A novel anti-corrosion sucker rod and its production method

Abstract

The present invention provides a novel anti-corrosion sucker rod and a production method thereof, wherein the novel anti-corrosion sucker rod comprises a rod body and an anti-corrosion layer arranged on the outer surface of the rod body, the anti-corrosion layer comprises: a phenolic coating layer, an epoxy resin layer and an intermediate connecting layer arranged therebetween, the components of the material of the intermediate connecting layer comprise: by weight, 75-95 parts of epoxy resin, 30-35 parts of antioxidant polyurethane prepolymer and 20-30 parts of graphene, by arranging the anti-corrosion layer on the surface of the sucker rod, the anti-corrosion layer comprises the intermediate connecting layer, the intermediate connecting layer can improve the bonding strength between the anti-corrosion layer and the surface of the rod body, improve the peeling strength, and the intermediate connecting layer has good electrical conductivity, which can facilitate leak detection of the epoxy resin layer.

Description

Technical Field

[0001] The invention relates to the technical field of sucker rods, and in particular to a novel anti-corrosion sucker rod and a production method thereof. Background Art

[0002] The sucker rod is an important component for transmitting power in the rod pump in oil production. As a component for transmitting power, the sucker rod is located inside the oil pipe, with the upper end connected to the ground power device and the lower end connected to the pump body downhole. It works in the oil-water medium downhole for a long time, and the oil well is accompanied by corrosive media such as carbon dioxide, hydrogen sulfide, and bacteria, which corrode the surface of the sucker rod. Moreover, since the depth of the oil well is as high as several thousand meters, the sucker rod needs to be connected end to end for several thousand meters to transmit power. When transmitting radial power, the sucker rod will swing radially and rub against the side wall of the oil pipe. Therefore, corrosion and wear will seriously affect the service life of the sucker rod.

[0003] In this regard, in order to improve the anti-corrosion performance of the sucker rod and increase the service life of the sucker rod, a large number of sucker rods with anti-corrosion performance have been developed and launched. In the prior art, the anti-corrosion performance of the anti-corrosion sucker rod is mostly achieved by forming an anti-corrosion layer on the surface of the sucker rod to achieve the anti-corrosion effect, and the wear-resistant performance is also achieved through the anti-corrosion layer.

[0004] Among various anti-corrosion methods, the anti-corrosion effect of setting an epoxy resin anti-corrosion layer on the surface of the sucker rod is particularly outstanding, so it has been widely promoted and applied. At present, the epoxy resin anti-corrosion layer is formed by first forming a phenolic coating layer on the surface of the rod body and the rod head of the sucker rod, and then forming an epoxy resin layer. In the actual application process, the epoxy resin layer formed by the above method has an excellent anti-corrosion effect and can greatly improve the service life of the sucker rod. However, there are still some problems in use. Delamination, peeling, and damage will occur in some areas of the sucker rod and the epoxy resin layer. After research, the above phenomenon has the following reasons: 1. The reason for peeling is that there are leaks in the epoxy resin layer. After long-term use, petroleum penetrates through the leaks to between the epoxy resin layer and the sucker rod, corroding the connection between the epoxy resin layer and the sucker rod, and the surface of the sucker rod is corroded.

[0005] 2. The bonding strength between epoxy resin and the surface of the sucker rod is not strong enough, which will cause local stratification after the sucker rod moves back and forth in the local bending area.

[0006] 3. The anti-corrosion effect of the phenolic resin layer is limited. Once a leak appears in the epoxy resin layer, the oil will seep through the leak and cannot effectively prevent corrosion on the surface of the sucker rod.

[0007] Based on the above reasons, the existing sucker rod still has room for improvement to achieve better anti-corrosion performance. Summary of the invention

[0008] The object of the present invention is to solve the above-mentioned problem and provide a novel anti-corrosion sucker rod capable of improving the performance of the anti-corrosion sucker rod and a production method thereof.

[0009] To achieve the above object, the technical solution of the present invention is: a new type of anti-corrosion sucker rod, including a rod body and an anti-corrosion layer arranged on the outer surface of the rod body, the anti-corrosion layer comprising: A phenolic coating layer, an epoxy resin layer and an intermediate connecting layer arranged therebetween, wherein the components of the intermediate connecting layer material include: by weight, 75-95 parts of epoxy resin, 30-35 parts of antioxidant polyurethane prepolymer and 20-30 parts of graphene.

