A fishing device for oilfield downhole perforating charges
The retrieval device, which combines hydraulic drive and remote communication, solves the problem that traditional tools have difficulty in grabbing irregular perforation projectiles, and achieves efficient and safe retrieval of downhole residues, meeting the needs of deep oil and gas extraction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KARAMAY VENTURE CO LTD
- Filing Date
- 2026-04-27
- Publication Date
- 2026-07-24
AI Technical Summary
Traditional salvage tools are unable to effectively capture irregularly shaped bullet remnants, resulting in low salvage efficiency or even failure to complete the operation, and also pose safety hazards.
A device for retrieving perforating projectiles from oilfield wells was designed. It adopts a combination of hydraulic drive and remote communication. Through the telescopic structure of the inner and outer cylinders and the fan-shaped design of the guide head, along with the gripping claw and magnetic ring, it can achieve automated and precise retrieval of perforating projectiles and adapt to high temperature and high pressure environments.
It improves the safety and efficiency of salvage operations, ensures the stable retrieval of perforation shell residues, reduces the risks of downhole operations, adapts to complex downhole environments, and extends the service life of the equipment.
Smart Images
Figure CN122082672B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil extraction equipment technology, specifically to a retrieval device for a perforating projectile in an oil well. Background Technology
[0002] In perforation operations for oil and gas extraction, perforating cartridges are the core equipment for connecting the formation to the wellbore, and their effectiveness directly determines the well's productivity. However, due to the combined effects of the cartridge's own weight, the stability of the detonation system, and the extreme downhole operating environment, perforating cartridges are prone to leaving residues after penetrating the formation. Specifically, complex conditions such as high-temperature and high-pressure environments downhole, casing deformation, and cement sheath detachment, as well as problems such as incomplete detonation of the perforating cartridge, fatigue fracture of the cartridge material, and uneven charge, can all lead to some cartridge body, cartridge case fragments, or undetonated remnants remaining downhole. These perforation shell remnants can directly block the production zone passages, hindering the smooth production of oil and gas and reducing the oil well recovery rate. At the same time, the remnants may jam tools used in subsequent well workover and production enhancement operations, such as bridge plugs, fracturing strings, and sucker rods, leading to operational interruptions. More seriously, unexploded perforation shell remnants pose a risk of accidental explosion, which can easily cause downhole safety accidents, threatening the personal safety of operators and the integrity of downhole equipment, and posing a serious threat to the normal production and operational safety of oil wells.
[0003] Currently, various traditional retrieval tools exist in the industry for retrieving objects from downholes, such as sucker rod retrieval tubes and milling sleeves. However, these tools have significant limitations in retrieving perforation projectile residues and cannot meet actual operational needs. Traditional retrieval tools are mostly designed for regularly shaped objects such as rods, ropes, and small metal fragments. Their gripping structure and force application are incompatible with the irregular shape and special materials of perforation projectile residues, leading to problems such as unstable gripping and slippage during the retrieval process. This results in extremely low retrieval efficiency, increases operational difficulty and time, and may even prevent the retrieval operation from being completed. In severe cases, the retrieval tool may become stuck downhole, causing secondary downhole accidents.
[0004] As oil and gas exploration and development continues to advance into deeper, ultra-deep, and unconventional oil and gas fields, the depth of perforation operations is constantly increasing, and the downhole working environment is becoming increasingly harsh. The frequency of extreme conditions such as high temperature, high pressure, and high corrosion is significantly increasing, further increasing the probability of perforation shell residue and the difficulty of retrieval. The limitations of traditional retrieval tools have become a key bottleneck restricting downhole perforation shell residue retrieval operations, failing to meet the operational needs of deep, ultra-deep, and unconventional oil and gas extraction. Therefore, developing a high-efficiency perforation shell retrieval tool that can adapt to the irregular shape of perforation shells, has anti-jamming functions, and can withstand extreme high-temperature and high-pressure environments has become a technical problem that needs to be solved in the oil and gas extraction field. Summary of the Invention
[0005] The purpose of this invention is to provide a retrieval device for perforated bullets in oilfield wells, so as to solve the problem that traditional retrieval tools have problems such as weak gripping and slippage when retrieval of irregular foreign objects, resulting in extremely low retrieval efficiency or even failure to complete the retrieval operation.
