RFID drill pipe tag composite structure and method of manufacture

Abstract

The application provides an RFID drill pipe tag composite structure and a manufacturing method, and relates to the technical fields of intelligent oil and gas drilling equipment and radio frequency identification. The method comprises the following steps: welding an RFID chip on a preset gold-plated pad area of a ceramic antenna structure by using an SMT process to form a radio frequency front-end module; forming a metal shell by precise mechanical processing, and synchronously processing a double-function inner cavity in the metal shell; selecting a PEEK composite material, and completing first injection molding in the inner cavity by using a special mold to form an injection molding bearing base for bearing the radio frequency front-end module; placing the radio frequency front-end module at a preset position in the injection molding bearing base, filling a high-temperature-resistant industrial-grade adhesive into the injection molding bearing base; and completing second injection molding in the limiting inner cavity by using a special mold, so that the injection molding bearing base is entirely coated and locally embedded with the metal shell to form an integrated RFID drill pipe tag composite structure.

Description

Technical Field

[0001] This invention relates to the field of intelligent oil and gas drilling equipment and radio frequency identification technology, and in particular to an RFID drill pipe tag composite structure and manufacturing method. Background Technology

[0002] In oil and gas drilling operations, existing RFID drill pipe tags must withstand extreme conditions such as temperatures exceeding 150°C, pressures exceeding 100MPa, corrosion from highly alkaline drilling fluids with a pH ≥ 10, and full metal encapsulation. Limited by traditional potting or single-injection molding designs, these tags commonly suffer from defects such as radio frequency detuning, seal failure, shell cracking, and electronic module damage, making them unable to support the information collection and tracking management needs throughout the entire drill pipe lifecycle. Summary of the Invention

[0003] The purpose of this invention is to provide an RFID drill pipe tag composite structure and its manufacturing method. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a method for manufacturing an RFID drill pipe tag composite structure, comprising the following steps: Step S1: Design a ceramic antenna structure according to the working conditions of the drill pipe environment, and solder the RFID chip onto the pre-set gold-plated pad area of ​​the ceramic antenna structure using SMT process to form a radio frequency front-end module; Step S2: The metal substrate is integrally formed into a metal shell through precision machining process. The metal shell is simultaneously machined to form a dual-function inner cavity, namely a receiving cavity for accommodating the primary injection molded part and a limiting cavity for accommodating the secondary injection molded part and realizing positioning and limiting. Step S3: Based on the metal shell, PEEK composite material is selected, and the first injection molding is completed in the accommodating cavity with the help of a special mold to form an injection molded support base for supporting the radio frequency front-end module. Step S4: Place the RF front-end module at a preset position inside the injection-molded support base, and fill the injection-molded support base with high-temperature resistant industrial-grade adhesive to completely cover and fix the RF front-end module. Step S5: Using PEEK composite material, a second injection molding is performed in the limiting cavity with the help of a special mold to form an injection-molded inner shell, so that the injection-molded support base is completely covered and partially embedded with the metal shell, finally forming an integrated RFID drill rod tag composite structure.

[0005] Optionally, in step S1, the fabricated RF front-end module is subjected to RF debugging in a non-metallic cladding state to preliminarily verify the basic communication performance of the RF front-end module. If the basic communication performance of the RF front-end module meets the standard, the process proceeds to the next step; if the basic communication performance of the RF front-end module does not meet the standard, the design parameters of the ceramic antenna structure are adjusted.

[0006] Optionally, in step S4, the RF performance of the qualified RF front-end module is tested after it is placed on the injection-molded support base. The impact of bonding and initial support on the communication performance of the RF front-end module is verified. If the communication function of the RF front-end module is normal, proceed to the next step; if the communication function of the RF front-end module is abnormal, check and reseal.

[0007] Optionally, in step S5, the RFID drill pipe tag composite structure is tested for sealing, structural integrity, and radio frequency performance.

[0008] Optionally, in step S2, the metal substrate is made of stainless steel.

[0009] Optionally, in step S5, after the second injection molding, the overall structure is subjected to gradient cooling and constant temperature curing treatment.

