Downhole motor power supply system crossing device and motor unit taking-out method

Abstract

The application relates to a downhole motor power supply system crossing device and a method for taking out a motor unit. The downhole motor power supply system crossing device comprises a crosser, the crosser can be self-sealed, the axial middle part of the crosser comprises a crosser male connector and a crosser female connector, the crosser male connector is connected with the cable core wire of a small flat cable downward through a pin, the crosser female connector is connected with the cable core wire of a power cable upward through a pin, the upper end of the crosser male connector is provided with a fishing head or a fishing neck, a sealing sleeve at the connection position of the crosser female connector and the crosser male connector is provided with a shearing structure, and the shearing structure can limit the crosser female connector and the crosser male connector in opposite directions along the axial direction of the crosser. The device not only simultaneously realizes the operation bearing, operation power supply and operation sealing of the power cable to the electric submersible pump motor unit, but also facilitates the unblocking and taking out of the electric submersible pump motor unit, the pump can be checked without a workover rig, and the unblocking and taking out process will not damage the structure of the crosser male connector and the crosser female connector, so that the device can be repeatedly used.

Description

Technical Field

[0001] This invention relates to a cable-deployment electric submersible pump system, and in particular to a method for retrieving a device and unit that allows the power supply system of a downhole motor to pass through the well. Background Technology

[0002] Existing technology has proposed a cable-launched EV pump retrieval system, which uses a cable winch to lower the cable from the tubing to the downhole suspension position; when retrieving the EV pump unit, the cable winch is used to pull the cable back up to pull the EV pump unit out. This cable-launched EV pump retrieval system eliminates the need for tubing for both lowering and retrieving the EV pump unit, making the operation more convenient and faster.

[0003] In the aforementioned cable-deployed EDG system, during the lowering and raising of the EDG unit, the power cable bears the weight of the EDG unit. Specifically, the power cable connects to the cable bridle, the bridle connects to the rigging device, and the rigging device connects to the EDG unit. When the unit is operating, the power cable supplies power to the EDG unit's motor via a small flat cable connected to the rigging device. The EDG unit's motor is connected to the small flat cable, which is then connected to the core wire of the power cable through the rigging device, thus supplying power to the motor. The rigging device itself has a sealing function, but existing rigging devices are generally not used for large loads.

[0004] When the above-mentioned cable-deployed electric submersible pump system needs to be retrievaled for maintenance after a long period of operation, the electric submersible pump unit may get stuck due to scale, wax, metal corrosion, and sand deposition at the bottom of the well. It may be impossible to release the stick by the tension of the cable, that is, the electric submersible pump unit cannot be pulled out by the tension of the cable. Summary of the Invention

[0005] The purpose of this invention is to address the problem that, in existing cable-operated electric submersible pump (ESP) systems, after prolonged operation, the ESP unit may become stuck when it needs to be retrieved for maintenance, and the cable tension alone cannot release the stuck ESP unit. This invention provides a device for traversing the downhole motor power supply system and a method for retrieving the ESP unit.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A downhole motor power supply system crossing device includes a crossing device capable of self-sealing. The crossing device includes a male connector and a female connector at its axial center. The male connector is connected downward to the core wire of a small flat cable via a pin, and the female connector is connected upward to the core wire of a power cable via a pin. The upper end of the male connector is provided with a retrieval head or retrieval neck. The connection between the female connector and the male connector is sealed with a shearing structure, which can limit the female connector and the male connector in opposite directions along the axial direction of the crossing device.

[0008] The downhole motor power supply system crossing device includes a crossing device. This crossing device not only enables the cable to pass through the wellbore in a sealed manner but also serves as the main load-bearing component. Existing crossing devices are generally not used for load bearing and are relatively thin in terms of wall thickness and other features. Therefore, this application requires strengthening the overall load bearing capacity of the crossing device, specifically by reinforcing the outer shells of the female and male connectors. Furthermore, the shearing force of the shearing structure at the connection between the female and male connectors should be greater than the connection force required at the connection point during normal operation. This ensures that the power cable, the bridle, the crossing device, and the submersible pump unit below the crossing device can provide operational load bearing for the submersible pump unit; and that the power cable, the crossing device, the flat cable, and the submersible pump unit can provide operational power to the submersible pump unit.

[0009] The female and male connectors of the retrieval device are plug-in type, enabling power transmission between the power cable and the small flat cable. The retrieval head or retrieval neck can be configured as is, and can be used in conjunction with existing retrieval tools, such as shock absorbers. This solution employs a shearing structure to seal the connection between the female and male connectors of the submersible. This shearing structure ensures a tight seal at the connection and creates a limiting force in the opposite direction to the axial direction of the submersible. When the ESP unit becomes stuck downhole, the male connector and its components connected to the ESP unit cannot move upwards under the upward force of the power cable. Consequently, the shearing structure is broken by the axial shearing force, allowing the female and male connectors to separate at the connection point. This avoids damage to other structures of the submersible. The female connector, now detached from the male connector, is pulled upwards by the power cable. A fishing tool can then be lowered into the well and engaged with the fishing head or neck on the male connector to release the ESP unit, allowing it to be pulled up and removed for maintenance. The entire process does not require a workover rig.

[0010] The aforementioned downhole motor power supply system crossing device is used for cable-deployed electric submersible pump systems. It can simultaneously enable the power cable to support the operation of the electric submersible pump unit and supply power to the electric submersible pump unit while ensuring operational sealing. It also facilitates the unblocking and removal of the electric submersible pump unit for maintenance. Furthermore, the unblocking and removal process of the electric submersible pump unit does not damage the structure of the crossing device. It can be reused simply by replacing the shearing structure, which is beneficial for engineering operations.

[0011] Preferably, the shearing structure is a shearing ring, which includes an outer ring and an inner ring. The outer ring and the inner ring are connected by a plurality of shearing members. The outer ring is used to axially limit the female connector or the male connector of the traverse vehicle, and the inner ring is used to correspondingly axially limit the male connector or the female connector of the traverse vehicle.

[0012] In the above scheme, when the outer ring is used to axially limit the female connector of the spacecraft, the inner ring is used to correspondingly axially limit the male connector of the spacecraft; when the outer ring is used to axially limit the male connector of the spacecraft, the inner ring is used to correspondingly axially limit the female connector of the spacecraft. The above shear ring structure is simple in structure and easy to manufacture. Furthermore, the outer and inner rings have clearly defined functions, and the forces are easy to design and calculate. This facilitates the formation of a limiting force in opposite directions along the axial direction of the spacecraft at the connection between the female and male connectors of the spacecraft. Additionally, the several shear elements between the outer and inner rings are weak points in the shearing process, which is conducive to shear failure.

