An oil well downhole sensor support pre-embedding device
Patent Information
- Application Number
- CN202522571633.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-12-03
AI Technical Summary
1、安装适配性差：固定结构单一，难补偿井壁误差，对传感器尺寸兼容性不足，易偏移松动；
1.安装定位精准且适配性强：通过“机械预固+弹性胀紧”双重固定结构，预固机构的辅助板借扭簧一形成合理夹角，既降低下放阻力，又能通过防滑凸条实现多点机械预卡紧；充气橡胶圈充气后弹性胀紧贴合井壁或套管内壁，同时抵御地层蠕动带来的冲击，避免装置偏移松动，同时可补偿井壁不平整误差，适配不同井径及井壁材质；紧固机构通过扭簧二驱动夹板弹性夹持，橡胶垫一补偿传感器外径微小误差，顶靠机构借弹簧二弹性补偿长度偏差，实现对不同尺寸传感器的自适应安装，大幅降低极端环境下的安装定位难度。
Smart Images
Figure CN224834954U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of downhole detection equipment for oil wells, specifically a pre-embedded support device for downhole sensors in oil wells. Background Technology
[0002] In oil extraction, real-time and accurate monitoring of key parameters such as downhole temperature, pressure, flow rate, and water cut is crucial for ensuring oil production efficiency, optimizing extraction processes, and preventing downhole accidents. For critical areas such as oil-bearing zones and near packers, sensors need to be pre-installed during well completion or workover to achieve long-term continuous monitoring. However, the downhole environment is extremely harsh, facing challenges such as high temperatures of 120-200℃, high pressures of 20-50MPa, formation creep and impact, media corrosion, and uneven well walls, placing stringent requirements on the pre-installed devices.
[0003] The existing downhole sensor pre-embedded devices still have the following problems that urgently need to be solved: 1. Poor installation adaptability: The fixed structure is simple, making it difficult to compensate for well wall errors. It also lacks compatibility with sensor dimensions and is prone to displacement and loosening. 2. The seal is prone to failure: Most of them are single-layer or single-dimensional seals, which are prone to gaps under high temperature and high pressure, allowing fluid and moisture to enter; 3. Insufficient probe protection: The probe lacks a targeted buffer structure, making it susceptible to damage from foreign object collisions or fluid impacts. Summary of the Invention
[0004] To address the problems existing in the background technology, this utility model provides a pre-embedded support device for downhole sensors in oil wells.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a pre-embedded support device for downhole sensors in oil wells, comprising a concave chamber, a sealing ring, a fixed chamber, a sealing ring, pipe fittings, an inflatable rubber ring, an inflatable pipe, a top support mechanism, multiple pre-fixing mechanisms, and multiple fastening mechanisms; The concave chamber has a raised edge at its lower end, an annular groove at its upper end, and pre-fastening mechanisms evenly distributed circumferentially at the lower end of the raised edge. The outer wall of the concave chamber has an external thread, and the inner wall of the concave chamber has multiple fastening mechanisms evenly distributed circumferentially. A sealing ring is provided on the bottom surface of the concave chamber. A through hole is opened at the lower end of the concave chamber, and a protective mechanism is fixed at the lower end of the concave chamber. The protective mechanism is located within the area enclosed by the multiple pre-fastening mechanisms. The lower end of the fixed chamber has a U-shaped groove, and the inner wall of the U-shaped groove has an internal thread that is threadedly connected to the external thread. The surface is fixedly connected to the sealing ring, and the sealing ring is sealed and inserted into the ring groove. The bottom surface of the U-shaped groove is provided with a through hole two, and a top-supporting mechanism is slidably provided in the through hole two. The internal channel of the top-supporting mechanism is connected to the through hole two. The upper end of the fixed chamber is provided with an external thread two, and the lower end of the pipe is provided with an internal thread two and threadedly connected to the external thread two. The outer wall of the pipe is provided with an annular groove, and an inflatable rubber ring is fitted on the annular groove. The air inlet of the inflatable rubber ring is sealed and inserted into the pipe and connected to the inflation pipe. The inflation pipe extends along the inner wall of the pipe.