[0010] This invention provides an RFID drill pipe tag composite structure manufactured according to a method for manufacturing an RFID drill pipe tag composite structure, comprising: A metal casing, the metal casing being made of stainless steel, having an internal accommodating cavity and a limiting cavity formed therein; An injection-molded support base is disposed within the receiving cavity of the metal shell. The injection-molded support base is made of PEEK composite material and is used to support the radio frequency front-end module. A radio frequency front-end module is disposed within the injection-molded support base. The radio frequency front-end module includes a ceramic antenna structure and an RFID chip soldered onto the ceramic antenna. A high-temperature resistant adhesive sealing layer is filled inside the injection-molded support base to fix and seal the ceramic antenna structure and RFID chip; The injection-molded inner shell is made of PEEK composite material, covers the injection-molded support base, and fits into at least a portion of the inner wall of the metal outer shell.

[0011] Optionally, the limiting cavity includes a top groove, a bottom groove, and a connecting groove. The top groove is located in the recessed area of ​​the upper end face of the metal shell, the bottom groove is located in the recessed area of ​​the lower end face of the metal shell, the connecting groove and the receiving cavity are both located in the middle area of ​​the metal shell, and the receiving cavity is connected to the top groove. There are multiple connecting grooves, and all the connecting grooves are distributed along the circumferential direction of the receiving cavity. The top groove and the bottom groove are connected through the connecting groove.

[0012] Optionally, the injection-molded inner shell includes an injection-molded top cover, an injection-molded bottom cover, and connecting posts. The injection-molded top cover is installed in the top groove, and the outer wall of the injection-molded top cover is fitted with the inner wall of the top groove. The injection-molded bottom cover is installed in the bottom groove, and the outer wall of the injection-molded bottom cover is fitted with the inner wall of the bottom groove. The number of connecting posts is the same as the number of connecting grooves and they are connected one-to-one. The outer wall of the connecting post is fitted with the inner wall of the connecting groove. The injection-molded top cover and the injection-molded bottom cover are connected by the connecting posts.

[0013] The present invention provides a method for manufacturing an RFID drill pipe tag composite structure. The radio frequency front-end module is completely covered by a high-temperature resistant adhesive, and the outer layer is protected by a double-layer PEEK injection molding structure. This can effectively isolate the metal body of the drill pipe from the shielding interference of the RFID radio frequency signal, ensuring that the reading and writing performance of the tag will not be significantly reduced due to metal environment interference or component aging during long-term downhole operation, and maintaining a stable recognition accuracy.

[0014] Both injection molding processes utilize PEEK composite material, which combines high temperature resistance, high pressure resistance, chemical corrosion resistance, and impact resistance, making it suitable for the high-temperature, high-pressure, and highly corrosive working environment of drill pipes. The injection-molded support base formed by the first injection molding provides stable support for the RF front-end module, while the injection-molded inner shell formed by the second injection molding completely encapsulates the support base and fits it into the metal outer shell. Combined with complete encapsulation and fixation by high-temperature resistant industrial-grade adhesive, this achieves "triple protection" (adhesive encapsulation + PEEK injection molding layer + metal outer shell) for the RF front-end module. This effectively isolates the RFID chip and ceramic antenna structure from damage caused by dust, oil, moisture, and mechanical impact, significantly extending the tag's lifespan and reducing tag maintenance and replacement costs.

[0015] The preferred technical solution of the present invention can also produce at least the following technical effects: The interlocking design of the metal shell and two PEEK injection molded parts creates an integrated composite structure for the label, consisting of a metal shell, an injection-molded inner shell, an injection-molded support base, and an RF module. This compact structure eliminates gaps between components, improving sealing and overall integrity. It fits snugly against the drill rod's mounting area, preventing detachment during drill rod rotation and impact operations. Furthermore, the integrated structure offers controllable dimensional accuracy, adapting to standardized installation requirements for drill rods of different specifications, thus enhancing the label's versatility and feasibility for mass production applications.