[0013] Preferably, the connection sleeve is provided at the connection between the female connector and the male connector of the traverse device, with one end of the connection sleeve connected to the female connector or the male connector of the traverse device and the other end limiting the outer ring.

[0014] In this design, when one end of the connecting sleeve is connected to the female connector of the manhole and the other end limits the outer ring, the inner ring limits the male connector of the manhole upwards; when one end of the connecting sleeve is connected to the male connector of the manhole and the other end limits the outer ring, the inner ring limits the female connector of the manhole downwards. The connecting sleeve achieves the limiting setting of the outer ring, avoiding differences in the outer shell thickness and other settings of the male and female connectors of the manhole, ensuring that the load-bearing capacity of the manhole shell is the same, facilitating processing, installation, and load-bearing testing, improving wellbore load-bearing safety, and facilitating installation in confined spaces within the well.

[0015] Preferably, the connecting sleeve includes a connecting cap one and a connecting cap two. The two ends of the connecting cap one are respectively fitted onto the outside of the female connector of the transceiver and the outside of the male connector of the transceiver, and respectively form an axial seal. One end of the connecting cap one is threaded to the female connector or the male connector of the transceiver, and the other end is threaded to the inside of the connecting cap two. The end of the connecting cap two away from the connecting cap one has an inner step facing the connecting cap one. The outer ring is provided between the end face of the connecting cap one and the inner step.

[0016] When using the aforementioned connecting sleeve to insert the female or male connector of the transceiver, the first connecting cap can be connected first, followed by the installation of the shear ring based on the first connecting cap and the outer ring. Finally, the second connecting cap is installed using the inner step of the outer ring and the second connecting cap, achieving axial limiting and fixing. This installation method is convenient, quick, and highly accurate, facilitating rapid replacement of the shear ring. Furthermore, both ends of the first connecting cap can form an axial seal with the outer sides of the female and male transceiver connectors, respectively, ensuring a sealing effect at the connection point of the female and male transceiver connectors.

[0017] Preferably, the outer side of the first outer shell corresponding to the female connector of the traverse device is provided with an upward limiting step, the inner ring is placed on the limiting step, and the connecting cap is threadedly connected to the male connector of the traverse device.

[0018] After the shear ring is destroyed, the outer ring is located between the inner step of the first end face of the connecting cap and the second inner step of the connecting cap. The inner ring sits on the limiting step on the outer side of the first outer shell corresponding to the female connector of the crossing device, and is pulled out of the well together with the female connector of the crossing device. After the shear element is destroyed, it is located on the inner ring or the outer ring. With this arrangement, there will be basically no shear ring residue left in the well during the entire process of the shear ring being destroyed, which can avoid affecting the oil and gas production in the well.

[0019] Preferably, the outer ring, the inner ring, and all the shearing components are integrally formed, resulting in higher stability during the shearing process.

[0020] Preferably, the outer casing of the traverseer is provided with an outer cylinder, and the position of the retrieval head or the retrieval neck is replaced by: the retrieval head or the retrieval neck is located at the upper end of the outer cylinder;

[0021] The upper end of the outer cylinder is connected to the lower end of the upper conversion joint by several shear pins. The upper end of the upper conversion joint is connected to the bridle, and the bridle is connected to the power cable. A salvage cap is sleeved on the inner side of the upper conversion joint. The lower end of the outer cylinder is used to connect to the electric submersible pump unit.

[0022] The upper end of the female connector of the traverseer is fitted with an upper injection tube, and a first positioning ring is provided outside the upper injection tube. The first positioning ring is located above the retrieval cap. After the retrieval cap moves up 3-10mm, it can form an axial limit with the first positioning ring.

[0023] In this design, the retrieval head or retrieval neck is not located on the male connector of the derrick, but rather on the upper end of the outer cylinder. The outer cylinder, located outside the derrick, replaces the derrick in bearing the load. That is, while the derrick still provides power to the ESP unit via the power cable and ensures operational sealing, it does not bear the load of the ESP unit via the power cable. The operational load-bearing function is transferred to the outer cylinder, which comprises the power cable, the bridle, the upper adapter, and the outer cylinder, thus achieving operational load-bearing. In this way, the retrieval device can use a conventional device without reinforcement, making it more versatile. However, conventional retrieval devices typically achieve power through cable cores and pins, and the connection between the cable cores and pins is relatively weak. During the process of raising the power cable and exposing the retrieval head or neck to allow the retrieval tool to be lowered, if the cable core or the connection to the pin breaks, the exact location of the break cannot be determined. This could easily lead to the cable core blocking the vicinity of the retrieval head or neck, preventing the retrieval tool from engaging with it and causing the retrieval operation to fail. The retrieval device's female connector has an upper glue injection sleeve attached to its upper end. This sleeve is used to inject glue to protect the cable cores and pins. A break in the cable cores or the connection to the pins could also cause glue to block the vicinity of the retrieval head or neck. The first positioning ring on the outer side of the upper glue injection sleeve not only serves a positioning function but also acts as a crucial element ensuring the retrieval device, including its shear structure, can withstand force after the shear pin breaks.

[0024] Using the downhole motor power supply system crossing device described in this solution, during operation, the crossing device, including the shearing structure, is not subjected to force. The load is borne by the outer cylinder. Therefore, the shearing force of the shearing structure can be set relatively low, such as less than 1.5 tons. When the electric submersible pump unit gets stuck downhole, under a similar external force to the upward pulling of the power cable, the crossing device and the outer cylinder and below connected to the electric submersible pump unit cannot move upward. Consequently, the shear pin can be broken by the axial shearing force, causing the connection between the outer cylinder and the upper conversion joint to break. The upper conversion joint drives the inner sleeved fishing cap to move upward by 3-10mm, and then forms an axial limit with the first positioning ring on the outer side of the upper injection tube sleeved at the upper end of the crossing device's female connector, realizing the conversion of force. The process of the fishing cap moving upward by 3-10mm can change the magnitude of the force on the power cable. This allows the shearing structure of the traverse device to be subjected to a smaller axial force, which causes it to break. This allows the female and male connectors of the traverse device to separate at the connection point. Because the shearing structure is broken by a smaller force, it represents a weak point in the traverse device's tensile strength, thus avoiding damage to other structures, such as the cable core and its connection to the pin. The female connector, detached from the male connector, is then pulled upwards into the well via the power cable. This prevents the cable core or adhesive from blocking the vicinity of the retrieval head or neck. Afterwards, the retrieval tool can be smoothly deployed to engage with the retrieval head or neck on the outer cylinder to release the ESP unit, allowing it to be lifted and removed for maintenance. The entire process does not require a workover rig.

