Non-contact electric power connector for oil well and application and use method of non-contact electric power connector

Abstract

The invention discloses a non-contact electric power connector for an oil well and application and a use method thereof. The non-contact electric power connector comprises a transmitting end tool and a receiving end tool, the transmitting end tool comprises a first electric control connecting piece and an inner coil assembly which are connected in sequence; and the receiving end tool comprises an outer coil assembly and a second electric control connecting piece which are connected in sequence. The method solves the problems that in a traditional electric control separate mining technology, due to the fact that a traditional cable power supply system cannot continuously supply power due to the well depth, the purpose that a tool is placed in a well for production for a long time cannot be achieved, and meanwhile solves the problems that in traditional pump inspection operation, all pipe column strings need to be pulled out of a next pipe column, pump inspection efficiency is low, system maintainability is poor, and production cost is low. According to the non-contact type electric power connector for the oil well, on the basis of achieving the basic function of accurate measurement and adjustment of a production allocation layer, the efficiency of pump inspection is improved, the cost of system maintenance is reduced, and the maintainability of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole tools for oil extraction, and specifically to a non-contact power connector for oil wells, its application and usage method. Background Art

[0002] At present, the conventional medium-deep well separate production technologies mainly include cable-type and pressure wave-type intelligent electric control separate production technologies. The main bottlenecks of these two technologies are as follows:

[0003] 1. It has relatively high requirements for the stability and reliability of the power supply system. Therefore, the intelligent electric control system will affect the life of the entire system due to problems such as insufficient battery power supply or cable connection quality.

[0004] 2. The intelligent electric control system has low flexibility in adapting to downhole injection and production processes. When downhole equipment fails or a pump inspection and well repair operation requires pulling out all the pipe string, it will result in high maintenance costs, time-consuming and inefficient, and affect production.

[0005] Publication (Announcement) No.: CN110984926A discloses an intelligent control layered oil production completion string system. The inner oil pipe is anchored and seated in the pipe string through an electric control tubing anchor; several groups of electric control expansion packers are arranged at the lower end of the electric control tubing anchor, and the electric control expansion packers are respectively located in the unperforated well sections of the oil layer intervals; an electric control flow control device is connected to each electric control expansion packer, and the number of separated layers of the oil well is the same as the number of the electric control expansion packers; a power and monitoring system is arranged in the electric control tubing anchor, the electric control flow control device and the electric control expansion packer, and the control cable of the power and monitoring system extends upward along the pipe string and is connected to the ground oil well digital transmission control system.

[0006] When equipment failure occurs or a pump inspection and well repair operation requires pulling out all the pipe string in this prior art, it will result in high maintenance costs, time-consuming and inefficient, and affect production.

[0007] Publication (Announcement) Number: CN116335596A discloses an integrated string for stratified testing and oil production in oil wells and a method for stratified testing and oil production, which includes a sucker rod pump, a tubing string, and a single-layer controller. The single-layer controller includes a short pipe body, which consists of an inner pipe and an outer pipe arranged coaxially, and an annular cavity is formed between the inner pipe and the outer pipe. The inlet of the sucker rod pump is connected to the outlet of the tubing string, and the inlet of the tubing string is connected to the upper port of the inner pipe of the short pipe body. A central controller, an internal pressure sensor, an external pressure sensor, and a flow regulating plug are arranged in the annular cavity. The internal pressure sensor is used to collect the pressure of the oil in the tubing string, and the external pressure sensor is used to collect the pressure in the annular cavity of the short pipe body. The central controller calculates the pressure difference between the pressure in the tubing string and the pressure in the annular cavity, compares the pressure difference with a set range, and adjusts the oil flow in the tubing string through the flow regulating plug according to the comparison result. One string can complete the pressure testing of each layer and realize the separate production function, reducing the number of downhole stratified pressure tests.

[0008] In the prior art, when equipment failures occur or pump inspection and well repair operations are required, the entire pipe string needs to be removed, resulting in high maintenance costs, time-consuming and inefficient operations, and affecting production.

