A wireline coring electrically controlled bailer system

Abstract

The present application belongs to the technical field of coring drilling, and particularly relates to a rope coring electric control fishing device system. The rope coring electric control fishing device system comprises a controller and an electric control fishing device. The electric control fishing device comprises a pipe body, an electric control valve and a fishing hook installed in the pipe body. The controller is electrically connected with the electric control valve and controls the movable part of the electric control valve to make reciprocating motion. The fishing hook comprises a plurality of gripping arms arranged in groups and capable of relative rotation. The gripping arms have matching structures matched with the movable part, so that the gripping ends of the gripping arms are in a state of being away from each other or a state of being close to each other when the movable part makes reciprocating motion and reaches two terminal positions of the stroke. Through the cooperation of the controller and the electric control valve and the cooperation of the movable part and the fishing hook, the fishing hook can be reliably switched to a gripping state or a releasing state. Therefore, when the inner tube is stuck, an additional decal device is not needed to realize decal, and the cost of accident treatment and rework cost are greatly reduced.

Description

Technical Field

[0001] This invention belongs to the field of coring drilling technology, specifically relating to a wireline coring electrically controlled retrieval system. Background Technology

[0002] Wireline coring drilling technology has been widely used in geological prospecting, hydrogeology and engineering exploration due to its advantages such as high drilling efficiency, high core recovery rate and low labor intensity.

[0003] In existing technologies, a retrieval device is typically used to lower and raise the inner tube within the borehole. The existing retrieval device's hook has an inward-retracting gripping end, forming a recessed latch to pass over the retrieval spearhead at the top of the inner tube and engage with its step. The hook also has an elastic element that locks the spearhead in place. However, when encountering formations with well-developed fractures, karst, or severe leakage, the borehole lacks fluid column resistance, creating a "dry borehole" condition. In this situation, the inner tube's raising and lowering is undamped and highly susceptible to sudden detachment due to wire rope vibration or the steps on the drill pipe's inner wall. The falling inner tube is highly likely to become stuck at drill pipe diameter changes or at the bottom of the borehole, leading to a serious stuck drill accident. In such cases, a release device is needed to release the retrieval device from the inner tube. This release device primarily relies on the impact force generated by its own descent to achieve release. However, in dry hole conditions, the detacher descends at extremely high speeds and its trajectory is prone to deviation, which can severely damage the retrieval equipment and cause the detachment to fail. Once the detachment fails, the only option is usually to lift the drill string, which severely restricts drilling efficiency. Summary of the Invention

[0004] In view of the above problems, the purpose of this invention is to provide a rope-based electro-controlled retrieval system to solve the problems of complex unblocking process and easy damage to the retrieval device in existing retrieval devices.

[0005] A rope coring electrically controlled retrieval system of the present invention includes a controller and an electrically controlled retrieval device. The electrically controlled retrieval device includes a tube body and an electrically controlled valve and a retrieval hook installed in the tube body. The controller is electrically connected to the electrically controlled valve and controls the movable part of the electrically controlled valve to reciprocate relative to the tube body. The retrieval hook is disposed on one side of the movable part of the electrically controlled valve. The retrieval hook includes a group of gripping arms that are rotatable relative to each other. The gripping arms have a mating structure that cooperates with the movable part, so that when the movable part reciprocates and reaches the two end positions of its stroke, the gripping ends of each gripping arm away from the electrically controlled valve are either in an open state that is far away from each other or in a closed state that is close to each other.

[0006] Furthermore, the gripping arm is provided with a guide rail, which constitutes the mating structure. The movable part is provided with a slider that guides and mates with the guide rail. The mating of the gripping arm and the movable part is achieved through the mating of the slider and the guide rail.

[0007] Furthermore, the guide rail is a C-shaped guide rail, and the slider is a T-shaped slider. The end of the T-shaped slider extends into the C-shaped guide rail and engages with the C-shaped guide rail for guidance.