[0025] Preferably, the lower end of the male connector of the submersible is sealed with a lower sealing cylinder and a lower injection cylinder. The lower injection cylinder is located inside the lower sealing cylinder. The lower sealing cylinder is sleeved on the lower end of the outer cylinder. The lower end of the lower sealing cylinder is sleeved with a lower conversion connector. The small flat cable passes through the lower conversion connector, the lower sealing cylinder and the lower injection cylinder in sequence and is connected to the lower end of the male connector of the submersible. The lower end of the lower conversion connector is connected to the electric submersible pump unit.

[0026] The lower end of the male connector of the drilling rig is sealed with a lower injection sleeve, which is used for grouting protection of the cable core and pins inside the male connector. When installing the lower sealing sleeve, a lower adapter is needed to connect the ESP unit; that is, the working load is achieved through the outer cylinder, lower sealing sleeve, and lower adapter. Furthermore, the liquid pumped from the bottom of the well by the ESP must be separated from the bottom well liquid; otherwise, the liquid at the pump outlet will flow back to the bottom of the well, reducing pump efficiency. The channel where the small flat cable is located is connected to the bottom well liquid. The lower sealing sleeve prevents the liquid at the pump outlet from entering the channel where the small flat cable is located, thus preventing the liquid at the pump outlet from flowing back to the bottom of the well. In other words, by installing a lower sealing sleeve at the lower end of the drilling rig, backflow of the pump outlet liquid can be prevented.

[0027] A method for retrieving an electric submersible pump unit, wherein the electric submersible pump unit is connected to a downhole motor power supply system crossing device without an outer cylinder as described above, and the method for retrieving the electric submersible pump unit includes the following steps:

[0028] S1. Raise the power cable to break the shear structure, and then pull the female connector of the through-hole out of the well;

[0029] S2. Lower the retrieval tool so that it engages with the retrieval head or retrieval neck, and use the retrieval tool to release the stuck part at the bottom of the well;

[0030] S3. Lift up the salvage tool and remove the electric submersible pump unit.

[0031] Using the above-described method for retrieving the electric submersible pump unit, when the unit becomes stuck downhole, the female connector of the haulage device can be pulled out of the well by raising the power cable, exposing the retrieval head or retrieval neck on the male connector. The haulage device can then be unstuck and retrieved using a retrieval tool. The entire process can be completed without the need for a workover rig, making the haulage device easy and quick to operate. Furthermore, the female and male connectors can be separated at the connection point, avoiding damage to other structures of the haulage device. It can be reused simply by replacing the shearing structure, which is beneficial for engineering operations.

[0032] A method for retrieving an electric submersible pump unit, wherein the electric submersible pump unit is connected to the aforementioned downhole motor power supply system crossing device with an outer cylinder, and the method for retrieving the electric submersible pump unit includes the following steps:

[0033] S01. First, lift the power cable to cut all the shear pins; then continue to lift the power cable so that the salvage cap moves up and forms an axial limit with the first positioning ring, and the shearing structure is subjected to force.

[0034] S02. Raise the power cable to break the shear structure and separate the female connector and male connector of the drilling rig; then raise the power cable to bring the female connector of the drilling rig out of the well.

[0035] S03. Lower the retrieval tool so that the retrieval tool can be engaged with the retrieval head or retrieval neck, and the retrieval tool can be used to release the stuck part at the bottom of the well.

[0036] S04. Lift up the salvage tool and remove the electric submersible pump unit.

[0037] Using the above-described method for retrieving the electric submersible pump unit, when the unit becomes stuck downhole, before lifting the power cable, the hauler, including the shear structure, is not under stress, while the outer cylinder and shear pins are. Lifting the power cable causes all shear pins to be sheared. Continuing to lift the power cable causes the retrieval cap to move upwards and form an axial limit with the first positioning ring. The shear structure and the hauler then experience stress, resulting in a stress conversion. The tension in the lifting power cable reaches the shear force threshold of the shear structure. Continuing to lift the power cable will destroy the shear structure, separating the hauler's female and male connectors. Retrieving the hauler's female connector from the well avoids damage to the cable core and its connector. At the needle connection point, once the female connector of the scouter, detached from the male connector, is pulled upwards into the well by the power cable, it avoids the cable core or adhesive from blocking the area near the retrieval head or retrieval neck. This completely exposes the retrieval head or retrieval neck on the outer cylinder, allowing the ESP unit to be unjammed and retrieved using a retrieval tool. The entire process eliminates the need for a workover rig, enabling the ESP unit to be removed and repaired quickly and easily. Furthermore, the scouter female connector and the scouter male connector can be separated at the connection point, preventing damage to other structures of the scouter. It can be reused simply by replacing the shearing structure, which is beneficial for engineering operations.

[0038] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0039] 1. The downhole motor power supply system crossing device of the present invention is used in the cable-deployed electric submersible pump system. It can not only simultaneously realize the operation of the power cable to the electric submersible pump unit and the operation of the power cable to the electric submersible pump unit and achieve operation sealing, but also facilitate the unblocking and removal of the electric submersible pump unit for maintenance. Moreover, the unblocking and removal process of the electric submersible pump unit will not damage the structure of the crossing device. It can be reused by simply replacing the shearing structure, which is beneficial to engineering operations.

[0040] 2. The shear ring structure of the downhole motor power supply system crossing device of this invention is simple in structure and easy to manufacture. The outer and inner rings have clearly defined functions, and the forces are easy to design and calculate. This facilitates the formation of a limiting force in opposite directions along the axis of the crossing device at the connection between the female and male connectors. Furthermore, several shear elements between the outer and inner rings are weak points in the shearing process, promoting shear failure. The connecting sleeve, composed of connecting cap one and connecting cap two, allows for convenient, quick, and precise installation, facilitating rapid replacement of the shear ring. With the inner ring resting on the female connector of the crossing device, virtually no shear ring residue remains in the well during the entire shear ring failure process, preventing any impact on well oil and gas production.