[0010] Furthermore, the components of the antioxidant polyurethane prepolymer include: in parts by weight, 20-35 parts of toluene diisocyanate, 2-5 parts of ethyl isocyanate acrylate, 10-15 parts of trans-3-hydroxypropylene boric acid pinacol ester, 10-18 parts of polyoxypropylene ether glycol, 2-5 parts of stannous octoate, 0.04-0.15 parts of 4-allyl-2-methoxyphenol, 1.4-3.5 parts of (ferrocenyl) hexanethiol, and 2-5 parts of triethylamine.

[0011] Furthermore, the components of the phenolic coating layer include a base component and a curing agent. In terms of mass ratio, the ratio of the base component to the curing agent is 6:1, wherein the components include 60%-65% phenolic epoxy resin, 0.5%-1.0% dispersant, 25%-35% powdered particles, 0.5%-2% coupling agent, and 5%-10% graphene.

[0012] Furthermore, the particle size of the powder particles is less than or equal to 60 microns, and the components are 40%-60% mica iron oxide and 20%-50% titanium dioxide.

[0013] Furthermore, the phenolic epoxy resin includes DEN431, DEN438, EPALLOY At least one of 8240.

[0014] Furthermore, the coupling agent is GX-560.

[0015] Further, the following steps are included: Step 1, forming a phenolic coating layer on the surface of the sucker rod body after surface treatment; Step 2, forming an intermediate connection layer, configuring materials according to a ratio, adding them to a spraying device after configuration and spraying them on the surface of the phenolic coating layer to form an intermediate connection layer, and the components of the intermediate connection layer material include: according to weight parts, 75-95 parts of epoxy resin, 30-35 parts of antioxidant polyurethane prepolymer and 20-30 parts of graphene; Step 3: When the intermediate connection layer is not completely cured, epoxy resin coating is sprayed on its surface, and then it is heated and dried in a heating furnace to cure the material and form an epoxy resin layer.

[0016] Furthermore, it also includes: Step 4: Detect leaks in the anti-corrosion layer on the surface of the sucker rod and repair the leaks.

[0017] Furthermore, in step 4, when the anti-corrosion layer on the surface of the sucker rod is tested for leaks, the area on the surface of the sucker rod where the leaks occur is marked.

[0018] Further, a detection device is included, and the detection device includes: A conveying unit, used for conveying the sucker rod to be inspected; A detection component is arranged at one end of the transmission unit; A leakage point signal amplifier, electrically connected to the detection component; The marking device is connected to the marking device and is arranged downstream of the detection component along the conveying direction of the conveying unit.

[0019] Compared with the prior art, the novel anti-corrosion sucker rod and the production method thereof disclosed in the present invention have the following beneficial effects: 1. An anti-corrosion layer is provided on the surface of the sucker rod, and the anti-corrosion layer includes an intermediate connecting layer. The intermediate connecting layer can improve the bonding strength between the anti-corrosion layer and the surface of the rod body, improve the peeling strength, and the intermediate connecting layer has good conductivity, which can facilitate leak detection of the epoxy resin layer.

[0020] 2. The anti-corrosion layer includes a phenolic coating layer. The phenolic coating layer has a good anti-corrosion effect. When the external epoxy resin layer has a leak point and oil leakage occurs, the phenolic coating layer can also achieve anti-corrosion performance, further improving the overall anti-corrosion performance of the sucker rod.

[0021] 3. Through leak detection on the surface of the anti-corrosion sucker rod, the leaking parts are repaired to reduce the leakage rate of the anti-corrosion layer, thus ensuring the anti-corrosion performance of the sucker rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the cross-sectional structure of a novel anti-corrosion sucker rod of the present invention.

[0023] Figure 2 The present invention is a schematic flow chart of a novel anti-corrosion sucker rod production method.

[0024] Figure 3 The present invention is a schematic structural diagram of a detection device for detecting leakage points of an anti-corrosion layer on the surface of a novel anti-corrosion sucker rod in a novel anti-corrosion sucker rod production method of the present invention.

[0025] Figure 4 The structure of the detection component in the novel anti-corrosion sucker rod production method of the present invention is schematically shown. Figure 1 .

[0026] Figure 5 The structure of the detection component in the present invention is shown in FIG. Figure 2 .

[0027] Figure 6 The cross-sectional structure of the detection component in the present invention is shown in FIG. Figure 1 .

