A non-contact power connection device for offshore oil fields

Abstract

The application relates to a non-contact power connection device for offshore oil fields, which comprises a transmitting inner cylinder and a receiving outer cylinder, one end of the transmitting inner cylinder is used for being connected with the lower end of an external production pipe column, one end of the receiving outer cylinder is used for being connected with the upper end of an external production pipe column, the transmitting inner cylinder is inserted into the inside of the receiving outer cylinder and a gap is formed between the transmitting inner cylinder and the receiving outer cylinder, wherein a wireless transmitting device is arranged on the position of the transmitting inner cylinder inside the receiving outer cylinder, a wireless receiving device is arranged on the position of the receiving outer cylinder corresponding to the wireless transmitting device, the wireless transmitting device is electrically connected with a ground control system, the wireless receiving device is electrically connected with an electric control tool on the production pipe column, and the wireless transmitting device and the wireless receiving device are configured to transmit electric energy and signals through a magnetic coupling resonance principle. The non-contact power connection device for offshore oil fields can improve the reliability of the electric energy and signal transmission of the downhole of the oil field production well and improve the electric energy and signal transmission efficiency of the downhole.

Description

Technical Field

[0001] This invention belongs to the field of oilfield development technology, specifically relating to a non-contact power connection device for offshore oilfields. Background Technology

[0002] During oil well production, well workover operations such as pump inspections are unavoidable, and the pump inspection cycle is shorter than the design life of the electrically controlled production string. Therefore, it is necessary to install a "hands-free" power and signal transmission tool between the production string and the production string to ensure reliable operation of both before and after pump inspections and well workovers. Furthermore, the downhole power and signal transmission tool must possess characteristics such as simple and reliable connection, and high transmission efficiency. Daqing Oilfield and Changqing Oilfield, among others, have proposed using downhole cable wet joints to address the adverse effects of pump inspections and other well workover operations on the downhole interlayer control tool (ICV, electrically controlled tool on the production string). This involves designing a corresponding in-tubing connection downhole cable wet joint, drawing inspiration from the open-hole logging drill pipe connection technology for horizontal wells.

[0003] Existing wet connectors for downhole power and signal transmission tools in oilfield production wells consist of an upper connector and a lower connector. During use, absolute contact between the conductive rings of these two parts is essential for reliable power and signal transmission. However, due to the complex downhole working environment and the influence of factors such as downhole pressure, temperature, vibration, media, and tubing expansion and contraction, wet connectors cannot guarantee insulation after connection. Furthermore, during repeated connection operations, the sealing rings between the upper and lower connectors often cannot be guaranteed to remain intact. If damage occurs, the conductive rings can become conductive through the well fluid to the metal casing, leading to a short circuit in the system. Summary of the Invention

[0004] In order to solve all or part of the above problems, the present invention aims to provide a non-contact power connection device for offshore oil fields, so as to improve the reliability and efficiency of downhole power and signal transmission in oilfield production wells.

[0005] This application provides a non-contact electrical connection device for offshore oil fields, including a transmitting inner cylinder and a receiving outer cylinder. One end of the transmitting inner cylinder is used to connect to the lower end of an external production tubing, and one end of the receiving outer cylinder is used to connect to the upper end of an external distribution tubing. The transmitting inner cylinder is inserted into the receiving outer cylinder with a gap between them. A wireless transmitting device is provided in the transmitting inner cylinder at a position inside the receiving outer cylinder, and a wireless receiving device is provided in the receiving outer cylinder at a position corresponding to the wireless transmitting device. The wireless transmitting device is electrically connected to a ground control system, and the wireless receiving device is electrically connected to an electrical control tool on the distribution tubing. At the same time, the wireless transmitting device and the wireless receiving device are configured to transmit electrical energy and signals through the principle of magnetic coupling resonance.