[0009] Publication (Announcement) Number: CN114837622B discloses a two-way communication intelligent measurement and adjustment method and system for water injection / oil production wells based on RFID. In water injection wells, an RFID water distributor is set in each water injection interval. The PC is connected to the RFID ground control system, and the valve opening size of the downhole RFID water distributor and the command information for reading downhole parameters are written into spherical electronic tags. Two spherical electronic tags with relevant command information are successively put into or pumped into the water injection well to adjust the opening of the RFID water distributor valve body, and the spherical electronic tags are washed out by backwashing the well. When the spherical electronic tags pass through the RFID water distributor again, information such as flow rate, pressure, and temperature at the corresponding position is collected. The collected data is analyzed, the opening data of the RFID water distributor valve body is corrected, and adjustment parameter commands for the next adjustment are calculated. The spherical electronic tag is an ellipsoid, and an adjustable counterweight is arranged inside to achieve precise control of the flow rate in water injection / oil production wells, two-way communication between the ground and the downhole, and the smooth recovery of the spherical electronic tags, with simple operation, economy, and high efficiency.

[0010] In the prior art, when equipment failures occur or pump inspection and well repair operations are required, the entire pipe string needs to be removed, resulting in high maintenance costs, time-consuming and inefficient operations, and affecting production.

[0011] In summary, the technical solutions of the above-disclosed technologies involve downhole cable intelligent measurement and control technologies and wireless intelligent measurement and control technologies, both of which do not simultaneously solve the flexibility of the stratified production tubing string in medium-depth oil wells and the durability of stable power supply. The present invention effectively adopts the cable + wireless method to simultaneously solve the above problems. For more technical features, technical problems to be solved, and beneficial effects of the present invention, there is no technical inspiration in the above-disclosed technical documents. Summary of the Invention

[0012] In view of the above-mentioned defects existing in the prior art, the object of the present invention is to provide a non-contact power connector for oil wells, its application and usage method, so as to solve the problems such as short "safe period" of the power supply system and poor system maintainability in the conventional medium-depth electric control separate production technology in the background technology, to ensure production, reduce the construction cost of pump inspection and well repair, and improve the pump inspection efficiency.

[0013] To achieve the above object, the present invention adopts the following technical solutions:

[0014] A non-contact power connector for oil wells includes a transmitting end tool and a receiving end tool; the transmitting end tool includes a first electric control connecting piece and an inner coil assembly connected in sequence; the receiving end tool includes an outer coil assembly and a second electric control connecting piece connected in sequence.

[0015] Further, the inner coil assembly includes a first outer tube, a first inner tube, and a guiding head;

[0016] Specifically, five coils are sequentially arranged on the outer wall of the first inner tube from top to bottom, which are divided into a first inner coil, a second inner coil, a third inner coil, a fourth inner coil, and a fifth inner coil;

[0017] Specifically, the five inner coils are respectively connected to the first electric control connecting piece in the transmitting end tool;

[0018] Specifically, a first convex ring is arranged on the outer wall of the upper end of the first inner tube, and the upper end of the first outer tube is connected to the first convex ring;

[0019] Specifically, the guiding head is centrally penetrated, the outer wall of the upper end of the guiding head is connected to the lower end of the first outer tube, and the inner wall of the upper end of the guiding head is connected to the lower end of the first inner tube.

[0020] Further, the outer coil assembly includes a second outer tube, a second inner tube, and a guiding seat;

[0021] Specifically, five coils are sequentially arranged on the outer wall of the second inner tube from top to bottom, which are divided into a first outer coil, a second outer coil, a third outer coil, a fourth outer coil, and a fifth outer coil;

[0022] Specifically, the five outer coils are respectively connected to the second electric control connecting piece in the transmitting end tool;

[0023] Specifically, a second convex ring is provided on the inner wall of the upper end of the second outer tube, and the upper end of the second inner tube is connected to the second convex ring;

[0024] Specifically, the center of the guiding seat is a stepped hole. The outer wall of the upper end of the guiding seat is connected to the lower end of the first outer tube, and the inner wall of the upper end of the guiding seat is connected to the lower end of the first inner tube.