[0006] Each of the aforementioned pre-fixing mechanisms includes an auxiliary plate, a torsion spring, and multiple anti-slip protrusions; One end of the auxiliary plate is hinged to the lower end of the convex edge of the concave cavity via a torsion spring, and multiple anti-slip convex strips are evenly distributed on the outer wall of the auxiliary plate from top to bottom.
[0007] Each of the fastening mechanisms includes a clamping plate, a rubber pad, and a torsion spring. One end of the clamping plate is hinged to the inner wall of the concave compartment via a torsion spring, and the inner wall of the clamping plate is fixedly connected to a rubber pad.
[0008] The protective mechanism includes a protective ring, an anti-collision ring, and multiple telescopic units; The upper end of the protective ring is fixedly connected to the lower end of the concave compartment. Multiple sliding grooves are evenly distributed along the circumference of the lower end face of the protective ring. Each sliding groove is provided with a telescopic unit. All of the multiple telescopic units are fixedly connected to the anti-collision ring.
[0009] Each of the telescopic units includes a slide rod and a spring. One end of the slide rod is slidably connected to the corresponding slide groove, and the other end of the slide rod is fixedly connected to the anti-collision ring. A spring is fitted on the slide rod, with one end of the spring fixedly connected to the anti-collision ring and the other end of the spring fixedly connected to the protective ring.
[0010] The top-supporting mechanism includes a hollow tube, a top plate, two rubber pads, and two springs. One end of the hollow tube is slidably connected to the through hole two of the fixed chamber, and the internal channel of the hollow tube is connected to the through hole two. The other end of the hollow tube is fixedly connected to the top plate. The top plate has a through hole three and is fixedly connected to the rubber pad two. The rubber pad two has a through hole four corresponding to the through hole three. The spring two is fitted on the hollow tube. One end of the spring two is fixedly connected to the bottom surface of the U-shaped groove of the fixed chamber, and the other end of the spring two is fixedly connected to the top plate.
[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. Precise installation and positioning with strong adaptability: Through a dual fixing structure of "mechanical pre-fixation + elastic expansion", the auxiliary plate of the pre-fixation mechanism forms a reasonable angle with the torsion spring, which reduces the lowering resistance and achieves multi-point mechanical pre-clamping through the anti-slip convex strip; the inflatable rubber ring expands elastically after inflation to fit against the well wall or casing inner wall, while resisting the impact of formation creep, preventing the device from shifting or loosening, and can also compensate for the unevenness error of the well wall, adapting to different well diameters and well wall materials; the fastening mechanism drives the clamping plate to elastically clamp through the torsion spring, the rubber pad compensates for the small error of the sensor outer diameter, and the top support mechanism compensates for the length deviation with the elasticity of the spring, realizing adaptive installation of sensors of different sizes, greatly reducing the difficulty of installation and positioning in extreme environments.
[0012] 2. Reliable sealing performance and resistance to extreme environments: A dual sealing system is constructed. The lower end of the sensor is fitted with an oil-resistant and high-pressure-resistant sealing ring to form an axial seal, while the fixed chamber and the concave chamber are formed by an interference fit of the sealing ring to form a radial seal. The dual seals work together to resist the high pressure and high humidity environment downhole. The sealing components are made of special materials such as oil-resistant elastic materials and corrosion-resistant synthetic rubber, and are suitable for the high temperature environment downhole. With the axial clamping force of the top-mounted mechanism, it ensures that all sealing surfaces are tightly fitted, effectively blocking the intrusion of high-pressure fluids and moisture in the well, avoiding seal failure, and protecting the core components of the sensor from corrosion.