[0008] Furthermore, there are two gripping arms, which are arranged crosswise and hinged together at the middle to form a cross lever structure.

[0009] Furthermore, the electrically controlled valve is a solenoid valve. When energized, the movable part of the solenoid valve moves toward the fishing hook. When de-energized, the movable part moves away from the fishing hook under the action of the solenoid valve's reset mechanism.

[0010] Furthermore, the cable-driven electro-hydraulic retrieval system also includes a composite load-bearing cable. The controller controls the extension and retraction of the composite load-bearing cable to drive the electro-hydraulic retrieval device to rise or fall within the borehole. The outer surface of the composite load-bearing cable is marked with meters to indicate the descent depth.

[0011] Furthermore, the rope coring and electro-controlled retrieval system also includes a tension monitoring device, which is installed at the fixed end of the composite load-bearing cable to monitor the tension changes of the composite load-bearing cable in real time.

[0012] Furthermore, the rope coring electro-controlled retrieval system has a fail-safe mode: in the event of any abnormal working condition such as power failure, short circuit, leakage fault, or receiving a misoperation command, the movable part of the electro-controlled valve moves to the corresponding stroke end, so that the gripping ends of each gripping arm are in a closed state that brings them close to each other.

[0013] Furthermore, the controller integrates a power supply module, a short circuit detection module, a leakage protection module, an overcurrent power-off module, a working indicator module, and a fault alarm module.

[0014] Furthermore, the movable component includes a push rod and a movable member disposed on the push rod, and the slider is disposed on the movable member.

[0015] This invention uses a controller to drive the movable part of the electro-hydraulic valve to reciprocate, and links the movable part with the retrieval hook. When the movable part reaches either end of its reciprocating stroke, the retrieval hook can switch between gripping and releasing the inner tube. This electromechanical linkage design significantly improves the reliability of the retrieval hook's gripping and releasing of the inner tube. In the event of inner tube jamming, the operator can directly switch the retrieval hook to the open state via the controller, achieving safe release. The release process is reliable and simple, completely eliminating reliance on a release device, preventing damage to the retrieval device, and significantly reducing accident handling and rework costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a rope-based electro-controlled retrieval system of the present invention when the retrieval hook is in the released state; Figure 2 This is a schematic diagram of the electrically controlled retrieval device when the retrieval hook is in the grasping state. Figure 3 This is a schematic diagram of the structure in which the slider on the movable part cooperates with the guide rail on the gripping arm.

[0017] In the diagram, 1. Controller; 2. Winch; 3. Electrically controlled retrieval device; 4. Pipe body; 5. Solenoid valve; 6. Push rod; 7. Moving part; 8. Retrieval hook; 9. Grabbing arm; 10. Elastic cylindrical pin; 11. C-shaped guide rail; 12. T-shaped slider; 13. Power supply; 14. Composite load-bearing cable; 15. Second wire connector; 16. Third wire connector; 17. Retrieval spearhead; 18. First wire connector; 19. Wire rope fixing device; 20. Grabbing end; 21. Cable guide. Detailed Implementation

[0018] The core concept of this invention is to use a controller to drive the movable part of an electrically controlled valve to reciprocate, and to link the movable part with a retrieval hook so that when the movable part moves to the two end positions of the reciprocating stroke, the retrieval hook can switch to either a gripping state to grip the inner tube or a releasing state to release the inner tube. This electromechanical linkage design significantly improves the reliability of the retrieval hook in gripping and releasing the inner tube. In the case of inner tube jamming, the operator can directly switch the retrieval hook to the open state through the controller to achieve safe release. The release process is reliable and simple, completely eliminating the dependence on a release device, greatly reducing accident handling costs and rework costs, and is applicable to drilling operations in dry borehole conditions such as deep holes, ultra-deep holes, and lost formations.

