Tungsten-plated oil pipe oil extraction equipment

Abstract

The invention discloses tungsten-plated oil pipe oil extraction equipment, and relates to the technical field of oil extraction equipment, the tungsten-plated oil pipe oil extraction equipment comprises an equipment main body, an oil pipe main body and a sacrificial anode layer which is arranged on the outer surface of the oil pipe main body and formed through casting, and gaps are reserved between the two end parts of the sacrificial anode layer and the two end parts of the corresponding oil pipe main body respectively; a potential difference sensor is mounted on the oil pipe body; the high-temperature nondestructive testing probe is arranged on the oil pipe body, the potential difference sensor is sensitive to micron-grade damage of a coating, compared with a traditional coupon method or regular detection, local corrosion is found in advance, corrosion is prevented from spreading to a base body, a remote transmission function is combined, a corrosion hot spot map can be displayed in a control center in real time, and the sudden leakage risk is greatly reduced; the solid reference electrode and the active cooling probe solve the problems of high-temperature misalignment and ultrasonic probe signal attenuation of a conventional electrochemical sensor, are suitable for severe environments such as deep oil and gas wells and geothermal wells, and expand the application boundary of a corrosion monitoring technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil extraction equipment, and in particular to a tungsten-plated and infiltrated oil pipe oil extraction equipment. BACKGROUND

[0002] Oil extraction equipment is a key tool and technical means for extracting crude oil and natural gas from underground reservoirs. With the increasing global demand for energy and the continuous progress of technology, oil extraction equipment has undergone significant development and innovation. In high-temperature, high-pressure and strongly corrosive environments such as deep oil and gas wells and geothermal wells, oil pipes are prone to localized corrosion, stress corrosion cracking and hydrogen embrittlement during long-term service, which seriously threatens the safe operation of the oil extraction system. Traditional corrosion monitoring methods mainly rely on periodic sampling and detection, coupon corrosion testing or offline ultrasonic thickness measurement, which have the problems of long detection cycle, delayed response and inability to reflect the localized corrosion dynamics in real time, making it difficult to detect small defects in the early stages of corrosion and leading to the spread of corrosion to the base metal, even causing sudden leakage accidents and posing serious safety and environmental risks.

[0003] Currently, some sites have begun to use electrochemical sensors for online corrosion monitoring, but conventional reference electrodes mostly use liquid electrolyte structures, which are prone to problems such as electrolyte evaporation, potential drift and response failure in high-temperature environments, leading to inaccurate measurements. At the same time, traditional ultrasonic probes have severe signal attenuation in high-temperature media, making it difficult to achieve long-term stable monitoring. In addition, existing monitoring systems generally lack sensitivity to small plating layer damage, cannot accurately locate the corrosion initiation point, and do not have remote real-time warning capabilities, limiting their application in unattended or deep well complex conditions. SUMMARY

[0004] The present application provides a tungsten-plated and infiltrated oil pipe oil extraction equipment, which solves the problem of lack of sensitivity to small plating layer damage in the prior art, inability to accurately locate the corrosion initiation point, and lack of remote real-time warning capability, limiting its application in unattended or deep well complex conditions.

[0005] The present application provides a tungsten-plated and infiltrated oil pipe oil extraction equipment, which includes a device main body, an oil pipe main body and a cast sacrificial anode layer provided on the outer surface of the oil pipe main body. The two ends of the sacrificial anode layer are respectively spaced apart from the two ends of the oil pipe main body by a gap. A potential difference sensor is installed on the oil pipe main body. A high-temperature non-destructive testing probe is provided on the oil pipe main body. A data processing unit is provided on the oil pipe main body.

