114] Polyoxyethylene ether-9 12 parts;

[0115] NaOH 0.5 parts;

[0116] TKPP 6T 1 part;

[0117] Ethylene glycol butyl ether 4 parts;

[0118] Water 70-80 parts;

[0119] Manufacturing method:

[0120] Heat all the ingredients to 65℃ and continuously stir for 15 minutes.

[0121] Example 1

[0122] (1) According to the structural characteristics of the light pole, a 10-meter*5-group-length light pole sealing treatment tank is constructed according to its length, with a 15KW electric heating belt heating function, a 50L steam heating capacity per hour, different reagent segmented operation and transfer, and different light pole treatment operations can be performed simultaneously, meeting the requirements of the light pole treatment process.

[0123] (2) The on-site installed chemical treatment light pole should be regularly maintained to ensure the durability of the light pole sealing effect.

[0124] The specific scheme includes:

[0125] A. Weld a short ring of the same caliber 50mm height on the top of the original seal (packing box) cover, add the sealing agent supplement liquid through the short ring, and form a storage cup for placing the sealing agent supplement liquid.

[0126] B. During the stage of using the surface sealing agent supplement liquid of the polished rod, the supplement liquid is regularly added into the supplement liquid storage cup, the supplement liquid includes two kinds of low viscosity in winter and high viscosity in summer (1# solvent dosage: 800 parts in summer; 1500 parts in winter); before filling, the dirt in the storage cup should be cleaned.

[0127] After the device is used, the replacement period of the polished rod of the ternary drive is prolonged by more than 180D from less than 30D; according to the application effect on the spot, it is determined that the service life of the polished rod is more than 1 year, and it is predicted that it can reach more than 2 years;

[0128] Experimental situation of the chemical sealing device for surface defects of the polished rod of the pumping unit

[0129] Since late February 2018, the polished rods treated by sealing have been applied in batches on the spot, at present, among the 20 test wells of the ternary drive in No. 1 Mine of Daqing Oil Production No. 4 Plant, except that the polished rods of 2 wells are replaced due to reasons, the working conditions of the polished rods of the remaining 18 wells are good, and no corrosion traces are found on the surface, and the service life is expected to be more than 1-2 years. (The original polished rod has a corrosion period of less than 30 days) The replacement period of the polished rod is prolonged by more than 20 times, and the test effect far exceeds the expected value.

[0130] On-site application of the chemical sealing device for surface defects of the polished rod of the pumping unit

[0131] From February to March 2018, a total of 20 polished rods of test wells were applied in the A team of the ternary drive of a plant in Daqing, except that the polished rods of 2 wells were scrapped due to production reasons, the running conditions of the polished rods of the remaining 18 wells were good, and no corrosion traces were found on the surface. For the polished rod of 3-D4-E019 well scrapped after 40 days, metallographic detection is performed, as shown in Figure 6 , the surface effect of the material is smooth and flat without corrosion. The specific statistical situation is shown in Table 1:

[0132] Table 1

[0133]

[0134]

[0135] Through the test analysis of the chemical sealing device for surface defects of the polished rod of the pumping unit, the following conclusions are obtained:

[0136] (1) The polished rod surface corrosion pit is directly related to the material defects of the polished rod, including the forging cracks of the ordinary rod and the thermal spraying unevenness of the alloy rod, and the groove pits of the base material and the like;

[0137] (2) The surface of the polished rod is subjected to chemical sealing treatment, the sealing agent is used to form a film to fill and block the defect site and terminate the generation of various corrosion;

[0138] (3) A long-life high-weather-resistant sealing agent series formula based on dimethyl acrylic resin is developed, which has the characteristics of alkali resistance, oil resistance and water resistance, and is used for sealing the polished rod;

[0139] (4) The sealing agent is pre-sealed by a sealing treatment device before the polished rod is lowered into the well;

[0140] (5) The sealing effect can be prolonged by regularly adding a sealing agent supplement to the polished rod, and good sealing effect can be achieved for a long time.

[0141] In summary, the polished rod sealing agent technology has the advantages of low cost and reliable operation, can greatly prolong the service life of the polished rod, and has great application value.

Claims

1. A chemical sealing device for surface defects of a polished rod of a pumping unit, comprising a polished rod treatment tank (1), characterized in that: The polished rod treatment tank is respectively connected with a steam generation system, a surplus steam recovery system, a deoiling agent circulating system, a sealing agent circulating system and a clean water circulating system. The sealing agent circulating system comprises a sealing agent tank (12), and an outlet end of the sealing agent tank (12) is connected with the polished rod treatment tank through a sealing agent filling valve (14); an inlet end of the sealing agent tank (12) is connected with a lifting pipe (8) leading to a tank bottom of the polished rod treatment tank through a sealing agent backflow valve (10). The components and the proportion of the sealing agent for the polished rod are as follows in terms of mass fraction: epoxy resin E44 560 parts; dimethyl acrylic resin 400 parts; polyepoxy chloropropane epoxy resin 140 parts; butyl glycerol ether 100 parts; antifoaming agent EFKA2720 2.5 parts; stabilizer TINUVIN292 6.5 parts; polyamide 80 parts; harmonized solvent 1# (800 parts in summer and 1500 parts in winter); the harmonized solvent 1# comprises dimethylbenzene and 200# solvent oil, and the mass fraction of the dimethylbenzene to the 200# solvent oil is 2:

1.

