Corrosion-resistant diamond composite wear-resistant belt for deep well drill rod joint and preparation method
A wear-resistant band was prepared by combining a diamond-reinforced phase with a corrosion-resistant metal binder phase, which solved the problem of early failure of drill pipe joints in corrosive environments and achieved a combination of high wear resistance and corrosion resistance. It is suitable for harsh environments such as sulfur-containing oil and gas fields and offshore drilling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-23
- Publication Date
- 2026-04-10
AI Technical Summary
Existing drill pipe joints suffer from early failure due to abrasive wear and electrochemical corrosion in sulfur-containing oil and gas fields, offshore drilling, and geothermal drilling. Conventional wear-resistant belts are insufficient in terms of wear resistance and corrosion resistance, and cannot meet the dual demanding requirements at the same time.
A wear-resistant band with a dense structure is formed by combining a diamond-reinforced phase with a corrosion-resistant metal binder phase of nickel-based superalloys, cobalt-based superalloys, or super austenitic stainless steel. The bonding strength and density are improved by isostatic pressing treatment, which blocks the penetration of corrosive media.
It improves the wear resistance and corrosion resistance of drill pipe joints, extends service life, and reduces replacement frequency. It is especially suitable for oil and gas well drilling operations with high content of corrosive media such as hydrogen sulfide and carbon dioxide.
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Abstract
Description
Technical Field
[0001] This application relates to the field of oil drilling equipment protection technology, and more specifically, it relates to a corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints and its preparation method. Background Technology
[0002] In sulfur-containing oil and gas fields, offshore drilling and geothermal drilling, drill pipe joints not only suffer from severe abrasive wear, but also from severe electrochemical corrosion and sulfide stress corrosion cracking (SSCC). Conventional tungsten carbide wear-resistant strips show obvious limitations in such environments: (1) the metal bonding phase (usually Co, Ni, Fe-based) in the wear-resistant strip is not resistant to media corrosion; (2) during the preparation of the wear-resistant strip, defects such as pores and microcracks are inevitably generated. Corrosive media penetrate into the interior of the wear-resistant strip through these defects and reach the drill pipe matrix directly, causing local corrosion of the matrix or even hydrogen-induced cracking, which seriously threatens drilling safety.
[0003] Currently, although corrosion resistance can be improved by welding corrosion-resistant alloys onto the surface of wear-resistant belts or by laser surface alloying, these methods either have insufficient wear resistance or poor adhesion to the substrate, and cannot simultaneously meet the dual demanding requirements of "corrosion resistance" and "wear resistance".
[0004] Therefore, the development of a wear-resistant belt that combines ultra-hard wear resistance with inherent corrosion resistance is an urgent problem to be solved in this field. Summary of the Invention
[0005] To provide a corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints, the wear-resistant strip body has excellent corrosion resistance and can effectively block the penetration of corrosive media, while maintaining the extraordinary hardness and wear resistance of diamond, fundamentally solving the problem of early failure of drill pipe joints in corrosive environments, this application provides a corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints and a preparation method thereof.
[0006] In a first aspect, this application provides a corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints, employing the following technical solution: A corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints, the wear-resistant strip comprising a diamond reinforcing phase and a corrosion-resistant metal bonding phase, wherein the corrosion-resistant metal bonding phase is any one of nickel-based high-temperature alloy, cobalt-based high-temperature alloy or super austenitic stainless steel.
[0007] By adopting the above technical solutions, the wear-resistant belt uses hard diamond as the diamond reinforcement phase. Diamond is chemically stable and does not react with substances such as hydrogen sulfide and carbon dioxide, giving the wear-resistant belt high hardness and high wear resistance. The binder phase uses nickel-based superalloys, cobalt-based superalloys, or super austenitic stainless steel, giving the wear-resistant belt good corrosion resistance. Nickel-based superalloys have a high chromium content, which can form a dense oxide film that can resist the penetration of corrosive substances such as hydrogen sulfide and carbon dioxide, improving the corrosion resistance of the wear-resistant belt. Cobalt-based superalloys contain elements such as chromium and nickel, which can form a protective oxide layer. The oxide layer is dense and can effectively prevent the penetration of corrosive media. Super austenitic stainless steel uses high nickel and chromium content to form a stable oxide film that resists the erosion of corrosive substances such as hydrogen sulfide and carbon dioxide, ensuring the corrosion resistance of the wear-resistant belt. At the same time, nickel-based superalloys, cobalt-based superalloys, or super austenitic stainless steel themselves have high strength and hardness, which can further improve the wear resistance and super hardness of the wear-resistant belt.
