Design method of corrosion-resistant and wear-resistant reinforced sucker rod

Abstract

The invention discloses a design method of an anti-corrosion and wear-resistant reinforced sucker rod, and relates to the technical field of oil exploitation equipment. According to the method, chemical components of the sucker rod are optimized, alloy elements such as chromium, nickel and molybdenum and microalloy elements such as niobium, titanium and vanadium are added, meanwhile, the surface treatment processes of boriding, nickel-phosphorus alloy plating and polyurethane elastomer coating are adopted, all links of the manufacturing process are optimized, and the manufacturing process is optimized. The corrosion resistance, the wear resistance and the comprehensive mechanical property of the sucker rod are obviously improved. Tests prove that the sucker rod adopting the design method can effectively deal with a complex and severe underground environment, the service life is prolonged, the oil extraction operation cost of an oil field is reduced, and the sucker rod has a wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of oil extraction equipment technology, and in particular relates to a design method for corrosion-resistant and wear-resistant reinforced sucker rods. Background Technology

[0002] The sucker rod is a key component in a rod pump lifting system that connects the surface pumping unit and the downhole pump, and its performance directly affects the oilfield's production efficiency and cost. As oilfield development enters the mid-to-late stages, the downhole environment becomes increasingly complex. The well fluid contains corrosive media such as brine, CO2, H2S, Cl-, and sulfate-reducing bacteria, as well as hard suspended solid particles, leading to severe corrosion and wear problems for the sucker rod.

[0003] Currently, the main methods for solving the corrosion problem of sucker rods in China are to form a hardened anti-corrosion layer on the surface using methods such as electroplating, chemical plating, or spray welding. However, these methods have the drawback of the hardened layer easily peeling off, and the peeled-off areas will accelerate corrosion, seriously affecting the service life of the sucker rod. In terms of wear resistance, traditional sucker rods also perform poorly. Although ceramic coatings can improve corrosion resistance and wear resistance, their high hardness easily causes severe wear on the sucker tubing, and their brittleness makes them prone to breakage under impact. High-polymer sealed anti-corrosion and wear-resistant sucker rods, which use epoxy resin as the main material, are also prone to peeling off, affecting the quality of use. Therefore, developing a sucker rod design method that can effectively improve corrosion resistance and wear resistance is of great significance. Summary of the Invention

[0004] To overcome the shortcomings of insufficient corrosion resistance and wear resistance in existing technologies for sucker rods, the present invention aims to provide a design method for corrosion-resistant and wear-resistant enhanced sucker rods. Sucker rods designed using this method can effectively cope with complex and harsh downhole environments, extend service life, reduce oilfield production costs, and have broad application prospects.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This invention discloses a design method for corrosion-resistant and wear-resistant reinforced sucker rods, comprising:

[0007] Surface treatment processes: ① Boronizing treatment: Grind the surface of the forged sucker rod to a roughness Ra of 0.2μm-0.8μm, immerse it in a boronizing agent containing 5% boron carbide, 5% potassium fluoroborate, and 90% silicon carbide, and keep it at 800-900℃ for 4-6 hours. After cooling, grind to remove surface impurities to form a boronized layer of 0.05mm-0.12mm; ② Nickel-phosphorus alloy plating treatment: Perform chemical plating on the surface of the boronized sucker rod. The plating solution contains a nickel ion concentration of 20-30g / L, a sodium hypophosphite concentration of 25-35g / L, and a pH value of 4.5-5.5. Plating is carried out at 85-95℃ for 1-3 hours to form a plating layer of 0.02mm-0.05mm; ③ Coating with polyurethane elastomer: After surface treatment of the sucker rod after nickel-phosphorus alloy plating, apply coupling adhesive and bonding interface agent, coat with a 0.5mm-6mm thick polyurethane elastomer and cure.

[0008] Manufacturing process optimization includes cold drawing, forging, quenching and tempering heat treatment, straightening, turning and thread rolling, polishing, and packaging. Cold drawing speed is 0.5-1.5 m / min, deformation is 10%-20%; forging temperature is 1000-1200℃, forging ratio is 3-5; quenching temperature during quenching and tempering heat treatment is 850-950℃, tempering temperature is 500-650℃; straightening results in a straightness of 1 mm / 1000 mm; polishing results in a surface roughness Ra of 0.2 μm-0.8 μm.

