Hydraulic sequential hanging and shearing system for underground cable

Abstract

The invention discloses a hydraulic sequential hanging and shearing system for an underground cable, and the system comprises a device body which is internally provided with a first piston cavity and a second piston cavity, and when the device body is vertically arranged, the first piston cavity and the second piston cavity are arranged in a high-low fall manner; a first piston assembly is slidably arranged in the first piston cavity, and the lower end of the first piston assembly is used for driving a shearing execution mechanism to radially move to shear a cable; a second piston assembly is slidably arranged in the second piston cavity, and the lower end of the second piston assembly is used for driving the suspension execution mechanism to move radially to clamp the cable; the oil injection cavities in the lower portions of the first piston cavity and the second piston cavity are communicated with a low-pressure cavity through a hydraulic oil way system, and the hydraulic system is configured to enable the second piston assembly to act earlier than the first piston assembly when the hydraulic system is conducted. Through the cooperation of a hydraulic loop and a double-piston structure, the reliable action of hanging first and then shearing is achieved, the stability of the whole shearing process and hanging after shearing is ensured, and the fishing success rate is increased.

Description

Technical Field

[0001] This invention relates to the field of downhole retrieval technology, and in particular to a hydraulic sequential suspension and shearing system for downhole cables. Background Technology

[0002] Well logging is a crucial task for drilling platforms. Due to the high complexity of the technology, even slight errors can lead to stuck instruments or objects falling into the well. The successful retrieval of these objects directly impacts the safe acquisition of logging data and the safety of radioactive sources. However, existing retrieval tools suffer from defects such as inaccurate assessment of the object's entry status and secondary falls into the well during the retrieval process, resulting in failed retrieval attempts and causing significant safety accidents and economic losses. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a hydraulic sequential suspension and shearing system for downhole cables. Through the cooperation of hydraulic circuit and double piston structure, a reliable suspension followed by shearing action is achieved, and the stability of the entire shearing process and the suspension after shearing is ensured, so as to improve the success rate of retrieval.

[0004] Technical Solution: To achieve the above objectives, the present invention provides a hydraulic sequential suspension and shearing system for downhole cables, integrated inside a fishing tool, comprising: a device body having a first piston chamber and a second piston chamber inside, wherein when the device body is vertically arranged, the first piston chamber and the second piston chamber are arranged with a height difference; a first piston assembly is slidably disposed in the first piston chamber, the lower end of which is used to drive a shearing actuator to move radially to cut the cable; a second piston assembly is slidably disposed in the second piston chamber, the lower end of which is used to drive a suspension actuator to move radially to clamp the cable; the oil injection chambers at the lower parts of the first piston chamber and the second piston chamber are both connected to a low-pressure cavity through a hydraulic oil circuit system, the hydraulic system being configured to cause the second piston assembly to act before the first piston assembly when it is turned on; an electronically controlled execution module for delaying the activation of the hydraulic oil circuit system; and a triggering mechanism capable of releasing the axial limit of the trigger element by gradually increasing axial thrust when the fishing tool enters the fish; the trigger element, after being released from the limit, generates axial displacement under the continuous axial thrust, triggering the electronically controlled execution module to start after a delay.

[0005] Furthermore, the starting pressure of the first piston assembly is higher than that of the second piston assembly, so that after the hydraulic circuit system is turned on, the second piston assembly moves first to clamp the cable, and then the first piston assembly moves again to cut the cable.

[0006] Furthermore, the static friction between the first piston assembly and the first piston chamber is greater than the static friction between the second piston assembly and the second piston chamber.

[0007] Furthermore, the suspension actuator is a columnar structure composed of multiple circumferentially distributed clamping bodies, which is inserted into the guide hole; each clamping body has an inclined surface at its lower part, which slides in cooperation with the guide cone surface at the lower part of the guide hole; when the second piston assembly moves down along the second piston cavity, it applies an axial thrust to the upper end of the multiple clamping bodies, causing them to converge radially.

[0008] Furthermore, the second piston chamber is an annular gap formed outside the guide hole; the second piston assembly is a cylindrical structure, with its lower part inserted into the annular gap and slidingly engaged with it; the inner wall of the second piston assembly is provided with a radial guide groove, and the upper part of the clamping body is provided with a radial extension portion that slidesly engages with the guide groove.