[0008] Preferably, the volume fraction of diamond particles in the diamond reinforcing phase is 30-50%, and the volume fraction of the corrosion-resistant metal binder phase is 50-70%.
[0009] By adopting the above technical solution, when the volume fraction of diamond particles is 30-50% and the volume fraction of corrosion-resistant metal binder phase is 50-70%, a uniform "skeleton-matrix" structure can be formed. The high hardness of diamond particles gives the wear-resistant belt high wear resistance, the corrosion-resistant metal binder phase prevents diamond particles from falling off, and the toughness of the metal phase can buffer impact loads, further improving the wear resistance of the wear-resistant belt.
[0010] When diamond particles with a volume fraction of 30-50% and a corrosion-resistant metal binder phase with a volume fraction of 50-70% are combined, a dense structure can be formed, reducing internal porosity, lowering wear rate, and resisting the erosion of corrosive media. The extremely low surface energy of diamond particles can also prevent the penetration of liquid corrosive media.
[0011] Preferably, the average particle size of the corrosion-resistant metal binder phase is 15-53 μm, and the corrosion-resistant metal binder phase is dried at 100-200℃ for 2-4 hours before use.
[0012] By adopting the above technical solution, the metal binder phase with an average particle size of 15-53μm will form a denser packing structure after drying (100-200℃), reducing porosity and making it difficult for corrosive media (such as acid, alkali, and salt solutions) to penetrate into the interior through physical penetration. Combined with diamond particles as a high-hardness skeleton, it forms a composite structure that combines rigidity and flexibility with the metal binder phase, further reducing microcracks and defects, blocking the penetration channels of corrosive media, and thus improving the corrosion resistance of the wear-resistant belt; it can also improve the wear resistance and strength of the wear-resistant belt.
[0013] The corrosion-resistant metal binder phase itself has the ability to form a passivation film. After drying, a dense oxide layer will form on the surface in a corrosive environment, which slows down the corrosion of the wear-resistant belt. Meanwhile, the diamond particles do not react with corrosive substances and can act as a barrier to prevent corrosive substances from directly contacting the metal binder phase, further preventing the penetration of corrosive media. At the same time, the strong interfacial bonding force between the metal binder phase and the diamond particles, combined with the high thermal conductivity of diamond, can quickly disperse the heat of corrosion reaction, reduce the local corrosion rate, and further improve the corrosion resistance of the wear-resistant belt.
[0014] Preferably, the average particle size of the diamond particles in the diamond reinforcing phase is 20-60 μm.
[0015] By adopting the above technical solution, the Mohs hardness of diamond can reach 10. When the wear-resistant belt is subjected to friction, the 20-60μm diamond particles, like a whetstone, directly resist wear through the micro-cutting effect. Furthermore, the rough micro-protrusion interface can increase the interfacial contact area with the corrosion-resistant metal bonding phase, thereby improving the interfacial bonding force and ensuring the wear resistance and strength of the wear-resistant belt. At the same time, the micro-protrusion structure of the diamond particles can effectively disperse stress, reduce matrix damage to the wear-resistant belt, and extend the service life of the wear-resistant belt while ensuring its wear resistance and ultra-high hardness.
[0016] Diamond particles are chemically inert and can effectively block the penetration and erosion of media such as water, acid, alkali, and carbon dioxide. In the wear-resistant belt, diamond particles are evenly distributed and partially exposed, increasing the contact area with external corrosive media. This effectively and comprehensively blocks corrosive media, forming a dense physical barrier. At the same time, the corrosion-resistant metal binder phase also has good corrosion resistance, further preventing the penetration and migration of corrosive media, thereby further improving the corrosion resistance of the wear-resistant belt.
[0017] Preferably, the nickel-based superalloy is Inconel 625 or Hastelloy C276, the cobalt-based superalloy is Stellite 6, and the super austenitic stainless steel is 254SMO.