[0041] 3. The downhole motor power supply system of this invention uses an outer cylinder for operational load bearing. The drilling rig does not bear any load during operation, so a conventional drilling rig can be used without reinforcement. This also allows for a smaller shear force on the shear structure, which is a weak point in the drilling rig's tensile strength. Therefore, it avoids damage to other structures of the drilling rig, such as the cable core and its connection with the pin. The female connector of the drilling rig, detached from the male connector, is pulled upwards into the well by the power cable. This avoids the cable core or adhesive blocking the area near the retrieval head or retrieval neck. Afterwards, the retrieval tool can be smoothly lowered and engaged with the retrieval head or retrieval neck on the outer cylinder to unblock the ESP unit, allowing it to be lifted and removed for maintenance. The entire process does not require a workover rig.

[0042] 4. The method for removing an electric submersible pump unit according to the present invention can remove and repair the electric submersible pump unit without the need for a workover rig. The operation is convenient and quick. Furthermore, the female connector and the male connector of the scooter can be separated at the connection point, which can avoid damage to other structures of the scooter. It can be reused by simply replacing the shearing structure, which is beneficial to engineering operations. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the underground motor power supply system crossing device described in this invention; Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle; Figure 3 yes Figure 1 A magnified view of a portion of point B in the middle; Figure 4 yes Figure 3 A magnified view of the area within the middle circle; Figure 5 yes Figure 1 A magnified view of a portion of point C in the middle; Figure 6 This is a schematic diagram of the shear ring structure; Figure 7 This is an axial schematic diagram of the shear ring; Figure 8 yes Figure 7 Sectional view at FF; Figure 9 This is a schematic diagram showing the state of the female connector of the timer being removed; Figure 10 yes Figure 9 A magnified view of a portion of point D in the middle; Figure 11 yes Figure 10 A magnified view of the area circled in the diagram; Figure 12 yes Figure 9 A magnified view of a portion of point E in the middle.

[0044] Icons: 1-Power cable; 2-Horse bridle; 3-Upper adapter; 4-Cable core; 5-Shear pin; 61-Upper glue cartridge; 62-Lower glue cartridge; 7-First positioning ring; 8-Retrieval cap; 9-Pin; 10-Retrieval head; 11-Dragout female connector; 111-First outer shell; 12-Dragout male connector; 121-Second outer shell; 13-Connecting cap one; 14-Connecting cap two; 15-Shear ring; 151-Outer ring; 152-Inner ring; 153-Shearing component; 154-Limiting step; 16-Outer cylinder; 17-First O-ring seal; 18-Second positioning ring; 19-First nut; 20-Third positioning ring; 21-Second nut; 22-Lower sealing cylinder; 23-Second O-ring seal; 24-Lower adapter; 25-Small flat cable. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings.

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0047] Example 1

[0048] A device for traversing a downhole motor power supply system, see [link / reference] Figure 1-12 The system includes a self-sealing device. The axial center of the device includes a male connector 12 and a female connector 11. The male connector 12 is connected downward to the cable core 4 of the small flat cable 25 via a pin 9. The female connector 11 is connected upward to the cable core 4 of the power cable 1 via a pin 9. The connection between the female connector 11 and the male connector 12 is sealed with a shearing structure. The shearing structure can limit the female connector 11 and the male connector 12 in opposite directions along the axial direction of the device.

[0049] The outer casing of the traverseer is provided with an outer cylinder 16, and the upper end of the outer cylinder 16 is provided with the retrieval head 10 or the retrieval neck;

[0050] The upper end of the outer cylinder 16 is connected to the lower end of the upper conversion connector 3 by several shear pins 5. The upper end of the upper conversion connector 3 is connected to the bridle 2. The bridle 2 is connected to the power cable 1. A salvage cap 8 is sleeved on the inner side of the upper conversion connector 3. The lower end of the outer cylinder 16 is used to connect to the electric submersible pump unit.

[0051] The upper end of the female connector 11 of the traverseer is fitted with an upper glue injection tube 61. The upper glue injection tube 61 is provided with a first positioning ring 7. The first positioning ring 7 is located above the retrieval cap 8. After the retrieval cap 8 moves up 3-10mm, it can form an axial limit with the first positioning ring 7.

[0052] In this design, the downhole motor mainly refers to the motor of the electric submersible pump unit lowered into the well. The retrieval head 10 or the retrieval neck is located at the upper end of the outer cylinder 16, such as... Figure 2 As shown. The location of the retrieval neck: First, considering the inner diameter of the tubing, an internal retrieval method is used; second, the retrieval tool and the retrieval neck must engage; third, the retrieval tool must be able to reach the retrieval neck, and the size of the retrieval neck must match the retrieval tool. The outer cylinder 16 is located outside the derrick and replaces the derrick in bearing the load. That is, the derrick still provides power to the EV pump unit via the power cable and provides operational sealing, but it is not used to provide operational load to the EV pump unit via the power cable, such as... Figure 2-5 As shown, the operational load-bearing function is transferred to the outer cylinder 16, namely the power cable, the bridle 2, the upper adapter 3, and the outer cylinder, thus achieving operational load-bearing. In this way, the rig can use a conventional rig without reinforcement, making it more versatile. However, conventional rigs typically achieve power transmission internally through cable cores and pins, such as... Figure 2-3 As shown, the upper and lower ends of the female connector 11 and the male connector 12 of the retrieval device are connected to the corresponding cable cores 4 via pins, and then connected to the small flat cable 25 or the power cable 1 via the bridle 2. The connection between the cable cores 4 and the pins is relatively weak. In the process of raising the power cable and exposing the retrieval head 10 or retrieval neck so that the retrieval tool can be lowered, if the cable cores 4 and the connection with the pins break, since it is impossible to determine where the cable cores 4 broke, the cable cores 4 may block the area near the retrieval head or retrieval neck, which will prevent the retrieval tool from engaging with the retrieval head or retrieval neck, causing the retrieval tool to be lowered and the retrieval operation to fail. The upper end of the female connector 11 of the retrieval device is fitted with an upper glue injection tube 61, and the lower end of the male connector 12 of the retrieval device is fitted with a lower glue injection tube. The upper glue injection tube 61 and the lower glue injection tube are used to inject glue to protect the corresponding cable core wire 4 and the pin, respectively. If the cable core wire 4 and the connection with the pin are broken, the glue may block the area near the retrieval head or retrieval neck. In addition, the first positioning ring 7 on the outer side of the upper glue injection tube 61 not only serves as an installation and positioning function, but also serves as a key to the retrieval device, including the shear structure, being able to bear the force after the shear pin 5 breaks, thus realizing the force transfer.