[0006] In some embodiments, the inner transmitting cylinder includes a transmitting electronic control section and a transmitting coupling section, and the outer receiving cylinder includes a receiving electronic control section and a receiving coupling section. A wireless transmitting device is disposed within the transmitting coupling section, and a wireless receiving device is disposed within the receiving coupling section. Specifically: the transmitting electronic control section contains a transmitting control circuit board for electrical connection to a ground control system; the wireless transmitting device includes a first coil and a first magnetic core, with the first coil electrically connected to the transmitting control circuit board. The receiving electronic control section contains a receiving control circuit board for electrical connection to an electrical control tool on a production line; the wireless receiving device includes a second coil and a second magnetic core, with the second coil electrically connected to the receiving control circuit board. The transmitting coupling section is inserted into the receiving coupling section, and the first magnetic core and the second magnetic core are correspondingly disposed.

[0007] In some embodiments, the transmitting electronic control unit includes an upper oil pipe connector, a first cable adapter, a first cable mounting base, a first electronic control cavity shell, a first central tube, a first outgoing wire encapsulation head, and a first wire-passing adapter, wherein the upper oil pipe connector, the first cable mounting base, the first electronic control cavity shell, and the first wire-passing adapter are screwed together in sequence; both ends of the first central tube are respectively sealed and inserted into the inner cavities of the first cable mounting base and the first wire-passing adapter; the first cable adapter is screwed into the mounting hole of the first cable mounting base; a transmitting electronic control cavity is formed between the first central tube and the first electronic control cavity shell, and a transmitting control circuit board is disposed in the transmitting electronic control cavity; the transmitting control circuit board is sealed and connected to the ground control system through the first cable adapter.

[0008] In some embodiments, the transmitting coupling portion includes a wire-passing sealing tube, an inner rigid body, an outer sheath, and a cone head. The two ends of the inner rigid body are respectively screwed to a first wire-passing adapter and a cone head. The outer sheath is sleeved on the inner rigid body, and a transmitting annular cavity is formed between the inner rigid body and the outer sheath. The first coil and the first magnetic core are disposed in the transmitting annular cavity. The wire-passing sealing tube is symmetrically inserted into the sealing holes at both ends of the first wire-passing adapter and the inner rigid body to form a sealed wire-passing channel. The wire-passing channel is used to seal the cable passing through to electrically connect the first coil and the transmitting control circuit board.

[0009] In some embodiments, the receiving coupling portion includes an upper housing, an inner sheath, a lower housing, and a second wire guide adapter, wherein the upper housing, the lower housing, and the second wire guide adapter are sequentially screwed together; the inner sheath is sleeved inside the upper housing and the lower housing, and a receiving annular cavity is formed between the inner sheath and the upper housing and the lower housing, and the second magnetic core and the second coil are disposed in the receiving annular cavity.

[0010] In some embodiments, the receiving electrical control section includes a second outgoing encapsulation head, a second electrical control cavity shell, a second central tube, a second cable mounting base, a second cable adapter, and a lower oil pipe connector. The second outgoing encapsulation head, the second electrical control cavity shell, the second cable mounting base, and the lower oil pipe connector are sequentially screwed together. Both ends of the second central tube are respectively inserted into the inner sealing holes of the second cable mounting base and the second cable adapter. A receiving electrical control cavity is formed between the second central tube and the second electrical control cavity shell, and a receiving control circuit board is disposed within the receiving electrical control cavity. The second cable adapter is screwed into the mounting hole of the second cable mounting base, and the receiving control circuit board is connected to the electrical control tool on the production pipeline column via the second cable adapter in a sealed connection.

[0011] In some embodiments, a first magnetic core is attached to and circumferentially bonded to the outer peripheral wall of the inner cylinder rigid body, and a first coil is spirally wound on the first magnetic core; a second magnetic core is attached to and circumferentially bonded to the inner peripheral walls of the upper and lower housings, and a second coil is spirally wound on the second magnetic core.

[0012] In some embodiments, the first magnetic core and the second magnetic core are respectively arranged in a plurality of axial directions.

[0013] In some embodiments, the screw-on construction is a threaded connection.

[0014] In some embodiments, concentric inner channels are formed through the inner transmitting cylinder and the outer receiving cylinder, and the minimum diameter of the inner channels is 62 mm.