[0028] Figure 7 The cross-sectional structure of the detection component in the present invention is shown in FIG. Figure 2 .

[0029] Figure 8 The structure of the detection component in the present invention is shown in FIG. Figure 3 .

[0030] Fig. 9 It is a schematic diagram of the structure of the conductive component in the present invention.

[0031] Fig.10 It is a schematic diagram of the cross-sectional structure of the positioning roller in the present invention.

[0032] Fig.11 It is a schematic diagram of the three-dimensional structure of the positioning roller in the present invention.

[0033] Fig.12 for Fig.10 The schematic diagram of the local enlarged structure of point A in the present invention is shown.

[0034] Fig.13 for Fig.11 The schematic diagram of the local enlarged structure of point B in the present invention is shown.

[0035] Fig.14 It is a schematic diagram of the connection structure between the valve body and the reciprocating drive rod in the present invention.

[0036] In the figure: 1, detection component; 10, upper shell; 11, lower shell; 115, hinge; 101, handle; 102, water inlet pipe; 103, wire; 1030, conductive column; 104, limit plate; 105, guide rod; 110, drain pipe; 12, current limiting ring; 120, first negative pressure pipe; 121, adsorption micropore; 13, channel; 14, positioning roller; 142, first annular groove; 143, second annular groove; 144, third annular groove; 145, fourth annular groove; 146 first connecting flow channel; 147, second connecting flow channel; 148, discharge channel; 149, blind groove; 15. Rigid plate; 151. Compression spring; 16. Water absorbing member; 160. Conductive housing; 162. Arc member; 163. Guide member; 17. Reciprocating linear drive rod; 170. Columnar cavity; 171. Piston; 172. Piston rod; 173. First port; 174. Second port; 175. Second negative pressure tube; 176. Third negative pressure tube; 18. valve body; 181. connecting pipe; 182. connecting port; 2. Water source; 3. Leakage signal amplifier; 31. First wiring terminal; 32. Second wiring terminal; 7. Marking equipment; 8. Conveyor roller; 6. Sucker rod 61. Rod body; 62. Anti-corrosion layer; 621. Phenolic coating layer; 622. Middle connecting layer; 623. Epoxy resin layer. DETAILED DESCRIPTION

[0037] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0038] Embodiment 1 Please refer to Figure 1 As a specific implementation, the technical solution of the present invention is: a new type of anti-corrosion sucker rod, including a rod body 61 and an anti-corrosion layer 62 arranged on the outer surface of the rod body 61, the anti-corrosion layer 62 includes: The phenolic coating layer 621, the epoxy resin layer 623 and the intermediate connecting layer 622 disposed therebetween, the intermediate connecting layer 622 material components include: by weight, 75-95 parts of epoxy resin, 30-35 parts of antioxidant polyurethane prepolymer and 20-30 parts of graphene.

[0039] Specifically, during implementation, the surface of the sucker rod is first treated by grinding, degreasing, etc., and a phenolic coating layer 621 is formed on the surface of the sucker rod after the treatment. After the phenolic coating layer is cured, the ratio of epoxy resin is 75 parts, anti-oxidation polyurethane prepolymer is 35 parts, and graphene is 20 parts, wherein the graphene is crushed into particles with a particle size of less than 30 microns by a crushing device, and then evenly mixed with the materials and sprayed evenly on the surface of the phenolic coating layer. After the intermediate connecting layer 62 is formed, epoxy resin coating is sprayed on the surface of the intermediate connecting layer, and an anti-corrosion layer is formed after curing. The peeling strength between the anti-corrosion layer on the surface of the processed new sucker rod and the rod body can reach 14.25KN. After the phenolic coating layer 621 is set on the surface of the rod body in the same way, an epoxy resin layer 623 is directly set on the surface of the phenolic coating layer, and the peeling strength of the formed anti-corrosion layer is 10.23KN.

[0040] Embodiment 2 The surface of the sucker rod is treated by grinding, degreasing, etc., and a phenolic coating layer 621 is formed on the surface of the sucker rod after the treatment. After the phenolic coating layer is cured, 80 parts of epoxy resin, 25 parts of antioxidant polyurethane prepolymer, and 25 parts of graphene are mixed according to the ratio, wherein the graphene is crushed into particles with a particle size of less than 30 microns by a crushing device, and then evenly mixed with the materials and sprayed evenly on the surface of the phenolic coating layer to form an intermediate connecting layer 62. After the epoxy resin coating is sprayed on the surface of the intermediate connecting layer, an anti-corrosion layer is formed after curing. The peeling resistance between the anti-corrosion layer on the surface of the processed new sucker rod and the rod body can reach 13.25KN, thereby improving the connection strength between the anti-corrosion layer and the sucker rod body.