[0006] Further, the reference electrode of the potential difference sensor is a high-temperature-resistant solid-state Ag / AgCl electrode, the high-temperature nondestructive detection probe is installed on the oil pipe body through a sleeve, the high-temperature nondestructive detection probe is provided with an active cooling channel, the inner wall of the oil pipe body is provided with a tungsten alloy composite coating, the tungsten alloy composite coating sequentially comprises an amorphous structure layer, a layered crystal layer and a columnar crystal layer from inside to outside, the electrode potential of the layered crystal layer is higher than that of the amorphous structure layer, and the electrode potential of the amorphous structure layer is higher than that of the columnar crystal layer.

[0007] Further, the sacrificial anode layer is a zinc-based alloy; and includes the following components in mass fraction: 20%-40% metal nanoparticles, 0.5%-2% carbon nanoparticles, 0.1%-0.2% magnesium, 0.2%-0.25% manganese, 0.05%-0.1% indium, 0.2%-0.3% chromium, 0.08%-0.12% cerium, and 0.06%-0.1% tin, and the balance is zinc.

[0008] Further, the metal nanoparticles are 10%-20% cobalt, 5%-10% nickel and 5%-10% copper, and the balance is impurities; the particle size of the metal nanoparticles is 1-100 nm.

[0009] Further, the carbon nanoparticles are carbon quantum dots or nitrogen-doped carbon quantum dots.

[0010] Further, the preparation method of the oil pipe body comprises the following steps: S1, preparing an oil pipe body; S2, preparing a liquid melt of a sacrificial anode layer; the temperature of the liquid solution is 500-600 DEG C; S3, casting the sacrificial anode layer on the surface of the oil pipe body by an extrusion casting process; the pressure parameter of the die casting is 30-40 MPa; S4, pickling the surface of the oil pipe sacrificial anode layer to remove impurities and roughen the surface, then placing the oil pipe in a 300-700 g / L sodium tungstate solution, heating to 250-300 DEG C, pressurizing to 10-30 MPa, and maintaining for 15-20 h to form a tungsten-plated and infiltrated oil pipe; S5, cleaning and drying the oil pipe after tungsten plating and infiltration.

[0011] Further, before pickling the surface of the oil pipe sacrificial anode layer in step S4, a carbon source solution is coated on the surface of the sacrificial anode layer, the surface is rinsed and dried after pickling, and then tungsten plating and infiltration are performed.

[0012] Further, the carbon source solution is a saturated glucose solution.

[0013] Further, the carbon source solution further contains cobalt nanoparticles.

[0014] Further, the cobalt nanoparticles have a particle size of 1-50 nm, and the mass ratio of the cobalt nanoparticles to the carbon source is 1: (3-5).

[0015] Further, the acid pickling is followed by magnetization.

[0016] Further, the acid pickling in step S4 includes two times, the first acid pickling uses 50% sulfuric acid for 0.1-5 h, and the second acid pickling uses 95% sulfuric acid for 0.1-2 h.

[0017] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: Firstly, the metal nanoparticles and the carbon nanoparticles can refine the grain structure of the sacrificial anode layer, the refined grains can improve the mechanical properties and corrosion resistance of the material, and at the same time provide more channels and active sites for the infiltration of tungsten elements; the uniform dispersion of the nanoparticles in the sacrificial anode layer forms a more dense tungsten plating and infiltration layer, and the interaction between the nanoparticles and the tungsten elements promotes the diffusion and infiltration process of tungsten in the anode layer, thereby improving the plating and infiltration efficiency and the quality of the plating layer; the tungsten element itself has good high-temperature resistance, and the plating and infiltration treatment of tungsten can significantly improve the stability and durability of the oil pipe body in a high-temperature environment.