[0015] The non-contact power connection device for offshore oil fields of the present invention has the following advantages: 1) It can realize wireless synchronous transmission of power and signals; 2) Power line carrier communication and magnetic coupling resonance technology work together; 3) It is a split type with a repeatable docking structure and electrical protection performance in an independent state; 4) It can achieve high power transmission efficiency and high wireless communication success rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a non-contact power connection device for offshore oil fields according to an embodiment of the present invention, showing the separated state of the inner transmitting cylinder and the outer receiving cylinder;

[0017] Figure 2 This is a schematic diagram of the structure of a non-contact power connection device for offshore oil fields according to an embodiment of the present invention, which shows the connection state of the inner transmitting cylinder and the outer receiving cylinder.

[0018] Figure 3 This is a schematic diagram of the structure of the launching inner cylinder according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the receiving outer cylinder according to an embodiment of the present invention. Detailed Implementation

[0020] To better understand the purpose, structure, and function of this invention, a non-contact power connection device for offshore oil fields will be described in further detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of a non-contact power connection device 100 for offshore oil fields according to an embodiment of the present invention, which shows the connection state of the inner transmitting cylinder 10 and the outer receiving cylinder 20. Figure 2 This is a schematic diagram of the structure of a non-contact power connection device 100 for offshore oil fields according to an embodiment of the present invention, showing the separated state of the inner transmitting cylinder 10 and the outer receiving cylinder 20; Figure 3 This is a schematic diagram of the structure of the inner launching cylinder 10 according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the receiving outer cylinder 20 according to an embodiment of the present invention. (In conjunction with...) Figures 1 to 4 As shown, the non-contact electrical connection device 100 for offshore oil fields includes a transmitting inner cylinder 10 and a receiving outer cylinder 20. One end of the transmitting inner cylinder 10 is used to connect to the lower end of an external production tubing, and one end of the receiving outer cylinder 20 is used to connect to the upper end of an external distribution tubing. The transmitting inner cylinder 10 is inserted into the receiving outer cylinder 20 with a gap between them. A wireless transmitting device 1 is installed in the transmitting inner cylinder 10 at a position inside the receiving outer cylinder 20, and a wireless receiving device 2 is installed in the receiving outer cylinder 20 at a position corresponding to the wireless transmitting device 1. The wireless transmitting device 1 is electrically connected to the ground control system, and the wireless receiving device 2 is electrically connected to the electrical control tools on the distribution tubing. At the same time, the wireless transmitting device 1 and the wireless receiving device 2 are configured to transmit electrical energy and signals through the principle of magnetic coupling resonance.

[0022] The non-contact power connection device 100 for offshore oilfields according to an embodiment of the present invention includes two parts: a transmitting inner cylinder 10 and a receiving outer cylinder 20. The transmitting inner cylinder 10 is connected to the lowest end of the production tubing, and the receiving outer cylinder 20 is connected to the highest end of the distribution tubing. In implementation, combined with... Figure 1 and Figure 2As shown, the receiving outer cylinder 20 is fixed downhole, and the transmitting inner cylinder 10 is gradually lowered into the well along with the production tubing until it is inserted into the receiving outer cylinder 20. The axial positioning of the transmitting inner cylinder 10 and the receiving outer cylinder 20 is achieved through the tool shoulder of the transmitting inner cylinder 10. At this time, the transmitting inner cylinder 10 and the receiving outer cylinder 20 are in a non-contact connection state. In this embodiment of the invention, the offshore oilfield non-contact power connection device 100 is equipped with a wireless transmitting device 1 electrically connected to the ground control system, and a wireless receiving device 2 electrically connected to the electrical control tool on the production tubing. In this way, the ground control system provides power and communication to the transmitting inner cylinder 10. Through the principle of magnetic coupling resonance, the wireless transmitting device 1 and the wireless receiving device 2 achieve the integration of power line carrier communication and magnetic coupling resonance technology, realizing bidirectional signal transmission while wirelessly transmitting electrical energy. This allows the electrical energy and signals coupled to the receiving outer cylinder 20 to be transmitted to the electrical control tool on the lower production tubing. When maintenance operations such as pump inspection are required, the production tubing is lifted to cause the inner launching cylinder 10 to detach upwards and separate from the outer receiving cylinder 20. The outer receiving cylinder 20 and the lower production tubing remain downhole. When reconnection is required, the inner launching cylinder 10 is lowered with the production tubing until it is inserted into the outer receiving cylinder 20, restoring the coupling and transmission of electrical energy and signals.