[0025] Further, when the guiding head lands on the guiding seat, the first inner coil, the second inner coil, the third inner coil, the fourth inner coil, the fifth inner coil correspond one by one to the first outer coil, the second outer coil, the third outer coil, the fourth outer coil, the fifth outer coil;

[0026] Specifically, the first inner coil and the first outer coil serve as a high-voltage transmission coil group;

[0027] Specifically, the second inner coil and the second outer coil serve as a medium-voltage transmission coil group;

[0028] Specifically, the third inner coil and the third outer coil serve as a low-voltage transmission coil group;

[0029] Specifically, the fourth inner coil and the fourth outer coil serve as a first communication coil group;

[0030] Specifically, the fifth inner coil and the fifth outer coil serve as a second communication coil group.

[0031] Further, the distance between any two of the first inner coil, the second inner coil, and the third inner coil is a first distance, and the distance between any two of the first outer coil, the second outer coil, and the third outer coil is the first distance;

[0032] Specifically, the distance between the fourth inner coil and the fifth inner coil and the distance between the fourth outer coil and the fifth outer coil are a second distance;

[0033] Specifically, the distance between the third inner coil and the fourth inner coil and the distance between the third outer coil and the fourth outer coil are a third distance.

[0034] Specifically, the first distance is less than the second distance, and the second distance is less than the third distance.

[0035] Further, a partition ring is provided inside the second outer tube. The partition ring is located between the third outer coil and the fourth outer coil, and the inner diameter of the partition ring is the same as the outer diameter of the second inner tube.

[0036] In order to achieve the above object, the present invention adopts the following technical solutions:

[0037] Application of a non-contact power connector for oil wells, characterized in that a non-contact power connector for oil wells is applied to the power and communication connections of medium-depth oil wells.

[0038] To achieve the above object, the present invention adopts the following technical solutions:

[0039] A method for using a layered production tubing string of a non-contact power connector for oil wells, characterized by comprising the following steps:

[0040] S1. Assemble the layered tubing string, which includes a first tubing, a release anchor, a receiving end tool, a cable-through packer, an intelligent flow controller, and a plug.

[0041] S2. Lower the layered tubing string into the well, set the cable-through packer, anchor the release anchor, release the connection, and lift out the tubing string above the release anchor.

[0042] S3. Assemble the production tubing string, which includes a second tubing, a cable-through tubing anchor, a sucker rod pump, and a transmitting end tool from top to bottom.

[0043] S4. Lower the production tubing string into the wellbore, make the guide head of the transmitting end tool fall on the guide seat step of the receiving end tool, and make the inner coil correspond to the outer coil one by one; complete the anchoring of the cable-through tubing anchor and adjust the production rates of all intelligent flow controllers.

[0044] S5. Start the pumping unit for production and extract production data.

[0045] S6. When maintenance of the production tubing string is required, lift out the production tubing string for maintenance. After completion of the maintenance, lower the production tubing string into the wellbore, make the guide head of the transmitting end tool fall on the guide seat step of the receiving end tool, re-establish the connection, and restore the power supply and communication between the surface and the wellbore.

[0046] S7. When all the tubing strings need to be lifted out, first lift out the production tubing string; lower a fishing tubing string to connect with the release anchor at the uppermost end of the layered tubing string; release and unclog the cable-through packer, lift the fishing tubing string, and lift out the layered tubing string together.

[0047] Further, when assembling the layered tubing string, set the receiving end tool at the upper end of the first tubing, set the release anchor at the upper end of the receiving end tool, set the plug at the lower end of the first tubing, combine the cable-through packer and the intelligent flow controller into a set of injection-production unit, where the intelligent flow controller is set below the cable-through packer, set at least two sets of injection-production units on the first tubing, connect all the intelligent flow controllers in series using a cable, and then connect them to the second electrical control connector of the receiving end tool.