[0006] To achieve the above objectives, the basic solution provided by this invention is as follows: a retrieval device for a perforated projectile in an oilfield well, comprising an upper connector, a control chamber, a retrieval chamber, and a guide head. The upper connector is provided with oil threads, and its end is connected to the flange of the control chamber. The control chamber is provided with a remote communication unit and a hydraulic valve group. The retrieval chamber is divided into an inner cylinder and an outer cylinder. A hydraulic cylinder is provided at the top of the inner wall of the outer cylinder, and the hydraulic cylinder is connected to the end of the inner cylinder. The inner cylinder extends and retracts within the outer cylinder through the drive of the hydraulic cylinder. The control chamber is detachably connected to the outer cylinder. The inner cylinder is provided with a retrieval mechanism for retrieving foreign objects from the well. The guide head is composed of a cone shape formed by several fan-shaped plates, each of which is hinged to the outer cylinder. The inner cylinder is provided with several linkage rods for rotating the corresponding fan-shaped plates.
[0007] The working principle of this invention is as follows: the device is connected and fixed to the downhole operating equipment through the oil thread on the upper connector. The control chamber and the outer cylinder of the retrieval chamber are detachably connected for later maintenance. Several fan-shaped plates of the guide head are hinged to the end of the outer cylinder to form a cone shape, which facilitates the smooth lowering of the device into the well and avoids downhole obstacles. During operation, the remote communication unit in the control chamber realizes signal transmission between the ground and the well. The operator controls the hydraulic valve group in the control chamber through the remote signal. The hydraulic valve group drives the hydraulic cylinder at the top of the inner wall of the outer cylinder of the retrieval chamber to extend and retract, thereby driving the inner cylinder to reciprocate within the outer cylinder. During the movement of the inner cylinder, the linkage rod on it synchronously drives the corresponding fan-shaped plates to rotate, adjusting the opening angle of the guide head to adapt to different working conditions downhole. After the device reaches the position of foreign objects such as perforation projectiles, the retrieval mechanism in the inner cylinder is activated to complete the retrieval of foreign objects. The entire process is automated through hydraulic drive and remote control.
[0008] The beneficial effects of this invention are as follows: The use of hydraulic drive combined with remote communication eliminates the need for personnel to descend into the well, effectively reducing the safety risks of downhole operations. It also improves the accuracy and efficiency of retrieval operations, enabling remote real-time control and adapting to complex downhole environments. The retrieval chamber employs a telescopic structure of the inner and outer cylinders, coupled with a rotatable guide head fan-shaped plate design. This allows for flexible adjustment of the device's posture, navigating complex downhole conditions smoothly, and expanding the retrieval range, ensuring the stable retrieval of foreign objects such as perforating projectiles. The control chamber is detachably connected to the outer cylinder, facilitating the inspection and replacement of internal components, extending the overall service life of the device. Furthermore, the oil thread design of the upper connector ensures the sealing and secure connection between the device and the operating equipment, preventing detachment during operation and improving operational stability and reliability.
[0009] Option 2, an optimized version of the basic option, includes a remote communication unit comprising a PLC control module, a communication module, an environmental monitoring module, a data storage module, and a hydraulic control module. The PLC control module is electrically connected to both the environmental monitoring and hydraulic control modules. The communication module integrates wired and wireless dual-mode communication, and the hydraulic control module is linked with the hydraulic valve group. The data storage module uses a high-temperature resistant non-volatile memory chip, capable of storing downhole environmental parameters, the working status of the retrieval mechanism, and sensor feedback data in real time, with a storage time of no less than 72 hours, facilitating data traceability and fault diagnosis after retrieval operations. It is also equipped with a high-temperature resistant power supply module, powered by a downhole high-temperature resistant lithium battery with a rated operating temperature ≥220℃. It features built-in overcharge, over-discharge, and over-temperature protection circuits and supports cable-assisted power supply, achieving dual power supply redundancy backup to prevent device failure due to downhole power outages.
[0010] Option 3, a preferred option of Option 2, includes a retrieval mechanism comprising a gripping claw composed of several finger-shaped claws. A hydraulic cylinder is connected to the end of each gripping claw, and a hydraulic valve assembly drives the extension and retraction of the hydraulic cylinder. Each claw is hinged with a rubber alloy pad. Using a hydraulic cylinder to drive multiple finger-shaped claws to form the gripping claw, combined with the hinged rubber alloy pads, ensures gripping force while also providing cushioning, impact protection, and safeguarding the retrieved object.