[0023] Compared to existing wet-joint technologies that require full contact for power and signal transmission, this invention employs a non-contact connection method, using a resonant coupling system to achieve wireless transmission of power and signals downhole. In this wireless power transmission process, the resonant coupling system first uses a high-frequency inverter to rectify the DC power from the surface, obtaining a high-frequency AC current. After resonant compensation, this high-frequency AC current is applied to the primary coil of the coupling transformer, generating a corresponding magnetic field. The receiving end's coupling transformer coil (also called the secondary coil) induces the magnetic field and couples out an AC signal, which is then rectified and filtered to output DC power, supplying it to the downhole layer control tools, thus achieving wireless power transmission downhole. For wireless signal transmission, the carrier communication unit establishes bidirectional communication with the surface control system via a single-core cable. The digital signal is then converted into a high-frequency alternating signal by a modem, and then transmitted through the signal transmission circuit and coupling transformer to the receiving end's signal transmission circuit. The modem then parses the signal and transmits it to the downhole layer control tools. Data from the layer control tools is also transmitted to the carrier communication unit via the same path, thus establishing a bidirectional wireless communication system downhole.

[0024] With the above-mentioned configuration, the non-contact power connection device 100 for offshore oil fields of the present invention has the following advantages: 1) The non-contact power connection device 100 for offshore oil fields of the present invention can realize wireless synchronous transmission of power and signals; 2) The non-contact power connection device 100 for offshore oil fields of the present invention combines power line carrier communication and magnetic coupling resonance technology; 3) The non-contact power connection device 100 for offshore oil fields of the present invention is a split type, with a reusable docking structure and electrical protection performance in an independent state; 4) The non-contact power connection device 100 for offshore oil fields of the present invention can achieve high power transmission efficiency (above 90%) and high wireless communication success rate (above 95%).

[0025] Please refer to Figure 3 and Figure 4 In some embodiments, the inner transmitting cylinder 10 may include a transmitting electronic control section 11 and a transmitting coupling section 12, and the outer receiving cylinder 20 may include a receiving electronic control section 21 and a receiving coupling section 22. A wireless transmitting device 1 is disposed within the transmitting coupling section 12, and a wireless receiving device 2 is disposed within the receiving coupling section 22. Specifically: the transmitting electronic control section 11 contains a transmitting control circuit board 13 for electrical connection to a ground control system; the wireless transmitting device 1 includes a first coil 14 and a first magnetic core 15, with the first coil 14 electrically connected to the transmitting control circuit board 13; the receiving electronic control section 21 contains a receiving control circuit board 23 for electrical connection to an electrical control tool on the production line; the wireless receiving device 2 includes a second coil 24 and a second magnetic core 25, with the second coil 24 electrically connected to the receiving control circuit board 23; the transmitting coupling section 12 is inserted into the receiving coupling section 22, and the first magnetic core 15 and the second magnetic core 25 are correspondingly disposed.

[0026] Based on the above discussion, the specific coupling method of the non-contact electrical connection device 100 for offshore oil fields in this application is as follows:

[0027] In the wireless power transmission process, a high-frequency inverter is first used to rectify the DC power supply from the ground to obtain a high-frequency AC current. Then, after resonant compensation, the high-frequency AC current is loaded into the first coil 14 of the coupling transformer. The alternating current generates a corresponding magnetic field. The second coil 24 induces the magnetic field and couples out an AC electrical signal. After rectification and filtering, the output is DC power, which is supplied to the electrical control tools on the production string. This realizes the wireless power transmission downhole.

[0028] In terms of wireless signal transmission, the carrier communication unit establishes two-way communication with the ground control system through a single-core cable. The digital signal is then converted into a high-frequency alternating signal by a modem, and then transmitted to the signal transmission circuit at the receiving end through the signal transmission circuit and coupling transformer. The modem then parses the signal and finally transmits it to the electrical control tool on the production string. Data from the electrical control tool on the production string is also transmitted to the carrier communication unit through the same path, thus establishing a downhole two-way wireless communication system.

