High-wear-resistance drill rod for deep nitrogen-oxygen composite treatment

Abstract

The utility model provides a high-wear-resistance drill rod for deep nitrogen-oxygen composite treatment, and belongs to the technical field of drill rods. Comprising a drill rod body, a plurality of threaded grooves are formed in the periphery of the drill rod body, and the threaded grooves comprise a plurality of clockwise threaded grooves and a plurality of anticlockwise threaded grooves. According to the utility model, a plurality of thread grooves are formed in the periphery of the drill rod main body, and comprise a plurality of clockwise thread grooves and anticlockwise thread grooves which are uniformly distributed, so that the aim of effectively discharging chips in the rotary drilling process of the drill rod is fulfilled; and the nitrogen-oxygen composite treatment layer, the priming coating, the wear-resistant middle coating and the surface lubricating coating are sequentially arranged and cooperatively matched, so that the purpose of improving the overall wear resistance of the drill rod is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drill pipe, especially to a high wear resistance drill pipe of deep nitrogen oxygen composite treatment. BACKGROUND

[0002] In the process of modern industrial development, drilling operation is widely used in oil exploitation, mineral exploration, geological research and construction of various building foundations and other fields, and is the key means to obtain underground resource information and implement underground engineering construction. With the continuous growth of resource demand in various industries and the expansion of exploration and mining areas to deeper strata and complex geological conditions, drilling technology is facing increasingly high requirements. As a core component of drilling equipment, the performance improvement of drill pipe has a crucial impact on the efficiency, cost and safety of the entire drilling operation.

[0003] However, in the drilling process, the drill cuttings generated by the existing drill bit cutting strata are difficult to smoothly discharge from the drill hole, resulting in a large accumulation of drill cuttings between the drill pipe and the hole wall. This not only greatly increases the friction resistance when the drill pipe rotates, greatly increases the power required for drilling, causing waste of energy, but also seriously affects the continuity and efficiency of the drilling operation, increasing the construction cost and time cost. At the same time, the traditional drill pipe has serious defects in stress uniformity, and the stress cannot be uniformly distributed during rotation, which causes the drill pipe to locally bear excessive pressure and friction during work, accelerating the wear and damage of the drill pipe, shortening the service life of the drill pipe, and frequent replacement of the drill pipe further increases the economic burden and time consumption of the drilling operation. In addition, the friction between the traditional drill pipe and the stratum is relatively single and the friction is large, which not only affects the drilling efficiency, but also the excessive heat generated by friction may have an adverse effect on the material properties of the drill pipe, reducing the reliability and stability of the drill pipe. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a high wear resistance drill pipe of deep nitrogen oxygen composite treatment to solve the technical problem that the traditional drill pipe is difficult to discharge cuttings during use, and the traditional drill pipe has poor wear resistance, and the surface is easily severely worn during a long time of friction with high-hardness rock and stratum, resulting in reduced service life of the drill pipe.

[0005] Technical scheme: To achieve the above purpose, the utility model is implemented by the following technical scheme: a high wear resistance drill pipe of deep nitrogen oxygen composite treatment, comprising: a drill pipe body, a plurality of thread grooves are formed on the periphery of the drill pipe body, the plurality of thread grooves include a plurality of clockwise thread grooves and a plurality of counterclockwise thread grooves, wherein the plurality of clockwise thread grooves and the plurality of counterclockwise thread grooves are evenly distributed on the periphery of the drill pipe.

[0006] In a further embodiment, a flow guide is provided in the center of the drill pipe and extends through both ends of the drill pipe, the flow guide being configured to direct drilling fluid to the drill bit, wherein the vertical centerline of the flow guide is aligned with the vertical centerline of the drill pipe.

[0007] In a further embodiment, a nitride-oxide composite treatment layer is provided on the outer surface of the drill pipe, the nitride-oxide composite treatment layer being configured to increase the hardness and wear resistance of the drill pipe surface, wherein the surface hardness of the treated drill pipe body is greater than or equal to 1000 HV0.3, the core hardness is 30-35 HRC, the effective hardening layer depth is greater than or equal to 0.5 mm, the hardness can reach 900-960 HV0.3 after grinding 0.05 mm, and the hardness can still reach 850 HV0.3 after grinding 0.1 mm.