[0053] When using the downhole motor power supply system crossing device described in this solution, the crossing device, including the shear ring 15, is not under stress during operation. The load is borne by the outer cylinder 16. Therefore, the shear force of the shear structure can be set to be relatively small, such as less than 1.5 tons. Considering the size of the radial space inside the well, the shear force required is relatively small, and the shear structure can be set accordingly. When the electric submersible pump unit gets stuck downhole, under a similar external force to the upward lifting of the power cable, the crossing device and the outer cylinder 16 and below connected to the electric submersible pump unit cannot move upward. Consequently, the shear pin 5 can be broken by the axial shear force, causing the connection between the outer cylinder 16 and the upper conversion joint 3 to break. The shear force of the shear pin is about 8-12 tons. After the shear pin 5 is disconnected, the upper adapter 3 causes the inner sleeved retrieval cap 8 to move upward by 3-10mm, forming an axial limit with the first positioning ring 7 on the outer side of the upper injection sleeve 61 sleeved on the upper end of the traverse device female connector 11, realizing the conversion of force. The process of the retrieval cap 8 moving upward by 3-10mm can change the magnitude of the force on the power cable, so that the traverse device, including the shear structure, begins to be subjected to a smaller axial force. The shear structure is damaged by a smaller axial shear force, thereby allowing the traverse device female connector 11 and the traverse device male connector 12 to separate at the connection point. Because the force that damages the shear structure is small, it is a weak point of tension on the traverse device, thus avoiding damage to other structures of the traverse device, such as avoiding damage to the cable core wire 4 and its connection with the pin. The traverse device female connector 11, which is separated from the traverse device male connector 12, will be pulled upward into the well by the power cable. Figure 9 As shown, this avoids the cable core 4 or adhesive from blocking the area near the retrieval head or retrieval neck. Then, the retrieval tool can be smoothly lowered and engaged with the retrieval head 10 or retrieval neck on the outer cylinder 16 to release the ESP unit, allowing it to be lifted and removed for maintenance. The entire process does not require a workover rig. The power cable core 4 is made of copper with a high elongation rate, so it is generally not broken under low stress. The male connector 12 of the retrieval device is directly inserted into the female connector 11 via a pin, and can be easily pulled out. This ensures that the retrieval cap 8 does not damage the power cable core 4 when it moves upward. Even if the power cable core 4 breaks, the break is internal and does not affect the female connector 11's disengagement from the male connector 12, as the connection between the female connector 11 and the male connector 12 remains weak and will not block the area near the retrieval head or retrieval neck.

[0054] The following provides further optimizations and limitations to the downhole motor power supply system crossing device in this embodiment.

[0055] from Figure 1 As can be seen, this embodiment divides the underground motor power supply system crossing device into three parts, A, B and C, from top to bottom. Figure 2Showing section A at the top, it can be seen that the power cable 1 connects to the bridle 2, thus achieving both the load-bearing connection between the power cable 1 and the bridle 2, and the transition of the power cable 1 to the cable core 4. The bridle 2 is connected to the outer cylinder 16 via an upper adapter 3. Specifically, the upper end of the outer cylinder 16 is connected to the lower end of the upper adapter 3 via several shear pins 5. The outer cylinder 16 and the upper adapter 3 form a hollow structure, and the hollow structure contains a through-wire. From... Figure 2-3 As can be seen, the axial middle part of the traverse device includes a male connector 12 and a female connector 11. The lower end of the male connector 12 is fitted with a lower injection tube 62, and the upper end of the female connector 11 is fitted with an upper injection tube 61. The upper cable core 4 passes through the upper adapter 3 and the upper injection tube 61 in sequence and is connected to the female connector 11 through the pin 9. One end of the lower cable core 4 passes through the lower injection tube 62 and is connected to the male connector 12 through the pin 9, and the other end is connected to the small flat cable 25. The upper end of the upper glue injection tube 61 is threaded with a first positioning ring 7 on the outer side, and the lower end of the upper conversion connector 3 is threaded with a retrieval cap 8. The retrieval cap 8 is located a certain distance below the first positioning ring 7. After rising a certain distance, it abuts against the lower end of the first positioning ring 7. If it rises 3-10mm, the retrieval cap 8 can change the magnitude of the force on the power cable during the process of moving upward 3-10mm. Alternatively, the first positioning ring 7 is set to be an outer cone shape, and the inner wall of the retrieval cap 8 can climb along the outer cone shape of the first positioning ring 7. After climbing to a certain extent, it forms an axial constraint.

[0056] Among them, from Figure 4 As can be seen, the inner core end face of the female connector 11 of the transceiver protrudes beyond the end face of its first outer shell 111, while the end face of the second outer shell 121 of the male connector 12 of the transceiver protrudes beyond the end face of its inner core, so that the male connector 12 and the female connector 11 of the transceiver can be plugged in and mated, and the inner core of the female connector 11 and the inner core of the male connector 12 of the transceiver can contact each other to achieve power supply.

[0057] In this embodiment, the shear structure can adopt various force-bearing structures, but it needs to meet the axial limiting form and the shear structure setting point needs to be sealed. This embodiment preferably adopts a shear ring 15 structure, and the shear ring 15 sleeved at the connection between the female connector 11 and the male connector 12 of the transceiver has been optimized. The schematic diagram of the shear ring 15 is shown below. Figure 4 and Figure 6-8As shown, the shearing ring 15 includes an outer ring 151 and an inner ring 152, which are connected by a plurality of shearing members 153. The outer ring 151, the inner ring 152, and all the shearing members 153 are preferably integrally formed components, resulting in higher stability during the shearing process. In this embodiment, the end faces of the arc-shaped ends of the shearing members 153 are relatively concave arc-shaped structures, which facilitates processing and reduces stress concentration, thus promoting uniform force distribution during shearing. The thickness of the outer ring 151, the inner ring 152, and all the shearing members 153 mainly meets the requirements for shearing force setting, i.e., the size of the shearing area. Furthermore, the shearing area of ​​the shearing members 153 is achieved by locally removing material in a circumferential direction, forming intervals, resulting in a small material area and a small shearing surface of the shearing members 153. This allows the shearing force to be set to a smaller value; otherwise, the shearing force of the shearing ring 15 would be too large. Figure 4 As shown, the outer ring 151 is used to axially limit the female connector 11 or the male connector 12 of the traverse vehicle, and the inner ring 152 is used to correspondingly axially limit the male connector 12 or the female connector 11 of the traverse vehicle. That is, in this embodiment, when the outer ring 151 is used to axially limit the female connector 11 of the traverse vehicle, the inner ring 152 is used to correspondingly axially limit the male connector 12 of the traverse vehicle; when the outer ring 151 is used to axially limit the male connector 12 of the traverse vehicle, the inner ring 152 is used to correspondingly axially limit the female connector 11 of the traverse vehicle. Using the above-mentioned shear ring structure, the structure is simple and easy to process. Furthermore, the outer ring 151 and the inner ring 152 have clearly defined functions, and the force is easy to design and calculate. This facilitates the formation of a limiting force in opposite directions along the axial direction of the traverse vehicle at the connection between the female connector 11 and the male connector 12 of the traverse vehicle. Additionally, the several shear members 153 between the outer ring 151 and the inner ring 152 are weak points in the shearing process, which is conducive to shear failure.