[0013] 3. Comprehensive probe protection and stable signal transmission: The protection mechanism adopts a two-stage buffer structure of "anti-collision ring + sliding rod + spring". The wear-resistant rubber anti-collision ring first absorbs the impact of foreign objects or fluid impact, and then the spring converts the impact force into elastic potential energy to achieve buffering and force relief, avoiding damage to the probe due to collision; the sensor wire runs through a closed channel composed of hollow tubes and fittings, completely isolating it from the high-pressure fluid and corrosive media in the well, eliminating interference or interruption in signal transmission, and ensuring accurate and stable data acquisition.
[0014] 4. Convenient operation and low maintenance cost: The whole system adopts a threaded connection method. The steps of sensor pre-installation, fixed chamber sealing and top support, and pipe connection are clear and do not require complicated special tools. The structure of each mechanism is simple, highly coordinated, and the components are highly interchangeable. During subsequent maintenance, the device can be quickly removed by depressurizing and inflating the rubber ring and disassembling the threaded connection, which reduces the difficulty and cost of downhole maintenance. It is suitable for maintenance needs in harsh environments such as high temperature, high pressure and corrosion in downhole, and extends the overall service life of the device.
[0015] In summary, this utility model, through its "multi-layer fixing + double sealing + buffer protection" design, specifically addresses the core pain points of sensors in extreme downhole oil well environments, such as "difficult installation and positioning, easy seal failure, and easy probe damage." It also boasts advantages such as strong installation adaptability, high sealing reliability, comprehensive protection, and convenient operation and maintenance. It can effectively ensure the long-term stable operation of sensors in high-pressure, high-humidity, and multi-collision risk environments, and has significant practical value and promotional significance. Attached Figure Description
[0016] Figure 1 This is a front view of the present invention; Figure 2 This is an exploded view of this utility model; Figure 3 This is a schematic diagram of the internal structure of the fixed compartment of this utility model; Figure 4 This is a schematic diagram of the internal structure of the concave compartment of this utility model; Figure 5 This is a schematic diagram showing the connection relationship between the concave chamber and multiple fastening mechanisms of this utility model. Detailed Implementation
[0017] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.
[0018] This embodiment describes a pre-embedded support device for an oil well downhole sensor, including a concave chamber 1, a sealing ring 4, a fixed chamber 11, a sealing ring 12, a pipe fitting 17, an inflatable rubber ring 18, an inflatable pipe 19, a top support mechanism, multiple pre-fixing mechanisms, and multiple fastening mechanisms. The concave chamber 1 has a raised edge at its lower end, an annular groove at its upper end, and pre-fastening mechanisms evenly distributed circumferentially at the lower end of the raised edge. The outer wall of the concave chamber 1 has an external thread, and the inner wall of the concave chamber 1 has multiple fastening mechanisms evenly distributed circumferentially. A sealing ring 4 is provided on the inner bottom surface of the concave chamber 1. A through hole is opened at the lower end of the concave chamber 1. A protective mechanism is fixed at the lower end of the concave chamber 1, and the protective mechanism is located within the area enclosed by the multiple pre-fastening mechanisms. The fixed chamber 11 has a U-shaped groove at its lower end, and an internal thread on the inner wall of the U-shaped groove that is threaded to the external thread. The lower end face of the fixed chamber 11 is connected to the sealing ring 1. 2. Fixed connection: The sealing ring 12 is sealed and inserted into the annular groove. The bottom surface of the U-shaped groove is provided with a through hole 2. A top-supporting mechanism is slidably provided in the through hole 2. The internal channel of the top-supporting mechanism is connected to the through hole 2. The upper end of the fixed chamber 11 is provided with an external thread 2. The lower end of the pipe fitting 17 is provided with an internal thread 2 and is threadedly connected to the external thread 2. The outer wall of the pipe fitting 17 is provided with an annular groove. An inflatable rubber ring 18 is fitted on the annular groove. The air inlet of the inflatable rubber ring 18 is sealed and inserted into the pipe fitting 17 and is connected to the inflation pipe 19. The inflation pipe 19 extends along the inner wall of the pipe fitting 17.