[0048] Specifically, when assembling the production tubing string, the cable-through tubing anchor is set on the second tubing, the transmitting end tool is set at the lower end of the second tubing, the ground control cabinet is connected to the first electric control connection part of the transmitting end tool using a cable, and the sucker rod pump is set below the cable-through tubing anchor in the second tubing;

[0049] Further, among the inner coil and the outer coil, the first inner coil, the second inner coil, the third inner coil, the fourth inner coil, the fifth inner coil correspond to the first outer coil, the second outer coil, the third outer coil, the fourth outer coil, the fifth outer coil one by one;

[0050] Specifically, in the process of electric energy transmission: The ground control cabinet is connected to the first electric control of the transmitting end tool through a cable, and high-voltage transmission is carried out through the first inner coil and the first outer coil to supply power to the driving unit of the second electric control connection part;

[0051] Specifically, medium-voltage transmission is carried out through the second inner coil and the second outer coil to supply power to the electric control interface unit of the second electric control connection part;

[0052] Specifically, low-voltage transmission is carried out through the third inner coil and the third outer coil to supply power to the low-voltage components of the second electric control connection part;

[0053] Specifically, bidirectional data and command transmission between the transmitting end tool and the receiving end tool is realized through the fourth inner coil and the fourth outer coil and the fifth inner coil and the fifth outer coil;

[0054] Specifically, the receiving end tool and the intelligent production allocation device are connected through a single-core cable and adopt master-slave DC carrier communication.

[0055] The present invention has the following beneficial effects compared with the prior art:

[0056] 1. In the traditional downhole intelligent separate production technology, due to the well depth, the traditional cable power supply system cannot continuously supply power, so the goal of long-term well placement production of tools cannot be achieved. At the same time, in the traditional pump inspection operation, all the tubing strings need to be pulled out for the next trip of tubing, resulting in low pump inspection efficiency, poor system maintainability, and high construction costs. Through the application of the non-contact electric connector for oil wells in the present invention, on the basis of realizing the basic function of accurate measurement and adjustment of the production allocation layer, the pump inspection efficiency is improved, the system maintenance cost is reduced, and the flexibility of the application of downhole intelligent measurement and control technology is improved. It avoids the damage to the layered tubing tools caused by the operation of pulling out the production tubing string.

[0057] 2. Non-contact power connector for oil wells, a tool that integrates power and signal dual-channel multi-condition communication and power supply based on magnetoelectric coupling technology. It uses a multi-section coil that can transmit electrical energy from high voltage 220V to low voltage 24V. The signal also uses a double-group communication coil, which can achieve synchronous transmission of different combinations of electrical energy and communication signals. And between the coils, through a shielded cavity structure, it realizes shielding the mutual interference between electrical energy and signals in each cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 FIG. is a schematic structural diagram of a layered production tubing string of a non-contact power connector for oil wells according to the present invention;

[0059] Figure 2 FIG. is a schematic structural diagram of a transmitting end tool of a non-contact power connector for oil wells according to the present invention;

[0060] Figure 3 FIG. is a schematic structural diagram of a receiving end tool of a non-contact power connector for oil wells according to the present invention;

[0061] Figure 4 FIG. is a schematic structural diagram of the coupling between the inner coil and the outer coil of a non-contact power connector for oil wells according to the present invention;

[0062] In the figure: 1, pumping unit; 2, surface control cabinet; 3, cable-through tubing anchor; 4, transmitting end tool; 5, releasing anchor; 6, receiving end tool; 7, cable-through packer; 8, intelligent flow controller; 9, artificial bottom hole; 10, plug; 11, wellbore;

[0063] 401, first inner coil; 402, second inner coil; 403, third inner coil; 404, fourth inner coil; 405, fifth inner coil; 406, first electronic control cavity;

[0064] 601, first outer coil; 602, second outer coil; 603, third outer coil; 604, fourth outer coil; 605, fifth outer coil; 606, second electronic control cavity;

[0065] 001, first coupling coil; 002, second coupling coil; 003, third coupling coil; 004, fourth coupling coil; 005, fifth coupling coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0067] Example 1:

[0068] Please refer to Figures 2 to 3 , a non-contact power connector for oil wells provided by the present invention includes a transmitting end tool 4 and a receiving end tool 6;

[0069] The transmitting end tool 4 includes a first electric control connector 406 and an inner coil assembly connected in sequence. The inner coil assembly includes a first outer tube, a first inner tube, and a guide head. Five coils are sequentially arranged on the outer wall of the first inner tube from top to bottom, which are divided into a first inner coil 401, a second inner coil 402, a third inner coil 403, a fourth inner coil 404, and a fifth inner coil 405. The five inner coils 401-405 are respectively connected to the first electric control connector 406 in the transmitting end tool 4; a first convex ring is provided on the outer wall of the upper end of the first inner tube, the upper end of the first outer tube is connected to the first convex ring, the center of the guide head is through, the outer wall of the upper end of the guide head is connected to the lower end of the first outer tube, and the inner wall of the upper end of the guide head is connected to the lower end of the first inner tube.