[0029] It should be noted that all the above functions can be driven and controlled by the transmission control circuit board 13 and the reception control circuit board 23, and the components on them can be selected according to the specific functions and implementation methods. The magnetic coupling resonance principle (or the resonant coupling system) can all adopt existing coupling resonance technology.

[0030] Please refer to Figure 3 In some embodiments, the launch control unit 11 may include an upper oil pipe connector 111, a first cable adapter 112, a first cable mounting base 113, a first control cavity housing 114, a first central tube 115, a first outgoing wire encapsulation head 116, and a first wire-passing adapter 117. The upper oil pipe connector 111, the first cable mounting base 113, the first control cavity housing 114, and the first wire-passing adapter 117 are sequentially screwed together. The two ends of the first central tube 115 are respectively sealed and inserted into the inner cavities of the first cable mounting base 113 and the first wire-passing adapter 117. The first cable adapter 112 is screwed into the mounting hole of the first cable mounting base 113. A launch control cavity 304 is formed between the first central tube 115 and the first control cavity housing 114, and a launch control circuit board 13 is disposed within the launch control cavity 304. The launch control circuit board 13 is sealed and connected to the ground control system via the first cable adapter 112.

[0031] The term "screw connection" as used in this application can be understood as a threaded connection. The terms "upper" and "lower" as used in this application can be interpreted in conjunction with the orientation shown in the accompanying drawings. In this application, the upper oil pipe connector 111 in the inner firing cylinder 10 is threadedly connected to the upper internal thread of the first cable mounting base 113; the first electrical control cavity housing 114 is threadedly connected to the lower external thread of the first cable mounting base 113; the first wire-passing adapter 117 is threadedly connected to the lower internal thread of the first electrical control cavity housing 114; both ends of the first central tube 115 are respectively inserted into the sealing holes of the inner cavities of the first cable mounting base 113 and the first wire-passing adapter 117. The first central tube 115 and the first cable mounting base 113 can be prevented from rotating relative to each other through a key and keyway connection.

[0032] Please continue to refer to Figure 3In some embodiments, the transmitting coupling portion 12 may include a wire-passing sealing tube 118, an inner rigid body 119, an outer sheath 301, and a cone head 302. The two ends of the inner rigid body 119 are respectively screwed to the first wire-passing adapter 117 and the cone head 302. The outer sheath 301 is sleeved on the inner rigid body 119. At the same time, a transmitting annular cavity 303 is formed between the inner rigid body 119 and the outer sheath 301. The first coil 14 and the first magnetic core 15 are disposed in the transmitting annular cavity 303. The wire-passing sealing tube 118 is symmetrically inserted into the sealing holes at both ends of the first wire-passing adapter 117 and the inner rigid body 119 to form a sealed wire-passing channel. The wire-passing channel is used to seal the cable passing through to electrically connect the first coil 14 and the transmitting control circuit board 13.

[0033] The screw connection mentioned in this application can be understood as a threaded connection. The terms "upper" and "lower" mentioned in this application can be used in conjunction with the orientation shown in the accompanying drawings. In this application, the inner cylinder rigid body 119 is screwed into the internal thread at the lower end of the first wire-passing adapter 117; the first coil 14 and the first magnetic core 15 are bonded to the transmitting annular cavity 303; the cone head 302 is screwed into the external thread at the lower end of the first wire-passing adapter 117. The wire-passing sealing tube 118 is symmetrically inserted into the sealing holes at both ends of the first wire-passing adapter 117 and the inner cylinder rigid body 119 to form a sealed wire-passing channel. The lead wire of the first coil 14 passes through the inner hole of the wire-passing sealing tube 118, and the pressure-bearing seal of the lead wire of the first coil 14 is achieved through the first wire-exit encapsulation head 116. The lead wire is connected to the transmitting electronic control cavity 304 and connected to the transmitting control circuit board 13. The first cable adapter 112 is screwed into the mounting hole of the first cable mounting base 113. The external single-core steel pipe cable is sealed through the first cable adapter 112 and connected to the transmitter control cavity 304 and the transmitter control circuit board 13.