[0041] Embodiment 3 The surface of the sucker rod is treated by grinding, degreasing, etc., and a phenolic coating layer 621 is formed on the surface of the sucker rod after the treatment. After the phenolic coating layer is cured, the ratio of epoxy resin is 80 parts, anti-oxidation polyurethane prepolymer is 35 parts, and graphene is 25 parts. The graphene is crushed into particles with a particle size of less than 30 microns by a crushing device. After being evenly mixed with the materials, it is evenly sprayed on the surface of the phenolic coating layer to form an intermediate connecting layer 62. After the epoxy resin coating is sprayed on the surface of the intermediate connecting layer, an anti-corrosion layer is formed after curing. The peeling resistance between the anti-corrosion layer on the surface of the processed new sucker rod and the rod body can reach 16.25KN.

[0042] Further, as a specific embodiment, the components of the antioxidant polyurethane prepolymer include: in parts by weight, 20-35 parts of toluene diisocyanate, 2-5 parts of ethyl isocyanate acrylate, 10-15 parts of trans-3-hydroxypropylene boric acid pinacol ester, 10-18 parts of polyoxypropylene ether glycol, 2-5 parts of stannous octoate, 0.04-0.15 parts of 4-allyl-2-methoxyphenol, 1.4-3.5 parts of (ferrocenyl) hexanethiol, and 2-5 parts of triethylamine.

[0043] Furthermore, as a specific implementation method, the components of the phenolic coating layer include a base component and a curing agent. In terms of mass ratio, the ratio of the base component to the curing agent is 6:1, wherein the components include 60%-65% phenolic epoxy resin, 0.5%-1.0% dispersant, 25%-35% powdered particles, 0.5%-2% coupling agent, and 5%-10% graphene.

[0044] Furthermore, the particle size of the powder particles is less than or equal to 60 microns, and the components include 40%-60% mica iron oxide and 20%-50% titanium dioxide.

[0045] Specifically, the configuration steps of the basic component prepared by the above method include: dispersing the phenolic epoxy resin and the dispersant at a low temperature until they are uniform, adding titanium dioxide and fanning until they are uniform, and finally adding a coupling agent, mica iron oxide, and graphene and dispersing them at a high speed until the fineness is less than or equal to 60 microns to obtain the basic component, and then mixing the curing agent in a ratio of 5:1 between the basic component and the curing agent to obtain the phenolic epoxy coating. After high-temperature curing, the phenolic epoxy coating has good adhesion to the surface of the sucker rod body, and the adhesion can reach 23.3MPa.

[0046] Furthermore, the phenolic epoxy resin includes at least one of DEN431, DEN438, and EPALLOY 8240. In specific applications, the phenolic resin is usually selected from DEN431 and EPALLOY 8240, and the ratio of the two is 1: (0.3-0.5).

[0047] Furthermore, the coupling agent is GX-560.

[0048] Embodiment 3 The present invention also provides a novel method for producing an anti-corrosion sucker rod, referring to Figure 2 , specifically including the following steps: Step 1: forming a phenolic coating layer 621 on the surface of the sucker rod body after surface treatment; after degreasing and derusting the surface of the sucker rod body, spraying phenolic coating on the surface of the rod body, heating and drying the rod body to solidify the coating, thereby forming the phenolic coating layer 621; Step 2: According to the ratio, 75-95 parts of epoxy resin, 30-50 parts of antioxidant polyurethane prepolymer and 20-30 parts of graphene powder are weighed, evenly dispersed and placed in the reaction kettle cavity for stirring, and then 1-5 parts of curing agent are added and stirred evenly to obtain a coating, and then a predetermined thickness is evenly sprayed on the surface of the phenolic coating layer 621 by spraying, and then the sucker rod is placed at room temperature to cure the coating, and the coating is cured for 3 hours at room temperature of 25 degrees Celsius. The surface of the phenolic coating layer 621 still has a certain viscosity; Step three, spray epoxy resin coating on the surface of the middle connecting layer when it is not completely cured, and then heat and dry it in a heating furnace to solidify the material to form an epoxy resin layer 623. After the middle connecting layer is cured for 3 hours, spray epoxy resin coating on its surface. After spraying, place the sucker rod in the heating furnace and rotate the rod body, heat and cure for 30 minutes, so that the epoxy resin layer is solidified and firmly bonded to the middle connecting layer, thereby forming an anti-corrosion layer.