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] like Figure 1 As shown, a rope coring electrically controlled retrieval system of the present invention includes a controller 1 and an electrically controlled retrieval device 3. The electrically controlled retrieval device 3 includes a tube body 4 and an electrically controlled valve and a retrieval hook 8 installed in the tube body 4. The controller 1 is electrically connected to the electrically controlled valve and controls the movable part of the electrically controlled valve to reciprocate relative to the tube body 4. Specifically, the lower end of the tube body 4 is an open structure, and the movable part is arranged along the extension direction of the tube body 4 and reciprocates along the extension direction of the tube body 4. The retrieval hook 8 is located on one side of the movable part of the electrically controlled valve. The retrieval hook 8 includes a group of gripping arms 9 that are rotatable relative to each other. Each gripping arm 9 has a mating structure that cooperates with the movable part. When the movable part reciprocates and reaches the two end positions of its stroke, the mating structure on the gripping arm 9 engages with the movable part, causing the gripping ends 20 of each gripping arm 9, which are furthest from the electrically controlled valve, to be either in an open state (away from each other) or a closed state (closed to each other). Thus, the retrieval hook is either in a released state (allowing the inner tube to be released) or in a gripping state (allowing the inner tube to be gripped). Figure 1 , Figure 2As shown, the inner tube is typically equipped with a retrieval spearhead 17. A step is provided between the cylindrical body and the conical end of the retrieval spearhead 17. The gripping end 20 of the gripping arm 9 is equipped with a gripping claw, which engages with the step of the retrieval spearhead 17. When the gripping ends 20 of each gripping arm 9 are in an open state, far apart from each other, the gripping claw has no restrictive effect on the step, and the retrieval hook 8 can release the retrieval spearhead 17. When the gripping ends 20 of each gripping arm 9 are in a closed state, close together, the gripping claw acts on the step, and the retrieval hook 8 can grab the retrieval spearhead 17. This invention achieves precise reciprocating motion of the movable parts through the cooperation of the controller 1 and the electric control valve. Through the cooperation of the movable parts and the retrieval hook 8, the retrieval hook 8 can reliably switch to the gripping state or the release state. The unblocking process is reliable and simple. When the inner tube is stuck, no additional unblocking device is needed to achieve unblocking, avoiding damage to the retrieval device and significantly reducing accident handling costs and rework costs. Therefore, this system is suitable for drilling operations in deep holes, ultra-deep holes, and lost formations. Furthermore, this wireline coring and electrically controlled retrieval system is fully compatible with existing wireline coring drills, requiring no equipment modification and facilitating widespread application.

[0023] There are two gripping arms 9, such as Figure 1 As shown, two gripping arms 9 are arranged crosswise and hinged at the middle by a flexible cylindrical pin 10 to form a cross lever structure. The gripping arms 9 of this invention have a simple structure, saving manufacturing costs. A mating structure is provided on the arm body of the two gripping arms 9 near the movable part. Specifically, the mating structure is as follows: Figure 3 The C-shaped guide rail 11 shown has a movable component equipped with a T-shaped slider 12 that guides and engages with it. The T-shaped slider 12 includes a straight end and a connecting rod perpendicular to the end. The connecting rod is connected to the movable component, and the end extends into the C-shaped guide rail 11. The C-shaped guide rail 11 provides a reliable anti-detachment constraint for the T-shaped slider 12, preventing it from derailing. This fundamentally ensures the reliability of the retrieval hook 8 in grasping and releasing the retrieval spearhead 17. The overall engagement between the T-shaped end and the C-shaped guide rail 11 is smooth, avoiding jamming and failure during use, and achieving efficient transmission between the movable component and the grasping arm 9. Furthermore, the entire process does not rely on any elastic reset elements (such as springs), significantly improving the environmental adaptability and service life of the electrically controlled retrieval device 3 in complex and harsh downhole conditions.