[0018] By adopting the above technical solutions, the nickel-based superalloys are Inconel 625 or Hastelloy C276. Inconel 625 is strengthened by solid solution of molybdenum and niobium, as well as precipitation strengthening of the γ" phase (Ni3Nb), which enables it to maintain good creep resistance and deformation resistance at high temperatures, making it suitable for high-temperature wear environments. Hastelloy C276, with its high molybdenum content (15-17%) and dense oxide film (Cr2O3), can resist pitting and crevice corrosion, and performs excellently in corrosive wear environments containing chlorine or sulfides. The high hardness of the cobalt-based superalloy Stellite 6 mainly comes from hard carbides (such as Cr9C3) formed by chromium, tungsten and carbon. These hard phases can effectively resist the cutting and ploughing action of abrasive grains during wear, while the cobalt matrix provides toughness and avoids brittle fracture, thus giving the wear-resistant band good wear resistance.
[0019] Inconel 625, chromium and molybdenum work synergistically to form a stable oxide film that resists chloride stress corrosion cracking, making it suitable for seawater and chemical environments. Hastelloy C276, with its high nickel and molybdenum content, performs well in both reducing and oxidizing environments, especially resistant to chloride and sulfide corrosion. Stellite 6, with its chromium content (26-32%), forms a dense oxide film that effectively blocks oxidizing media and high-temperature oxidizing environments, thus giving the wear-resistant belt a better barrier against corrosive media penetration and improving its corrosion resistance.
[0020] Stellite 6, through its carbon content (0.9-1.4%), forms high-hardness carbides with chromium and tungsten, significantly improving hardness and resistance to deformation; Inconel 625 achieves high hardness and high-temperature strength through solid solution strengthening of molybdenum and niobium, as well as γ-phase precipitation strengthening; Hastelloy C276 provides high hardness and corrosion resistance by forming a dense oxide film through high molybdenum and chromium content.
[0021] Super austenitic stainless steel 254SMO features a dense Cr2O3 passivation film formed on its surface by chromium (19.5%-20.5%), effectively blocking the intrusion of corrosive media (such as chloride ions). 254SMO exhibits significantly higher room temperature tensile strength and yield strength than ordinary austenitic stainless steel, while maintaining high ductility. It can withstand friction and impact, and is less prone to failure under cyclic loading, making it suitable for high-wear environments. Combined with diamond particles, which provide high hardness, the binder phase of 254SMO firmly bonds the diamond particles through high strength and toughness, forming a uniform wear-resistant structure, reducing particle shedding, and improving the wear resistance, hardness, and corrosion resistance of the finished wear-resistant strip. Secondly, this application provides a method for preparing a corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints, using the following technical solution: A method for preparing a corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints includes the following steps: A wear-resistant layer is formed by fusing a diamond-reinforcing phase and a corrosion-resistant metal binder phase onto the surface of the drill pipe joint. After isostatic pressing, the wear-resistant layer of the diamond-reinforcing phase and the corrosion-resistant metal binder phase forms a wear-resistant band on the surface of the drill pipe joint.
[0022] By adopting the above technical solution, the diamond reinforcing phase and the corrosion-resistant metal binder phase are melt-treated and coated on the surface of the substrate such as the drill pipe joint. The corrosion-resistant metal binder phase acts like glue to firmly adhere the diamond reinforcing phase to the surface of the drill pipe structure, preventing the wear-resistant layer from falling off. Combined with isostatic pressing, the structural density of the wear-resistant layer is further improved. The internal micro-gaps between the wear-resistant layers that were originally bonded are filled by pressure treatment, forming a wear-resistant band with high structural density. This further improves the wear resistance and corrosion resistance of the wear-resistant band, and extends the service life of the wear-resistant band.
[0023] Preferably, the average thickness of the wear-resistant layer is 0.35-0.4 mm.
[0024] By adopting the above technical solution and limiting the thickness of the wear-resistant layer, a diamond alloy composite wear-resistant belt with extremely high density, low crack sensitivity, and strong bonding force is formed.
[0025] Preferably, the surface of the drill pipe joint is pretreated, and the pretreatment steps are as follows: degreasing, rust removal and sandblasting roughening treatment, with a roughness Ra of 15-30μm.