[0018] Secondly, the glucose molecules in the saturated glucose solution will undergo dehydration, carbonization and other chemical reactions with sulfuric acid, thereby forming tiny carbon nanoparticles, i.e. carbon dots, on the surface of the anode layer. These carbon dots usually have a nanoscale size, enhance the adhesion between the subsequent tungsten plating and infiltration layer and the anode layer, improve the stability and durability of the plating layer, increase the roughness of the anode layer surface, and are conducive to the penetration and diffusion of tungsten ions, thereby improving the quality and uniformity of the tungsten plating and infiltration layer. The carbon dots are attached to the surface of the anode layer by physical adsorption and chemical bonding, change the surface morphology and chemical composition thereof, and provide a good foundation for subsequent processing. Moreover, zinc, cobalt, nickel and copper all have a certain adsorption capacity for glucose, so that more carbon dots are attached to the metal surface after the reaction. The carbon dots also reduce the interfacial defects and stress concentration phenomenon between the tungsten plating and infiltration layer and the anode layer, improve the density and uniformity of the plating layer, and improve the corrosion resistance of the entire anode layer system. The carbon dot layer can improve the wettability and electrical conductivity of the anode layer surface, which is conducive to the subsequent coating or plating process.

[0019] Thirdly, the cobalt nanoparticles have the effect of catalyst, accelerate the carbonization process of carbon sources such as glucose in the pickling process, promote the formation of carbon dots, the carbon dots are attached to the surface of the sacrificial anode layer and chelate with the cobalt nanoparticles to form a uniform carbon dot layer; the addition of cobalt nanoparticles changes the roughness and pore structure of the surface of the sacrificial anode layer, provides more active sites for the attachment of carbon dots, and is beneficial to the uniform distribution and firm attachment of carbon dots; the cobalt nanoparticles and carbon dots chelate in the acidic environment to form a stable complex, enhance the adhesion strength of the carbon dots on the surface of the sacrificial anode layer, and improve the stability and effect of the tungsten plating and infiltration operation.

[0020] Fourthly, the particle size distribution of the carbon dots will affect the penetration and diffusion behavior in the plating and infiltration process, smaller carbon dots are more easily penetrated into the substrate to form a deeper plating layer; while larger carbon dots are more likely to stay on the surface to form a thicker outer layer, forming a plating layer with gradient performance, that is, the inner layer has better adhesion and corrosion resistance, and the outer layer has higher hardness and wear resistance.

[0021] Fifthly, the potential difference sensor is sensitive to micron-level damage of the plating layer, which can detect local corrosion earlier than the traditional coupon method or periodic detection, avoid the spread of corrosion to the substrate, and combine the remote transmission function to display the corrosion hot spot map in real time in the control center, greatly reduce the risk of sudden leakage, and the solid reference electrode and active cooling probe solve the problems of high temperature misalignment of conventional electrochemical sensors and signal attenuation of ultrasonic probes, and are suitable for harsh environments such as deep oil and gas wells and geothermal wells, and expand the application boundary of corrosion monitoring technology. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which: Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a detection schematic diagram of the fifth embodiment of the present application.

[0023] In the drawings, the component list represented by each reference numeral is as follows: 10, equipment body; 20, oil pipe body. DETAILED DESCRIPTION

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application belongs; the terms used herein in the specification are only for the purpose of describing specific embodiments and are not intended to limit the application; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] Embodiment one: a tungsten-plated oil pipe production device, comprising a device main body 10, a pipe main body 20, and a cast-formed sacrificial anode layer arranged on the outer surface of the pipe main body 20, the two ends of the sacrificial anode layer are respectively spaced apart from the two ends of the pipe main body 20, a potential difference sensor is arranged on the pipe main body 20, a high-temperature non-destructive testing probe is arranged on the pipe main body 20, and a data processing unit is arranged on the pipe main body 20.

[0026] It should be noted that the high-temperature non-destructive testing probe comprises an ultrasonic phased array probe and a magnetic flux leakage testing probe, which are used to scan the plating layer wall thickness and crack defects in real time, the potential difference sensor comprises a plurality of reference electrodes and working electrodes, which are used to detect the surface potential gradient and galvanic current of the pipe, the data processing unit is used to receive the sensor signal, fit the charge transfer resistance (Rct) and double-layer capacitance (Cdl) through an equivalent circuit model, and calculate the corrosion rate based on the Tafel slope.