[0024] The electrically controlled valve is a solenoid valve 5. The movable parts include a moving iron core, a push rod 6, and a moving part 7 mounted on the push rod 6. The T-shaped slider 12 is mounted on the moving part 7. The use of the solenoid valve 5 enables a rapid response in which the fishing hook 8 grabs and releases the fishing spearhead 17, and also ensures the absolute reliability of the action execution. At the same time, the use of the solenoid valve 5 also realizes a safety control mechanism of energized release and self-locking upon power failure, which significantly reduces the overall energy consumption of the downhole equipment, gives the system an inherent power failure safety characteristic, fundamentally eliminates the serious accident of accidental detachment of the inner tube, and greatly improves the safety and reliability of drilling operations.

[0025] like Figure 1 As shown, when energized, the movable part of the solenoid valve 5 moves towards the retrieval hook 8. At this time, the T-shaped slider 12 slides within the C-shaped guide rail 11 of the gripping arm 9, causing the gripping arm 9 to rotate around its hinge point. When the movable part reaches the end position, the gripping ends 20 of the two gripping arms 9 move away from each other, and the retrieval hook 8 is in the released state of releasing the retrieval spearhead 17, which can release the inner tube. After briefly maintaining energization, the power is disconnected, as... Figure 2 As shown, in the power-off state, the electric control retrieval device 5 is moved to the upper part of the retrieval spearhead 17. The movable part moves away from the retrieval hook 8 under the action of the reset mechanism of the solenoid valve 5. At this time, the T-shaped slider 12 slides in the opposite direction in the C-shaped guide rail 11, so that the gripping arm 9 rotates in the opposite direction around the hinge point. After the movable part is reset, the gripping ends 20 of the two gripping arms 9 approach each other, and the retrieval hook 8 is in the gripping state of the retrieval spearhead 17.

[0026] The rope-guided electro-hydraulic retrieval system also includes a composite load-bearing cable 14, which comprises an outer steel wire rope and a double-core insulated cable threaded through the outer steel wire rope. Figure 1As shown, the composite load-bearing cable 14 is wound around the winch 2, with one end connected to the wire rope fixing device 19 of the electric retrieval device 3, and the other end connected to the first electrical connector 18 of the winch 2. The ground controller 1 is electrically connected to the first electrical connector 18. A second electrical connector 15 is provided inside the electric retrieval device. The upper and lower ends of the insulated cable integrated inside the composite load-bearing cable 14 are electrically connected to the first electrical connector 18 and the second electrical connector 15, respectively. A third electrical connector 16 is provided on the upper part of the solenoid valve 5, and the second electrical connector 15 is electrically connected to the third electrical connector 16 through the internal cable 21 of the retrieval device. This achieves the electrical connection between the controller 1 and the solenoid valve 5. After connection, the continuity, insulation, waterproofing, and mechanical connection reliability of the circuit must be checked. The outer surface of the composite load-bearing cable 14 is marked with meters to indicate the descent depth. The meters are purely physical markings, allowing ground operators to visually determine the approximate depth of the electric retrieval device and avoid operational errors due to electronic system malfunctions. The cable coring and electro-hydraulic retrieval system of the present invention also includes a tension monitoring device, which is installed at the fixed end of the composite load-bearing cable 14 to monitor the tension changes of the composite load-bearing cable 14 in real time. The composite load-bearing cable 14 at the fixed end is in a static stress state, resulting in the most stable and accurate measurement data. During operation, the depth position of the electro-hydraulic retrieval device 3 is initially determined based on the meter markings on the outer surface of the composite load-bearing cable 14. Then, the feedback from the tension monitoring device at the fixed end is monitored. When the monitored tension value shows a characteristic sudden drop or fluctuation due to impact with the inner tube, the movable part of the solenoid valve 5 is controlled to switch the retrieval hook 8. This fundamentally eliminates misjudgments caused by a single standard, achieves accurate measurement of the depth of the electro-hydraulic retrieval device 3, reduces human judgment errors, and improves construction efficiency by more than 30%. The electric-controlled wire rope coring retrieval system of the present invention also has a fail-safe mode: in the event of any abnormal working condition such as power failure, short circuit, leakage fault, or receiving a misoperation command, the movable part of the solenoid valve 5 resets, causing the gripping ends 20 of each gripping arm 9 to be in a closed state close to each other. Thus, even under extreme working conditions, the system can still ensure that the electric-controlled retrieval device 3 locks onto the target retrieval spearhead 17, avoiding the risk of the retrieval hook opening due to power loss, i.e., preventing the inner tube from falling off and the resulting jamming, thus ensuring the safety of the electric-controlled retrieval device 3 during use.