[0016] The metal casing, as a connecting component of the drill rod, is prone to shielding radio frequency signals due to its metallic material. PEEK composite material, being a non-metallic insulating material, can isolate the radio frequency front-end module from the metal casing through double-layer PEEK injection molding, thereby reducing the interference of the metal casing on the antenna signal and ensuring the reading and writing distance and identification sensitivity of the RFID tag.

[0017] The process proceeds in the following steps: "module integration - shell processing - primary injection molding - module fixing - secondary injection molding - curing and molding". One RF debugging is combined with two RF performance tests to verify the impact of different processes on communication performance. The dual-cavity and dual-injection molding structures have clear division of labor, realizing the integrated and reliable integration of all components and enhancing the vibration resistance and anti-interference capabilities.

[0018] The limiting inner cavity ensures the positioning accuracy of injection molding and packaging; the adhesive and double PEEK injection molding layers provide double fixation and protection; gradient cooling and curing strengthen the interlayer bonding force; debugging and testing verify the communication stability layer by layer; multiple protections extend the service life of RFID drill pipe tags downhole and ensure reliable signal transmission. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front structural diagram of the RFID drill pipe tag composite structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the reverse side of the RFID drill pipe tag composite structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the RFID drill pipe tag composite structure provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the front structure of the RFID drill rod tag composite structure provided in this embodiment of the invention, with the injection-molded inner shell removed; Figure 5 This is a schematic diagram of the reverse side of the RFID drill rod tag composite structure provided in this embodiment of the invention, with the injection-molded inner shell removed. Figure 6 This is an exploded view of the RFID drill rod tag composite structure provided in this embodiment of the invention, with the injection-molded inner shell removed; Figure 7 This is a front view of the injection-molded inner shell of the RFID drill rod tag composite structure provided in an embodiment of the present invention. Figure 8 This is a schematic diagram of the reverse side of the injection-molded inner shell of the RFID drill rod tag composite structure provided in an embodiment of the present invention.

[0021] 1. Radio frequency front-end module in the figure; 2. Metal outer shell; 21. Receiving cavity; 22. Limiting cavity; 221. Top groove; 222. Bottom groove; 223. Connecting groove; 23. Knurling; 3. Injection-molded load-bearing base; 4. Injection-molded inner shell; 41. Injection-molded top cover; 42. Injection-molded bottom cover; 43. Connecting post; 5. High-temperature resistant adhesive sealing layer. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] This invention provides a method for manufacturing an RFID drill pipe tag composite structure, comprising the following steps: Step S1: Based on the working conditions of the drill pipe environment (i.e., long-term high temperature exceeding 150℃, high pressure exceeding 100MPa, strong alkaline drilling fluid corrosion with pH≥10, and metal full-coverage encapsulation, etc.), a ceramic antenna structure with corresponding resistance is designed. The RFID chip is precisely soldered onto the pre-set gold-plated pad area of ​​the ceramic antenna structure using SMT technology to form the radio frequency front-end module 1. The ceramic antenna structure is adapted to the working environment of the drill pipe. The RFID chip is soldered onto the gold-plated pad area using SMT technology. On the one hand, the connection impedance between the RFID chip and the ceramic antenna structure is reduced, ensuring efficient transmission of radio frequency signals. On the other hand, the gold-plated pad has excellent anti-corrosion and anti-wear properties, avoiding problems such as poor contact and signal attenuation in the complex working conditions of the drill pipe downhole, and improving the identification sensitivity and reading distance stability of the tag. It has stronger impact resistance, bending resistance, and high temperature resistance, and can withstand the severe vibration and temperature fluctuations of the drill pipe during downhole operations.

[0026] Step S2: The metal substrate is integrally formed into a metal shell 2 through precision machining. The interior of the metal shell 2 is simultaneously machined to form a dual-function inner cavity, realizing an integrated design of "load-bearing + positioning". The inner cavity 21 is used to accommodate the primary injection molded part, and the inner cavity 22 is used to accommodate the secondary injection molded part and realize positioning and limiting. The accommodating inner cavity 21 provides a precise molding space for the primary injection molded part, while the limiting inner cavity 22 limits and fits the secondary injection molded part. The precise docking of the two injections can be completed without additional positioning tooling, which simplifies the assembly process and ensures the coaxiality and overall structural strength of the composite structure, avoiding component loosening and displacement.