[0019] Each of the pre-fixing mechanisms includes an auxiliary plate 5, a torsion spring 1, and multiple anti-slip protrusions 6; One end of the auxiliary plate 5 is hinged to the lower end of the protruding edge of the concave cavity 1 by a torsion spring, and multiple anti-slip protrusions 6 are evenly distributed on the outer wall of the auxiliary plate 5 from top to bottom.
[0020] Each of the fastening mechanisms includes a clamping plate 2, a rubber pad 3, and a torsion spring 2; One end of the clamping plate 2 is hinged to the inner wall of the concave chamber 1 by a torsion spring 2, and the inner wall of the clamping plate 2 is fixedly connected to the rubber pad 3.
[0021] The protective mechanism includes a protective ring 7, an anti-collision ring 8, and multiple telescopic units; The upper end of the protective ring 7 is fixedly connected to the lower end of the concave cavity 1. Multiple sliding grooves are evenly distributed along the circumference of the lower end surface of the protective ring 7. Each sliding groove is provided with a telescopic unit. All of the multiple telescopic units are fixedly connected to the anti-collision ring 8.
[0022] Each of the telescopic units includes a slide rod 9 and a spring 10; One end of the slide rod 9 is slidably connected to the corresponding slide groove, and the other end of the slide rod 9 is fixedly connected to the anti-collision ring 8. The spring 10 is fitted on the slide rod 9, one end of the spring 10 is fixedly connected to the anti-collision ring 8, and the other end of the spring 10 is fixedly connected to the protective ring 7.
[0023] The top-supporting mechanism includes a hollow tube 13, a top plate 14, a second rubber pad 15, and a second spring 16; One end of the hollow tube 13 is slidably connected to the through hole two of the fixed chamber 11, and the internal channel of the hollow tube 13 is connected to the through hole two. The other end of the hollow tube 13 is fixedly connected to the top plate 14. The top plate 14 has a through hole three and is fixedly connected to the rubber pad two 15. The rubber pad two 15 has a through hole four corresponding to the through hole three. The spring two 16 is fitted on the hollow tube 13. One end of the spring two 16 is fixedly connected to the bottom surface of the U-shaped groove of the fixed chamber 11, and the other end of the spring two 16 is fixedly connected to the top plate 14.
[0024] To use this invention, it is necessary to first understand its design for the extreme environments of oil wells, including high pressure, high humidity, uneven well walls, and high risk of foreign object collisions. It solves the problems of "difficult installation and positioning, easy seal failure, and easy probe damage" through an integrated structure of "multi-layer fixing + adaptive sealing + buffer protection." The specific operation and principle are as follows: First, the sensor is pre-installed, ensuring that the sensor's dimensions match the inner cavity of the concave chamber 1 and that the probe diameter matches the diameter of the through hole 1. When the sensor is placed into the concave chamber 1, its outer wall compresses the circumferentially distributed fastening mechanism. The clamping plate 2 opens outward due to the pre-tightening force of the torsion spring 2. After the sensor is in place, the torsion spring 2 rebounds, clamping the clamping plate 2 tightly against the sensor. The inner wall rubber pad 3 elastically deforms and adheres to the outer wall of the sensor to compensate for minor errors in the outer diameter, forming a multi-point elastic clamping. At the same time, the lower end of the sensor adheres to the sealing ring 4 made of oil-resistant and high-pressure-resistant rubber material (such as fluororubber with a high temperature of 120-200℃) on the inner bottom surface of the concave chamber 1, achieving a preliminary seal. The sensor probe passes through... The through hole extends into the protective cavity formed by the protective ring 7 and the anti-collision ring 8; then, sealing reinforcement and backing are performed. The fixed chamber 11 is screwed together with the external thread, the internal thread, and the concave chamber 1. The sealing ring 12 (which can be made of oil-resistant elastic material) on the lower