[0009] Furthermore, the second piston assembly forms the first piston cavity between itself and the device housing, and the lower part of the first piston assembly is slidably disposed within the first piston cavity; a first elastic element is provided between the bottom of the first piston assembly and the bottom of the first piston cavity, which pushes the first piston assembly to fit against the upper end face of the inner cavity of the device housing, and the lower part of the first piston assembly fits against the stepped surface of the outer ring surface of the second piston assembly.

[0010] Furthermore, the first piston assembly includes an upper piston body and a lower piston body, which can slide relative to each other, and a second elastic element is provided between them; when the upper piston body and the lower piston body reach the maximum limit distance, the upper piston body forms an axial limit on the lower piston body, and the second elastic element is in a compressed state.

[0011] Furthermore, a drive sleeve is connected to the upper part of the upper piston body, and the shearing actuator is provided inside the drive sleeve, with the upper part of its inner ring surface being a drive cone surface; the shearing actuator includes two shearing modules that can slide radially relative to each other, and their outer ends are provided with inclined surfaces; when the inclined surfaces are in contact with the drive cone surfaces, the drive sleeve moves down to push the two shearing modules closer to each other.

[0012] Furthermore, the shearing module is slidably disposed within a radial groove, and is initially limited by a shearing pin against the inner wall of the groove.

[0013] Furthermore, the hydraulic circuit system includes a main oil circuit, the upper end of which is connected to the lower chamber of the first piston chamber and the lower chamber of the second piston chamber respectively, and the lower end is connected to the low-pressure cavity; a valve plate is provided on the main oil circuit for blocking the oil circuit; the electronic control execution module includes a limit switch, the trigger end of which is disposed opposite to the trigger element, for sending a signal and starting the micro motor after the trigger element generates a predetermined axial displacement; the micro motor drives a lead screw nut mechanism, the end of which is provided with a piercing nail; after receiving the signal, the micro motor rotates, driving the piercing nail to move axially and pierce the valve plate.

[0014] Beneficial effects: The hydraulic sequential suspension and shearing system for downhole cables of the present invention has at least the following advantages:

[0015] 1. By coordinating the hydraulic circuit with the dual-piston structure and utilizing the downhole hydrostatic pressure as power, the tool must first radially clamp the cable through the suspension actuator to establish a firm anchor point before the shearing actuator cuts the cable above it. This fundamental sequence of "first suspension and anchoring, then shearing" ensures that the cut cable head and the instruments below it are firmly held inside the tool, allowing it to be directly pulled out of the wellhead, greatly simplifying the retrieval process.

[0016] 2. The triggering mechanism uses the continuous axial thrust generated when the retrieval tool connects with the top of the cable fish ("fish entry") to unlock and start the program, rather than relying on downhole pressure pulses or ball dropping, which are easily interfered with. This reduces the risk of false triggering and improves the reliability of operation under complex well conditions.

[0017] 3. By using the electronic control module to achieve a short delay between mechanical triggering and hydraulic system activation, a time window is provided for the tool to adjust to its optimal working state after "entering the fish," ensuring accurate timing of the sequential actions and further improving the success rate of the operation.

[0018] 4. The suspension actuator performs multi-stage clamping and fixing actions, achieving multi-stage stability of the cable before, during, and after shearing, thereby effectively avoiding the risk of the cable falling back into the well and improving the success rate of unblocking and retrieval.

[0019] 5. The overall structure is compact and can be integrated into the retrieval tube, making full use of the well environment and hydrostatic power. It does not require additional huge energy from the ground, simplifying the operation steps and significantly improving the efficiency and safety of cable accident handling. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view of the overall structure of an embodiment of the suspension and shear system of the present invention;

[0021] Figure 2This is a schematic diagram of the structure of one embodiment of the suspension actuator of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of one embodiment of the first piston assembly of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of one embodiment of the shearing actuator of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of one embodiment of the hydraulic circuit system and the electronic control execution module of the present invention. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] As attached Figure 1-5 The hydraulic sequential suspension and shearing system for downhole cables, integrated inside the retrieval tool, includes:

[0027] The device body 1 is composed of an upper connector, a middle cylinder, and a lower guide seat connected by threads. It contains a first piston chamber 2 and a second piston chamber 3, which are coaxially machined at different heights within the middle cylinder. When the device body 1 is vertically positioned, the first piston chamber 2 and the second piston chamber 3 are arranged with a height difference; the first piston chamber 2 is located above the second piston chamber 3.