[0049] Furthermore, it also includes: Step 4: Detect leaks in the anti-corrosion layer on the surface of the sucker rod and repair the leaks.

[0050] Specifically, in order to further improve the performance of the anti-corrosion layer, after the anti-corrosion layer is formed on the sucker rod, it is left to stand for 7-15 days, and then the anti-corrosion layer on the surface of the sucker rod is tested for leaks, and the leaks are repaired.

[0051] Furthermore, as a specific implementation, the present application also includes a detection device, the detection device including: A conveying unit, used for conveying the sucker rod to be inspected; A detection component 1 is arranged at one end of the transmission unit; A leakage signal amplifier 3 is electrically connected to the detection component 1; The marking device 7 is connected to the marking device 7 and is arranged downstream of the detection component 1 along the conveying direction of the conveying unit.

[0052] Specifically, refer to Figure 3 , is a schematic diagram of the structure of the detection device for detecting the leakage point of the new sucker rod, in which the transmission unit uses a transmission roller 8, reference Figure 4-Figure 9 The detection component 1 includes an upper shell 10 and a lower shell 11 supported by plastic. The upper shell and the lower shell are hingedly connected by a hinge 115. A handle 101 and a buckle (not shown in the figure) are arranged on the other side. A channel 13 for the sucker rod 6 to pass through is arranged at the position where the upper shell and the lower shell are connected. A conductive component coaxially arranged with the channel 13 is arranged in the upper shell and the lower shell. The conductive component includes a rigid plate 15 arranged parallel to the axis of the channel 13. A guide rod 105 is vertically arranged on the rigid plate. The upper shell and the lower shell are both provided with a guide hole that cooperates with the guide rod 105 for guiding sliding sealing. The guide rod is an insulating rod. A limit plate 1 is arranged at the end of the guide rod 105 extending out of the guide hole 04, a compression spring 151 is sleeved on the guide rod 105, one end of the compression spring abuts against the end of the guide hole, and the other end abuts against the rigid plate 15. Along the axial direction of the channel 13, two positioning rollers 14 are arranged at intervals on one side of the rigid plate 15 close to the channel 13. The positioning roller 14 rotates with the rigid plate and the rotating shaft is perpendicular to the axis of the channel 13 and is located between the two positioning rollers 14. The rigid plate 15 is also provided with a water absorbing member 16, which includes an arc-shaped matching surface. The leakage point signal amplifier 3 includes a first terminal 31 and a second terminal 32. The second terminal is connected to the water absorbing member 16 of the two conductive components. Generally, the lower shell 11 is fixedly arranged. During detection, refer to Figure 2, open the upper shell 10, place the sucker rod to be tested on the conveying roller 8 and place the sucker rod in the channel 13, at this time, the positioning roller 14 of the conductive component arranged on the lower shell contacts the outer surface of the sucker rod, and the arc surface of the water absorbent 16 contacts the outer surface of the sucker rod, then merge the upper shell 10 with the lower shell, and snap-fit ​​connection, the positioning roller and the arc surface of the water absorbent arranged in the upper shell are connected to the upper side of the sucker rod, then the first terminal 31 contacts the area of ​​the end of the sucker rod that is not covered by the anti-corrosion layer, the conveying roller works to convey the sucker rod 6, continue to refer to Figure 3 The water absorbing member 16 is also connected to the water source 2. During the transmission process, the water source 2 supplies water to the water absorbing member 16, and the water can wet the surface of the sucker rod. When the epoxy resin layer on the outer surface of the sucker rod has a leak, water can penetrate the epoxy resin layer and enter into contact with the middle connecting layer of the inner layer. Since the middle connecting layer has a graphene component and has good conductivity, it can conduct electricity. At this time, the water penetrating through the leak point forms a connecting path, connecting the first terminal 31 and the second terminal 32, and amplified by the leakage signal amplifier 3. When the first terminal 31 and the second terminal are connected and energized, it is determined that the anti-corrosion layer of the current sucker rod has a leak in the area within the detection component 1 to achieve the detection effect.