[0027] The reference electrode of the potential difference sensor is a high-temperature-resistant solid-state Ag / AgCl electrode, the high-temperature non-destructive testing probe is installed on the pipe main body 20 through a sleeve, the high-temperature non-destructive testing probe is provided with an active cooling channel, the inner wall of the pipe main body 20 is provided with a tungsten alloy composite plating layer, the tungsten alloy composite plating layer comprises, from inside to outside, an amorphous structure layer, a layered crystal layer, and a columnar crystal layer, the electrode potential of the layered crystal layer is higher than that of the amorphous structure layer, and the electrode potential of the amorphous structure layer is higher than that of the columnar crystal layer.

[0028] It should be noted that inert gas is circulated to reduce the temperature in the active cooling channel, and the working temperature of the probe is maintained at ≤300°C.

[0029] Working principle: based on the unique layered structure (amorphous layer → layered crystal layer → columnar crystal layer) of the tungsten-plated pipe, a natural potential gradient is formed between the layers due to the difference in crystal structure and element enrichment, and the interlayer potential deviation and galvanic current are captured in real time through an embedded potential difference sensor array, when local corrosion damages the integrity of the plating layer, the potential gradient changes suddenly (such as the potential difference between the layered crystal layer and the columnar crystal layer rises sharply), and the system identifies the corrosion active area and the corrosion type (such as pitting preferentially breaks through the columnar layer) accordingly.

[0030] The high-temperature non-destructive testing probe adopts a dual-mode cooperation of a lithium niobate piezoelectric material ultrasonic probe and a samarium-cobalt permanent magnet magnetic flux leakage probe, emits high-frequency sound waves to penetrate the plating layer, determines the wall thickness thinning and micro-cracks according to the time difference and amplitude attenuation of the echo, and captures the magnetic field distortion caused by corrosion defects after magnetizing the pipe wall.

[0031] The micrometer-level damage of the coating layer is sensitive to the potential difference sensor, local corrosion is found earlier than the traditional hanging piece method or periodic detection, and the corrosion is prevented from spreading to the substrate, combined with the remote transmission function, the corrosion hot spot map can be displayed in real time in the control center, the risk of sudden leakage is greatly reduced, the solid reference electrode and the active cooling probe solve the problems of high temperature misalignment of conventional electrochemical sensors and signal attenuation of ultrasonic probes, and are suitable for harsh environments such as deep oil and gas wells and geothermal wells, and the application boundary of the corrosion monitoring technology is expanded.

[0032] In the embodiment two, the sacrificial anode layer is a zinc-based alloy, and includes the following components by mass fraction: 20%-40% metal nanoparticles, 0.5%-2% carbon nanoparticles, 0.1%-0.2% magnesium, 0.2%-0.25% manganese, 0.05%-0.1% indium, 0.2%-0.3% chromium, 0.08%-0.12% cerium, and 0.06%-0.1% tin, and the balance is zinc. The metal nanoparticles are 10%-20% cobalt, 5%-10% nickel, and 5%-10% copper, and the balance is impurities; the particle size of the metal nanoparticles is 1-100 nm. The carbon nanoparticles are carbon quantum dots or nitrogen-doped carbon quantum dots. A tungsten-plated and infiltrated oil pipe production equipment, and a preparation method of the oil pipe body includes the following steps: S1, preparing the oil pipe body 20; S2, preparing a liquid melt of the sacrificial anode layer; the temperature of the liquid solution is 500-600°C; S3, casting the sacrificial anode layer on the surface of the oil pipe body 20 by an extrusion casting process; the pressure parameter of the pressure casting is 30-40 MPa; S4, performing pickling on the surface of the oil pipe sacrificial anode layer to remove impurities and roughen the surface, and then placing the oil pipe in a 300-700 g / L sodium tungstate solution, heating to 250-300°C, and increasing the pressure to 10-30 MPa, and maintaining for 15-20 h to form a tungsten-plated and infiltrated oil pipe; S5, cleaning and drying the tungsten-plated and infiltrated oil pipe.

