A sealed structure for a drilling resistivity imaging transmitting antenna
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2026-08-11
AI Technical Summary
其中，发射天线作为核心部件，需产生探测井下信息所需的恒定发射电流，其性能稳定性直接影响地面工程师接收信息及指令发送的速率，进而影响实时数据分辨率和钻井时效
本申请通过密封环、密封圈及盖板的多重密封设计，有效阻挡泥浆侵入，采用GF30PEEK材料制作支架和绝缘套，配合高温玻璃丝布缠绕，使导线与橡胶、外壳绝缘值得到保障，从而隔绝电磁干扰。
Smart Images
Figure CN224625888U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of logging instrument technology, specifically a sealed structure for a drilling resistivity imaging transmitting antenna. Background Technology
[0002] High-resolution electrical imaging logging tools (HIMs) can acquire formation resistivity data and generate high-resolution formation images in real time during drilling, which is crucial for geological guidance decisions. The transmitting antenna, as a core component, needs to generate a constant transmission current required for detecting downhole information. Its performance stability directly affects the rate at which surface engineers receive information and send commands, thus impacting real-time data resolution and drilling timeliness.
[0003] However, in practical applications, existing transmitting antennas face harsh environments during logging while drilling, including high temperatures, high pressures, and mud erosion. The existing sealing structure has poor sealing performance and is prone to gaps, which allow mud to enter the antenna, damaging the wires and magnetic core and affecting the stability of the transmitting current. Summary of the Invention
[0004] To address the problems of existing technologies, this utility model provides a sealed structure for a drilling resistivity imaging transmitting antenna, comprising: A drill collar, wherein the drill collar is hollow inside; A sealing assembly, the sealing assembly being connected to the outer surface of the drill collar; A limiting component is connected to the outer surface of the drill collar and is used to seal and limit both ends of the sealing component; A transmitting antenna is connected to the drill collar and is covered by the sealing assembly. The signal transmission end of the transmitting antenna is located in the hollow area inside the drill collar.
[0005] Furthermore, the sealing assembly includes: a sealing ring, an insulating sleeve, and a sealing ring; The surface of the drill collar is provided with at least three sealing grooves, and the sealing ring is provided in the sealing groove; The sealing grooves are spaced apart, with two of them located near both ends of the drill collar; The insulating sleeve is sealed to the outside of the drill collar. One end of the insulating sleeve is sealed to a limiting component at one end of the drill collar. The other end of the insulating sleeve is connected to one end of the sealing ring fitted on the outer surface of the drill collar. The other end of the sealing ring is sealed to the limiting component on the same side. The sealing rings located at one end and the middle of the drill collar are covered by the insulating sleeve, and the sealing rings located at the other end of the drill collar are covered by the limiting member on the same side; The sealing ring covers the transmitting antenna.
[0006] Furthermore, a cover plate is provided on the outer surface of the sealing ring.
[0007] Furthermore, the limiting component includes: a first retaining ring and a second retaining ring; Both the first retaining ring and the second retaining ring are sleeved and connected to the surface of the drill collar, and are respectively located near both ends of the drill collar; The first retaining ring is connected to the drill collar by a first screw, and one end of the first retaining ring is sealed to one end of the insulating sleeve; The second retaining ring is connected to the drill collar by a second screw, and one end of the second retaining ring is sealed to one end of the sealing ring; The sealing ring and the insulating sleeve are located between the first retaining ring and the second retaining ring.
[0008] Furthermore, the transmitting antenna includes: a bracket, a magnetic wrapping tape, and a sealing pin; The bracket is connected to the reserved antenna mounting position of the drill collar; The magnetic wrapping tape is connected to the bracket; The bracket is provided with multiple wire guide grooves for guiding the wires wound on the magnetic tape; The surface of the wire passage groove is wrapped with high-temperature glass fiber cloth to protect the wires inside the wire passage groove; The wire is led out from both ends of the wire groove and connected to the sealing pin. The end of the sealing pin is located in the hollow area of the drill collar. The sealing ring covers the bracket and the magnetic winding.
[0009] Furthermore, the bracket and the insulating cylinder are made of GF30PEEK material.
[0010] The beneficial effects of this utility model are: This application effectively prevents mud intrusion through a multi-seal design of sealing ring, sealing ring and cover plate. The bracket and insulating sleeve are made of GF30PEEK material and wrapped with high temperature glass fiber cloth to ensure the insulation value between the wire and the rubber and shell, thereby isolating electromagnetic interference. Attached Figure Description
[0011] Figure 1 A schematic diagram of the axial cross-sectional structure of the drill collar provided by this utility model; Figure 2 A schematic diagram of the support structure provided by this utility model; Figure 3 A schematic diagram of the structure of the transmitting antenna provided by this utility model.