[0011] Option 4, a preferred embodiment of Option 2, includes a retrieval mechanism comprising a casing, a high-temperature resistant samarium-cobalt magnetic ring, and a one-way check basket. The one-way check basket is located at the lower inner side of the inner cylinder and connected to it. The casing is located at the middle inner side of the inner cylinder and connected to it as well. The high-temperature resistant samarium-cobalt magnetic ring is embedded within the casing, and a non-magnetic isolation sleeve is provided between the casing and the magnetic ring. Through the cooperation of the high-temperature resistant samarium-cobalt magnetic ring and the one-way check basket, the adsorption and retrieval of ferromagnetic objects can be achieved, along with one-way positioning, improving the reliability and success rate of retrieval in high-temperature environments.
[0012] Option 5, an optimal choice from the basic option, involves installing heat sinks on the bottom plate of the control compartment. The surface of the heat sinks is treated with tungsten carbide for wear resistance. Installing tungsten carbide-treated heat sinks on the bottom plate of the control compartment enhances heat dissipation, improves the wear resistance of the bottom plate, and extends the service life of the equipment.
[0013] Option 6, an optimal choice from Option 3, features a universal joint at the end of each claw that allows for ±15° adaptive deflection, and each claw's rubber alloy pad is textured with anti-slip patterns. The adaptive deflection universal joint, combined with the anti-slip patterns, allows for adaptive conformation to irregular objects, improving gripping stability and anti-slip performance.
[0014] Option 7, a preferred option of Option 2, features an infrared ranging sensor and a high-temperature resistant miniature camera inside the inner cylinder. The lens of the high-temperature resistant miniature camera is protected by a sapphire lens. Both the infrared ranging sensor and the high-temperature resistant miniature camera are electrically connected to the remote communication unit. This allows for real-time acquisition of high-definition images and distance data from the well, enabling visualized and precise retrieval.
[0015] Option 8, a preferred option of Option 4, consists of a supporting frame and several circumferentially distributed elastic check valves. These valves naturally converge inwards to form a conical one-way channel. This prevents the retrieved object from falling back, significantly improving the success rate of retrieval under high-temperature and complex conditions.
[0016] Option 9, an optimal choice from Option 6, features a high-temperature pressure sensor embedded inside each gripper, with each sensor electrically connected to a PLC control module. This allows for real-time monitoring of gripping pressure, ensuring precise and controllable gripping and preventing damage from overload or insufficient gripping leading to detachment.
[0017] Option 10, which is a preferred option of Option 2, is provided with a sensing and detection component on the guide head. The sensing and detection component is electrically connected to the remote communication unit. The sensing and detection component includes at least two high-temperature resistant inductive proximity sensors and a high-temperature resistant rotary angle sensor. The proximity sensors are symmetrically embedded on the inner side of the guide head fan-shaped plate near the closing point. The angle sensor is coaxially connected to the hinge axis of the fan-shaped plate. Attached Figure Description
[0018] Figure 1 This invention relates to a three-dimensional device for retrieving oilfield downhole perforation projectiles. Figure 1 ; Figure 2 This invention relates to a three-dimensional device for retrieving oilfield downhole perforation projectiles. Figure 2 ; Figure 3 This is an explosion diagram of a retrieval device for an oilfield downhole perforation projectile according to the present invention; Figure 4 This is an exploded schematic diagram of the retrieval compartment and salvage mechanism in Embodiment 2; Figure 5 This is a schematic diagram of the gripping claw structure in a retrieval device for an oilfield downhole perforation projectile according to the present invention. Figure 6 This is a schematic diagram of the structure of the one-way check basket in the retrieval device for an oilfield downhole perforation projectile according to the present invention.