2. The pumping unit polish rod surface defect chemical sealing device according to claim 1, characterized in that: The steam generation system comprises a steam generator (19), and the steam generator (19) is connected with the polished rod treatment tank (1) through a steam valve (18). The surplus steam recovery system comprises an exhaust pipeline, and the exhaust pipeline is respectively connected with a steam recovery valve (17) and a balance valve (22) through an upper exhaust valve (9); the steam recovery valve (17) is connected with a steam cooling recovery tank (16), and the balance valve (22) is connected with a venting pipeline.

3. The pumping unit polish rod surface defect chemical sealing device according to claim 1, characterized in that: The deoiling agent circulating system comprises a deoiling agent tank (25), and an outlet end of the deoiling agent tank (25) is connected with the polished rod treatment tank through a deoiling agent valve (23); an inlet end of the deoiling agent tank (25) is connected with the lifting pipe (8) leading to the tank bottom of the polished rod treatment tank through a deoiling agent recovery valve (24), and the lifting pipe (8) is connected with a chemical circulating pump (7); the tank bottom of the polished rod treatment tank is connected with a liquid discharge valve (20). The clean water circulating system comprises a clean water circulating tank (13), and an outlet end of the clean water circulating tank (13) is connected with the polished rod treatment tank through a clean water valve (15); an inlet end of the clean water circulating tank (13) is connected with the lifting pipe (8) leading to the tank bottom of the polished rod treatment tank through a clean water backflow valve (11).

4. The pumping unit polish rod surface defect chemical sealing device according to claim 1, characterized in that: The polished rod treatment tank is externally connected with a heating system, the heating system comprises an electric heating control device, and the electric heating control device is connected with a heating belt; a plurality of partitions are arranged in parallel inside the polished rod treatment tank, and a polished rod is arranged on each partition; the two ends of the polished rod treatment tank are connected with hatch covers through hatch cover connectors.

5. A method for applying the chemical closure of surface defects of the polished rod of a pumping unit according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1, sequentially loading the polished rod and the partition into the polished rod treatment tank; S2, injecting the deoiling agent into the polished rod treatment tank until the deoiling agent is filled; S3, heating the polished rod treatment tank to 60-70℃ through the heating system; S4, realizing the circulation of the deoiling agent in the polished rod treatment tank through the deoiling agent circulating system; S5, continuously injecting steam into the polished rod treatment tank for 15 minutes through the steam generation system, and recovering the surplus steam to the steam cooling recovery tank through the surplus steam recovery system for cooling and recovery; S6, closing the steam generation system, and emptying the deoiling agent into the deoiling agent tank; S7, completing the clean water circulation and cleaning the polished rod through the clean water circulating system. S8, empty clean water, constant temperature 65℃ of the polished rod treatment tank, static drying 4h; S9, the sealing agent is injected into the polished rod treatment tank; continue to maintain the polished rod treatment tank heating 70℃; S10, through the sealing agent circulation system to achieve the sealing agent circulation, sealing agent circulation for 30min, natural cooling 24h; S11, the polished rod is taken out, indoor ventilation for 24h, check the surface dryness.

6. The method of construction according to claim 5, wherein: The components and the ratio of the polished rod surface sealing agent are as follows in mass fraction: Epoxy resin E44 560 parts; Dimethyl acrylic resin 400 parts; Polyepoxy chloropropane epoxy resin 140 parts; Butyl glycerol ether 100 parts; Defoaming agent EFKA2720 2.5 parts; Stabilizer TINUVIN292 6.5 parts; Polyamide 80 parts; Harmonized solvent 1: 800 parts in summer / 1500 parts in winter; wherein the harmonized solvent 1 includes dimethylbenzene, 200# solvent oil, and the mass fraction ratio of dimethylbenzene / 200# solvent oil is 2:

1.

7. The method of construction according to claim 5, wherein: The components and the ratio of the water-based oil removal agent are as follows in mass fraction: Sodium sulfonate 3 parts; Diethanolamine 5 parts; Polyoxyethylene ether-9 12 parts; NaOH 0.5 parts; TKPP 6T 1 part; Ethylene glycol butyl ether 4 parts; Water 70-80 parts.

8. The method of construction according to claim 5, wherein: The polished rod after use can be added with the sealing agent supplement liquid to prolong the sealing effect; the sealing agent supplement liquid is added at the position of welding and adding a short ring with the same caliber of 40-50mm height on the top end of the gland of the packing box to form a storage cup for placing the sealing agent supplement liquid.

9. The method of construction according to claim 8, wherein: The components and the ratio of the polished rod surface sealing agent supplement liquid are as follows in mass fraction: E44 epoxy resin 50 parts; Dimethyl acrylic resin 600 parts; Polyepoxy chloropropane epoxy resin 80 parts; Butyl glycerol ether 60 parts; EFKA2720 defoaming agent 2 parts; TINUVIN292 stabilizer 5 parts; Polyamide 100 parts; 1# solvent 800 parts in summer / 1500 parts in winter; wherein the 1# solvent includes dimethylbenzene, 200# solvent oil, and the mass fraction ratio of dimethylbenzene / 200# solvent oil is 2:

1.

10. The construction method according to claim 6 or 9, characterized in that: The preparation method of the polished rod surface sealing agent and the polished rod surface sealing agent supplement liquid: A. according to the proportion, the E44 epoxy resin, dimethyl acrylic resin, polyepoxy chloropropane epoxy resin and the harmonized solvent 1 are put into the reaction kettle, diluted and heated to 60℃, continuously stirred for 15min; B. according to the proportion, the butyl glycerol ether, EFKA2720 defoaming agent and TINUVIN292 stabilizer are added again and continuously stirred for 5min; C. the polyamide is put in and continuously stirred for 5min; the product is prepared.

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