[0012] Figure label: In the diagram: 1. First retaining ring; 2. First screw; 3. Sealing ring; 4. Insulating sleeve; 5. Sealing pin; 6. Sealing ring; 7. Cover plate; 8. Transmitting antenna; 9. Second screw; 10. Second retaining ring; 11. Drill tip; 12. High-temperature fiberglass cloth; 13. Bracket; 14. Magnetic core winding tape; 15. Wire groove. Detailed Implementation
[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0014] Please see Figure 1-3 This utility model provides a sealed structure for a drilling resistivity imaging transmitting antenna, comprising: Drill collar 11, wherein the drill collar 11 is hollow inside; The drill collar serves as the basic support for the entire sealed structure, providing an installation reference for each component. Its internal hollow area is used to accommodate the signal transmission path of the transmitting antenna, ensuring that the signal can be stably transmitted to the outside. A sealing assembly is fixedly and sealed to the outer surface of the drill collar 11; The sealing assembly includes: a sealing ring 3, an insulating sleeve 4, and a sealing ring 6; The surface of the drill collar 11 is provided with at least 3 sealing grooves, and the sealing ring 3 is provided in the sealing grooves; The sealing grooves are spaced apart, with two of them located near both ends of the drill collar 11. The insulating sleeve 4 is sealed and fitted onto the outside of the drill collar 11. One end of the insulating sleeve 4 is sealed and connected to the limiting component at one end of the drill collar 11. The other end of the insulating sleeve 4 is sealed and connected to one end of the sealing ring 6 fitted onto the outer surface of the drill collar 11. The other end of the sealing ring 6 is sealed and connected to the limiting component on the same side. The sealing ring 3 located at one end and the middle of the drill collar 11 is covered by the insulating sleeve 4, and the sealing ring 3 located at the other end of the drill collar 11 is covered by the limiting member on the same side; The sealing ring 6 covers the transmitting antenna 8.
[0015] A cover plate 7 is fixedly provided on the outer surface of the sealing ring 6; The sealing component is used to seal and protect key areas of the transmitting antenna and drill collar surface, preventing the intrusion of high-temperature and high-pressure mud, fluids and corrosive gases (such as hydrogen sulfide) from the well, and ensuring the insulation performance and structural stability of the transmitting antenna.
[0016] The cover plate is made of P550 material and is fitted to cover the outer surface of the sealing ring, providing physical protection for the sealing ring. This prevents the sealing ring from being directly eroded by drilling mud or collided with sand and gravel during the drilling process, thus avoiding wear or deformation. At the same time, it enhances the structural strength of the sealing ring, helps maintain its shape stability under high pressure, and ensures that the tight fit between the sealing ring and the drill collar and limiting components is not compromised.
[0017] A limiting component is connected to the outer surface of the drill collar 11 and is used to seal and limit the two ends of the sealing component; The limiting component includes: a first retaining ring 1 and a second retaining ring 10; The first retaining ring 1 and the second retaining ring 10 are both fixedly sleeved and connected to the surface of the drill collar 11, and are respectively located near both ends of the drill collar 11; The first retaining ring 1 is connected to the drill collar 11 by the first screw 2, and one end of the first retaining ring 1 is sealed to one end of the insulating sleeve 4; The second retaining ring 10 is connected to the drill collar 11 by the second screw 9, and one end of the second retaining ring 10 is sealed to one end of the sealing ring 6; The sealing ring 6 and the insulating sleeve 4 are located between the first retaining ring 1 and the second retaining ring 10.
[0018] The first and second retaining rings are both made of P550 material, sleeved and connected to the surface of the drill collar, and respectively set near both ends of the drill collar to form axial limiting boundaries for the sealing assembly. The first retaining ring is connected to the drill collar by the first screw (the screw is tightened radially to ensure it is fixed to the drill collar), and one end of the first retaining ring is sealed to one end of the insulating sleeve (the end faces fit tightly together, and the sealing ring at the end of the insulating sleeve forms a double seal). The second retaining ring is connected to the drill collar by the second screw (also tightened radially). One end of the second retaining ring is sealed to one end of the sealing ring (the sealing ring is pressed by the end face, and the sealing ring at the end of the sealing ring enhances the sealing effect). The sealing ring and insulating sleeve are located between the first retaining ring and the second retaining ring. The axial positioning of the two retaining rings prevents the insulating sleeve and sealing ring from shifting axially along the drill collar under drilling vibration or fluid impact, ensuring the relative position stability of each part of the sealing assembly and maintaining the overall sealing performance.
[0019] The transmitting antenna 8 is detachably connected to the drill collar 11. The transmitting antenna 8 is covered by the sealing assembly, and the signal transmission end of the transmitting antenna 8 is located in the hollow area inside the drill collar 11.
[0020] The transmitting antenna 8 includes: a bracket 13, a magnetic wrapping tape 14, and a sealing pin 5; The bracket 13 is fixedly connected to the reserved antenna mounting position of the drill collar 11; The magnetic wrapping tape 14 is fixedly connected to the bracket 13; The bracket 13 is provided with a plurality of wire grooves 15 for guiding the wires wound on the magnetic wrapping tape 14; The surface of the wire passage 15 is wrapped with high-temperature glass fiber cloth 12 to protect the wires inside the wire passage 15. The wire is led out from both ends of the wire groove 15 and fixedly connected to the sealing pin 5. The end of the sealing pin 5 is located in the hollow area of the drill collar 11. The sealing ring 6 covers the bracket 13 and the magnetic winding 14.