[0019] The reference numerals in the accompanying drawings of the instruction manual include: 1. Upper connector, 2. Control chamber, 201. Remote communication unit, 202. Hydraulic valve group, 203. Heat sink, 3. Retrieval chamber, 301. Inner cylinder, 302. Outer cylinder, 303. Hydraulic cylinder one, 4. Guide head, 401. Fan-shaped plate, 402. Linkage rod, 5. Salvage mechanism, 501. Grabbing claw, 502. Clamping claw, 503. Hydraulic cylinder two, 504. Rubber alloy pad, 505. Housing, 506. High-temperature resistant samarium cobalt magnetic ring, 507. One-way check basket, 508. Non-magnetic isolation sleeve, 509. Universal joint, 510. Support frame, 511. Elastic check valve, 6. Pressure sensor. Detailed Implementation
[0020] The present invention will be further described in detail below through specific embodiments: Example 1 like Figure 1 , 2As shown in Figures 3 and 5: A retrieval device for a perforated projectile in an oilfield well includes an upper connector 1, a control chamber 2, a retrieval chamber 3, and a guide head 4. The upper connector 1 is provided with oil threads, and its end is connected to the flange of the control chamber 2. The control chamber 2 is provided with a remote communication unit 201 and a hydraulic valve group 202. The remote communication unit 201 includes a PLC control module, a communication module, an environmental monitoring module, a data storage module, and a hydraulic control module. The PLC control module is electrically connected to the environmental monitoring module and the hydraulic control module respectively. The communication module integrates wired + wireless dual modes. The hydraulic control module is linked with the hydraulic valve group 202. The retrieval chamber 3 is divided into an inner cylinder 301 and an outer cylinder 302. A hydraulic cylinder 303 is provided on the top of the inner wall of the outer cylinder 302. The inner cylinder 301 is connected to the end of the outer cylinder 302 and extends and retracts within the outer cylinder 302 via the drive of hydraulic cylinder 303. The control chamber 2 is detachably connected to the outer cylinder 302. The inner cylinder 301 is equipped with a retrieval mechanism 5 for retrieving foreign objects from the well. The retrieval mechanism 5 includes a gripping claw 501, which is composed of several finger-shaped claws 502. The end of the gripping claw 501 is connected to a hydraulic cylinder 503, and the hydraulic valve group 202 drives the extension and retraction of the hydraulic cylinder 503. Each claw 502 is hinged with a rubber alloy pad 504, and the end of each claw 502 is equipped with a universal joint 509 that can achieve ±15° adaptive deflection. The rubber alloy pad 504 of each claw 502 is covered with anti-slip texture. The guide head 4 is composed of several fan-shaped plates 401. The inner cylinder 301 is cone-shaped, with each sector 401 hinged to the outer cylinder 302. Several linkage rods 402 on the inner cylinder 301 are used to rotate the corresponding sector 401. A heat sink 203 is attached to the bottom plate of the control chamber 2, with a tungsten carbide wear-resistant surface treatment. An infrared ranging sensor and a high-temperature resistant miniature camera are installed inside the inner cylinder 301. The lens of the high-temperature resistant miniature camera has a sapphire protective lens. Both the infrared ranging sensor and the high-temperature resistant miniature camera are electrically connected to the remote communication unit 201. A high-temperature resistant pressure sensor 6 is embedded inside each claw 502, and each pressure sensor 6 is electrically connected to the PLC control module. A sensing and detection assembly is installed on the guide head 4, and the sensing and detection assembly is electrically connected to the remote communication unit 201. The device includes at least two high-temperature resistant inductive proximity sensors and a high-temperature resistant rotary angle sensor. The proximity sensors are symmetrically embedded inside the guide head fan-shaped plate near the constriction, without protruding from the surface of the fan-shaped plate. They are resistant to temperatures ≥220℃ and have a waterproof sealing rating of not less than IP68. They are embedded using a combination of sealant and metal pressure rings. The installation gap between the sensor and the fan-shaped plate 401 is not greater than 0.5mm. The sensor is used to detect the position of foreign objects at the bottom of the well and transmit the feedback to the remote communication unit 201. The angle sensor is coaxially connected to the hinge shaft of the fan-shaped plate 401. A high-temperature resistant return spring is provided at the joint of the chuck. The overall device can withstand temperatures ≥200℃ and rated working pressure ≥140MPa. The flange connections between the upper connector and the control chamber, and between the control chamber and the retrieval chamber, are sealed with metal ring gaskets.