[0027] The controller 1 integrates a power supply module, a short-circuit detection module, a leakage protection module, an overcurrent cut-off module, a work indication module, and a fault alarm module. This high integration of multiple modules into the controller 1 makes it highly portable at the drilling site. The short-circuit detection module enables the composite load-bearing cable 14 to self-cut off in the event of insulation failure or a short-circuit fault. The work indication and fault alarm modules can convert invisible downhole status and fault information into visible signals on the surface in real time, thus ensuring operational safety in blind-grabbing environments. The wireline coring electrically controlled retrieval system of this invention integrates a triple closed-loop control system of circuit monitoring, depth measurement, and positioning judgment. The method and process are complete, and the safety logic is closed-loop, reliably enabling the intelligent deployment of the electrically controlled retrieval device 3 in dry hole conditions.

[0028] The rope-based electro-controlled retrieval system of the present invention includes the following steps in use: Move the electrically controlled retrieval device 3 to the top of the retrieval spearhead 17. With the power off, make the retrieval hook 8 of the electrically controlled retrieval device 3 grip the retrieval spearhead 17. Then, start the winch 2 to lower the electrically controlled retrieval device 3 into the borehole. Monitor the lowering depth of the electrically controlled retrieval device 3 in real time through the meter mark. After reaching the set position, observe the stress change of the composite load-bearing cable 14 to confirm that the inner tube is in place. Then, energize the solenoid valve 5. The movable part of the solenoid valve 5 moves down, and the retrieval hook 8 is in the release state, completing the release of the inner tube. After briefly maintaining the power supply, disconnect the power supply 13. After the power is off, the movable part of the solenoid valve 5 resets, the retrieval hook 8 returns to the gripping state, and the electrically controlled retrieval device 3 is slowly lifted away from the borehole.

[0029] Regarding the structure of the retrieval hook, the present invention also provides another embodiment. In this embodiment, the two gripping arms of the retrieval hook are bent arms with an overall obtuse angle structure, and the two gripping arms are hinged at their bends. When the movable part moves toward the retrieval hook, the movable part acts on the mating structure, causing the gripping arm 9 to rotate around its hinge point. When the movable part reaches the end of its stroke, the gripping ends of the two gripping arms move closer to each other. When the movable part moves away from the retrieval hook, the movable part acts on the mating structure, causing the gripping arm to rotate in the opposite direction around the hinge point. When the movable part reaches the end of its stroke, the gripping ends of the two gripping arms move away from each other.

[0030] Regarding the so-called electrically controlled valve, the present invention also provides other embodiments. In another embodiment, the electrically controlled valve is an electric valve, that is, a valve driven by a DC motor. The electric valve converts the rotational motion of the motor into the linear reciprocating motion of the valve core, and realizes the switching between the grabbing state and the release state through the cooperation of the valve core and the fishing hook.

[0031] Regarding the cooperation between the movable component and the gripping arm, the present invention also provides other embodiments. In one embodiment, a common guide rail can be provided on the gripping arm 9, and a slider or roller can be provided on the movable component. A return spring is also provided on the gripping arm 9. When the movable component moves towards the retrieval hook, the slider or roller on the movable component guides and cooperates with the common guide rail. When the movable component moves away from the retrieval hook, the return spring resets the gripping arm 9. In another embodiment, the cooperation structure is a force-bearing surface provided on the gripping arm 9. When the movable component moves towards the retrieval hook, the movable component acts on the force-bearing surface, causing the gripping ends of each gripping arm to be in a state of mutual proximity or separation. When the movable component moves away from the retrieval hook, the retrieval hook is reset by the spring.