[0027] Step S3: Based on the metal shell 2, PEEK composite material is selected, and the first injection molding is completed in the inner cavity 21 with the help of a special mold to form the injection molded support base 3 for supporting the radio frequency front-end module 1. Step S4: Place the RF front-end module 1 at the preset position within the injection-molded support base 3, and fill the injection-molded support base 3 with a high-temperature resistant industrial-grade adhesive to completely cover and fix the RF front-end module 1. This fills the gap between the RF front-end module 1 and the injection-molded support base 3, preventing the RF front-end module 1 from being worn or displaced due to vibration. On the other hand, the high-temperature resistance of the adhesive can form a synergistic protection with the PEEK material, further improving the temperature resistance of the RF front-end module 1 and preventing the RFID chip or ceramic antenna structure from failing due to high temperatures.

[0028] Step S5: Using PEEK composite material, a second injection molding is performed within the limiting cavity 22 using a special mold to form the injection-molded inner shell 4. This completely encapsulates the injection-molded support base 3 and partially integrates it with the metal outer shell 2, ultimately forming an integrated RFID drill pipe tag composite structure. The present invention provides a method for manufacturing an RFID drill pipe tag composite structure. The radio frequency front-end module 1 is completely encapsulated by a high-temperature resistant adhesive, and the outer layer has a double-layer PEEK injection-molded structure for protection. This effectively isolates the metal body of the drill pipe from shielding interference with the RFID radio frequency signal, ensuring that the tag's read / write performance does not significantly decrease due to metal environment interference or component aging during long-term downhole operations, maintaining a stable recognition accuracy.

[0029] Both injection molding processes utilize PEEK composite material, which possesses properties such as high temperature resistance, high pressure resistance, chemical corrosion resistance, and impact resistance, making it suitable for the high-temperature, high-pressure, and highly corrosive working environment of drill pipes. The injection-molded support base 3 formed by the first injection molding provides stable support for the RF front-end module 1. The injection-molded inner shell 4 formed by the second injection molding completely encapsulates the injection-molded support base 3 and fits it into the metal shell 2. Combined with complete encapsulation and fixation by high-temperature resistant industrial-grade adhesive, this achieves "triple protection" (adhesive encapsulation + PEEK injection molding layer + metal shell) for the RF front-end module 1. This effectively isolates the RFID chip and ceramic antenna structure from damage caused by dust, oil, moisture, and mechanical impact, significantly extending the tag's lifespan and reducing tag maintenance and replacement costs.

[0030] As an optional implementation, in step S1, the processed RF front-end module 1 is subjected to RF debugging in a non-metallic encapsulation state to initially verify the basic communication performance of the RF front-end module 1. This allows for the identification of communication performance deficiencies in the early stages of the production process, preventing the introduction of substandard RF front-end modules 1 into subsequent high-cost processes and reducing material and process losses due to finished product scrap. If the basic communication performance of the RF front-end module 1 meets the standards, the process proceeds to the next step, where the qualified RF front-end module 1 can be placed in a preset position within the injection-molded support base 3. This significantly improves the performance consistency of the final product and reduces quality fluctuations during mass production. If the basic communication performance of the RF front-end module 1 does not meet the standards, the design parameters of the ceramic antenna structure are adjusted instead of destructively disassembling or replacing the RF front-end module 1 entirely. This allows for precise targeted optimization of performance shortcomings, ensuring that the optimized RF front-end module 1 can adapt to the complex metallic interference environment downhole, guaranteeing the stability of core indicators such as the read / write sensitivity and signal transmission distance of the subsequent finished product tags. Through a closed-loop process of "debugging-verification-parameter adjustment", a ceramic antenna structure design scheme that meets performance requirements can be quickly formed, providing standardized parameter basis for subsequent mass production and effectively shortening the product iteration cycle.