[0021] The magnetic winding tape is a winding magnetic core made of nickel-iron-molybdenum superconducting alloy 1J85 (model 09HOU675). After vacuum impregnation and curing, it is connected to the bracket and supported and positioned by the bracket to ensure that it does not shift in high temperature, high pressure and vibration environment. The bracket is equipped with 20 wire guide slots (distributed obliquely along the circumference, with blunted edges to avoid scratching the wires), which are used to accurately guide and position the 20 turns of wires wound on the magnetic tape, so that the wires are neatly wound around the outer circumference of the magnetic tape, preventing the wires from becoming loose or tangled. The surface of the wire passage (i.e., the outer periphery of the wire) is wrapped with high-temperature fiberglass cloth to fix and protect the wire inside the wire passage, preventing the wire from being broken by the flowing rubber during the vulcanization of the sealing ring (high temperature and high pressure environment), and at the same time enhancing the integrity of the wire, magnetic winding, and support. After the wire is led out from both ends of the wire passage, it is welded to the φ8 copper core through 8 rubber sleeves and high-temperature solder, and then connected to the sealing pin. The sealing pin is installed on the drill collar, and its end passes through the drill collar wall and enters the hollow area of the drill collar to realize the signal transmission between the transmitting antenna and the outside. The sealing ring completely covers the bracket and the magnetic winding. Through a vulcanization process, it is tightly bonded to the bracket, the magnetic winding, and the surface of the drill collar, forming a sealed protection for the core components of the transmitting antenna. This ensures the stability of its insulation performance (insulation value between the wire and the sealing ring and the drill collar shell > 500MΩ) and electrical performance (inductance > 5mH, quality factor > 2.5).
[0022] In some embodiments, the bracket 13 and the insulating cylinder are made of GF30PEEK material.
[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A sealed structure for a drilling resistivity imaging transmitting antenna, characterized in that, include; A drill collar, wherein the drill collar is hollow inside; A sealing assembly, the sealing assembly being connected to the outer surface of the drill collar; A limiting component is connected to the outer surface of the drill collar and is used to seal and limit both ends of the sealing component; A transmitting antenna is connected to the drill collar and is covered by the sealing assembly. The signal transmission end of the transmitting antenna is located in the hollow area inside the drill collar.
2. The sealing structure of the drilling resistivity imaging transmitting antenna according to claim 1, characterized in that, The sealing assembly includes: a sealing ring, an insulating sleeve, and a sealing collar; The surface of the drill collar is provided with at least three sealing grooves, and the sealing ring is provided in the sealing groove; The sealing grooves are spaced apart, with two of them located near both ends of the drill collar; The insulating sleeve is sealed to the outside of the drill collar. One end of the insulating sleeve is sealed to a limiting component at one end of the drill collar. The other end of the insulating sleeve is connected to one end of the sealing ring fitted on the outer surface of the drill collar. The other end of the sealing ring is sealed to the limiting component on the same side. The sealing rings located at one end and the middle of the drill collar are covered by the insulating sleeve, and the sealing rings located at the other end of the drill collar are covered by the limiting component on the same side; The sealing ring covers the transmitting antenna.
3. The sealing structure of the drilling resistivity imaging transmitting antenna according to claim 2, characterized in that, A cover plate is provided on the outer surface of the sealing ring.
4. The sealing structure of the drilling resistivity imaging transmitting antenna according to claim 2, characterized in that, The limiting component includes: a first retaining ring and a second retaining ring; Both the first retaining ring and the second retaining ring are sleeved and connected to the surface of the drill collar, and are respectively located near both ends of the drill collar; The first retaining ring is connected to the drill collar by a first screw, and one end of the first retaining ring is sealed to one end of the insulating sleeve; The second retaining ring is connected to the drill collar by a second screw, and one end of the second retaining ring is sealed to one end of the sealing ring; The sealing ring and the insulating sleeve are located between the first retaining ring and the second retaining ring.
5. The sealing structure of the drilling resistivity imaging transmitting antenna according to claim 2, characterized in that, The transmitting antenna includes: a bracket, a magnetic wrapping tape, and a sealing pin; The bracket is connected to the reserved antenna mounting position of the drill collar; The magnetic wrapping tape is connected to the bracket; The bracket is provided with multiple wire guide grooves for guiding the wires wound on the magnetic tape; The surface of the wire passage groove is wrapped with high-temperature glass fiber cloth to protect the wires inside the wire passage groove; The wire is led out from both ends of the wire groove and connected to the sealing pin. The end of the sealing pin is located in the hollow area of the drill collar. The sealing ring covers the bracket and the magnetic winding.
6. The sealing structure of the drilling resistivity imaging transmitting antenna according to claim 5, characterized in that, The bracket and the insulating sleeve are made of GF30PEEK material.