[0058] In addition, this embodiment also provides a connecting sleeve at the connection between the female connector 11 and the male connector 12 of the traverse device, and the two ends of the connecting cap 13 can respectively form an axial seal with the outer side of the female connector 11 and the outer side of the male connector 12 of the traverse device, ensuring the sealing effect at the connection between the female connector and the male connector. One end of the connecting sleeve is connected to the female connector 11 or the male connector 12 of the traverse device, and the other end limits the outer ring 151. That is, when one end of the connecting sleeve is connected to the female connector 11 of the traverse device and the other end limits the outer ring 151, the inner ring 152 limits the male connector 12 of the traverse device upward; when one end of the connecting sleeve is connected to the male connector 12 of the traverse device and the other end limits the outer ring 151, the inner ring 152 limits the female connector 11 of the traverse device downward.

[0059] The connecting sleeve described in this embodiment includes a first connecting cap 13 and a second connecting cap 14. One end of the first connecting cap 13 is threaded to the female connector 11 or the male connector 12 of the transceiver, and the other end is threaded to the inner side of the second connecting cap 14. The end of the second connecting cap 14 away from the first connecting cap 13 has an inner step facing the first connecting cap 13. The outer ring 151 is located between the end face of the first connecting cap 13 and the inner step. When inserting the female connector 11 or the male connector 12 of the transceiver, the first connecting cap 13 can be connected first, and then the shear ring can be installed according to the first connecting cap 13 and the outer ring 151. Finally, the second connecting cap 14 can be installed through the outer ring 151 and the inner step of the second connecting cap 14 to achieve axial limiting and fixing. This installation method is convenient, quick, and accurate, and is conducive to the rapid replacement of the shear ring.

[0060] like Figure 4 and Figure 11 As shown, the outer side of the first outer shell 111 corresponding to the female connector 11 of the transceiver is provided with an upward limiting step 154. The inner ring 152 sits on the limiting step 154. One end of the connecting cap 13 is threaded to the male connector 12 of the transceiver, and the inner side of the connecting cap 13 has a first O-ring seal 17 that cooperates with the first outer shell 111 and the second outer shell 121 to achieve a seal, which can seal the mating point of the first outer shell 111 and the second outer shell 121. The other end of the connecting cap 13 is threaded to the inner side of the connecting cap 14. The end of the connecting cap 14 away from the connecting cap 13 has an inner step facing the connecting cap 13. The outer ring 151 is located between the end face of the connecting cap 13 and the inner step. Figure 11 As shown, after the shear ring is destroyed, the outer ring 151 is located between the end face of the first connecting cap 13 and the inner step of the second connecting cap 14. The inner ring 152 sits on the limiting step 154 ​​on the outer side of the first outer shell 111 corresponding to the female connector 11 of the crossing device, and is pulled out of the well together with the female connector 11 of the crossing device. After the shear member 153 is destroyed, it is located on the inner ring 152 or the outer ring 151. With this arrangement, there will be basically no shear ring residue left in the well during the entire process of the shear ring being destroyed, which can avoid affecting the oil and gas production in the well.

[0061] like Figure 3 and 5As shown, in this embodiment, a lower sealing cylinder 22 is also sealed and connected to the lower end of the male connector 12 of the traverse device. Specifically, a second positioning ring 18 is externally threaded onto the male connector 12 of the traverse device, and a first nut 19 is sleeved on the outside of the second positioning ring 18. The upper end of the first nut 19 is threaded to the outside of the male connector 12 of the traverse device and abuts against the upper end of the second positioning ring 18. The lower end of the first nut 19 is threaded to the outside of the lower sealing cylinder 22. The connection between the lower sealing cylinder 22 and the male connector 12 of the traverse device allows the traverse device to be fixed on the lower sealing cylinder 22. The lower sealing cylinder 22 is sleeved on the outside of the lower injection cylinder 62, and the lower sealing cylinder 22 is sleeved on the lower end of the outer cylinder 16. The connection between the lower sealing cylinder 22 and the outer cylinder 16 completes the main force transmission between the upper and lower parts during normal operation. Specifically, a third positioning ring 20 is threaded onto the outer side of the lower sealing cylinder 22. The upper end of the third positioning ring 20 abuts against the lower end of the outer cylinder 16. A second nut 21 is fitted onto the outer side of the third positioning ring 20. The upper end of the second nut 21 is threaded to the lower end of the outer cylinder 16, and the lower end is threaded to the outer side of the lower sealing cylinder 22 and abuts against the lower end of the third positioning ring 20. A lower conversion connector 24 is fitted onto the lower end of the lower sealing cylinder 22, and a sealing connection is achieved through a second O-ring seal 23. The small flat cable passes sequentially through the lower conversion connector 24 and the lower sealing cylinder 22, and is connected to the lower end of the male connector 12 of the transceiver via the corresponding cable core wire 4. The lower end of the lower conversion connector 24 is connected to the electric submersible pump unit.

[0062] Well-crossing devices typically have thin walls and relatively low load-bearing capacity; many are designed solely for power supply. Compared to using a well-crossing device for both power supply and load-bearing, which relies on an outer cylinder for load-bearing, the well-crossing device used for power supply in this embodiment offers several advantages: First, it eliminates the need to modify the device's structure and dimensions, allowing the direct use of conventional devices and enhancing its versatility; second, the device does not bear load, which is beneficial to its structure; and third, the outer cylinder accommodates the retrieval head 10 and retrieval diameter without altering the device's overall structure.

[0063] Example 2

[0064] This embodiment provides a downhole motor power supply system crossing device, which, compared with embodiment 1, mainly differs in that it does not include an outer cylinder and related structures, such as the outer cylinder 16, shear pin 5, and a movable distance between the first positioning ring 7 and the retrieval cap 8; the retrieval cap 8, the first positioning ring 7, and related connecting structures may not be included; and the retrieval head 10 or retrieval neck is located at the upper end of the male connector 12 of the crossing device.