[0026] By adopting the above technical solution, the surface cleanliness of the drill pipe joint can be improved after degreasing and rust removal. Combined with subsequent sandblasting treatment, the roughness is controlled at 15-30μm, forming a large number of micro-pits and protrusions on the surface of the drill pipe joint. This provides a large specific surface area for the adhesion of the diamond reinforcement phase and the corrosion-resistant metal binder phase, increasing the interfacial bonding force between the diamond reinforcement phase and the corrosion-resistant metal binder phase and the drill pipe joint, thereby improving the bonding effect of the wear-resistant band. Furthermore, the surface of the sandblasted drill pipe joint can form a size-corresponding bond with the protrusions between the diamond particles in the diamond reinforcement phase, thereby further improving the structural density of the wear-resistant band. By forming a physical barrier of film, the penetration of corrosive media is blocked, further reducing the risk of interfacial corrosion.
[0027] Preferably, the specific steps of the isostatic pressing treatment are as follows: under argon conditions, at a temperature of 1000-1150℃ and a pressure of 100-150MPa, the pressure is maintained for 2-4 hours.
[0028] By adopting the above technical solution, under the high temperature and high pressure conditions of 1000-1150℃ and 100-150MPa, the pores and microcracks inside the wear-resistant belt can be eliminated through plastic deformation and diffusion healing. That is, high temperature promotes the precipitation and densification of the strengthening phase, high pressure can eliminate internal structural defects and microcracks, and the holding time can ensure that the wear-resistant belt is almost completely dense, thereby improving the density of the microstructure and giving the wear-resistant belt high wear resistance and good resistance to the permeability of corrosive media.
[0029] In summary, this application has the following beneficial effects: 1. The wear-resistant belt uses hard diamond particles as the diamond reinforcement phase. The diamond particles are chemically stable and do not react with substances such as hydrogen sulfide and carbon dioxide, giving the wear-resistant belt high hardness and high wear resistance. The binder phase uses nickel-based high-temperature alloys, cobalt-based high-temperature alloys, or super austenitic stainless steel, forming a dense structure and giving the wear-resistant belt good corrosion resistance, which can prevent the penetration of corrosive media, thereby improving the corrosion resistance of the wear-resistant belt.
[0030] 2. Isostatic pressing treatment allows the pores and microcracks inside the wear-resistant belt to be eliminated through plastic deformation and diffusion healing. That is, high temperature promotes the precipitation and densification of the strengthening phase, high pressure can eliminate internal structural defects and microcracks, and the holding time can ensure that the wear-resistant belt is almost completely dense, thereby improving the density of the microstructure and giving the wear-resistant belt high wear resistance and good resistance to the permeability of corrosive media.
[0031] 3. The wear-resistant strip is directly fused onto the surface of the drill pipe joint to form an integrated protection of active corrosion protection (corrosion-resistant bonding phase + passive barrier (dense structure)) to avoid sulfide stress corrosion cracking and hydrogen-induced cracking of the matrix.
[0032] 4. In corrosive environments, the annual wear-resistant belt prepared in this application has a comprehensive service life far exceeding that of conventional commercially available wear-resistant belts, reducing the number of times drill pipes need to be replaced; it is particularly suitable for protecting drill pipe joints in oil and gas well drilling operations with high contents of hydrogen sulfide, titanium dioxide and chloride ions.