[0028] A first piston assembly 4 is slidably disposed in the first piston chamber 2, and its lower end is used to drive the shearing actuator 5 to move radially to shear the cable;

[0029] A second piston assembly 6 is slidably disposed in the second piston chamber 3, the lower end of which is used to drive the suspension actuator 7 to move radially to clamp the cable;

[0030] The oil injection chambers at the lower parts of the first piston chamber 2 and the second piston chamber 3 are both connected to a low-pressure cavity through a hydraulic oil circuit system. The hydraulic system is configured to cause the second piston assembly 6 to act before the first piston assembly 4 when it is turned on.

[0031] The starting pressure of the first piston assembly 4 is higher than that of the second piston assembly 6, so that after the hydraulic circuit system is turned on, the second piston assembly 6 will act first to clamp the cable, and then the first piston assembly 4 will act to cut the cable.

[0032] Preferably, the starting pressure difference between the first piston assembly 4 and the second piston assembly 6 is achieved by making the static friction between the first piston assembly 4 and the first piston chamber 2 greater than the static friction between the second piston assembly 6 and the second piston chamber 3. The circumference of the seal of the first piston assembly 4 is greater than the circumference of the seal of the second piston assembly 6 to provide greater static friction.

[0033] The suspension actuator 7 is a columnar structure composed of multiple circumferentially distributed clamping bodies 71, which is inserted into the guide hole 72. Each clamping body 71 has an inclined surface at its lower part, which slides in cooperation with the guide cone surface at the lower part of the guide hole 72. When the second piston assembly 6 moves down along the second piston cavity 3, it applies an axial thrust to the upper end of the multiple clamping bodies 71, causing them to converge radially.

[0034] The second piston chamber 3 is an annular gap formed outside the guide hole 72; the second piston assembly 6 is a cylindrical structure, the lower part of which is inserted into the annular gap and slidably engaged with it; its inner wall is machined with an axial guide keyway to guide the axial movement of the second piston assembly 6 and prevent it from rotating circumferentially.

[0035] The inner wall of the second piston assembly 6 is provided with a radial guide groove, and the upper part of the clamping body 71 is provided with a radial extension, such as a radially protruding guide key. The guide key is embedded in the keyway of the second piston assembly (6) and slides with the keyway, so that the clamping body 71 can move axially with the second piston assembly 6, but is restricted from circumferential rotation.

[0036] The second piston assembly 6 forms the first piston cavity 2 between itself and the device housing. The lower part of the first piston assembly 4 is slidably disposed within the first piston cavity 2. A first elastic element 9 is provided between the bottom of the first piston assembly 4 and the bottom of the first piston cavity 2, which pushes the first piston assembly 4 to fit against the upper end face of the inner cavity of the device housing. The lower part of the first piston assembly 4 fits against the stepped surface of the outer ring surface of the second piston assembly 6. The first piston assembly 4 includes an upper piston body 41 and a lower piston body 42, which can slide relative to each other, and a second elastic element 43 is provided between them. When the upper piston body 41 and the lower piston body 42 reach their maximum limit distance, the upper piston body 41 axially limits the lower piston body 42, and the second elastic element 43 is in a compressed state.

[0037] Based on the above structural description, it can be seen that the first piston assembly 4 is sleeved outside the second piston assembly 6. The upper piston body 41 and the lower piston body 42 of the first piston assembly 4 are pre-compressed by the second elastic element 43, such as a set of disc springs or high-strength compression springs. In the initial state, under the pre-tightening force of the second elastic element 43, the upper shoulder of the upper piston body 41 fits against the stepped surface inside the device housing, while the lower end face of the lower piston body 42 presses against the stepped surface at the upper end of the second piston assembly 6. Due to the axial restraint between the upper and lower piston bodies, the pre-tightening force of the second elastic element 43 keeps the distance between the upper and lower piston bodies stable in the initial state, thus allowing them to be regarded as a whole.

[0038] The upper piston body 41 is connected to a drive sleeve 44. The drive sleeve 44 is equipped with the shearing actuator 5 inside, and the upper part of its inner ring surface is a drive cone surface. The shearing actuator 5 includes two shearing modules 51 that can slide radially relative to each other, and their outer ends are provided with inclined surfaces. When the inclined surfaces are in contact with the drive cone surfaces, the drive sleeve 44 moves down to push the two shearing modules 51 closer to each other.