[0031] As an optional implementation, in step S4, the RF performance of the qualified RF front-end module 1 after being placed on the injection-molded support base 3 is tested. This verifies the impact of bonding and initial support on the communication performance of the RF front-end module 1. It can specifically verify the sealing effect of the high-temperature resistant industrial-grade adhesive and the structural compatibility of the injection-molded support base 3 on RF signal transmission. This avoids potential problems such as signal attenuation and read / write failures caused by uneven adhesive filling or assembly gaps between the RF front-end module 1 and the injection-molded support base 3, ensuring that the RF front-end module 1 maintains stable communication performance after support fixation. If the communication function of the RF front-end module 1 is normal, the process proceeds to the next step. If the communication function of the RF front-end module 1 is abnormal, it is inspected and resealed. This eliminates assembly defects before secondary injection molding and avoids bringing faulty semi-finished products into subsequent processes, significantly reducing the probability of finished products being scrapped due to substandard RF performance and saving material and process costs in subsequent processes. The testing process simultaneously verified the rationality of the structural design of the injection-molded support base 3, ensuring that it provides stable mechanical support for the RF front-end module 1 without shielding or interfering with the RF signal, thus achieving compatibility and unity between "mechanical load protection" and "RF communication function", laying a reliable performance foundation for subsequent secondary injection molding and packaging.

[0032] As an optional implementation, in step S5, the RFID drill pipe tag composite structure is tested for sealing, structural integrity, and radio frequency performance. This achieves comprehensive verification of the finished product's protective capabilities, mechanical stability, and communication functionality: the sealing test verifies the sealing effect between the metal shell 2 and the PEEK injection molding layer, preventing moisture and dust from entering the well and damaging the radio frequency module; the structural integrity test confirms the mechanical strength of the integrated composite structure, ensuring that the tag is free from cracking or falling off under drill pipe rotation, impact, and vibration conditions; the radio frequency performance test ultimately confirms the read / write sensitivity and signal stability of the finished product in a metal environment, ensuring the effective communication function of the tag throughout its entire lifecycle.

[0033] As an optional implementation, in step S2, the metal substrate is made of stainless steel, specifically 316 stainless steel. Its resistance to pitting corrosion, crevice corrosion, and chloride ion corrosion is far superior to ordinary stainless steel, making it suitable for the high-salt, high-humidity, and highly corrosive working environment of drill pipes. This prevents structural damage and sealing failure of the metal casing 2 due to corrosion, ensuring the structural stability of the label for long-term use. 316 stainless steel also possesses high tensile strength and hardness, giving the metal casing 2 excellent impact and wear resistance.

[0034] As an optional implementation, in step S5, after the second injection molding, the overall structure undergoes gradient cooling and isothermal curing. Gradient cooling uses a gradual cooling method to avoid uneven shrinkage of the PEEK composite material due to rapid cooling, effectively eliminating residual stress inside the injection-molded inner shell 4. The subsequent isothermal curing process further promotes the stabilization of the material's molecular chain arrangement, ensuring the dimensional accuracy of the injection-molded part, preventing cracking and deformation of the injection-molded inner shell 4 due to internal stress release, and ensuring that the fitting gap between it and the metal outer shell 2 is always within the design range, maintaining the sealing performance of the composite structure.

[0035] This invention provides an RFID drill pipe tag composite structure manufactured according to a method for manufacturing an RFID drill pipe tag composite structure, comprising: The metal outer shell 2 is made of stainless steel and has an internal cavity 21 and a limiting cavity 22. The outer diameter of the metal outer shell 2 can be 20.3±0.3mm and the thickness can be 6±0.5mm, which is conducive to stable installation inside the side wall of the drill bit and will not affect the use of the drill bit.

[0036] The injection-molded support base 3 is disposed in the receiving cavity 21 of the metal shell 2. The injection-molded support base 3 is injection molded from PEEK composite material and is used to support the radio frequency front-end module 1. The radio frequency front-end module 1 is set inside the injection-molded support base 3. The radio frequency front-end module 1 includes a ceramic antenna structure and an RFID chip soldered on the ceramic antenna. The RFID chip stores drilling tool information. The drilling tool information in the RFID chip can be transmitted to the terminal device through the ceramic antenna structure. Information can also be entered into the RFID chip through the external terminal device to realize information interconnection and facilitate drilling tool management.