[0033] 5. The wear-resistant belt combines the superior wear resistance of diamond with the excellent corrosion resistance of high-performance alloys, and can effectively block the penetration of corrosive media. It is especially suitable for oil and gas well drilling operations with high content of corrosive media such as hydrogen sulfide and carbon dioxide, and can significantly extend the service life of drill pipe joints and improve drilling safety. Detailed Implementation
[0034] The present application will be further described in detail below with reference to the embodiments and accompanying drawings. Attached Figure Description
[0035] Figure 1This is a graph showing the change in the friction coefficient of the corrosion-resistant diamond composite wear-resistant coating prepared in Example 1 of this application under specific working conditions. Figure 2 The graph shows the variation of the friction coefficient of a traditional rotor material under the example operating conditions. Figure 3 The image shows the surface wear marks of the corrosion-resistant diamond composite wear-resistant coating prepared in Example 1 of this application after friction and wear under specific working conditions. Example
[0036] Example 1: A corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints: It consists of a diamond reinforcing phase with a volume fraction of 40% and a corrosion-resistant metal binder phase with a volume fraction of 60%. The diamond reinforcing phase consists of diamond particles with an average particle size of 40 μm, and the corrosion-resistant metal binder phase consists of a nickel-based superalloy with an average particle size of 35 μm. The nickel-based superalloy is Inconel 625. The preparation method is as follows: Nickel-based superalloys were dried at 150°C for 3 hours before use; diamond particles were dried at 100°C for 2 hours before use. The surface of the drill pipe joint is sequentially degreased, derusted, and sandblasted to roughen it, with a roughness Ra of 25μm. This pretreatment is then completed and the joint is ready for use. A wear-resistant layer was formed by fusing a diamond-reinforcing phase and a corrosion-resistant metal binder phase onto the surface of the drill pipe joint (kerosene flow rate 18 L / h, oxygen flow rate 40 m³ / h, nitrogen powder feeding 5 m³ / h, powder feeding rate 52 g / min). The average thickness of the wear-resistant layer was 0.38 mm. After isostatic pressing, under argon conditions, at a temperature of 1100℃ and a pressure of 130 MPa, the wear-resistant layer formed by the diamond-reinforcing phase and the corrosion-resistant metal binder phase formed a wear-resistant band on the surface of the drill pipe joint.
[0037] Example 2: The difference between this example and Example 1 is that: It consists of a diamond reinforcing phase with a volume fraction of 30% and a corrosion-resistant metal binder phase with a volume fraction of 70%. The diamond reinforcing phase consists of diamond particles with an average particle size of 20 μm, and the corrosion-resistant metal binder phase consists of a nickel-based superalloy with an average particle size of 15 μm. The nickel-based superalloy is Hastelloy C276. The preparation method is as follows: Nickel-based superalloys were dried at 100℃ for 4 hours before use; diamond particles were dried at 100℃ for 2 hours before use. The surface of the drill pipe joint is sequentially subjected to degreasing, rust removal and sandblasting roughening treatment, with a roughness Ra of 15μm, to complete the pretreatment and set it aside; A wear-resistant layer was formed by fusing a diamond-reinforcing phase and a corrosion-resistant metal binder phase onto the surface of the drill pipe joint (kerosene flow rate 17 L / h, oxygen flow rate 38 m³ / h, nitrogen powder feeding 4 m³ / h, powder feeding rate 50 g / min). The average thickness of the wear-resistant layer was 0.35 mm. After isostatic pressing, under argon conditions, at a temperature of 1000℃ and a pressure of 150 MPa, the wear-resistant layer formed by the diamond-reinforcing phase and the corrosion-resistant metal binder phase formed a wear-resistant band on the surface of the drill pipe joint.
[0038] Example 3: The difference between this example and Example 1 is that: It consists of a diamond reinforcing phase with a volume fraction of 50% and a corrosion-resistant metal binder phase with a volume fraction of 50%. The diamond reinforcing phase consists of diamond particles with an average particle size of 60 μm, and the corrosion-resistant metal binder phase consists of a cobalt-based superalloy with an average particle size of 53 μm. The cobalt-based superalloy is Stellite6. The preparation method is as follows: Nickel-based superalloys were dried at 200℃ for 2 hours before use; diamond particles were dried at 100℃ for 2 hours before use. The surface of the drill pipe joint is sequentially subjected to degreasing, rust removal and sandblasting roughening treatment, with a roughness Ra of 30μm, to complete the pretreatment and set it aside; A wear-resistant layer was formed by fusing a diamond-reinforcing phase and a corrosion-resistant metal binder phase onto the surface of the drill pipe joint (kerosene flow rate 19 L / h, oxygen flow rate 42 m³ / h, nitrogen powder feeding 6 m³ / h, powder feeding rate 55 g / min). The average thickness of the wear-resistant layer was 0.4 mm. After isostatic pressing, under argon conditions, at a temperature of 1150℃ and a pressure of 100 MPa, the wear-resistant layer formed by the diamond-reinforcing phase and the corrosion-resistant metal binder phase formed a wear-resistant band on the surface of the drill pipe joint.