[0033] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: The metal nanoparticles and the carbon nanoparticles can refine the grain structure of the sacrificial anode layer, the refined grains can improve the mechanical properties and corrosion resistance of the material, and provide more channels and active sites for the infiltration of tungsten elements; The uniform dispersion of the nanoparticles in the sacrificial anode layer forms a more dense tungsten-plated and infiltrated layer, and the interaction between the nanoparticles and the tungsten elements promotes the diffusion and infiltration process of tungsten in the anode layer, thereby improving the plating and infiltration efficiency and the quality of the coating layer; The addition of nanoparticles improves the bonding force between the anode layer and the tubing body 20 and the bonding force between the anode layer and the tungsten plating layer, and improves the stability and durability of the entire tubing system; The tungsten element itself has good high-temperature resistance, and the plating layer formed by the tungsten plating and infiltration treatment can significantly improve the stability and durability of the tubing body 20 in a high-temperature environment; The metal nanoparticles make the carbon nanoparticles uniformly dispersed in the zinc-based alloy, prevent the agglomeration of the carbon nanoparticles, and thus improve the overall performance of the sacrificial anode layer. The interaction between the nanoparticles enhances the interface bonding force between the carbon nanoparticles and the zinc-based alloy matrix, and improves the stability of the carbon nanoparticles in the sacrificial anode layer; The addition of nanoparticles can significantly refine the grains of the zinc-based alloy, including carbon nanoparticles and metal nanoparticles. The refined grains improve the mechanical properties and corrosion resistance of the alloy; The main function of the sacrificial anode layer is to provide electrochemical protection to prevent corrosion of the tubing body 20. The addition of nanoparticles changes the electrochemical properties of the anode layer and improves the open-circuit potential of the anode, thereby enhancing its corrosion protection effect; The carbon nanoparticles promote the reaction activity of the anode layer in the electrolyte solution and accelerate the sacrificial process of the anode, thereby more effectively protecting the tubing body 20; The sacrificial anode layer protects the tubing body 20 from corrosion by sacrificing itself. The addition of nanoparticles significantly improves the corrosion resistance of the anode layer, prolongs the service life of the tubing, and the refinement of the grains improves the strength and toughness of the sacrificial anode layer, enabling it to better withstand mechanical stress in the oil well. The optimization of the electrochemical properties of the anode layer by the nanoparticles enables it to more efficiently provide cathodic protection current, reducing the corrosion rate of the tubing body 20; The improvement in corrosion resistance directly prolongs the service life of the tubing, reduces the frequency and cost of replacement, reduces the downtime caused by tubing corrosion, and improves the overall production efficiency of the oilfield. The sacrificial anode protection method is an environmentally friendly and safe corrosion prevention method. The waste can be recycled or harmlessly treated, without causing environmental pollution.

[0034] The corrosion degree and potential of the tubing prepared in this embodiment were detected for multiple groups of samples. A comparative sample was designed, which differed from the embodiment in that the comparative sample did not contain metal nanoparticles. The composition of each group of samples is shown in Table 1: Table 1

[0035] The temperature of the liquid solution in step S2 was 500°C, the pressure parameter of the die casting in step S3 was 37MPa, the temperature in step S4 was 300°C, the pressure was 20MPa, and the holding time was 15h; the concentration of the sodium tungstate solution was 500g / L; the detection results are shown in Table 2: Table 2

[0036] Example Three: The above examples add metal nanoparticles to the sacrificial anode to increase the stability of carbon nanoparticles in the sacrificial anode layer, concentrate carbon nanoparticles on the surface of the sacrificial anode layer to increase its corrosion resistance, perform a carbon nanoparticle coating reaction on the surface, and further improve on the basis of Example One.