[0008] In a further embodiment, a primer coating is sprayed on the periphery of the nitride-oxide composite treatment layer, the primer coating being configured to fill the gaps on the surface of the drill pipe after the nitride-oxide composite treatment, wherein the material selection of the primer coating should be carefully selected and optimized according to the characteristics of the nitride-oxide composite treatment layer and the requirements of the subsequent coating layer, to ensure that its chemical composition and physical properties can meet the cooperative work requirements of the entire coating system; the preparation process should follow strict quality control standards to ensure that the purity, particle size distribution and uniformity of the material meet the requirements.

[0009] In a further embodiment, a wear-resistant intermediate coating is provided on the periphery of the primer coating, the wear-resistant intermediate coating being configured to further enhance the wear resistance of the drill pipe, wherein the wear-resistant intermediate coating is made of high-performance tungsten carbide (WC) based composite material, wherein the grain size of WC is controlled within a specific range through special ball milling and grading treatment to improve its hardness and wear resistance, and an appropriate amount of binder metal (such as cobalt, nickel, etc.) is added, and the wear-resistant material is uniformly and densely sprayed on the primer coating through a unique thermal spraying process, such as high-velocity oxygen fuel spraying (HVOF) or atmospheric plasma spraying (APS) technology, combined with strict process parameter control, to form a protective layer with high hardness and high wear resistance, the WC based composite material of the wear-resistant intermediate coating should have high purity and uniform composition distribution, and the control of WC grain size should be realized through advanced powder treatment technology to ensure that it fluctuates within a certain range, to ensure the stability and consistency of the hardness and wear resistance of the coating.

[0010] In a further embodiment, a surface lubricating coating is arranged on the periphery of the surface lubricating coating for increasing the smoothness of the outer surface of the drill pipe, wherein the surface lubricating coating is made of a high polymer material with low friction coefficient and good high temperature resistance, such as polytetrafluoroethylene (PTFE) based composite material, which is modified by adding appropriate amount of lubricant (such as graphite, molybdenum disulfide, etc.) and antioxidant and other additives to further improve its lubricating performance and high temperature stability. A special coating process, such as electrostatic spraying or dipping coating, is used, combined with fine adjustment of coating parameters, such as coating time, temperature, solution concentration, etc., to form a uniform and smooth lubricating film on the surface of the wear-resistant intermediate coating; the high polymer material of the surface lubricating coating should have good chemical stability and thermal stability, and the types and contents of the additives should be reasonably selected and adjusted according to the service environment and performance requirements of the drill pipe to ensure that the lubricating performance is improved without affecting other properties of the coating.

[0011] In a further embodiment, the material of the drill pipe is nitriding special steel 38CrMoAl, wherein the 38CrMoAl steel material used for the drill pipe should meet the quality requirements of the relevant national standards or industry standards for nitriding special steel, and the content of key elements (such as chromium, molybdenum, aluminum, etc.) in the chemical composition should be controlled within the specified accurate range to ensure the performance stability and consistency of the steel material; the internal organizational structure of the steel material should be tested by metallographic analysis and other methods to ensure that it reaches the expected organizational state after heat treatment and has good comprehensive mechanical properties.

[0012] In a further embodiment, the flow guide is arranged as an elliptical cylindrical through slot, wherein the flow guide is arranged as an elliptical cylindrical through slot, and the ratio of the major axis to the minor axis is carefully determined by considering factors such as drilling fluid flow rate, flow velocity, and internal space utilization of the drill pipe; and the flow guide can also be arranged as a polygonal hollow, such as a hexagonal hollow or an octagonal hollow structure; when a polygonal hollow shape is used, the number of sides and the internal angle of the polygon are accurately designed to balance the flow guiding effect and structural strength; compared with circular or elliptical shapes, the polygonal hollow flow guide has unique advantages in certain specific working conditions; the planar structure of its inner wall can guide the drilling fluid to form a regular reflected flow to some extent, promote the mixing and energy distribution of the liquid, and is beneficial to more evenly cooling different parts of the drill bit, especially for some large diameter drill bits or complex formation drilling scenarios with higher cooling uniformity requirements; at the same time, the corner parts of the polygon can be appropriately rounded without affecting the flow guiding performance, to enhance the structural rigidity of the flow guide, so that it can better withstand the pressure and vibration during drilling to ensure its integrity and reliability in complex stress environment.