[0065] Specifically, it includes a self-sealing device. The axial center of the device includes a male connector 12 and a female connector 11. The male connector 12 is connected downward to the core wire 4 of the small flat cable 25 via a lower pin 9. The female connector 11 is connected upward to the core wire 4 of the power cable 1 via an upper pin 9. The upper end of the male connector 12 is provided with a retrieval head 10 or a retrieval neck. A shearing ring 15 is fitted at the connection between the female connector 11 and the male connector 12. It can also be a shearing structure of other shapes, as long as the force is the same as that of the shearing ring, and it can achieve axial force limitation and seal the shearing structure setting. The shearing ring 15 can limit the female connector 11 and the male connector 12 in opposite directions along the axial direction of the device.

[0066] The downhole motor power supply system crossing device includes a crossing device. This crossing device not only enables the cable to pass through the well bottom in a sealed manner but also serves as the main load-bearing component. Therefore, the overall load-bearing capacity of the crossing device needs to be strengthened. Strengthening methods can include increasing the wall thickness according to existing designs, which is achievable with existing technology. For example, strengthening the outer shell of the female connector 11 and the male connector 12 of the crossing device. Furthermore, the shearing force of the shearing ring 15 fitted at the connection between the female connector 11 and the male connector 12 should be greater than the connection force required at the connection point during normal operation. This differs from the shearing ring in Embodiment 1, but the structure and shape of the shearing ring, as well as the structure and shape of the connecting sleeve, can be the same as in Embodiment 1. This allows for the operation and load-bearing of the electric submersible pump unit through the power cable, the bridle, the crossing device, and the electric submersible pump unit below the crossing device; and for the operation and power supply of the electric submersible pump unit through the power cable, the crossing device, the small flat cable, and the electric submersible pump unit.

[0067] The female connector 11 and the male connector 12 of the retrieval device are connected by a plug-in method, which enables power transmission between the power cable and the small flat cable. The retrieval head 10 or retrieval neck can be configured in an existing way to work with existing retrieval tools, such as shock absorbers. This solution involves installing a shear ring 15 at the connection between the female connector 11 and the male connector 12 of the submersible. This creates a limiting force in the opposite direction to the axial direction of the submersible at the connection. When the ESP unit becomes stuck downhole, under a similar external force of pulling the power cable upward, the male connector 12 and the portion below it connected to the ESP unit cannot move upward. Consequently, the shear ring can be broken by the axial shear force, allowing the female connector 11 and the male connector 12 to separate at the connection. This avoids damage to other structures of the submersible. The female connector 11, detached from the male connector 12, can be pulled upward into the well by the power cable. Then, a retrieval tool can be lowered and engaged with the retrieval head 10 or retrieval neck on the male connector 12 to release the ESP unit, allowing it to be pulled up and removed for maintenance. The entire process does not require a workover rig.

[0068] The downhole motor power supply system crossing device described in this embodiment is used for cable-launched electric submersible pump systems. It can simultaneously enable the power cable to support the operation of the electric submersible pump unit and supply power to the electric submersible pump unit while ensuring operational sealing. It also facilitates the unblocking and removal of the electric submersible pump unit for maintenance. Furthermore, the unblocking and removal process of the electric submersible pump unit does not damage the structure of the crossing device. It can be reused simply by replacing the shear ring, which is beneficial for engineering operations.

[0069] Example 3

[0070] This embodiment provides a method for retrieving an electric submersible pump unit. The electric submersible pump unit is connected to the downhole motor power supply system crossing device as described in Embodiment 2. The method for retrieving the electric submersible pump unit includes the following steps:

[0071] S1. Raise the power cable 1 to destroy the shear structure. In this embodiment, a preferred shear ring 15 can be used. After the shear ring 15 is destroyed, continue to raise the power cable 1 to separate the male connector 12 and the female connector 11 of the tunnel. Then, continue to raise the power cable 1 to bring the female connector 11 of the tunnel out of the well.

[0072] S2. Lower the retrieval tool so that it engages with the retrieval head 10 or retrieval neck, and use the retrieval tool to release the stuck device at the bottom of the well. The retrieval tool can be a cable or steel wire, etc., and the retrieval tool can be a shocker, which continuously shocks until the electric submersible pump unit suspended at the bottom of the well is released.

[0073] S3. Lift up the salvage tool and remove the electric submersible pump unit.

[0074] Using the above-described method for retrieving the electric submersible pump unit, when the unit becomes stuck downhole, the female connector 11 of the haulage device can be pulled out of the well by raising the power cable 1, exposing the retrieval head 10 or retrieval neck on the male connector 12. The haulage device can then be unstuck and retrieved using a retrieval tool. The entire process can be completed without the need for a workover rig, making the haulage and maintenance of the unit convenient and quick. Furthermore, the female connector 11 and the male connector 12 can be separated at the connection point, avoiding damage to other structures of the haulage device. It can be reused simply by replacing the shear ring, which is beneficial for engineering operations.

[0075] Example 4

[0076] This embodiment provides a method for retrieving an electric submersible pump unit. The electric submersible pump unit is connected to the downhole motor power supply system crossing device as described in Embodiment 1. The method for retrieving the electric submersible pump unit includes the following steps:

[0077] S01. First, lift the power cable 1 so that all the shear pins 5 are cut; then continue to lift the power cable 1 so that the salvage cap 8 moves up and forms an axial limit with the first positioning ring 7, and the shear ring 15 is subjected to force.

[0078] S02. Lift the power cable 1 to break the shear structure. In this embodiment, a preferred shear ring 15 can be used to separate the female connector 11 and the male connector 12 of the tunneling device. In this step, the force required to lift the power cable 1 and break the shear ring 15 is less than in step S01, with the main goal of breaking the shear ring. The force required to break the shear ring can be less than 1.5 tons. Then, lift the power cable 1 to bring the female connector 11 out of the well. The force required to lift the power cable 1 is mainly sufficient to bring it out of the well.

[0079] S03. Lower the retrieval tool so that it engages with the retrieval head 10 or the retrieval neck, and use the retrieval tool to release the stuck material at the bottom of the well; the lowered retrieval tool can be the same as that in Example 3;

[0080] S04. Lift up the salvage tool and remove the electric submersible pump unit.