[0037] In step S4, before pickling on the surface of the oil pipe sacrificial anode layer, a carbon source solution is coated on the surface of the sacrificial anode layer, then 95% sulfuric acid is used for pickling, the surface is rinsed and dried after pickling, and then a tungsten plating and infiltration operation is performed; The carbon source solution is a saturated glucose solution.

[0038] The technical solutions in the above examples of the present application have at least the following technical effects or advantages: In the pickling process, glucose molecules in the saturated glucose solution will undergo dehydration, carbonization and other chemical reactions with sulfuric acid, thereby forming tiny carbon nanoparticles, i.e. carbon dots, on the surface of the anode layer. These carbon dots usually have nanoscale sizes, enhancing the adhesion between the subsequent tungsten plating and infiltration layer and the anode layer, improving the stability and durability of the plating layer, increasing the roughness of the surface of the anode layer, and facilitating the penetration and diffusion of tungsten ions, thereby improving the quality and uniformity of the tungsten plating and infiltration layer, The carbon dots are attached to the surface of the anode layer by physical adsorption and chemical bonding, changing the surface morphology and chemical composition and providing a good foundation for subsequent processing. Zinc, cobalt, nickel, and copper all have a certain adsorption capacity for glucose, so that more carbon dots are attached to the metal surface after the reaction. It also reduces the interfacial defects and stress concentration phenomenon between the tungsten plating and infiltration layer and the anode layer, improving the density and uniformity of the plating layer. The carbon dots themselves may have certain corrosion resistance, improving the corrosion resistance of the entire anode layer system. The carbon dot layer can improve the wettability and electrical conductivity of the surface of the anode layer, which is conducive to the subsequent coating or plating process.

[0039] According to the detection method of Example One, the oil pipe of the present example is detected. The sample composition is 15% cobalt, 7% nickel, 7% copper, 0.08% tin, 0.15% magnesium, 0.25% manganese, 0.05% indium, 0.25% chromium, 0.1% cerium, 2% carbon nanoparticles, and the rest is zinc. The detection results are shown in Table 3: Table 3

[0040] Example four: further improve the corrosion resistance of the oil pipe by coating the sugar before pickling to increase the corrosion resistance of the oil pipe, and further improve the adhesion of the carbon dots on the surface of the sacrificial anode layer of the oil pipe based on example two.

[0041] The added carbon source solution also contains cobalt nanoparticles with a particle size of 1-50 nm, and the mass ratio of cobalt nanoparticles to carbon source is 1:(3-5); After pickling, the sacrificial anode layer containing cobalt metal in the oil pipe and its surface are partially magnetized or completely magnetized.

[0042] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: The cobalt nanoparticles have the effect of a catalyst, accelerating the carbonization process of carbon sources such as glucose during pickling, promoting the formation of carbon dots, and the carbon dots adhere to the surface of the sacrificial anode layer and chelate with the cobalt nanoparticles to form a uniform carbon dot layer; change the roughness and pore structure of the surface of the sacrificial anode layer to provide more active sites for the adhesion of carbon dots, which is conducive to the uniform distribution and firm adhesion of carbon dots; The cobalt nanoparticles and carbon dots chelate in an acidic environment to form a stable complex, enhancing the adhesion strength of the carbon dots on the surface of the sacrificial anode layer, improving the stability and effect of the tungsten plating and infiltration operation; improve the adhesion between the tungsten plating and infiltration layer and the sacrificial anode layer, reduce the risk of plating layer peeling, at the same time, the carbon dot layer improves the wettability of the anode layer surface, which is conducive to the penetration and diffusion of tungsten ions, and improves the quality and uniformity of the tungsten plating and infiltration layer; slow down the corrosion rate of the anode layer in harsh environments, at the same time, the addition of cobalt nanoparticles enhances the corrosion resistance of the anode layer, prolonging the service life of the oil pipe; The cobalt nanoparticles, as a material with good electrical conductivity, improve the electrical conductivity of the surface of the anode layer, which is conducive to the transmission of electrons in the electrochemical corrosion process, thereby improving the corrosion prevention effect of the sacrificial anode method; The pickling is followed by a magnetizing process, which makes the cobalt nanoparticles and carbon dot layer magnetic; better control the charge distribution and current flow direction on the surface of the anode layer during subsequent processing, further improve the corrosion prevention effect of the sacrificial anode layer, and the sacrificial anode layer also contains cobalt nanoparticles, making the sacrificial anode layer also magnetic, increasing the adhesion of the carbon dots, and prolonging the service life by extending the adhesion time.