[0009] The sucker rod is selected to have the following chemical composition by mass percentage: C 0.3%-0.5%, Si 0.17%-0.37%, Mn 0.6%-0.9%, Cr 12%-15%, Ni 3%-5%, Mo 0.25%-0.5%, Nb 0.01%-0.05%, Ti 0.01%-0.05%, V 0.01%-0.05%, with the remainder being Fe and impurities.

[0010] Furthermore, the sucker rod comprises the following chemical composition by mass percentage: C 0.3%, Si 0.17%, Mn 0.6%, Cr 12%, Ni 3%, Mo 0.25%, Nb 0.01%, Ti 0.01%, V 0.01%, with the remainder being Fe and impurities.

[0011] Furthermore, the sucker rod comprises the following chemical composition by mass percentage: C 0.4%, Si 0.27%, Mn 0.75%, Cr 13.5%, Ni 4%, Mo 0.375%, Nb 0.03%, Ti 0.03%, V 0.03%, with the remainder being Fe and impurities.

[0012] Furthermore, the sucker rod comprises the following chemical composition by mass percentage: C 0.5%, Si 0.37%, Mn 0.9%, Cr 15%, Ni 5%, Mo 0.5%, Nb 0.05%, Ti 0.05%, V 0.05%, with the remainder being Fe and impurities.

[0013] Furthermore, specifically:

[0014] Surface treatment processes: ① Boronizing treatment: The sucker rod surface is ground to Ra0.2μm, immersed in a boronizing agent containing 5% boron carbide, 5% potassium fluoroborate, and 90% silicon carbide, kept at 800℃ for 4 hours, cooled, and then ground again, with a boronizing layer thickness of 0.05mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 20g / L nickel ions, 25g / L sodium hypophosphite, and pH 4.5. Plating is carried out at 85℃ for 1 hour, with a plating layer thickness of 0.02mm; ③ Coating with polyurethane elastomer: After surface treatment, a 5% silane coupling agent is applied, dried, followed by a polyurethane interface agent, and then dried again. A 0.5mm thick thermosetting polyurethane elastomer is then coated and cured at 100℃ for 2 hours.

[0015] Manufacturing process optimization: cold drawing speed 0.5m / min, deformation 10%; forging temperature 1000℃, forging ratio 3; quenching temperature 850℃, tempering temperature 500℃; straightness after straightening 1mm / 1000mm; turning cutting speed 100m / min, feed rate 0.1mm / r; thread rolling pressure 5MPa, speed 10r / min, 2 times; polishing with 80-mesh abrasive belt, speed 15m / s, feed rate 0.1mm / r; finally, apply anti-rust grease and pack in bags.

[0016] Furthermore, specifically:

[0017] Surface treatment processes: ① Boronizing treatment: The surface of the sucker rod is ground to Ra0.5μm, immersed in boronizing agent, kept at 850℃ for 5 hours, cooled and ground again, with a boronizing layer thickness of 0.085mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 25g / L nickel ions, 30g / L sodium hypophosphite, pH value 5.0, and is plated at 90℃ for 2 hours, with a plating layer thickness of 0.035mm; ③ Coating with polyurethane elastomer: After surface treatment, 5% titanate coupling agent is applied, dried, followed by polyurethane interface agent, and then dried again. A 3.25mm thick thermoplastic polyurethane elastomer is then wrapped, vacuum-wrapped using extruded viscous flow tubing, and then cooled.

[0018] Manufacturing process optimization: cold drawing speed 1.0 m / min, deformation 15%; forging temperature 1100℃, forging ratio 4; quenching temperature 900℃, tempering temperature 575℃; straightness after straightening 1 mm / 1000 mm; turning cutting speed 150 m / min, feed rate 0.2 mm / r; thread rolling pressure 7.5 MPa, speed 15 r / min, 2 times; polishing with 160 mesh abrasive belt, speed 22.5 m / s, feed rate 0.2 mm / r.