[0081] Using the extraction method for the electric submersible pump unit described in this embodiment, when the electric submersible pump unit becomes stuck downhole, before lifting the power cable 1, the hauler, including the shear ring, is not under stress, while the outer cylinder and shear pins are under stress. Lifting the power cable 1 causes all shear pins 5 to be sheared. Continuing to lift the power cable 1 causes the retrieval cap 8 to move upward and form an axial limit with the first positioning ring 7. The shear ring 15 and the hauler are then under stress, and the stress transfer occurs. The tension of the lifting power cable 1 reaches the shear force threshold of the shear ring. Continuing to lift the power cable 1 will destroy the shear ring 15, separating the hauler's female connector 11 and male connector 12. Pulling the hauler's female connector 11 out of the well avoids damage to the cable core 4. When the female connector 11 of the scouter, detached from the male connector 12, is pulled upwards into the well by the power cable, it avoids the cable core wire 4 or adhesive from blocking the area near the scouter head or scouter neck. This completely exposes the scouter head 10 or scouter neck on the outer cylinder, allowing the electric submersible pump unit to be unjammed and retrieved using a scouring tool. The entire process can be completed without the need for a workover rig, making the operation convenient and quick. Furthermore, the female connector 11 and the male connector 12 of the scouter can be separated at the connection point, avoiding damage to other structures of the scouter. It can be reused simply by replacing the shear ring, which is beneficial for engineering operations.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for traversing a downhole motor power supply system, comprising a traversing device capable of self-sealing, characterized in that, The axial middle part of the traverse device includes a male connector (12) and a female connector (11). The male connector (12) is connected downward to the cable core (4) of the small flat cable (25) through a pin (9). The female connector (11) is connected upward to the cable core (4) of the power cable (1) through a pin (9). The upper end of the male connector (12) is provided with a retrieval head (10) or a retrieval neck. The connection between the female connector (11) and the male connector (12) is sealed with a shearing structure. The shearing structure can limit the female connector (11) and the male connector (12) in opposite directions along the axial direction of the traverse device. The shearing structure is a shearing ring (15), which includes an outer ring (151) and an inner ring (152). The outer ring (151) and the inner ring (152) are connected by a number of shearing members (153). The outer ring (151) is used to axially limit the female connector (11) or the male connector (12) of the traverseer, and the inner ring (152) is used to correspondingly axially limit the male connector (12) or the female connector (11) of the traverseer. A connecting sleeve is provided at the connection between the female connector (11) and the male connector (12) of the traverse device. One end of the connecting sleeve is connected to the female connector (11) or the male connector (12) of the traverse device, and the other end limits the outer ring (151). The connecting sleeve includes a first connecting cap (13) and a second connecting cap (14). The two ends of the first connecting cap (13) are respectively fitted on the outside of the female connector (11) and the male connector (12) of the transceiver and form axial seals respectively. One end of the first connecting cap (13) is threaded to the female connector (11) or the male connector (12) of the transceiver, and the other end is threaded to the inside of the second connecting cap (14). The end of the second connecting cap (14) away from the first connecting cap (13) has an inner step facing the first connecting cap (13). The outer ring (151) is provided between the end face of the first connecting cap (13) and the inner step. The outer side of the first outer shell (111) corresponding to the female connector (11) of the traverseer is provided with an upward limiting step (154), the inner ring (152) is placed on the limiting step (154), and the connecting cap (13) is threaded to the male connector (12) of the traverseer.

2. The underground motor power supply system crossing device according to claim 1, characterized in that, The outer ring (151), the inner ring (152), and all the shear members (153) are integrally formed components.

3. The downhole motor power supply system crossing device according to any one of claims 1-2, characterized in that, The outer casing of the traverseer is provided with an outer cylinder (16), and the location of the retrieval head (10) or the retrieval neck is replaced by: the retrieval head (10) or the retrieval neck is located at the upper end of the outer cylinder (16); The upper end of the outer cylinder (16) is connected to the lower end of the upper conversion connector (3) by several shear pins (5). The upper end of the upper conversion connector (3) is connected to the bridle (2). The bridle (2) is connected to the power cable (1). The upper conversion connector (3) is fitted with a salvage cap (8) on its inner side. The lower end of the outer cylinder (16) is used to connect to the electric submersible pump unit. The upper end of the female connector (11) of the traverse device is fitted with an upper glue injection tube (61). The upper glue injection tube (61) is provided with a first positioning ring (7). The first positioning ring (7) is located above the salvage cap (8). After the salvage cap (8) moves up 3-10mm, it can form an axial limit with the first positioning ring (7).

4. The underground motor power supply system crossing device according to claim 3, characterized in that, The lower end of the male connector (12) of the transceiver is sealed with a lower sealing cylinder (22) and a lower injection cylinder (62). The lower injection cylinder (62) is located inside the lower sealing cylinder (22). The lower sealing cylinder (22) is sleeved on the lower end of the outer cylinder (16). The lower end of the lower sealing cylinder (22) is sleeved with a lower conversion connector (24). The small flat cable (25) passes through the lower conversion connector (24) and the lower sealing cylinder (22) in sequence and is connected to the lower end of the male connector (12) of the transceiver through the corresponding cable core wire (4). The lower end of the lower conversion connector (24) is connected to the electric submersible pump unit.

5. A method for removing an electric submersible pump unit, characterized in that, The electric submersible pump unit is connected to the downhole motor power supply system crossing device as described in any one of claims 1-2. The method for retrieving the electric submersible pump unit includes the following steps: S1. Raise the power cable (1) to break the shear structure, and then pull the female connector (11) of the cross-hole out of the well; S2. Lower the retrieval tool so that the retrieval tool can cooperate with the retrieval head (10) or retrieval neck, and the retrieval tool can be used to release the stuck tool at the bottom of the well. S3. Lift up the salvage tool and remove the electric submersible pump unit.

6. A method for removing an electric submersible pump unit, characterized in that, The electric submersible pump unit is connected to the downhole motor power supply system crossing device as described in any one of claims 3-4. The method for retrieving the electric submersible pump unit includes the following steps: S01. First, lift the power cable (1) so that all the shear pins (5) are cut off; then continue to lift the power cable (1) so that the salvage cap (8) moves up and forms an axial limit with the first positioning ring (7), and the shearing structure is subjected to force. S02, lift the power cable (1) to break the shear structure and separate the female connector (11) and male connector (12) of the traverse device; then lift the power cable (1) to bring the female connector (11) out of the well. S03, lower the retrieval tool so that the retrieval tool can cooperate with the retrieval head (10) or retrieval neck, and use the retrieval tool to release the stuck tool at the bottom of the well; S04. Lift up the salvage tool and remove the electric submersible pump unit.

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