[0039] The shearing module 51 is slidably disposed within a radial groove, and is initially limited by a shearing pin against the inner wall of the groove. The radial groove is formed on the wall of an axial sleeve, the upper end of which is fixedly connected to the device housing.

[0040] The inner cutting edges of the two shearing modules 51 together form a through hole slightly larger than the diameter of the cable, allowing the cable to pass through. Under the downward pressure of the drive sleeve 44, the two shearing modules 51 can first break the corresponding shearing pin, and then slide synchronously towards the cable, thereby forming a symmetrical shearing force on both sides of the cable.

[0041] An electronically controlled actuator is used to delay the activation of the hydraulic circuit system. The hydraulic circuit system includes a main oil passage 10, which is a long, narrow channel machined within the device body. Its upper end communicates with the lower chambers of the first piston chamber 2 and the second piston chamber 3, respectively, and its lower end communicates with the low-pressure cavity. A valve plate 11, made of a thin metal sheet or a high-strength polymer film, is sealed in the middle of the main oil passage 10 through a small chamber, completely blocking the main oil passage.

[0042] The electronic control execution module includes a limit switch, the trigger end of which is disposed opposite to the trigger element 8, and is used to send a signal and start the micro motor 12 after the trigger element 8 generates a predetermined axial displacement; the limit switch can be a reed switch or a micro switch and fixedly installed in the device housing.

[0043] The micro motor 12 drives a lead screw and nut mechanism. The micro motor 12 and the lead screw and nut mechanism connected to it are fixedly installed near the limit switch. The end of the lead screw of the mechanism is provided with a sharp piercing nail 13, the tip of which is facing the valve plate 11. After receiving a signal, the micro motor 12 rotates, driving the piercing nail 13 to move axially and pierce the valve plate 11.

[0044] The triggering mechanism can release the axial constraint on the trigger element 8 by gradually increasing axial thrust when the retrieval tool enters the well. After the constraint is released, the trigger element 8 will generate axial displacement under the continuous axial thrust, triggering the delayed start of the electronic control execution module. This ensures that the suspension shearing action can only be triggered after the retrieval tool below has completed capturing the fish that has fallen into the well. After shearing, the suspension point and the capture point form two fixed points, one above the other, thus forming a double insurance for the retrieval process and effectively avoiding the risk of the instrument falling into the well again.

[0045] The trigger element 8 consists of two trigger sleeves. The upper trigger sleeve is axially limited within the guide seat at the lower part of the device body 1 by a set of limiting spring pins. The lower trigger sleeve is connected to the upper trigger sleeve by a spring. When the fishing tool enters the well and captures the fish, the tool continues to descend. The bridle at the top of the device generates a thrust on the lower trigger sleeve. This thrust pushes the lower trigger sleeve to gradually slide closer to the upper trigger sleeve, thereby compressing the spring in the middle. This causes the upper trigger sleeve to experience a gradually increasing axial force. When this axial force reaches a certain threshold, all the spring pins are radially pushed open, and the axial limitation of the trigger element 8 is released. After the limitation is released, the trigger element 8 moves into the device under the action of the axial thrust, and its tail triggers the limit switch.

[0046] The limit switch includes an axially sliding slide rod. The trigger 8 contacts the end of the slide rod and pushes the slide rod to move axially. The slide rod actuates the displacement switch, thereby sending an electrical signal to the micro motor 12, causing the puncture nail 13 to advance forward at a constant speed. After a short delay, the puncture nail 13 pierces the valve plate 11, and the originally closed main oil circuit 10 is instantly opened.

[0047] After the main oil circuit 10 is opened, the hydraulic oil in the lower chambers of the first piston chamber 2 and the second piston chamber 3, under the action of huge downhole pressure, has a channel to flow to the low-pressure oil sac. Because the starting pressure of the second piston assembly 6 is relatively low, it is the first to overcome resistance and move downwards. As the second piston assembly 6 moves downwards, its upper step surface disengages from the lower piston body 42 of the first piston assembly 4, releasing the axial constraint on the first piston assembly 4. At this time, the hydraulic oil in the lower chamber of the first piston chamber 2 begins to flow, but because the starting pressure of the first piston assembly 4 is relatively high, it does not move temporarily.

[0048] During this process, as the second piston assembly 6 moves downward, it pushes multiple clamping bodies 71 to converge towards the center along the conical surface of the guide hole 72, eliminating the gap between them and the cable, and achieving initial clamping of the cable.