end face of the fixed chamber 11 is simultaneously inserted into the annular groove at the upper end of the convex edge. The screw tightening force causes the sealing ring 12 and the annular groove to form a radial seal through an interference fit. When the fixed chamber 11 is continuously tightened downward through the screw connection, the rubber pad 15 of the backing mechanism first contacts the upper end of the sensor. As the tightening force increases, the spring 16 is compressed (adapted to sensors of different lengths), generating an axial tightening force that forces the sensor to... The lower end is pressed against the sealing ring 4, and the deformation of the sealing ring 4 fills the gap to increase the seal. If there is an error in the length of the sensor, the hollow tube 13 can slide along the through hole 2. With the elastic compensation of the spring 2 16, the top force is ensured to be uniform. The sensor wire passes through the through hole 4 (rubber pad 2) → through hole 3 (top plate) → the internal channel of the hollow tube → through hole 2 (bottom surface of the U-shaped groove in the fixed chamber) and extends to the fitting 17. Finally, it extends along the inside of the fitting 17 to the ground. The hollow design of the hollow tube 13 does not affect the sliding and protects the wire. Then, the well positioning and fixing are carried out. After the fitting 17 is threadedly connected to the fixed chamber 11, the device is lowered along the preset installation channel of the oil well. In the pre-fixing mechanism evenly distributed around the lower end, the auxiliary plate 5 forms an angle (15-30°) with the outer wall of the concave chamber by the pre-tightening force of the torsion spring. This angle reduces the resistance of lowering and ensures that the anti-slip convex strip 6 is effectively embedded in the well wall when lifting. It slides against the well wall to reduce resistance. After reaching the preset depth, it is slightly lifted. The torsion spring drives the auxiliary plate 5 to open. The sawtooth anti-slip convex strip 6 on the outer wall is embedded in the well wall or the inner wall of the casing to form a multi-point mechanical pre-clamping to prevent displacement. Then, high-pressure gas (0.5-1) is injected into the inflation rubber ring 18 (the inflation rubber ring 18 can be made of high-pressure resistant and corrosion-resistant synthetic rubber, such as fluororubber or hydrogenated nitrile rubber) through the ground inflation pipe 19.2MPa (suitable for different well diameters), the inflatable rubber ring 18 expands along the annular groove to fit the well wall or casing inner wall, forming a full-circumferential elastic tightening fixation, which can compensate for the unevenness error of the well wall, and use the compressibility of gas to offset the influence of pressure fluctuations; finally, probe protection and signal transmission are performed. When there is a foreign object (rock cuttings, tool fragments) or fluid impact downhole, it first contacts the anti-collision ring 8. After the anti-collision ring 8 is subjected to force, it drives the telescopic unit to retract, the slide rod 9 slides along the slide groove, the spring 10 is compressed, and after converting the impact force into elastic potential energy, the spring 10 rebounds, causing the anti-collision ring 8 to reset and bounce away from the foreign object, realizing two The system features a multi-stage buffer protection system (anti-collision ring 8 is made of wear-resistant rubber, serving as primary buffer; spring 1 is secondary buffer). The electrical wires are entirely enclosed (within a hollow tube and fittings), isolated from high-pressure fluids (≤20MPa) and corrosive media within the well, ensuring stable signal transmission without attenuation or interruption. The synergistic advantages of each mechanism are significant. Pre-fixation and air-filled fixing are adaptable to different well wall materials. Double sealing meets the requirements of high-pressure (≤20MPa) and high-humidity environments. The fastening mechanism adapts to sensor outer diameter errors, the top-mounted mechanism compensates for length deviations, and the air-filled rubber ring adapts to well diameter fluctuations, enhancing the device's versatility and fault tolerance.