[0037] A high-temperature resistant adhesive sealing layer 5 is filled inside the injection-molded support base 3 to fix and seal the ceramic antenna structure and RFID chip; The injection-molded inner shell 4 is injection-molded from PEEK composite material, covering the injection-molded support base 3 and fitting into at least part of the inner wall of the metal outer shell 2.

[0038] As an optional implementation, the limiting cavity 22 includes a top groove 221, a bottom groove 222, and a connecting groove 223. The top groove 221 is located in the recessed area of ​​the upper end face of the metal shell 2, and the bottom groove 222 is located in the recessed area of ​​the lower end face of the metal shell 2. The connecting groove 223 and the receiving cavity 21 are both located in the middle area of ​​the metal shell 2, and the receiving cavity 21 is connected to the top groove 221. There are multiple connecting grooves 223, and all connecting grooves 223 are distributed along the circumferential direction of the receiving cavity 21. The top groove 221 and the bottom groove 222 are connected through the connecting groove 223. Knurling 23 is provided on the circumferential outer wall of the metal shell 2. Knurling 23 can increase the friction between the label and the drill rod installation part, prevent the label from loosening or falling off during drill rod rotation and impact operations, and improve the reliability of on-site installation. At the same time, the knurled structure facilitates tool clamping and reduces the difficulty of installation and disassembly.

[0039] As an optional implementation, the injection-molded inner shell 4 includes an injection-molded top cover 41, an injection-molded bottom cover 42, and connecting posts 43. The injection-molded top cover 41 is installed in the top groove 221, and the outer wall of the injection-molded top cover 41 is fitted with the inner wall of the top groove 221. The injection-molded bottom cover 42 is installed in the bottom groove 222, and the outer wall of the injection-molded bottom cover 42 is fitted with the inner wall of the bottom groove 222. The number of connecting posts 43 is the same as the number of connecting grooves 223 and they are connected one-to-one. The outer wall of the connecting post 43 is fitted with the inner wall of the connecting groove 223. The injection-molded top cover 41 and the injection-molded bottom cover 42 are connected by the connecting posts 43. The circumferentially uniform distribution of the connecting grooves 223 and the connecting posts 43 makes the stress on the injection-molded inner shell 4 and the metal outer shell 2 more balanced, effectively dispersing the vibration stress during drill pipe operation and preventing structural cracking or fitting failure caused by local stress concentration. Both the top groove 221 and the injection-molded top cover 41 can be star-shaped structures, while both the bottom groove 222 and the injection-molded bottom cover 42 can be annular structures.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for manufacturing an RFID drill pipe tag composite structure, characterized in that, The following steps are included: Step S1: Design a ceramic antenna structure according to the working conditions of the drill pipe environment, and solder the RFID chip onto the gold-plated pad area of ​​the ceramic antenna structure using SMT process to form a radio frequency front-end module (1). Step S2: The metal substrate is integrally formed into a metal shell (2) by precision machining process. The metal shell (2) is simultaneously processed to form a dual-function inner cavity, namely a receiving cavity (21) for accommodating the first injection molded part, and a limiting cavity (22) for accommodating the second injection molded part and realizing positioning and limiting. Step S3: Based on the metal shell (2), PEEK composite material is selected, and the first injection molding is completed in the inner cavity (21) of the accommodating cavity with the help of a special mold to form an injection molded support base (3) for supporting the radio frequency front-end module (1). Step S4: Place the radio frequency front-end module (1) at a preset position in the injection molded support base (3), and fill the injection molded support base (3) with high temperature resistant industrial-grade adhesive so that the radio frequency front-end module (1) is completely covered and fixed. Step S5: Using PEEK composite material, a second injection molding is completed in the limiting inner cavity (22) with the help of a special mold to form an injection-molded inner shell (4), so that the injection-molded support base (3) is completely covered and partially embedded with the metal shell (2), and finally an integrated RFID drill rod tag composite structure is formed.