[0013] Beneficial effects: 1. By setting multiple thread grooves on the outer periphery of the drill rod body, including multiple clockwise thread grooves and counterclockwise thread grooves uniformly distributed, the effective chip removal purpose of the drill rod in the rotary drilling process is achieved, and the effects of significantly improving the drilling efficiency and reducing the risk of sticking are achieved. In the drilling operation, when the drill rod rotates clockwise, the counterclockwise thread grooves can assist in pushing the drill cuttings outward; and when the drill rod rotates counterclockwise, the clockwise thread grooves play the same role, and this bidirectional chip removal mechanism ensures that the drill cuttings will not accumulate between the drill rod and the hole wall.

[0014] 2. By means of the sequential setting and synergistic cooperation of the nitrogen-oxygen composite treatment layer, the primer coating, the wear-resistant intermediate coating and the surface lubricating coating, the purpose of improving the overall wear resistance of the drill rod is achieved, and the effects of prolonging the service life of the drill rod, reducing the drilling cost and enhancing the adaptability of the drill rod under harsh working conditions are achieved. The nitrogen-oxygen composite treatment layer forms a dense nitride and oxide composite structure on the surface of the drill rod through advanced plasma nitriding and oxidation treatment technology, significantly improves the surface hardness, and provides a solid foundation for the subsequent coating; the primer coating adopts metal ceramic material which is well compatible with each layer, fills the gaps on the surface of the drill rod, enhances the bonding force between the coating and the substrate, and ensures the stability of the entire coating system; the wear-resistant intermediate coating selects high-performance tungsten carbide-based composite material, and uses a unique thermal spraying process to form a high-hardness and high-wear-resistant protective layer, which serves as the main wear-resistant barrier to effectively resist the strong wear of high-hardness rocks and strata; the surface lubricating coating adopts high-molecular polymer material with low friction coefficient and high temperature resistance, which reduces the friction coefficient between the drill rod and the outside world, reduces wear and heat generation, and at the same time, the lubricating effect can also make the drill cuttings more easily discharged, further reducing the wear risk of the drill rod. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0016] Figure 1 It is a structural schematic view of the present application.

[0017] Figure 2 It is a structural schematic view of the present application. Figure 1 It is a structural schematic view of the present application.

[0018] Figure 3 It is a structural schematic view of the present application. Figure 2 It is a structural schematic view of the present application.

[0019] The reference signs in the figure are: 1, drill pipe body; 101, flow guide; 2, nitrogen-oxygen composite treatment layer; 3, primer coating; 4, wear-resistant intermediate coating; 5, surface lubricating coating. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] The embodiment of the application provides a deep nitrogen-oxygen composite treated high wear-resistant drill pipe, which solves the technical problem that the traditional drill pipe is difficult to remove cuttings during use, and the traditional drill pipe has poor wear resistance, and the surface is easily seriously worn during long-time friction with high-hardness rocks and strata, thereby reducing the service life of the drill pipe. In actual use, the effective removal of drill cuttings and the improvement of the overall wear resistance of the drill pipe are realized.

[0022] In order to better understand the above technical scheme, the above technical scheme will be described in detail in combination with the drawings of the specification and specific embodiments.

[0023] Reference Figures 1-3 A deep nitrogen-oxygen composite treated high wear-resistant drill pipe, comprising: a drill pipe body 1, a plurality of threaded grooves are formed on the outer periphery of the drill pipe body 1, and the plurality of threaded grooves include a plurality of clockwise threaded grooves and a plurality of counterclockwise threaded grooves.

[0024] In the drilling process, the efficient removal of drill cuttings and the uniform distribution of the force on the drill pipe. Through the combination of clockwise and counterclockwise threaded grooves, no matter the rotation direction of the drill pipe, the drill cuttings can be smoothly removed along the grooves, avoiding the accumulation of drill cuttings causing the drill pipe to be stuck, and improving the drilling efficiency; at the same time, the uniformly distributed grooves make the drill pipe rotate uniformly, reduce the local stress concentration, prolong the service life of the drill pipe, and enhance the stability and reliability of the drill pipe working in complex geological conditions.