[0019] Furthermore, specifically:

[0020] Surface treatment processes: ① Boronizing treatment: The surface of the sucker rod is ground to Ra0.8μm, immersed in boronizing agent, kept at 900℃ for 6 hours, cooled and ground again, with a boronizing layer thickness of 0.12mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 30g / L nickel ions, 35g / L sodium hypophosphite, pH value 5.5, and is plated at 95℃ for 3 hours, with a plating layer thickness of 0.05mm; ③ Coating with polyurethane elastomer: After surface treatment, 5% silane coupling agent is applied, dried, followed by polyurethane interface agent, dried again, and then coated with 6mm thick thermosetting polyurethane elastomer, which is heated and cured at 120℃ for 6 hours;

[0021] (3) Manufacturing process optimization: cold drawing speed 1.5m / min, deformation amount 20%; forging temperature 1200℃, forging ratio 5; quenching temperature 950℃, tempering temperature 650℃; straightness after straightening 1mm / 1000mm; turning cutting speed 200m / min, feed rate 0.3mm / r; thread rolling pressure 10MPa, speed 20r / min, 3 times; polishing with 240 mesh abrasive belt, speed 30m / s, feed rate 0.3mm / r.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are as follows: Detailed Implementation

[0023] A design method for corrosion-resistant and wear-resistant enhanced sucker rods includes three aspects: chemical composition optimization, surface treatment process optimization, and manufacturing process optimization.

[0024] Chemical composition optimization:

[0025] Alloy steel containing 0.3%-0.5% carbon (C), 0.17%-0.37% silicon (Si), and 0.6%-0.9% manganese (Mn) is selected as the base material. Carbon can improve the strength and hardness of steel, silicon can enhance strength, hardness, oxidation resistance, and corrosion resistance, and manganese can improve strength, hardenability, and hot working performance. Adding 12%-15% chromium (Cr) can form a dense oxide film on the steel surface, effectively preventing the intrusion of corrosive media; adding 3%-5% nickel (Ni) can improve strength, toughness, and resistance to stress corrosion cracking; adding 0.25%-0.5% molybdenum (Mo) can enhance resistance to pitting and crevice corrosion in chloride-containing environments. Microalloying with 0.01%-0.05% niobium (Nb), 0.01%-0.05% titanium (Ti), and 0.01%-0.05% vanadium (V) refines the grains and improves the strength, toughness, and fatigue resistance of the steel.

[0026] Surface treatment process:

[0027] Boronizing treatment: This is performed after forging and before tempering heat treatment. First, the surface of the sucker rod is ground to a roughness Ra of 0.2μm-0.8μm using a belt grinder. Then, it is placed in a muffle can and filled with a boronizing agent composed of 5% boron carbide, 5% potassium fluoroborate, and 90% silicon carbide. The muffle can is placed in a pit furnace and heated to 800-900℃, held for 4-6 hours to allow boron atoms to fully diffuse into the surface and form a boronized layer. After cooling to room temperature, residual impurities are removed by grinding with a belt grinder, yielding a boronized layer with a thickness of 0.05mm-0.12mm. This boronized layer consists of Fe2B and FeB phases, with a hardness reaching HV1500-2000, exhibiting good wear resistance and a certain degree of corrosion resistance.

[0028] Nickel-phosphorus alloy plating: Chemical plating is performed on the surface of the sucker rod after boronizing treatment. The nickel ion concentration in the plating solution is controlled at 20-30 g / L, the sodium hypophosphite concentration at 25-35 g / L, the pH value adjusted to 4.5-5.5, the plating temperature maintained at 85-95℃, and the plating time 1-3 hours, forming a uniform and dense alloy coating with a thickness of 0.02 mm-0.05 mm. This coating has strong corrosion resistance, high hardness, and good self-lubricating properties, which can reduce the coefficient of friction and improve wear resistance.

[0029] Coating with polyurethane elastomer: The surface of the sucker rod after nickel-phosphorus alloy plating is treated to remove oil and rust, and then cleaned. Sandblasting is then performed to increase surface roughness and enhance coating adhesion. A 5% silane coupling agent or titanate coupling agent solution is evenly applied as a coupling binder, and after drying, a polyurethane interface agent is applied as an adhesive interface agent, and then dried again. Liquid thermosetting polyurethane elastomer is then coated onto the sucker rod surface using a polyurethane casting machine, controlling the thickness to 0.5mm-6mm, and then cured at 100-120℃ for 2-6 hours. If thermoplastic polyurethane elastomer is used, it is coated using an extruded viscous tubing method via vacuum, followed by cooling. Polyurethane elastomer exhibits excellent wear resistance, oil resistance, and flexibility, effectively buffering impact and friction, further improving wear resistance. It also bonds firmly to the coating, preventing the penetration of oil-water mixtures and enhancing corrosion resistance.