[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A pre-embedded support device for downhole sensors in oil wells, characterized in that: It includes a concave chamber (1), a sealing ring (4), a fixed chamber (11), a sealing ring (12), a pipe fitting (17), an inflatable rubber ring (18), an inflatable pipe (19), a top-supporting mechanism, multiple pre-fixing mechanisms, and multiple fastening mechanisms; The concave chamber (1) has a raised edge at its lower end, an annular groove at its upper end, and pre-fixing mechanisms evenly distributed around the lower end of the raised edge. The outer wall of the concave chamber (1) has an external thread, and multiple fastening mechanisms are evenly distributed around the inner wall of the concave chamber (1). A sealing ring (4) is provided on the inner bottom surface of the concave chamber (1). A through hole is opened at the lower end of the concave chamber (1). A protective mechanism is fixed at the lower end of the concave chamber (1). The protective mechanism is located within the area enclosed by multiple pre-fixing mechanisms. The lower end of the fixed chamber (11) has a U-shaped groove, and the inner wall of the U-shaped groove has an internal thread that is threaded to the external thread. The lower end face of the fixed chamber (11) is connected to the sealing ring (12). The sealing ring (12) is fixedly connected to the ring groove. The bottom surface of the U-shaped groove is provided with a through hole two. A top support mechanism is slidably provided in the through hole two. The internal channel of the top support mechanism is connected to the through hole two. The upper end of the fixed chamber (11) is provided with an external thread two. The lower end of the pipe fitting (17) is provided with an internal thread two and is threadedly connected to the external thread two. The outer wall of the pipe fitting (17) is provided with an annular groove. An inflatable rubber ring (18) is fitted on the annular groove. The air inlet of the inflatable rubber ring (18) is sealed and inserted into the pipe fitting (17) and connected to the inflation pipe (19). The inflation pipe (19) extends along the inner wall of the pipe fitting (17).
2. The wellbore downhole sensor support pre-embedded device according to claim 1, characterized in that: Each of the pre-fixing mechanisms includes an auxiliary plate (5), a torsion spring, and multiple anti-slip protrusions (6); One end of the auxiliary plate (5) is hinged to the lower end of the protruding edge of the concave cavity (1) by a torsion spring, and multiple anti-slip protrusions (6) are evenly distributed on the outer wall of the auxiliary plate (5) from top to bottom.
3. The wellbore downhole sensor support pre-embedded device according to claim 1, characterized in that: Each of the fastening mechanisms includes a clamping plate (2), a rubber pad (3), and a torsion spring (2); One end of the clamp (2) is hinged to the inner wall of the concave chamber (1) by a torsion spring, and the inner wall of the clamp (2) is fixedly connected to the rubber pad (3).
4. The wellbore downhole sensor support pre-embedded device according to claim 1, characterized in that: The protective mechanism includes a protective ring (7), an anti-collision ring (8), and multiple telescopic units; The upper end of the protective ring (7) is fixedly connected to the lower end of the concave chamber (1). Multiple sliding grooves are evenly distributed along the circumference of the lower end face of the protective ring (7). Each sliding groove is provided with a telescopic unit. All of the multiple telescopic units are fixedly connected to the anti-collision ring (8).
5. The wellbore downhole sensor support pre-embedded device according to claim 4, characterized in that: Each of the telescopic units includes a slide rod (9) and a spring (10); One end of the slide rod (9) is slidably connected to the corresponding slide groove, and the other end of the slide rod (9) is fixedly connected to the anti-collision ring (8). The spring (10) is fitted on the slide rod (9), and one end of the spring (10) is fixedly connected to the anti-collision ring (8), and the other end of the spring (10) is fixedly connected to the protective ring (7).
6. The wellbore downhole sensor support pre-embedded device according to claim 1, characterized in that: The top support mechanism includes a hollow tube (13), a top plate (14), a second rubber pad (15), and a second spring (16). One end of the hollow tube (13) is slidably connected to the through hole two of the fixed chamber (11), the internal channel of the hollow tube (13) is connected to the through hole two, the other end of the hollow tube (13) is fixedly connected to the top plate (14), the top plate (14) is provided with a through hole three, the top plate (14) is fixedly connected to the rubber pad two (15), the rubber pad two (15) is provided with a through hole four corresponding to the through hole three, the spring two (16) is fitted on the hollow tube (13), one end of the spring two (16) is fixedly connected to the bottom surface of the U-shaped groove of the fixed chamber (11), and the other end of the spring two (16) is fixedly connected to the top plate (14).