[0025] A flow guide 101 is formed at the center of the drill pipe, and the flow guide 101 penetrates through both ends of the drill pipe, and the flow guide 101 is used to guide the drilling fluid to the drill bit.

[0026] The stable and efficient conveying effect of the drilling fluid to the drill bit is realized.

[0027] A nitrogen-oxygen composite treatment layer 2 is distributed on the outer surface of the drill pipe, and the nitrogen-oxygen composite treatment layer 2 is used to increase the hardness and wear resistance of the surface of the drill pipe.

[0028] The drill pipe surface hardness and wear resistance are significantly improved. By using advanced plasma nitriding and oxidation treatment technology, a dense nitride and oxide composite structure is formed on the outer surface of the drill pipe. This structure can effectively resist the wear of high-hardness rock and stratum on the drill pipe, enhance the corrosion resistance of the drill pipe, keep the drill pipe in good working condition in harsh drilling environment, prolong the overall service life of the drill pipe, reduce the cost of frequent replacement due to drill pipe wear, improve the economic benefit and sustainability of drilling operation, and improve the ability of the drill pipe to cope with complex geological conditions.

[0029] The primer coating 3 is sprayed on the outer periphery of the nitrogen-oxygen composite treatment layer 2, and the primer coating 3 is used to fill the gaps on the surface of the drill pipe after nitrogen-oxygen composite treatment.

[0030] The primer coating 3 is sprayed on the outer periphery of the nitrogen-oxygen composite treatment layer 2, and the primer coating 3 is used to fill the gaps on the surface of the drill pipe after nitrogen-oxygen composite treatment.

[0031] The wear-resistant intermediate coating 4 is arranged on the outer periphery of the primer coating 3, and the wear-resistant intermediate coating 4 is used to further enhance the wear resistance of the drill pipe.

[0032] The wear-resistant intermediate coating 4 is arranged on the outer periphery of the primer coating 3, and the wear-resistant intermediate coating 4 is used to further enhance the wear resistance of the drill pipe.

[0033] The surface lubricating coating 5 is arranged on the outer periphery of the surface lubricating coating 5, and the surface lubricating coating 5 is used to increase the smoothness of the outer surface of the drill pipe.

[0034] The surface lubricating coating 5 made of high polymer material with low friction coefficient and good high temperature resistance is formed on the outer surface of the drill pipe, and a uniform and smooth lubricating film is formed on the wear-resistant intermediate coating 4 through a special coating process, which effectively reduces the friction resistance and heat generation between the drill pipe and the stratum and the drill cuttings, not only helps to improve the rotation efficiency of the drill pipe and reduce the drilling energy consumption, but also reduces the adverse effects of drill pipe wear and heat accumulation caused by friction on the performance of the drill pipe, further improves the durability of the drill pipe and the safety of the drilling operation, and makes the drill pipe play a long-term stable role in the complex and changeable drilling environment.

[0035] The material of the drill pipe is special steel 38CrMoAl for nitriding.

[0036] The drill pipe is highly compatible with the nitrogen-oxygen compound treatment process and provides good comprehensive mechanical properties; this steel material has unique nitriding properties, and during the nitriding treatment process, nitrogen atoms can deeply and uniformly diffuse into the steel material to form stable nitride strengthening phases, further improving the surface hardness and overall strength of the drill pipe.

[0037] The flow guide channel 101 is arranged in the shape of an elliptical cylinder.

[0038] The unique effect of optimizing the flow guiding effect of the drilling fluid while ensuring the structural strength is achieved. The ratio of the major axis to the minor axis is carefully determined by considering various factors, making the flow of the drilling fluid in the flow guide channel 101 more stable and smooth, reducing energy loss, improving flow rate and flow, and ensuring that the drilling fluid can flow efficiently to the drill bit, achieving better cooling and flushing effect, and further enhancing the stability and reliability of the drill pipe in the drilling operation.