[0070] The receiving end tool 6 includes an outer coil assembly and a second electric control connector 606 connected in sequence. The outer coil assembly includes a second outer tube, a second inner tube, and a guide seat. Five coils are sequentially arranged on the outer wall of the second inner tube from top to bottom, which are divided into a first outer coil 601, a second outer coil 602, a third outer coil 603, a fourth outer coil 604, and a fifth outer coil 605. The five outer coils 601-605 are respectively connected to the second electric control connector 606 in the receiving end tool 6; a second convex ring is provided on the inner wall of the upper end of the second outer tube, the upper end of the second inner tube is connected to the second convex ring, the center of the guide seat is a stepped hole, the outer wall of the upper end of the guide seat is connected to the lower end of the first outer tube, and the inner wall of the upper end of the guide seat is connected to the lower end of the first inner tube.

[0071] When the guide head falls on the guide seat, the first inner coil 401, the second inner coil 402, the third inner coil 403, the fourth inner coil 404, the fifth inner coil 405 correspond to the first outer coil 601, the second outer coil 602, the third outer coil 603, the fourth outer coil 604, the fifth outer coil 605 one by one;

[0072] The first inner coil 401 and the first outer coil 601 serve as a high-voltage transmission coil group 001 of 120V to achieve high-voltage electromagnetic coupling transmission and supply power to the driving unit of the second electric control connector;

[0073] The second inner coil 402 and the second outer coil 602 serve as a medium-voltage transmission coil group 002 of 60V to achieve medium-voltage electromagnetic coupling transmission and supply power to the electric control interface of the second electric control connector;

[0074] The third inner coil 403 and the third outer coil 603 serve as the 24V low-voltage transmission coil group 003 to achieve low-voltage electromagnetic coupling transmission and supply power to low-voltage components such as the control unit of the second electrical control connector.

[0075] The fourth inner coil 404 and the fourth outer coil 604 serve as the first communication coil group 004; the fifth inner coil 405 and the fifth outer coil 605 serve as the second communication coil group 005 to realize the bidirectional transmission of data and commands between the transmitting tool 4 and the receiving tool 6.

[0076] The receiving tool 6 and the intelligent production allocator 8 are connected by a single-core cable and adopt master-slave DC carrier communication.

[0077] The distances between the first inner coil 401, the second inner coil 402, and the third inner coil 403 are the first distance, and the distances between the first outer coil 601, the second outer coil 602, and the third outer coil 603 are the first distance.

[0078] The distance between the fourth inner coil 404 and the fifth inner coil 405 and the distance between the fourth outer coil 604 and the fifth outer coil 605 are the second distance.

[0079] The distance between the third inner coil 403 and the fourth inner coil 404 and the distance between the third outer coil 603 and the fourth outer coil 604 are the third distance.

[0080] The first distance is less than the second distance, the second distance is less than the third distance, a partition ring is arranged in the second outer tube, the partition ring is located between the third outer coil 603 and the fourth outer coil 604, and the inner diameter of the partition ring is the same as the outer diameter of the second inner tube to prevent power transmission from interfering with communication.

[0081] Specifically, all the above-mentioned coils are wound in a spiral manner and wound in the coil grooves of the corresponding inner tubes, and the turns of the coils are smoothly connected.

[0082] Start winding the wire from the starting end of the limiting groove along the limiting groove to the end of the limiting groove to form the first turn of the coil. The end of the first turn of the limiting groove is the starting end of the second turn of the coil. Then continue to wind from the end of the limiting groove along the limiting groove to the starting end of the limiting groove to form the second turn of the coil. The end of the second turn of the limiting groove is the starting end of the third turn of the coil, and so on until the end of the Nth turn of the coil is connected to the starting end of the first turn of the limiting groove to form the Nth turn of the coil.

[0083] This connector is especially suitable for power connection in medium-depth oil wells.