[0039] Example 4: The difference between this example and Example 1 is that: It consists of a diamond reinforcing phase with a volume fraction of 50% and a corrosion-resistant metal binder phase with a volume fraction of 50%. The diamond reinforcing phase consists of diamond particles with an average particle size of 60 μm, and the corrosion-resistant metal binder phase consists of super austenitic stainless steel 254SMO with an average particle size of 35 μm.
[0040] Performance testing 1. Abrasion resistance test Wear-resistant belts were prepared using the methods described in Examples 1-3. Commercially available rotor matrix materials (38CrMoAl, manufactured by Jinan Outuo Test Equipment Co., Ltd.) were purchased. The friction coefficient and wear amount in the impact sliding wear test were tested and the data were recorded. Specifically, the wear-resistant belt sample was immersed in drilling fluid for friction and wear tests, and the friction coefficient and wear amount were extracted after the test; the impact sliding wear test conditions were: impact load 200N, rotation speed 75r / min, abrasive particles of 100μm SiO2, and test time 1800s. The drilling fluid formulation is as follows: 4% bentonite-based slurry; 0.5% Redul, a filtration loss reducer carboxyhydroxyalkane copolymer; 0.5% HT-301, a zwitterionic polymer, a filtration loss reducer; 1% potassium chloride (KCL); 3% SMP-I (sulfonated phenolic resin type I); and the remainder is water to make up to 100%. Mix and stir evenly to obtain the drilling fluid.
[0041] 2. Density detection Wear-resistant belts were prepared using the methods described in Examples 1-3, and their relative density was tested and the data recorded.
[0042] 3. Hardness testing Wear-resistant belts were prepared using the methods described in Examples 1-3, and their hardness was tested and the data recorded.
[0043] Table 1 Performance Test Table
[0044] Combining Examples 1-3 and the rotor matrix material with Table 1, Figure 1 , 2 As can be seen from points 1 and 3, the wear-resistant belt prepared in this application has high wear resistance and high structural density, which can prevent the penetration of corrosive media, and at the same time has ultra-high hardness.
[0045] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints, characterized in that, The wear-resistant band comprises a diamond-reinforced phase and a corrosion-resistant metal bonding phase, wherein the corrosion-resistant metal bonding phase is any one of nickel-based high-temperature alloy, cobalt-based high-temperature alloy, or super austenitic stainless steel.
2. The corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints according to claim 1, characterized in that: The diamond-reinforcing phase has a diamond particle volume fraction of 30-50%, and the corrosion-resistant metal binder phase has a volume fraction of 50-70%.
3. The corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints according to claim 1, characterized in that, The corrosion-resistant metal binder phase has an average particle size of 15-53 μm and is dried at 100-200℃ for 2-4 hours before use.
4. The corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints according to claim 1, characterized in that, The average particle size of the diamond particles in the diamond-reinforced phase is 20-60 μm.
5. The corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints according to claim 1, characterized in that, The nickel-based superalloy is Inconel 625 or Hastelloy C276, the cobalt-based superalloy is Stellite 6, and the super austenitic stainless steel is 254SMO.
6. A method for preparing a corrosion-resistant diamond composite wear-resistant strip for deep well drill pipe joints according to any one of claims 1-5, characterized in that, Includes the following steps: A wear-resistant layer is formed by fusing a diamond-reinforcing phase and a corrosion-resistant metal binder phase onto the surface of the drill pipe joint. After isostatic pressing, the wear-resistant layer of the diamond-reinforcing phase and the corrosion-resistant metal binder phase forms a wear-resistant band on the surface of the drill pipe joint.
7. The method for preparing a corrosion-resistant diamond composite wear-resistant strip for a deep well drill pipe joint according to claim 6, characterized in that, The wear-resistant layer has an average thickness of 0.35-0.4 mm.
8. The method for preparing a corrosion-resistant diamond composite wear-resistant strip for a deep well drill pipe joint according to claim 6, characterized in that, The surface of the drill pipe joint is pretreated by the following steps: degreasing, rust removal and sandblasting roughening, with a roughness Ra of 15-30μm.
9. The method for preparing a corrosion-resistant diamond composite wear-resistant strip for a deep well drill pipe joint according to claim 6, characterized in that, The specific steps of the isostatic pressing treatment are as follows: under argon conditions, at a temperature of 1000-1150℃ and a pressure of 100-150MPa, the pressure is maintained for 2-4 hours.