[0030] Manufacturing process optimization:

[0031] Cold drawing process: Select alloy steel bars that meet the chemical composition requirements, and cold draw them through a cold drawing machine at a speed of 0.5-1.5m / min and a deformation of 10%-20% to obtain round steel bars with precise diameter and smooth surface. This process makes the internal structure of the steel dense, improving its strength and surface quality.

[0032] Forging process: One end of the cold-drawn round steel is upset and forged at 1000-1200℃ with a forging ratio of 3-5. This process breaks up the casting structure, refines the grains, and forms a sucker rod shape that meets the requirements. After forging, the dimensions and shape are inspected.

[0033] Tempering heat treatment process: The sucker rod that has been boronized and surface impurities removed is treated. First, it is heated to 850-950℃, held for 30-60 minutes, and then cooled in quenching oil to obtain a martensitic structure; then it is heated to 500-650℃ and held for 1-2 hours for tempering to relieve stress and improve toughness. After treatment, the hardness and metallographic structure are tested.

[0034] Straightening process: A press is used to straighten the heat-treated sucker rod. The straightening is carried out step by step by controlling the pressure and stroke. A laser measuring instrument is used to monitor in real time to ensure that the straightness meets 1mm / 1000mm, which provides a good foundation for subsequent processing.

[0035] Thread turning and rolling process: The straightened sucker rod is turned at both ends using a CNC lathe at a cutting speed of 100-200 m / min and a feed rate of 0.1-0.3 mm / r. Then, the thread is rolled using a thread rolling machine at a rolling pressure of 5-10 MPa, a rolling speed of 10-20 r / min, and 2-3 rolling cycles. After machining, the thread accuracy, dimensional accuracy, and surface quality are inspected.

[0036] Polishing process: The surface of the sucker rod after thread rolling is ground using a belt grinder with 80-240 grit abrasive belt, grinding speed of 15-30 m / s, and feed rate of 0.1-0.3 mm / r, so that the surface roughness Ra reaches 0.2 μm-0.8 μm, which meets the wellhead sealing requirements, reduces friction, and improves sealing and corrosion resistance.

[0037] Packaging process: Apply anti-rust grease to the polished surface of the finished oil extraction rod, seal it in a plastic bag, and then pack it to prevent rust during storage and transportation.

[0038] The present invention will be further described in detail below with reference to specific embodiments.

[0039] Example 1: Applicable to low-salinity oil fields

[0040] A design method for corrosion-resistant and wear-resistant reinforced sucker rods, comprising the following steps:

[0041] (1) Chemical composition optimization: Select alloy steel containing 0.3% carbon, 0.17% silicon and 0.6% manganese, add 12% chromium, 3% nickel and 0.25% molybdenum, and add 0.01% niobium, 0.01% titanium and 0.01% vanadium.

[0042] (2) Surface treatment process: ① Boronizing treatment: The surface of the sucker rod is ground to Ra0.2μm, immersed in a boronizing agent containing 5% boron carbide, 5% potassium fluoroborate and 90% silicon carbide, kept at 800℃ for 4 hours, cooled and ground, the thickness of the boronized layer is 0.05mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 20g / L nickel ions, 25g / L sodium hypophosphite, pH value 4.5, and is plated at 85℃ for 1 hour, the thickness of the plating layer is 0.02mm; ③ Coating with polyurethane elastomer: After surface treatment, 5% silane coupling agent is brushed on, dried and then polyurethane interface agent is applied, dried again, and then coated with 0.5mm thick thermosetting polyurethane elastomer, heated at 100℃ for 2 hours.

[0043] (3) Manufacturing process optimization: cold drawing speed 0.5m / min, deformation amount 10%; forging temperature 1000℃, forging ratio 3; quenching temperature 850℃, tempering temperature 500℃; straightness after straightening 1mm / 1000mm; turning cutting speed 100m / min, feed rate 0.1mm / r; thread rolling pressure 5MPa, speed 10r / min, number of times 2; polishing with 80 mesh sandpaper, speed 15m / s, feed rate 0.1mm / r; finally, apply anti-rust grease and pack in bags.