[0049] As the downhole pressure continues to act, when it is sufficient to overcome the static friction of the first piston assembly 4 and the preload of the first elastic element 9, the first piston assembly 4 begins to move downwards. Subsequently, pressure is reapplied to the stepped surface of the second piston assembly 6, thereby continuing to push the multiple clamping bodies 71 inwards, strengthening the clamping effect on the cable.

[0050] The first piston assembly 4 drives the drive sleeve 44 to move downward. During this process, before the drive sleeve 44 contacts the shearing module 51, the clamping force on the cable is continuously increased, thereby ensuring that the cable is suspended and fixed before shearing.

[0051] When the drive sleeve 44 comes into contact with the shearing module 51, the first elastic element 9 is compressed to near its limit due to the continuous downward movement of the first piston assembly 4, and the downward movement of the lower piston body 42 almost reaches its limit due to the radial limiting effect of the cable on the multiple clamping bodies 71.

[0052] The downhole pressure continues to act, causing the drive cone surface of the inner hole of the drive sleeve 44 to press against the inclined surface on the outside of the shear module 51. When this pressure is sufficient to overcome the strength of the shear pin, it forces the two shear modules 51 to move radially inward, ultimately cutting the cable that has been clamped and fixed.

[0053] After the shear pin breaks, it generates an instantaneous impact force. This force not only acts on the shearing modules, causing them to rapidly approach each other and generate a huge shearing force, but also causes the drive sleeve to undergo a short, rapid axial displacement. This action creates a brief impact, which is transmitted axially to the second piston assembly 6 and ultimately acts on the multiple clamping bodies 71. This forces the clamping bodies 71, which are about to reach their radial displacement limit, to further clamp the cable under the brief impact, thus forming a mechanical interlock based on static friction between the cable, the clamping bodies, and the inner wall of the guide hole 72. This ensures that there is no possibility of loosening during the instrument retrieval process and prevents the instrument from falling back into the well. After the cable is cut, the tool can reliably grab and lift the clamped and cut cable segment and the instrument below it to the surface.

[0054] Due to the presence of the second elastic element 43, the upper piston body 41 and the lower piston body 42 maintain synchronous movement before the shearing action, and can be regarded as a whole. After the shearing pin of the shearing module breaks, the downward movement of the lower piston body 42 is restricted, and the compression of the second elastic element 43 provides space for the further downward movement of the upper piston body 41 and the drive sleeve 44. Thus, while the lower piston body 41 clamps and maintains pressure on the lower cable, it ensures that the cable shearing can be completed smoothly. Moreover, because the cable is firmly clamped, the shearing process is stable and reliable, with no risk of secondary fall into the well.

[0055] In addition, the second elastic element 43 also plays a certain buffering role, preventing the axial impact generated during shearing from directly acting on the second piston assembly 6 and being transmitted to multiple clamping bodies 71, thereby avoiding excessive instantaneous impact and causing over-clamping damage to the cable at the clamping part. Instead, with the buffer of the second elastic element 43, a brief and gentle instantaneous impact is formed to allow the clamping bodies to be further fully clamped.

[0056] In summary, this system achieves a multi-stage suspension and fixing action, from rapid approach to eliminate gaps, to initial clamping and positioning of the cable, to continuous pressure for reliable clamping, and finally to a brief impact to achieve mechanical interlocking. This ensures the stability of the cable before, during, and after shearing, guaranteeing stability both during and after shearing, and improving the success rate of unblocking and retrieval.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the above principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A hydraulic sequential suspension and shearing system for downhole cables, integrated inside a retrieval tool, characterized in that, include: The device body (1) has a first piston chamber (2) and a second piston chamber (3) inside. When the device body (1) is set vertically, the first piston chamber (2) and the second piston chamber (3) are arranged with a height difference. A first piston assembly (4) is slidably disposed in the first piston chamber (2), the lower end of which is used to drive the shearing actuator (5) to move radially to shear the cable; A second piston assembly (6) is slidably disposed in the second piston chamber (3), the lower end of which is used to drive the suspension actuator (7) to move radially to clamp the cable; The oil injection chambers at the lower part of the first piston chamber (2) and the second piston chamber (3) are both connected to a low-pressure cavity through a hydraulic oil circuit system. The hydraulic system is configured to cause the second piston assembly (6) to act before the first piston assembly (4) when it is turned on. The electronic control execution module is used to delay the activation of the hydraulic circuit system; The triggering mechanism can release the axial limit of the trigger (8) by gradually increasing axial thrust when the fishing tool enters the fish; after the limit is released, the trigger (8) generates axial displacement under the continuous axial thrust, triggering the delayed start of the electronic control execution module.