[0021] A wiring channel for electrical connection between equipment is reserved between the outer cylinder 302 and the inner cylinder 301. Cables and hydraulic oil pipes are built in, and both pass through the upper connector 1 and the control compartment 2 in sequence. The cables are connected to the remote communication unit 201 and various sensing units in the control compartment 2, and the hydraulic oil pipes are connected to the hydraulic equipment in the control compartment 2. The hydraulic oil pipes and cables are sealed at the passage of the compartment with a sintered sealing structure. The outer wall of the whole device is machined with a spiral flow guiding and drag reduction groove, and the surface of the groove is sprayed with a tungsten carbide wear-resistant coating. The hydraulic cylinder has a built-in one-way hydraulic lock. After the gripper 501 clamps in place, it automatically triggers the mechanical wedge self-locking. It still maintains the clamping state when the hydraulic system fails. An emergency mechanical unlocking top rod is provided at the bottom. The outer shell of the remote communication unit 201 adopts a sealed integrated structure, and the inner wall is lined with a high-temperature resistant insulation layer.
[0022] The sensor detection component collects data on the location of the foreign object, the opening and closing angle of the fan-shaped plate, and the contact pressure. All of these data are transmitted to the data storage module of the remote control unit for storage. At the same time, the PLC control module controls the opening and closing of the guide head fan-shaped plate and the action of the retrieval mechanism based on the data feedback. The remote control unit is also equipped with a signal isolation module, which uses photoelectric isolation technology to isolate the sensor signals, hydraulic control signals and communication signals from each other, so as to avoid signal interference that could cause the PLC control module to malfunction.
[0023] The specific implementation method of this embodiment is as follows: The entire salvage device is fixedly connected to the downhole operating equipment via the oil thread on the upper connector 1. The sealing of each flange connection and sealing part is checked to ensure that the cable and hydraulic oil pipe connection is firm and undamaged. The device self-test is started, and the environment inside the cabin is detected by the environmental detection module of the remote communication unit 201. The status of the equipment is detected by each sensor unit. After confirming that all components are normal, the device is slowly lowered into the well. The conical structure of the guide head 4 and the spiral flow guide and drag reduction groove on the outer wall effectively reduce the fluid resistance during the lowering process. At the same time, the fan-shaped plate 401 is in a closed state to facilitate the avoidance of downhole obstacles.
[0024] Next, downhole environment and foreign object detection are performed. During the device's lowering process, the proximity sensor on the guide head 4 detects the specific location of foreign objects such as perforating projectiles at the bottom of the well. When a foreign object such as a perforating projectile is detected, the proximity sensor transmits a signal to the PLC control module. Based on the foreign object location signal fed back by the proximity sensor, the PLC control module controls the hydraulic valve group 202 to operate through the hydraulic control module, driving the hydraulic cylinder 303 to extend and retract, causing the inner cylinder 301 to move within the outer cylinder 302. When the inner cylinder 301 moves, it drives the corresponding sector plate 401 to rotate through the linkage rod 402, adjusting the opening angle of the guide head 4 so that the guide head 4 is aligned with the direction of the foreign object, ensuring that the device can smoothly approach the foreign object. During the adjustment process, the signal isolation module effectively avoids mutual interference between the sensor signals and hydraulic control signals, ensuring the accurate operation of the PLC control module.
[0025] The device continues to penetrate deeper, bringing the foreign object into the inner cylinder 301 through the open end. At this point, an infrared ranging sensor in the inner cylinder 301 continuously monitors the distance to the foreign object. When the distance between the device and the foreign object reaches a preset value, the PLC control module issues a command, which, through the hydraulic control module, controls the hydraulic valve group 202 to drive the hydraulic cylinder 503 to extend or retract, causing the gripper 502 of the grasping claw 501 to open. Simultaneously, a high-temperature resistant miniature camera transmits real-time images of the foreign object. Operators can use a ground control terminal to combine these images with the automatic adjustment of the PLC control module to adjust the position of the gripper 502, aligning it with the foreign object. Subsequently, the hydraulic cylinder 503 extends or retracts in the reverse direction, causing the gripper 502 to close, and the universal joint 50 on the gripper 502... 9. The angle is adaptively adjusted to fit the surface of the foreign object. The anti-slip texture on the rubber alloy pad 504 enhances the clamping friction and prevents the foreign object from slipping. The pressure sensor 6 inside the gripper 502 detects the contact pressure in real time. When the pressure reaches the preset threshold, it sends a feedback signal to the PLC control module. The PLC control module controls the hydraulic cylinder 503 to stop moving. At this time, the one-way hydraulic lock built into the hydraulic cylinder is activated, and the mechanical wedge self-locking is triggered to ensure that the gripper 501 stably clamps the foreign object. Even if the hydraulic system fails, it can still maintain the clamping state. The data collected by each sensor is transmitted to the data storage module of the remote communication unit 201 for storage, and is also transmitted to the PLC control module for analysis and processing.