[0084] The first and second electronic control connectors are used to transmit the electric energy on the cable from the sending-end tool to the receiving-end tool and achieve two-way communication transmission. The ground control cabinet 2 sends communication signals and electric energy to the first electronic control connector 406 through the cable, then transmits the communication signals and electric energy to the fourth inner coil 404, and then the fourth inner coil 404 wirelessly sends them to the fourth outer coil 604, and then transmits them to the second electronic control connector 606, and then transmits the communication signals and electric energy to the intelligent well production allocator through the cable; when communicating in the reverse direction, the intelligent well production allocator transmits through the cable to the second electronic control connector 606, the fifth outer coil 605, wirelessly sends them to the fifth inner coil 405, the first electronic control connector 406, and then transmits through the cable to the ground control cabinet 2;

[0085] The rectifier filter circuit and the modulation and demodulation circuit of the communication signal are both in the first and second electronic control connectors, so I removed this part of the description;

[0086] This multi-segment coil wireless power transmission and communication method based on the electromagnetic coupling principle realizes, on the one hand, the two-way non-contact transmission of downhole electric energy and signals; on the other hand, through the division and combination method of multi-segment coils, it avoids the mutual interference when the load end has different supply voltages and different communication frequencies for control.

[0087] Embodiment 2:

[0088] On the basis of Embodiment 1, combined with Figure 1 , this embodiment provides a usage method of a layered production tubing string of a non-contact power connector for oil wells.

[0089] S1. Assemble the layered tubing string;

[0090] The layered tubing string includes a first tubing, a releasing anchor 5, a receiving-end tool 6, a cable-passing packer 7, an intelligent well production allocator 8, and a plug 10; the receiving-end tool 6 is arranged at the upper end of the first tubing, the releasing anchor 5 is arranged at the upper end of the receiving-end tool 6, the plug 10 is arranged at the lower end of the first tubing, the cable-passing packer 7 and the intelligent well production allocator 8 are combined into a set of injection-production unit, where the intelligent well production allocator 8 is arranged below the cable-passing packer 7, at least two sets of injection-production units are arranged on the first tubing, all intelligent well production allocators 8 are connected in series using a cable, and then connected to the second electronic control connector 606 of the receiving-end tool 6;

[0091] S2. Lower the layered tubing string into the well, set the cable-passing packer 7, and anchor the releasing anchor 5. Release the anchor and lift out the upper tubing string of the releasing anchor;

[0092] S3. Assemble the production tubing string;

[0093] The production tubing string includes a second tubing, a cable - through tubing anchor 3, a sucker rod pump, and a transmitting - end tool 4. The cable - through tubing anchor 3 is arranged on the second tubing, the transmitting - end tool 4 is arranged at the lower end of the second tubing. A cable is used to connect the ground control cabinet 2 with the first electric control connector 406 of the transmitting - end tool 4, and the sucker rod pump is arranged below the cable - through tubing anchor 3 in the second tubing;

[0094] S4. Lower the production tubing string into the wellbore 11 so that the guide head of the transmitting - end tool 4 lands on the guiding seat step of the receiving - end tool 6, making the first inner coil 401, the second inner coil 402, the third inner coil 403, the fourth inner coil 404, the fifth inner coil 405 correspond one - by - one with the first outer coil 601, the second outer coil 602, the third outer coil 603, the fourth outer coil 604, the fifth outer coil 605;

[0095] S5. Complete the anchoring of the cable - through tubing anchor 3 and adjust the production rates of all intelligent flow - control devices 8;

[0096] S6. Start the pumping unit 1 for production and extract production data;

[0097] S7. When maintenance of the production tubing string is required, lift the production tubing string out for maintenance. After the maintenance is completed, lower the production tubing string into the wellbore so that the guide head of the transmitting - end tool 4 lands on the guiding seat step of the receiving - end tool 6, re - establish the connection, and restore the power supply and communication between the ground and the downhole;

[0098] S8. When all the tubing strings need to be lifted out, first lift out the production tubing string; lower the fishing tubing string and dock it with the release - type anchor 5 at the uppermost end of the stratified tubing string; release and unclamp the cable - through packer 7, lift the fishing tubing string, and lift out the stratified tubing string together.