[0044] Its relevant mechanical properties are as follows: tensile strength (Rm): 1160MPa, yield strength (Rel): 951MPa, elongation after fracture (A): 21%, reduction of area (Z): 47%, impact energy (KV2, -20℃): ≥45J, Brinell hardness (HBW): 316.

[0045] A trial was conducted in a low-salinity oilfield. While the well fluid in this oilfield had low salinity and relatively few corrosive media, some wear from suspended solid particles still occurred. After six months of using the sucker rod designed in this embodiment, inspection revealed only slight wear on the surface, with no significant corrosion. Compared to traditional sucker rods, its service life is expected to be more than doubled.

[0046] Example 2: Applicable to oil fields with medium to high salinity and containing H2S.

[0047] A design method for corrosion-resistant and wear-resistant reinforced sucker rods, comprising the following steps:

[0048] (1) Chemical composition optimization: Select alloy steel containing 0.4% carbon, 0.27% silicon and 0.75% manganese, and add 13.5% chromium, 4% nickel and 0.375% molybdenum, 0.03% niobium, 0.03% titanium and 0.03% vanadium.

[0049] (2) Surface treatment process: ① Boronizing treatment: The surface of the sucker rod is ground to Ra0.5μm, placed in boronizing agent, kept at 850℃ for 5 hours, cooled and ground, the thickness of the boronized layer is 0.085mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 25g / L nickel ions, 30g / L sodium hypophosphite, pH value 5.0, and is plated at 90℃ for 2 hours, the thickness of the plating layer is 0.035mm; ③ Coating with polyurethane elastomer: After surface treatment, 5% titanate coupling agent is brushed on, dried and then polyurethane interface agent is applied, dried again, and then 3.25mm thick thermoplastic polyurethane elastomer is wrapped, vacuum-wrapped by extruding viscous flow pipe and then cooled.

[0050] (3) Manufacturing process optimization: cold drawing speed 1.0m / min, deformation amount 15%; forging temperature 1100℃, forging ratio 4; quenching temperature 900℃, tempering temperature 575℃; straightness after straightening 1mm / 1000mm; turning cutting speed 150m / min, feed rate 0.2mm / r; thread rolling pressure 7.5MPa, speed 15r / min, number of times 2; polishing with 160 mesh abrasive belt, speed 22.5m / s, feed rate 0.2mm / r; final packaging.

[0051] Its relevant mechanical properties are as follows: tensile strength (Rm): 1399MPa, yield strength (Rel): 1280MPa, elongation after fracture (A): 19%, reduction of area (Z): 49%, impact energy (KV2, -20℃): ≥51J, Brinell hardness (HBW): 355.

[0052] In a trial conducted in a medium-to-high salinity oilfield containing H2S, the well fluid in this oilfield had a high H2S concentration, which was highly corrosive to the sucker rod and also contained a large number of solid particles. After 8 months of use, the sucker rod of this embodiment showed only slight surface corrosion and minimal wear, and could still function normally. In contrast, the average service life of traditional sucker rods previously used in this oilfield was only about 4 months, indicating a significant extension in the service life of the sucker rod of this embodiment.

[0053] Example 3: Applicable to high sand-bearing oilfields

[0054] A design method for corrosion-resistant and wear-resistant reinforced sucker rods, comprising the following steps:

[0055] (1) Chemical composition optimization: Select alloy steel containing 0.5% carbon, 0.37% silicon and 0.9% manganese, add 15% chromium, 5% nickel and 0.5% molybdenum, and add 0.05% niobium, 0.05% titanium and 0.05% vanadium.

[0056] (2) Surface treatment process: ① Boronizing treatment: Grind the surface of the sucker rod to Ra0.8μm, put it into the boronizing agent, keep it at 900℃ for 6 hours, cool it and grind it, the thickness of the boronizing layer is 0.12mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 30g / L nickel ions, 35g / L sodium hypophosphite, pH value 5.5, and is plated at 95℃ for 3 hours, the plating layer thickness is 0.05mm; ③ Coating with polyurethane elastomer: After surface treatment, brush with 5% silane coupling agent, dry it and then apply polyurethane interface agent, dry it again, and coat it with 6mm thick thermosetting polyurethane elastomer, heat it at 120℃ for 6 hours to cure.