[0043] According to the detection method of example one, the oil pipe of this example is detected, and the sample composition is 15% cobalt, 7% nickel, 7% copper, 0.08% tin, 0.15% magnesium, 0.25% manganese, 0.05% indium, 0.25% chromium, 0.1% cerium, 2% carbon nanoparticles, and the rest is zinc. The detection results are shown in Table 4: Table 4

[0044] Example five: by adding cobalt nanoparticles in the carbon source and magnetizing, the cobalt nanoparticles and carbon dot layer have a certain magnetism, increase the adhesion ability of carbon dots, and prolong the service life by prolonging the adhesion time, to improve its existing application, further improve on the basis of example three.

[0045] The acid pickling in step S4 also includes two times, the first acid pickling uses 50% sulfuric acid, and the time is 0.1-5h; The second acid pickling uses 95% sulfuric acid, and the time is 0.1-2h; The technical solutions in the embodiments of the application have at least the following technical effects or advantages: The first acid pickling uses low-concentration sulfuric acid, which makes the surface of the sacrificial anode layer generate uniform carbon dots, and the growth of the carbon dots is slow, so that small and uniform carbon dots are generated within a certain time, forming a more dense and flat surface covering layer, reducing defects and pores on the surface of the tungsten-plated and infiltrated oil pipe, and improving the overall corrosion resistance and wear resistance; The second acid pickling uses high-concentration sulfuric acid, which makes the carbon dots grow faster, have different sizes, and grow faster, so that the overall particle size is slightly larger, and the uneven carbon dots increase the surface roughness and form more "anchoring points", enhancing the bonding force between the plating layer and the substrate; The particle size distribution of the carbon dots affects the penetration and diffusion behavior in the plating and infiltration process, smaller carbon dots are more likely to penetrate into the substrate and form a deeper plating layer, while larger carbon dots are more likely to stay on the surface and form a thicker outer layer, forming a plating layer with gradient properties, i.e. the inner layer has better bonding force and corrosion resistance, and the outer layer has higher hardness and wear resistance; Small and uniform carbon dot plating layer can more effectively block the invasion of corrosive media and improve the corrosion resistance of the oil pipe; Uneven carbon dot plating layer can form a more complex corrosion barrier to further extend the service life of the oil pipe; Thick carbon dot plating layer can directly withstand wear and tear to protect the inner layer from damage; Larger carbon dots form harder protrusions, reducing the direct contact area between the oil pipe and other components, thereby reducing the wear rate; Layered particle size distribution forms a more secure bond between the plating layer and the substrate, reducing the risk of plating layer detachment; Uneven carbon dots in the outer layer enhance the bonding force with the substrate through mechanical locking action; The uniformity of the particle size of the carbon dots is controlled by the concentration of sulfuric acid, and the overall particle size of the carbon dots is controlled by the acid washing time to control the distribution of tungsten; the first acid washing time is divided into 0.1-1h, 1h-2.5h, 2.5h-5h, the second acid washing time is 0.1-0.5h, 0.5-1h, 1h-2h, each of the three different time stages controls the particle size to affect the distribution of tungsten, so as to control the overall performance of the tungsten-plated and infiltrated oil pipe and the individual needs.