[0026] Once the foreign object is securely held, the PLC control module controls the hydraulic cylinder 303 to retract, causing the inner cylinder 301 to retract into the outer cylinder 302, storing the foreign object inside the retrieval chamber 3. Simultaneously, the control module closes the fan-shaped plate 401 to reduce resistance during device retrieval. Subsequently, the entire device is slowly lifted using downhole equipment. During the lifting process, the remote communication unit 201 continuously transmits data from various sensors, allowing personnel to monitor the device status and foreign object holding conditions in real time. Once the device reaches the wellhead, the lifting operation stops. If it is necessary to unlock the gripper 501, it can be manually unlocked using the emergency mechanical unlocking rod to remove the gripped perforating bullets and other foreign objects, completing the retrieval operation.
[0027] After the salvage operation is completed, the device is separated from the downhole operating equipment. Since the control chamber 2 and the outer cylinder 302 are detachably connected, the two can be easily disassembled. The components inside the retrieval chamber 3, salvage mechanism 5, and control chamber 2 are inspected and cleaned; the integrity of cables and hydraulic oil pipes is checked and damaged parts are replaced; the sealing performance of each sealing part is checked and aged seals are replaced; the tungsten carbide coating on the surface of the heat sink 203 and the outer wall of the device is inspected, and if there is wear, it is recoated in time to ensure the stability and reliability of the device in the next operation.
[0028] Example 2 like Figure 1 , 2As shown in Figures 4 and 6: The difference from Embodiment 1 is that the salvage mechanism 5 includes a housing 505, a high-temperature resistant samarium cobalt magnetic ring 506, and a one-way check basket 507. The one-way check basket 507 is located at the lower inner side of the inner cylinder 301 and is connected to the inner cylinder 301. The housing 505 is located at the middle inner side of the inner cylinder 301 and is connected to the inner cylinder 301. The high-temperature resistant samarium cobalt magnetic ring 506 is embedded in the housing 505. A non-magnetic isolation sleeve 508 is provided between the housing 505 and the high-temperature resistant samarium cobalt magnetic ring 506. The one-way check basket 507 is composed of a support frame 510 and several circumferentially distributed elastic check valves 511. The elastic check valves 511 naturally converge inward to form a conical one-way channel. A high-temperature resistant reset spring is provided at the root of the elastic check valve. The overall device can withstand a temperature ≥200℃ and a rated working pressure ≥140MPa.
[0029] The specific implementation method of this embodiment is as follows: The difference from Embodiment 1 is that for smaller, difficult-to-grab magnetic impurities in the well, this type of grasping mechanism can be used instead. When the device approaches the foreign object, the infrared ranging sensor detects that the distance between the device and the foreign object reaches a preset value. The PLC control module issues a command, which controls the hydraulic valve group 202 through the hydraulic control module to drive the hydraulic cylinder 303 to extend, causing the inner cylinder 301 to extend downward. At the same time, the opening and closing angle of the fan-shaped plate 401 is adjusted so that the retrieval mechanism 5 approaches the foreign object. At this time, the high-temperature samarium cobalt magnetic ring 506 inside the casing 505 generates a stable magnetic field, which attracts magnetic foreign objects such as perforation shells in the well. Under the action of the magnetic field, the foreign object moves towards the retrieval mechanism 5. After contacting the elastic check valve 511 of the one-way check basket 507, it pushes the shell... The elastic check valve 511 opens towards the inner cylinder 301 and enters the one-way check basket 507. After the foreign object enters, the elastic check valve 511 retracts inward under the action of the high-temperature resistant return spring at the root, restoring the conical one-way channel state and preventing the foreign object from falling out of the one-way check basket 507. During the process, the high-temperature resistant miniature camera transmits the foreign object adsorption and collection status in real time. The staff can monitor it in real time through the ground control terminal. The PLC control module adjusts the position of the inner cylinder 301 according to the feedback signals of the infrared ranging sensor and the proximity sensor to ensure that the foreign object is completely adsorbed and collected in the one-way check basket 507.