[0057] (3) Manufacturing process optimization: cold drawing speed 1.5m / min, deformation amount 20%; forging temperature 1200℃, forging ratio 5; quenching temperature 950℃, tempering temperature 650℃; straightness after straightening 1mm / 1000mm; turning cutting speed 200m / min, feed rate 0.3mm / r; thread rolling pressure 10MPa, speed 20r / min, 3 times; polishing with 240 mesh abrasive belt, speed 30m / s, feed rate 0.3mm / r; final packaging.

[0058] Its relevant mechanical properties are as follows: tensile strength (Rm): 1660MPa, yield strength (Rel): 1498MPa, elongation after fracture (A): 12%, reduction of area (Z): 38%, impact energy (KV2, -20℃): ≥42J, Brinell hardness (HBW): 400.

[0059] In a trial run at a high-sand-content oilfield, where the well fluid contained a high content of solid sand particles, the sucker rods experienced severe wear. After 10 months of use, the sucker rods of this embodiment showed significantly less surface wear than traditional sucker rods, and no obvious corrosion was observed.

[0060] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A design method for corrosion-resistant and wear-resistant reinforced sucker rods, characterized in that, include: Surface treatment processes: ① Boronizing treatment: Grind the surface of the forged sucker rod to a roughness Ra of 0.2μm-0.8μm, immerse it in a boronizing agent containing 5% boron carbide, 5% potassium fluoroborate, and 90% silicon carbide, and keep it at 800-900℃ for 4-6 hours. After cooling, grind to remove surface impurities to form a boronized layer of 0.05mm-0.12mm; ② Nickel-phosphorus alloy plating treatment: Perform chemical plating on the surface of the boronized sucker rod. The plating solution contains a nickel ion concentration of 20-30g / L, a sodium hypophosphite concentration of 25-35g / L, and a pH value of 4.5-5.

5. Plating is carried out at 85-95℃ for 1-3 hours to form a plating layer of 0.02mm-0.05mm; ③ Coating with polyurethane elastomer: After surface treatment of the sucker rod after nickel-phosphorus alloy plating, apply coupling adhesive and bonding interface agent, coat with a 0.5mm-6mm thick polyurethane elastomer and cure. Manufacturing process optimization includes cold drawing, forging, quenching and tempering heat treatment, straightening, turning and thread rolling, polishing, and packaging. Cold drawing speed is 0.5-1.5 m / min, deformation is 10%-20%; forging temperature is 1000-1200℃, forging ratio is 3-5; quenching temperature during quenching and tempering heat treatment is 850-950℃, tempering temperature is 500-650℃; straightening results in a straightness of 1 mm / 1000 mm; polishing results in a surface roughness Ra of 0.2 μm-0.8 μm. The sucker rod is selected to have the following chemical composition by mass percentage: C 0.3%-0.5%, Si 0.17%-0.37%, Mn 0.6%-0.9%, Cr 12%-15%, Ni 3%-5%, Mo 0.25%-0.5%, Nb 0.01%-0.05%, Ti 0.01%-0.05%, V 0.01%-0.05%, with the remainder being Fe and impurities.

2. The design method for corrosion-resistant and wear-resistant reinforced sucker rod according to claim 1, characterized in that, The sucker rod comprises the following chemical composition by mass percentage: C 0.3%, Si 0.17%, Mn 0.6%, Cr 12%, Ni 3%, Mo 0.25%, Nb 0.01%, Ti 0.01%, V 0.01%, with the remainder being Fe and impurities.

3. The design method for corrosion-resistant and wear-resistant reinforced sucker rod according to claim 1, characterized in that, The sucker rod comprises the following chemical composition by mass percentage: C 0.4%, Si 0.27%, Mn 0.75%, Cr 13.5%, Ni 4%, Mo 0.375%, Nb 0.03%, Ti 0.03%, V 0.03%, with the remainder being Fe and impurities.

4. The design method for corrosion-resistant and wear-resistant reinforced sucker rod according to claim 1, characterized in that, The sucker rod comprises the following chemical composition by mass percentage: C 0.5%, Si 0.37%, Mn 0.9%, Cr 15%, Ni 5%, Mo 0.5%, Nb 0.05%, Ti 0.05%, V 0.05%, with the remainder being Fe and impurities.