[0046] The detection was carried out according to the method of Example 2, and the results are shown in Table 5: Table 5

[0047] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A WOLG (Wet Oil Lube Galvanic) device comprising a device main body (10), a tubing main body (20), and a cast sacrificial anode layer provided on the outer surface of the tubing main body (20), both end portions of the sacrificial anode layer being spaced apart from both end portions of the tubing main body (20), respectively, characterized in that, The oil pipe body (20) is provided with a potential difference sensor; The oil pipe body (20) is provided with a high-temperature non-destructive testing probe; The oil pipe body (20) is provided with a data processing unit.

2. The tungsten-plated and infiltrated oil pipe production equipment according to claim 1, wherein the reference electrode of the potential difference sensor is a high-temperature-resistant solid Ag / AgCl electrode, the high-temperature non-destructive testing probe is installed on the oil pipe body (20) through a sleeve, the high-temperature non-destructive testing probe is provided with an active cooling channel, the inner wall of the oil pipe body (20) is provided with a tungsten alloy composite coating, the tungsten alloy composite coating is sequentially provided with an amorphous structure layer, a layered crystal layer and a columnar crystal layer from inside to outside, the electrode potential of the layered crystal layer is higher than that of the amorphous structure layer, and the electrode potential of the amorphous structure layer is higher than that of the columnar crystal layer.

3. The tungsten-plated and infiltrated oil pipe production equipment according to claim 1, wherein the sacrificial anode layer is a zinc-based alloy and comprises the following components in mass fraction: 20%-40% metal nano-particles, 0.5%-2% carbon nano-particles, 0.1%-0.2% magnesium, 0.2%-0.25% manganese, 0.05%-0.1% indium, 0.2%-0.3% chromium, 0.08%-0.12% cerium and 0.06%-0.1% tin, and the balance is zinc.

4. A WDPF as defined in claim 3 wherein, The metal nano-particles are 10%-20% cobalt, 5%-10% nickel and 5%-10% copper, and the balance is impurities; the particle size of the metal nano-particles is 1-100 nm.

5. A WDPF as defined in claim 3 wherein, The carbon nano-particles are carbon quantum dots or nitrogen-doped carbon quantum dots.

6. A WDPF as recited in claim 1, wherein The preparation method of the oil pipe body (20) comprises the following steps: S1, preparing an oil pipe body (20); S2, preparing a liquid melt of a sacrificial anode layer; the temperature of the liquid solution is 500-600 ℃; S3, casting the sacrificial anode layer on the surface of the oil pipe body (20) through an extrusion casting process; the pressure parameter of the die casting is 30-40 MPa; S4, pickling the surface of the oil pipe sacrificial anode layer to remove impurities and roughen the surface, then placing the oil pipe in a 300-700 g / L sodium tungstate solution, heating to 250-300 ℃, pressurizing to 10-30 MPa, and maintaining for 15-20 h to form a tungsten-plated and infiltrated oil pipe; S5, cleaning and drying the tungsten-plated and infiltrated oil pipe.

7. A WDPF as defined by claim 6 wherein, Before the pickling of the surface of the oil pipe sacrificial anode layer in step S4, a carbon source solution is coated on the surface of the sacrificial anode layer, the surface is rinsed and dried after pickling, and then tungsten plating and infiltration are performed.

8. A WDPF as defined in claim 7, wherein The carbon source solution is a saturated glucose solution.

9. A WDPF as defined in claim 7, wherein The carbon source solution further comprises cobalt nano-particles, the particle size of the cobalt nano-particles is 1-50 nm, and the mass ratio of the cobalt nano-particles to the carbon source is 1: (3-5).

10. A WDPF as defined in claim 6, wherein After pickling, magnetization is performed, and the pickling in step S4 includes two times, the first pickling uses 50% sulfuric acid for 0.1-5 h, and the second pickling uses 95% sulfuric acid for 0.1-2 h.

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