[0030] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A retrieval device for a perforating projectile in an oilfield well, characterized in that, The system includes an upper connector (1), a control chamber (2), a retrieval chamber (3), and a guide head (4). The upper connector (1) is provided with oil threads. The end of the upper connector (1) is connected to the flange of the control chamber (2). The control chamber (2) is provided with a remote communication unit (201) and a hydraulic valve group (202). The remote communication unit (201) includes a PLC control module, a communication module, an environmental monitoring module, a data storage module, and a hydraulic control module. The PLC control module is electrically connected to the environmental monitoring module and the hydraulic control module, respectively. The communication module integrates wired + wireless dual modes. The hydraulic control module is linked with the hydraulic valve group (202). The retrieval chamber (3) is divided into an inner cylinder (301) and an outer cylinder (302). The top of the inner wall of the outer cylinder (302) is provided with a hydraulic cylinder (303). The hydraulic cylinder (303) is connected to the end of the inner cylinder (301). The inner cylinder (302) is connected to the flange of the control chamber (202). 301) Driven by hydraulic cylinder 1 (303), it extends and retracts within the outer cylinder (302). The control chamber (2) is detachably connected to the outer cylinder (302). The inner cylinder (301) is equipped with a retrieval mechanism (5) for retrieving foreign objects from the well. The guide head (4) is composed of a cone shape formed by several fan-shaped plates (401). Each fan-shaped plate (401) is hinged to the outer cylinder (302). The inner cylinder (301) is equipped with several connecting rods (402) for rotating the corresponding fan-shaped plates (401). The guide head (4) is equipped with a sensing and detection component. The sensing and detection component is electrically connected to the remote communication unit (201). The sensing and detection component includes at least two high-temperature resistant inductive proximity sensors and high-temperature resistant rotary angle sensors. The proximity sensors are symmetrically embedded on the inner side of the fan-shaped plates of the guide head near the closing point. The angle sensors are coaxially connected to the hinge axis of the fan-shaped plates (401).
2. The retrieval device for an oilfield downhole perforation projectile according to claim 1, characterized in that, The salvage mechanism (5) includes a gripping claw (501), which is composed of several finger-shaped claws (502). The end of the gripping claw (501) is connected to a hydraulic cylinder (503). The hydraulic valve group (202) drives the extension and retraction of the hydraulic cylinder (503). Each claw (502) is hinged with a rubber alloy pad (504).
3. The retrieval device for an oilfield downhole perforation projectile according to claim 1, characterized in that, The salvage mechanism (5) includes a casing (505), a high-temperature samarium cobalt magnetic ring (506), and a one-way check basket (507). The one-way check basket (507) is located at the lower part of the inner side of the inner cylinder (301) and is connected to the inner cylinder (301). The casing (505) is located at the middle part of the inner side of the inner cylinder (301) and is connected to the inner cylinder (301). The high-temperature samarium cobalt magnetic ring (506) is embedded in the casing (505). A non-magnetic isolation sleeve (508) is provided between the casing (505) and the high-temperature samarium cobalt magnetic ring (506).
4. The retrieval device for an oilfield downhole perforation projectile according to claim 1, characterized in that, The bottom plate of the control chamber (2) is provided with heat sinks (203), and the surface of the heat sinks (203) is treated with tungsten carbide for wear resistance.
5. The retrieval device for an oilfield downhole perforation projectile according to claim 2, characterized in that, Each of the claws (502) is provided with a universal joint (509) at its end, which can achieve ±15° adaptive deflection, and the rubber alloy pad (504) of each claw (502) is covered with anti-slip texture.
6. The retrieval device for an oilfield downhole perforation projectile according to claim 1, characterized in that, The inner cylinder (301) is equipped with an infrared ranging sensor and a high-temperature resistant miniature camera. The lens end of the high-temperature resistant miniature camera is equipped with a sapphire protective lens. Both the infrared ranging sensor and the high-temperature resistant miniature camera are electrically connected to the remote communication unit (201).
7. The retrieval device for an oilfield downhole perforation projectile according to claim 3, characterized in that, The one-way check basket (507) is composed of a support frame (510) and several circumferentially distributed elastic check valves (511). The elastic check valves (511) naturally converge inward to form a conical one-way channel.
8. The retrieval device for an oilfield downhole perforation projectile according to claim 5, characterized in that, Each of the claws (502) has a high-temperature pressure sensor (6) embedded on its inner side, and each of the pressure sensors (6) is electrically connected to the PLC control module.