[0099] The main function of this embodiment is to change the operation mode of the tool that needs to lift out all the tubing strings in the original pump - checking process to a mode of only lifting out the production tubing string for pump - checking and maintenance through the non - contact magnetoelectric coupling method. Then, in combination with the use of the release - type anchor fishing tool and the fishing tubing string, the operation requirement of lifting out all the tubing strings can be completed.

[0100] By combining the cable - through packer 7 and the intelligent flow - control device 8, independent separation of each production layer is achieved. Through the sensors built in the intelligent flow - control device 8 tool, real - time monitoring of the production layer flow rate, tubing internal pressure, tubing external pressure, and temperature is realized. The ground monitoring system can perform real - time regulation of the opening degree of the intelligent flow - control device 8 of each production layer according to the liquid production situation.

[0101] Under the condition that the wellhead has a continuous power supply, the wireless two - way data communication function between the ground control box and the water - distribution room or the office computer can be realized. Users can control the working states of the actions of the downhole cable - direct control survey and adjustment switch or the flow - control device in real time through the office terminal.

[0102] In the workover operation of pulling the pump, through the releasing structure, the upper tool string of the production tubing string is pulled out of the well for maintenance, and the multi-layer tubing string part is left in the well for a long time, so as to improve the efficiency of pulling the pump without pulling out all the tubing strings and play a role in timely maintenance.

[0103] In this application, all the components that are not elaborated and the connection methods of the components in this application belong to the well-known technologies in the technical field. They can be directly applied and will not be elaborated further.

[0104] In the present invention, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0105] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0106] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0107] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-contact power connector for oil wells, characterized in that, it includes a transmitting end tool and a receiving end tool; the transmitting end tool includes a first electric control connector and an inner coil assembly connected in sequence; the receiving end tool includes an outer coil assembly and a second electric control connector connected in sequence.

2. The non-contact power connector for oil wells according to claim 1, characterized in that, the inner coil assembly includes a first outer tube, a first inner tube, and a guide head; five coils are sequentially arranged on the outer wall of the first inner tube from top to bottom, and are divided into a first inner coil, a second inner coil, a third inner coil, a fourth inner coil, and a fifth inner coil; the five inner coils are respectively connected to the first electric control connector in the transmitting end tool; a first convex ring is arranged on the outer wall of the upper end of the first inner tube, and the upper end of the first outer tube is connected to the first convex ring; the guide head is centrally penetrated, the outer wall of the upper end of the guide head is connected to the lower end of the first outer tube, and the inner wall of the upper end of the guide head is connected to the lower end of the first inner tube.

3. The non-contact power connector for oil wells according to claim 2, characterized in that, the outer coil assembly includes a second outer tube, a second inner tube, and a guide seat; five coils are sequentially arranged on the outer wall of the second inner tube from top to bottom, and are divided into a first outer coil, a second outer coil, a third outer coil, a fourth outer coil, and a fifth outer coil; the five outer coils are respectively connected to the second electric control connector in the transmitting end tool; a second convex ring is arranged on the inner wall of the upper end of the second outer tube, and the upper end of the second inner tube is connected to the second convex ring; the guide seat has a stepped hole in the center, the outer wall of the upper end of the guide seat is connected to the lower end of the first outer tube, and the inner wall of the upper end of the guide seat is connected to the lower end of the first inner tube.

4. The non-contact power connector for oil wells according to claim 3, characterized in that, when the guide head lands on the guide seat, the first inner coil, the second inner coil, the third inner coil, the fourth inner coil, the fifth inner coil correspond to the first outer coil, the second outer coil, the third outer coil, the fourth outer coil, the fifth outer coil one by one; the first inner coil and the first outer coil serve as a high-voltage transmission coil group; the second inner coil and the second outer coil serve as a medium-voltage transmission coil group; the third inner coil and the third outer coil serve as a low-voltage transmission coil group; the fourth inner coil and the fourth outer coil serve as a first communication coil group; the fifth inner coil and the fifth outer coil serve as a second communication coil group.