[0032] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. The scope of protection of this application should be determined by the scope of the claims. Although this application has disclosed the preferred embodiment above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall fall within the scope of the technical solution of this application.

Claims

1. A rope-guided electro-controlled retrieval system for coring, characterized in that, The device includes a controller (1) and an electric retrieval device (3). The electric retrieval device (3) includes a pipe body (4) and an electric control valve and a retrieval hook (8) installed in the pipe body (4). The controller (1) is electrically connected to the electric control valve and controls the movable part of the electric control valve to reciprocate relative to the pipe body (4). The retrieval hook (8) is located on one side of the movable part of the electric control valve. The retrieval hook (8) includes a group of gripping arms (9) that can rotate relative to each other. The gripping arms (9) have a cooperating structure that cooperates with the movable part so that when the movable part reciprocates and reaches the two end positions of the stroke, the gripping ends (20) of each gripping arm (9) away from the electric control valve are in an open state that is far away from each other or a closed state that is close to each other.

2. The rope-guided electro-hydraulic retrieval system according to claim 1, characterized in that, The gripping arm (9) is provided with a guide rail, which constitutes the mating structure. The movable part is provided with a slider that is guided and mated with the guide rail. The gripping arm (9) and the movable part are mated through the mating of the slider and the guide rail.

3. The rope-guided electro-hydraulic retrieval system according to claim 2, characterized in that, The guide rail is a C-shaped guide rail (11), and the slider is a T-shaped slider (12). The end of the T-shaped slider (12) extends into the C-shaped guide rail (11) and is guided and engaged with the C-shaped guide rail (11).

4. The rope-guided electro-hydraulic retrieval system according to any one of claims 1-3, characterized in that, There are two gripping arms (9), which are arranged crosswise and hinged together in the middle to form a cross lever structure.

5. The rope-guided electro-hydraulic retrieval system according to any one of claims 1-3, characterized in that, The electrically controlled valve is a solenoid valve (5). When energized, the movable part of the solenoid valve (5) moves toward the fishing hook (8). When de-energized, the movable part moves away from the fishing hook (8) under the action of the reset mechanism of the solenoid valve (5).

6. The rope-guided electro-hydraulic retrieval system according to any one of claims 1-3, characterized in that, It also includes a composite load-bearing cable (14). The controller (1) controls the extension and retraction of the composite load-bearing cable (14) to drive the electric retrieval device (3) to rise or fall in the borehole. The outer surface of the composite load-bearing cable (14) is marked with meters to indicate the depth of descent.

7. The rope-guided electro-hydraulic retrieval system according to claim 6, characterized in that, It also includes a tensile monitoring device, which is installed at the fixed end of the composite load-bearing cable (14) and is used to monitor the tensile changes of the composite load-bearing cable (14) in real time.

8. The rope-guided electro-hydraulic retrieval system according to any one of claims 1-3, characterized in that, It has a fail-safe mode: in the event of any abnormal working condition such as power failure, short circuit, leakage fault, or receiving a misoperation command, the movable part of the electric control valve moves to the corresponding stroke end, so that the gripping ends (20) of each gripping arm (9) are in a closed state that is close to each other.

9. The rope-guided electro-hydraulic retrieval system according to any one of claims 1-3, characterized in that, The controller (1) integrates a power supply module, a short circuit detection module, a leakage protection module, an overcurrent power cut-off module, a working indicator module, and a fault alarm module.

10. The rope-guided electro-hydraulic retrieval system according to claim 2 or 3, characterized in that: The movable component includes a push rod (6) and a movable part (7) disposed on the push rod (6), and the slider is disposed on the movable part (7).

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