[0053] The present application arranges a rigid plate 15, a guide rod 105 and a compression spring in a coordinated manner, so that the anti-corrosion layer of the sucker rod can be automatically adapted according to the radial size of the sucker rod when detecting the anti-corrosion layer of the sucker rod. The elasticity of the compression spring can ensure that the positioning roller 14 is in full contact with the outer surface of the sucker rod, ensure that the arc surface of the water absorbing part fits with the sucker rod, and ensure the accuracy of the detection.

[0054] Further, as a specific implementation, a conductive shell 160 is provided on the rigid plate 15, the water absorbing member 16 is provided at the opening position of the conductive shell 160, a water inlet pipe 102 connected to the interior is provided on the conductive shell, the water inlet pipe 102 is connected to the water source 2, and a conductive column 1030 is also provided on the side wall of the conductive shell, the conductive column is connected to a wire 103, and the wire 103 is electrically connected to the second terminal.

[0055] Further, in step 4, as a preferred embodiment, in order to facilitate the subsequent repair of the sucker rod leak area, when the anti-corrosion layer on the surface of the sucker rod is leaked, the area where the leak occurs on the surface of the sucker rod is marked. Figure 3As a preferred embodiment, the detection device also includes a marking device 7, which is connected to the leakage signal amplifier. The standard-reaching device can mark a predetermined area on the outer surface of the sucker rod according to the detection result of the leakage signal amplifier, and calibrate the leakage area, so as to facilitate the subsequent rapid positioning of the landing area for leak repair. The specific working steps are: when the leakage signal amplifier 3 detects a leakage point, it is determined that the area located in the upper shell and the lower shell of the sucker rod has a leakage point. At this time, the current transmission speed of the transmission roller 8 is obtained, and then according to the distance between the marking device 7 and the detection component 1, the starting position and the end area of ​​the area with leakage risk of the sucker rod are marked, so as to achieve the marking effect. As a preferred embodiment, the standard-reaching device can use an automatic marking device for ink press marking.

[0056] As a specific implementation, the material of the water absorbent is sponge. By being set as a sponge, it has compressibility, so it can deform itself and adapt to the outer surface of the sucker rod to achieve a better fitting effect.

[0057] As a preferred embodiment, preferably, an arc-shaped member 162 is fixedly provided on the surface of the conductive shell 160, a guide member 163 is provided on the rigid plate 15, an arc-shaped guide groove is provided on the guide member, the cross-section of the guide groove is T-shaped, the arc-shaped member and the guide groove are slidingly matched, and a reciprocating linear drive member 17 is also provided between the rigid plate 15 and the conductive shell 160, and both ends of the reciprocating linear drive member are hingedly connected to the rigid plate 15 and the conductive shell. During the detection work, the positioning roller 14 contacts and positions the surface of the sucker rod and compresses the compression spring 151. At this time, the axis of the arc-shaped member 162 is coaxial with the axis of the sucker rod and the axis of the channel 13. At this time, the reciprocating linear drive member 17 can reciprocate and telescopically drive the conductive shell 160, so that the conductive shell swings back and forth around the axis of the channel 13, so that the water absorbent member can swing back and forth and slide relative to the surface of the sucker rod, so that water can be better applied to the surface of the sucker rod, ensuring that every instability on the surface of the sucker rod is detected, and the detection accuracy is guaranteed.

[0058] Furthermore, when the anti-corrosion layer on the surface of the sucker rod is tested for leaks, since the surface of the sucker rod is coated with water by the water absorbing member 16, in the actual testing process, water still remains on the surface of the sucker rod after passing through the water absorbing member. At this time, after the sucker rod is transported out through the upper shell and the lower shell, there is still accumulated water on the outside, which is conductive. When the anti-corrosion layer of the sucker rod has a leak, the leak is coated with water when passing through the water absorbing member and is detected at this time. At this time, the initial area of ​​the mark is determined. When water remains on the surface of the sucker rod, the leak may also have a conductive effect when it is output from the upper shell and the lower shell. At this time, the leakage signal amplifier 3 also detects leakage, which causes the area marked by the marking device 7 to be too large, resulting in a large leak repair range in the later stage. In order to improve the accuracy of detection and positioning, as a preferred embodiment, reference is made to Figure 4-Figure 8 A semicircular flow limiting ring 12 is arranged around the channel 13 on the upper shell and the lower shell. The flow limiting ring is connected to a first negative pressure pipe 120. The first negative pressure pipe 120 is connected to a negative pressure pump (not shown in the figure). A plurality of adsorption micropores 121 are evenly spaced around the axis on the flow limiting ring. The adsorption micropores 121 are gathered and connected to the first negative pressure pipe 120. Through this arrangement, when leak point detection is performed, a negative pressure adsorption force is provided by the negative pressure pump (not shown in the figure). The water on the surface of the sucker rod passing through the flow limiting ring 121 is adsorbed by the adsorption micropores 121, thereby achieving the effect of adsorbing water flow on the surface of the sucker rod, avoiding water overflow, and improving the accuracy of positioning.