5. The non-contact power connector for oil wells according to claim 4, characterized in that, the distance between every two of the first inner coil, the second inner coil, and the third inner coil is a first distance, and the distance between every two of the first outer coil, the second outer coil, and the third outer coil is a first distance; the distance between the fourth inner coil and the fifth inner coil and the distance between the fourth outer coil and the fifth outer coil are a second distance; the distance between the third inner coil and the fourth inner coil and the distance between the third outer coil and the fourth outer coil are a third distance; the first distance is less than the second distance, and the second distance is less than the third distance.

6. The non-contact power connector for oil wells according to claim 4, characterized in that, A separation ring is arranged inside the second outer pipe. The separation ring is located between the third outer wire coil and the fourth outer wire coil, and the inner diameter of the separation ring is the same as the outer diameter of the second inner pipe.

7. Application of a non-contact power connector for oil wells Characterized in that A non-contact power connector for oil wells is applied to the power and communication connections of medium-depth oil wells.

8. Usage method of a layered production tubing string of a non-contact power connector for oil wells Characterized in that It includes the following steps: S1. Assemble the layered tubing string, which includes the first tubing, a release anchor, a receiving-end tool, a cable-through packer, an intelligent flow controller, and a plug; S2. Lower the layered tubing string into the well, set the cable-through packer, anchor the release anchor, release it, and lift out the upper tubing string of the release anchor; S3. Assemble the production tubing string, which includes the second tubing from top to bottom, a cable-through tubing anchor, a sucker rod pump, and a transmitting-end tool; S4. Lower the production tubing string into the wellbore, make the guiding head of the transmitting-end tool fall on the guiding seat step of the receiving-end tool, and make the inner coils and outer coils correspond one by one; complete the anchoring of the cable-through tubing anchor, and adjust the production rates of all intelligent flow controllers; S5. Start the pumping unit for production and extract production data; S6. When maintenance of the production tubing string is required, lift the production tubing string out for maintenance. After the maintenance is completed, lower the production tubing string into the wellbore, make the guiding head of the transmitting-end tool fall on the guiding seat step of the receiving-end tool, re-establish the connection, and restore the power supply and communication between the surface and the downhole; S7. When all the tubing strings need to be lifted out, first lift out the production tubing string; lower the fishing tubing string and connect it to the release anchor at the topmost end of the layered tubing string; release and unclamp the cable-through packer, lift the fishing tubing string, and lift out the layered tubing string together.

9. Usage method of a layered production tubing string of a non-contact power connector for oil wells according to claim 8 Characterized in that When assembling the layered tubing string, set the receiving-end tool at the upper end of the first tubing, set the release anchor at the upper end of the receiving-end tool, set the plug at the lower end of the first tubing, combine the cable-through packer and the intelligent flow controller into a set of injection-production unit, where the intelligent flow controller is set below the cable-through packer, set at least two sets of injection-production units on the first tubing, connect all the intelligent flow controllers in series using a cable, and then connect them to the second electric control connector of the receiving-end tool; When assembling the production tubing string, set the cable-through tubing anchor on the second tubing, set the transmitting-end tool at the lower end of the second tubing, connect the surface control cabinet to the first electric control connector of the transmitting-end tool using a cable, and set the sucker rod pump below the cable-through tubing anchor in the second tubing.

10. Usage method of a layered production tubing string of a non-contact power connector for oil wells according to claim 8 Characterized in that Among the inner coils and outer coils, the first inner coil, the second inner coil, the third inner coil, the fourth inner coil, and the fifth inner coil correspond one by one to the first outer coil, the second outer coil, the third outer coil, the fourth outer coil, and the fifth outer coil; Electric energy transmission process: The ground control cabinet is connected to the first electronic control of the transmitting-end tool through a cable, and high-voltage transmission is carried out through the first inner coil and the first outer coil to supply power to the drive unit of the second electronic control connection part; Medium-voltage transmission is carried out through the second inner coil and the second outer coil to supply power to the electronic control interface unit of the second electronic control connection part; Low-voltage transmission is carried out through the third inner coil and the third outer coil to supply power to the low-voltage components of the second electronic control connection part; Bidirectional transmission of data and commands between the transmitting-end tool and the receiving-end tool is realized through the fourth inner coil and the fourth outer coil and the fifth inner coil and the fifth outer coil; The receiving-end tool and the intelligent production allocator are connected by a single-core cable and adopt master-slave DC carrier communication.

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