2. The method for manufacturing the RFID drill pipe tag composite structure according to claim 1, characterized in that, In step S1, the radio frequency front-end module (1) is processed and radio frequency debugging is performed in a non-metallic cladding state to initially verify the basic communication performance of the radio frequency front-end module (1). If the basic communication performance of the radio frequency front-end module (1) meets the standard, the next step is carried out; if the basic communication performance of the radio frequency front-end module (1) does not meet the standard, the design parameters of the ceramic antenna structure are adjusted.

3. The method for manufacturing the RFID drill pipe tag composite structure according to claim 1, characterized in that, In step S4, the radio frequency performance of the qualified radio frequency front-end module (1) is tested after it is placed on the injection molded support base (3). The impact of bonding and initial support on the communication performance of the radio frequency front-end module (1) is verified. If the communication function of the radio frequency front-end module (1) is normal, the next step is carried out. If the communication function of the radio frequency front-end module (1) is abnormal, it is checked and resealed.

4. The method for manufacturing the RFID drill pipe tag composite structure according to claim 1, characterized in that, In step S5, the sealing performance, structural integrity, and radio frequency performance of the RFID drill pipe tag composite structure are tested.

5. The method for manufacturing the RFID drill pipe tag composite structure according to claim 1, characterized in that, In step S2, the metal substrate is made of stainless steel.

6. The method for manufacturing the RFID drill pipe tag composite structure according to claim 1, characterized in that, In step S5, after the second injection molding, the overall structure undergoes gradient cooling and constant temperature curing treatment.

7. An RFID drill pipe tag composite structure manufactured using a method according to any one of claims 1-6, characterized in that, include: The metal shell (2) is made of stainless steel and has an internal cavity (21) and a limiting cavity (22). The injection-molded support base (3) is disposed in the receiving cavity (21) of the metal shell (2). The injection-molded support base (3) is injection molded from PEEK composite material and is used to support the radio frequency front-end module (1). The radio frequency front-end module (1) is disposed in the injection-molded support base (3). The radio frequency front-end module (1) includes a ceramic antenna structure and an RFID chip soldered onto the ceramic antenna. A high-temperature resistant adhesive sealing layer (5) is filled inside the injection-molded support base (3) to fix and seal the ceramic antenna structure and RFID chip; The injection-molded inner shell (4) is injection-molded from PEEK composite material, covers the injection-molded support base (3) and fits into at least part of the inner wall of the metal outer shell (2).

8. The RFID drill pipe tag composite structure according to claim 7, characterized in that, The limiting cavity (22) includes a top groove (221), a bottom groove (222), and a connecting groove (223). The top groove (221) is located in the recessed area of ​​the upper end face of the metal shell (2), and the bottom groove (222) is located in the recessed area of ​​the lower end face of the metal shell (2). The connecting groove (223) and the receiving cavity (21) are both located in the middle area of ​​the metal shell (2), and the receiving cavity (21) is connected to the top groove (221). There are multiple connecting grooves (223), and all the connecting grooves (223) are distributed along the circumferential direction of the receiving cavity (21). The top groove (221) and the bottom groove (222) are connected through the connecting groove (223).

9. The RFID drill pipe tag composite structure according to claim 8, characterized in that, The injection-molded inner shell (4) includes an injection-molded top cover (41), an injection-molded bottom cover (42), and connecting posts (43). The injection-molded top cover (41) is installed in the top groove (221), and the outer wall of the injection-molded top cover (41) is in contact with the inner wall of the top groove (221). The injection-molded bottom cover (42) is installed in the bottom groove (222), and the outer wall of the injection-molded bottom cover (42) is in contact with the inner wall of the bottom groove (222). The number of connecting posts (43) is the same as the number of connecting grooves (223) and they are connected one by one. The outer wall of the connecting post (43) is in contact with the inner wall of the connecting groove (223). The injection-molded top cover (41) and the injection-molded bottom cover (42) are connected by the connecting posts (43).

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