[0059] Further, as a specific implementation method, refer to Figure 9-14 Each conductive component includes two positioning rollers 14, and a control valve is provided at the end of one of the positioning rollers 14. The control valve includes a valve body 18 that is detachably fixedly connected to the rigid plate 15. A valve cavity is coaxially arranged with the roller shaft of the positioning roller in the valve body 18. A connecting pipe 181 is arranged at one end of the valve cavity. The other end of the connecting pipe 181 is connected to the first negative pressure pipe 120. Along the axial direction, two connecting ports 182 are arranged at intervals on the outer wall of the valve body. The outer peripheral surface of the roller shaft of the positioning roller is slidably sealed with the inner peripheral surface of the valve cavity; along the cross section passing through one connecting port 182, a first annular groove 142 and a second annular groove 143 that are not connected to each other are arranged on the outer peripheral surface of the roller shaft; along the cross section passing through the other connecting port 182, the roller A third annular groove 144 and a fourth annular groove 145 which are not connected to each other are also provided on the outer circumferential surface of the shaft. Along the axial direction, the projections of the first annular groove 142 and the fourth annular groove 145 on the end surface of the roller shaft coincide with each other, and the projections of the third annular groove 144 and the second annular groove 143 on the end surface of the roller shaft coincide with each other. A first connecting flow channel 146 connecting the first annular groove 142 and the third annular groove 144, and a second connecting flow channel 147 connecting the second annular groove 143 and the fourth annular groove 145 are provided inside the roller shaft. The first connecting flow channel and the second connecting flow channel are not connected to each other, and a blind groove 149 connecting the valve cavity and the first connecting flow channel 146 is provided at the end of the roller shaft, and a discharge channel 148 connecting the atmosphere and the second connecting flow channel 147 is provided inside the roller shaft.

[0060] The reciprocating linear drive member 17 includes a piston cylinder, a piston 171 disposed in the piston cylinder, and a piston rod 172 guided and disposed at the end of the piston cylinder. The two ends of the piston cylinder are respectively provided with a first port 173 and a second port 174. The first port is connected to a connecting port 182 through a second negative pressure pipe 175, and the second port 174 is connected to another connecting port 182 through a third negative pressure pipe 176. One end of the piston cylinder is hingedly connected to the rigid plate 15, and the end of the piston rod is hingedly connected to the conductive shell. The hinge axes of the two hinged parts are parallel to the axis of the channel 13. Fig.10 , Fig.11, through the above-mentioned arrangement, when the sucker rod anti-corrosion layer is inspected, the sucker rod is driven by the transmission roller 8, and the sucker rod can drive the positioning roller 14 to rotate when passing through the positioning roller 14. When the positioning roller rotates, the negative pressure pump (not shown in the figure) starts to work, and the water source 2 also starts to supply water. At this time, negative pressure is provided to the inside of the valve cavity in the valve body 18. At this time, there is negative pressure in the first annular groove 142 and the third annular groove 144, and the second annular groove 143 and the fourth annular groove 145 are connected to the atmosphere. When the roller shaft of the positioning roller 14 rotates, the first annular groove and the second annular groove alternately pass through one connecting port 182, and the third annular groove and the fourth annular groove alternately pass through another connecting port 182. Fig.10 When the first annular groove 142 is connected to the left connecting port 182, the other connecting port 182 on the right is connected to the atmosphere, then the second port 174 is connected to the atmosphere, and the second port 173 is connected to the negative pressure pump (not shown in the figure), then the state of the reciprocating linear drive member 17 is as follows: Fig.12 As shown, with the rotation of the roller shaft, the second annular groove and the third annular groove are connected to the two connecting ports 182 respectively, and the first port 173 is connected to the atmosphere, and the second port is connected to the negative pressure pump (not shown in the figure). At this time, the piston is pushed downward by the action of the air pressure, and the reciprocating linear drive rod is extended. With the continuous rotation of the roller shaft, when the first annular groove 142 is connected to the left connecting port 182, the other connecting port 182 on the right is connected to the atmosphere, and the second port 174 is connected to the atmosphere, and the first port 173 is connected to the negative pressure pump (not shown in the figure). At this time, the piston pushes the piston 171 upward under the push of the air pressure, pulling the piston rod to contract, and so on, so that the linear drive rod 17 reciprocates and drives the conductive shell 160.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A novel anti-corrosion sucker rod, comprising a rod body (61) and an anti-corrosion layer (62) arranged on the outer surface of the rod body (61), characterized in that: The anti-corrosion layer (62) comprises: A phenolic coating layer (621), an epoxy resin layer (623), and an intermediate connecting layer (622) disposed therebetween, wherein the intermediate connecting layer (622) is made of materials comprising, by weight, 75-95 parts of epoxy resin, 30-35 parts of antioxidant polyurethane prepolymer, and 20-30 parts of graphene.