[0039] In use, in the process of machining the drill rod, first, the steel 38CrMoAl special for nitriding is selected, which has good nitriding performance and comprehensive mechanical properties; then, the drill rod is roughly machined, and after rough machining, quenching and tempering treatment is performed on the drill rod to optimize the internal structure of the drill rod and improve the overall performance thereof; after finishing, a plurality of clockwise and counterclockwise thread grooves are formed on the periphery of the drill rod body 1 through precise mechanical machining, the depth, width and pitch of the grooves are reasonably designed according to the drilling conditions, so as to effectively assist in chip removal and promote uniform stress of the drill rod in the drilling operation; then, the advanced plasma nitriding and oxidation treatment technology is used to prepare a nitrogen-oxygen composite treatment layer 2 on the outer surface of the drill rod, which greatly increases the surface hardness and wear resistance of the drill rod to resist the friction of the stratum rock; then, the metal ceramic composite material is used to form a base coating 3 on the periphery of the nitrogen-oxygen composite treatment layer 2 through a strictly controlled spraying process, which fills the gaps on the surface of the drill rod, builds a stable foundation for the subsequent coating and enhances the bonding force of the coating system; then, the high-performance tungsten carbide-based composite material is selected to make a wear-resistant intermediate coating 4 on the periphery of the base coating 3 through a unique thermal spraying process, which further improves the wear resistance of the drill rod and deals with the strong wear of high-hardness rock and stratum; finally, the high-molecular polymer material with low friction coefficient is used to apply a surface lubricating coating 5 on the periphery of the wear-resistant intermediate coating 4 through a special coating process, which increases the smoothness of the outer surface of the drill rod, reduces the friction coefficient between the drill rod and the stratum and drill cuttings, reduces the friction resistance and heat generation, and thus improves the durability and safety of the drilling operation of the drill rod in all directions, so that the parts of the drill rod closely cooperate to ensure efficient and stable drilling.

[0040] The figures in the drawings are example figures only, and are intended to more clearly illustrate the key structure and connection relationship of the deep nitrogen-oxygen composite treated high-wear-resistance drill rod of the present application; in actual application, the appearance and size of the device can be adjusted and optimized according to specific needs.

[0041] The present application covers any substitution, modification, equivalent method and scheme made in the essence and scope of the present application. In order for the public to have a thorough understanding of the present application, specific details are described in the above preferred embodiments of the present application, and the present application can also be completely understood without the description of these details for those skilled in the art. In addition, in order to avoid unnecessary confusion of the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0042] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A high-wear-resistant drill pipe with deep nitrogen-oxygen composite treatment, comprising a drill pipe body (1), characterized in that, The drill pipe body (1) has multiple threaded grooves on its outer periphery, including multiple clockwise threaded grooves and multiple counterclockwise threaded grooves.

2. The high wear-resistant drill pipe with deep nitrogen-oxygen composite treatment according to claim 1, characterized in that, Also includes: A flow channel (101) is provided at the center of the drill pipe body (1) and the flow channel (101) runs through both ends of the drill pipe. The flow channel (101) is used to guide the drilling fluid to the drill bit.

3. The high wear-resistant drill pipe with deep nitrogen-oxygen composite treatment according to claim 1, characterized in that, Also includes: A nitrogen-oxygen composite treatment layer (2) is distributed on the outer surface of the drill rod body (1). The nitrogen-oxygen composite treatment layer (2) is used to increase the hardness and wear resistance of the drill rod surface.

4. A high-wear-resistant drill pipe with deep nitrogen-oxygen composite treatment according to claim 3, characterized in that, Also includes: A base coating (3) is sprayed around the nitrogen-oxygen composite treatment layer (2). The base coating (3) is used to fill the gaps on the surface of the drill rod body (1) after nitrogen-oxygen composite treatment.

5. A high-wear-resistant drill pipe with deep nitrogen-oxygen composite treatment according to claim 4, characterized in that, Also includes: A wear-resistant intermediate coating (4) is disposed around the base coating (3), and the wear-resistant intermediate coating (4) is used to enhance the wear resistance of the drill rod.

6. A high-wear-resistant drill pipe with deep nitrogen-oxygen composite treatment according to claim 5, characterized in that, Also includes: A surface lubrication coating (5) is disposed around the surface lubrication coating (5), which is used to increase the smoothness of the outer surface of the drill pipe body (1).

7. A high wear-resistant drill pipe with deep nitrogen-oxygen composite treatment according to claim 6, characterized in that: The drill pipe body (1) is made of nitriding special steel 38CrMoAl.

8. A high wear-resistant drill pipe with deep nitrogen-oxygen composite treatment according to claim 2, characterized in that: The guide channel (101) is configured as an elliptical cylindrical through groove.

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