2. The hydraulic sequential suspension and shearing system for downhole cables according to claim 1, characterized in that: The starting pressure of the first piston assembly (4) is higher than that of the second piston assembly (6) so that after the hydraulic circuit system is turned on, the second piston assembly (6) first acts to clamp the cable, and then the first piston assembly (4) acts to cut the cable.

3. The hydraulic sequential suspension and shearing system for downhole cables according to claim 2, characterized in that: The static friction between the first piston assembly (4) and the first piston chamber (2) is greater than the static friction between the second piston assembly (6) and the second piston chamber (3).

4. The hydraulic sequential suspension and shearing system for downhole cables according to claim 1, characterized in that: The suspension actuator (7) is a columnar structure composed of multiple circumferentially distributed clamping bodies (71), which is inserted into the guide hole (72); Each of the clamping bodies (71) has an inclined surface at its lower part, which slides in cooperation with the guide cone surface at the lower part of the guide hole (72); when the second piston assembly (6) moves down along the second piston cavity (3), it applies an axial thrust to the upper end of the multiple clamping bodies (71) to make them radially converge.

5. A hydraulic sequential suspension and shearing system for downhole cables according to claim 4, characterized in that: The second piston chamber (3) is an annular gap formed outside the guide hole (72); the second piston assembly (6) is a cylindrical structure, the lower part of which is inserted into the annular gap and slidably engaged with it; The inner wall of the second piston assembly (6) is provided with a radial guide groove, and the upper part of the clamping body (71) is provided with a radial extension portion that slides in cooperation with the guide groove.

6. A hydraulic sequential suspension and shearing system for downhole cables according to claim 5, characterized in that: The second piston assembly (6) forms the first piston cavity (2) between itself and the device housing, and the lower part of the first piston assembly (4) is slidably disposed in the first piston cavity (2); A first elastic element (9) is provided between the bottom of the first piston assembly (4) and the bottom of the first piston cavity (2), which pushes the first piston assembly (4) to fit against the upper end face of the inner cavity of the device housing, and the lower part of the first piston assembly (4) fits against the stepped surface of the outer ring surface of the second piston assembly (6).

7. A hydraulic sequential suspension and shearing system for downhole cables according to claim 6, characterized in that: The first piston assembly (4) includes an upper piston body (41) and a lower piston body (42), which can slide relative to each other, and a second elastic element (43) is provided between them. When the upper piston body (41) and the lower piston body (42) reach the maximum limit distance, the upper piston body (41) forms an axial limit on the lower piston body (42), and the second elastic element (43) is in a compressed state.

8. The hydraulic sequential suspension and shearing system for downhole cables according to claim 7, characterized in that: The upper piston body (41) is connected to a drive sleeve (44), and the drive sleeve (44) is provided with the shearing actuator (5) inside, and the upper part of its inner ring surface is a drive cone surface; The shearing actuator (5) includes two shearing modules (51) that can slide radially relative to each other, with inclined surfaces at their outer ends; when the inclined surfaces are in contact with the driving cone surface, the driving sleeve (44) moves down to push the two shearing modules (51) closer to each other.

9. A hydraulic sequential suspension and shearing system for downhole cables according to claim 8, characterized in that: The shearing module (51) is slidably disposed in the radial groove, and is initially limited by the shearing pin and the inner wall of the groove.

10. A hydraulic sequential suspension and shearing system for downhole cables according to claim 1, characterized in that: The hydraulic circuit system includes a main oil circuit (10), the upper end of which is connected to the lower chamber of the first piston chamber (2) and the lower chamber of the second piston chamber (3) respectively, and the lower end is connected to the low-pressure cavity; The main oil passage (10) is equipped with a valve plate (11) for blocking the oil passage; The electronic control execution module includes a limit switch, the trigger end of which is disposed opposite to the trigger (8), and is used to send a signal and start the micro motor (12) after the trigger (8) generates a predetermined axial displacement; the micro motor (12) drives a lead screw nut mechanism, the end of which is provided with a piercing nail (13). The micro motor (12) rotates after receiving the signal, driving the puncture nail (13) to move axially and puncture the valve plate (11).

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