2. A novel anti-corrosion sucker rod according to claim 1, characterized in that: The components of the antioxidant polyurethane prepolymer include: in parts by weight, 20-35 parts of toluene diisocyanate, 2-5 parts of ethyl isocyanate acrylate, 10-15 parts of trans-3-hydroxypropylene boric acid pinacol ester, 10-18 parts of polyoxypropylene ether glycol, 2-5 parts of stannous octoate, 0.04-0.15 parts of 4-allyl-2-methoxyphenol, 1.4-3.5 parts of (ferrocenyl) hexanethiol, and 2-5 parts of triethylamine.

3. The novel anti-corrosion sucker rod according to claim 1 is characterized in that: The components of the phenolic coating layer include a basic component and a curing agent. According to the mass ratio, the ratio of the basic component to the curing agent is 6:1, wherein the basic component includes 60%-65% of phenolic epoxy resin, 0.5%-1.0% of dispersant, 25%-35% of powdered particles, 0.5%-2% of coupling agent, and 5%-10% of graphene.

4. The novel anti-corrosion sucker rod according to claim 3 is characterized in that: The particle size of the powder particles is less than or equal to 60 microns, and the components include 40%-60% of mica iron oxide and 20%-50% of titanium dioxide.

5. The novel anti-corrosion sucker rod according to claim 4 is characterized in that: The phenolic epoxy resin includes at least one of DEN431, DEN438 and EPALLOY8240.

6. The novel anti-corrosion sucker rod according to claim 5 is characterized in that: The coupling agent is GX-560.

7. A novel method for producing an anti-corrosion sucker rod, characterized in that: The following steps are involved: Step 1: forming a phenolic coating layer (621) on the surface of the sucker rod body after surface treatment; Step 2, forming an intermediate connection layer (622), preparing materials according to a ratio, adding the prepared materials to a spraying device, and spraying the materials on the surface of the phenolic coating layer (621) to form an intermediate connection layer, wherein the components of the material of the intermediate connection layer (622) include: in parts by weight, 75-95 parts of epoxy resin, 30-35 parts of antioxidant polyurethane prepolymer, and 20-30 parts of graphene; Step 3: When the intermediate connection layer is not completely cured, epoxy resin coating is sprayed on its surface, and then placed in a heating furnace for heating and drying to cure the material and form an epoxy resin layer (23).

8. The method for producing a novel anti-corrosion sucker rod according to claim 7, characterized in that: Also includes: Step 4: Detect leaks in the anti-corrosion layer on the surface of the sucker rod and repair the leaks.

9. The method for producing a novel anti-corrosion sucker rod according to claim 8, characterized in that: In step 4, when the anti-corrosion layer on the surface of the sucker rod is tested for leaks, the area on the surface of the sucker rod where the leaks occur is marked.

10. The method for producing a novel anti-corrosion sucker rod according to claim 7, characterized in that: The invention comprises a detection device, wherein the detection device comprises: A conveying unit, used for conveying the sucker rod to be inspected; A detection component (1) is arranged at one end of the transmission unit; A leakage point signal amplifier (3) is electrically connected to the detection component (1); The marking device (7) is connected to the marking device (7) and is arranged downstream of the detection component (1) along the conveying direction of the conveying unit.

Images