5. The design method for corrosion-resistant and wear-resistant reinforced sucker rod according to claim 2, characterized in that, Specifically: Surface treatment processes: ① Boronizing treatment: The sucker rod surface is ground to Ra0.2μm, immersed in a boronizing agent containing 5% boron carbide, 5% potassium fluoroborate, and 90% silicon carbide, kept at 800℃ for 4 hours, cooled, and then ground again, with a boronizing layer thickness of 0.05mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 20g / L nickel ions, 25g / L sodium hypophosphite, and pH 4.

5. Plating is carried out at 85℃ for 1 hour, with a plating layer thickness of 0.02mm; ③ Coating with polyurethane elastomer: After surface treatment, a 5% silane coupling agent is applied, dried, followed by a polyurethane interface agent, and then dried again. A 0.5mm thick thermosetting polyurethane elastomer is then coated and cured at 100℃ for 2 hours. Manufacturing process optimization: cold drawing speed 0.5m / min, deformation 10%; forging temperature 1000℃, forging ratio 3; quenching temperature 850℃, tempering temperature 500℃; straightness after straightening 1mm / 1000mm; turning cutting speed 100m / min, feed rate 0.1mm / r; thread rolling pressure 5MPa, speed 10r / min, 2 times; polishing with 80-mesh abrasive belt, speed 15m / s, feed rate 0.1mm / r; finally, apply anti-rust grease and pack in bags.

6. The design method for corrosion-resistant and wear-resistant reinforced sucker rod according to claim 3, characterized in that, Specifically: Surface treatment processes: ① Boronizing treatment: The surface of the sucker rod is ground to Ra0.5μm, immersed in boronizing agent, kept at 850℃ for 5 hours, cooled and ground again, with a boronizing layer thickness of 0.085mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 25g / L nickel ions, 30g / L sodium hypophosphite, pH value 5.0, and is plated at 90℃ for 2 hours, with a plating layer thickness of 0.035mm; ③ Coating with polyurethane elastomer: After surface treatment, 5% titanate coupling agent is applied, dried, followed by polyurethane interface agent, and then dried again. A 3.25mm thick thermoplastic polyurethane elastomer is then wrapped, vacuum-wrapped using extruded viscous flow tubing, and then cooled. Manufacturing process optimization: cold drawing speed 1.0 m / min, deformation 15%; forging temperature 1100℃, forging ratio 4; quenching temperature 900℃, tempering temperature 575℃; straightness after straightening 1 mm / 1000 mm; turning cutting speed 150 m / min, feed rate 0.2 mm / r; thread rolling pressure 7.5 MPa, speed 15 r / min, 2 times; polishing with 160 mesh abrasive belt, speed 22.5 m / s, feed rate 0.2 mm / r.

7. The design method for corrosion-resistant and wear-resistant reinforced sucker rod according to claim 4, characterized in that, Specifically: Surface treatment processes: ① Boronizing treatment: Grind the surface of the sucker rod to Ra0.8μm, immerse it in boronizing agent, keep it at 900℃ for 6 hours, cool it and grind it again, the boronizing layer thickness is 0.12mm; ② Nickel-phosphorus alloy plating treatment: The plating solution contains 30g / L nickel ions, 35g / L sodium hypophosphite, pH value 5.5, and is applied at 95℃ for 3 hours, the plating layer thickness is 0.05mm; ③ Coating with polyurethane elastomer: After surface treatment, brush on 5% silane coupling agent, let it dry, then apply polyurethane interface agent, let it dry again, and then coat it with 6mm thick thermosetting polyurethane elastomer, heat it at 120℃ for 6 hours to cure. (3) Manufacturing process optimization: cold drawing speed 1.5m / min, deformation amount 20%; forging temperature 1200℃, forging ratio 5; quenching temperature 950℃, tempering temperature 650℃; straightness after straightening 1mm / 1000mm; turning cutting speed 200m / min, feed rate 0.3mm / r; thread rolling pressure 10MPa, speed 20r / min, 3 times; polishing with 240 mesh abrasive belt, speed 30m / s, feed rate 0.3mm / r.