[0034] Please refer to Figure 4 In some embodiments, the receiving coupling portion 22 may include an upper housing 221, an inner sheath 222, a lower housing 223, and a second wire-passing adapter 224, wherein the upper housing 221, the lower housing 223, and the second wire-passing adapter 224 are screwed together in sequence; the inner sheath 222 is sleeved inside the upper housing 221 and the lower housing 223, and a receiving annular cavity 225 is formed between the inner sheath 222 and the upper housing 221 and the lower housing 223, and the second magnetic core 25 and the second coil 24 are disposed inside the receiving annular cavity 225.

[0035] The term "screw connection" as used in this application can be understood as a threaded connection. The terms "upper" and "lower" as used in this application can be interpreted in conjunction with the orientation shown in the accompanying drawings. In this application, the upper housing 221 of the receiving outer cylinder 20 is screwed onto the upper external thread of the lower housing 223, and the lower housing 223 is screwed onto the upper external thread of the second wire-passing adapter 224; the second magnetic core 25 and the second coil 24 are bonded to the receiving annular cavity 225 formed by the upper housing 221, the lower housing 223, and the inner sheath 222.

[0036] Please continue to refer to Figure 4 In some embodiments, the receiving electronic control section 21 includes a second outgoing wire encapsulation head 226, a second electronic control cavity shell 227, a second central tube 228, a second cable mounting base 229, a second cable adapter 304, and a lower oil pipe connector 305. The second outgoing wire encapsulation head 226, the second electronic control cavity shell 227, the second cable mounting base 229, and the lower oil pipe connector 305 are sequentially screwed together. The two ends of the second central tube 228 are respectively inserted into the inner cavity sealing holes of the second cable mounting base 229 and the second wire adapter 224. A receiving electronic control cavity 306 is formed between the second central tube 228 and the second electronic control cavity shell 227. A receiving control circuit board 23 is disposed in the receiving electronic control cavity 306. The second cable adapter 304 is screwed into the mounting hole of the second cable mounting base 229. The receiving control circuit board 23 is connected to the electronic control tool on the production pipeline column through the second cable adapter 304 in a sealed connection.

[0037] The term "screw connection" as used in this application can be understood as a threaded connection. The terms "upper" and "lower" as used in this application can be interpreted in conjunction with the orientation shown in the accompanying drawings. In this application, the second electrical control cavity housing 227 is screwed onto the external thread at the lower end of the second cable outlet encapsulation head 226, and the second cable mounting base 229 is screwed onto the internal thread at the lower end of the second electrical control cavity housing 227. The two ends of the second central tube 228 are respectively inserted into the inner sealing holes of the second cable mounting base 229 and the second cable adapter 224. A key and keyway prevent rotation between the second central tube 228 and the second cable mounting base 229. The lower oil pipe connector 305 is screwed onto the internal thread at the lower end of the second cable mounting base 229. The lead wire of the second coil 24 passes through the inner hole of the second cable adapter 224, and the pressure-bearing seal of the coil lead wire is achieved through the second cable outlet encapsulation head 226. The lead wire is then connected to the receiving electrical control cavity 306 and connected to the receiving control circuit board 23. The second cable adapter 304 is screwed into the mounting hole of the second cable mounting base 229. The external single-core steel pipe cable is sealed through the second cable adapter 304 and connected to the receiving electrical control cavity 306, and connected to the receiving control circuit board 23.

[0038] In some embodiments, the first magnetic core 15 is attached to and circumferentially bonded to the outer peripheral wall of the inner cylinder rigid body 119, and the first coil 14 is spirally wound on the first magnetic core 15; the second magnetic core 25 is attached to and circumferentially bonded to the inner peripheral walls of the upper housing 221 and the lower housing 223, and the second coil 24 is spirally wound on the second magnetic core 25. With this configuration, when the transmitting inner cylinder 10 and the receiving outer cylinder 20 are connected, only the tool shoulder is needed to ensure axial positioning accuracy, thereby improving the ease of use of the non-contact power connection device 100 for offshore oil fields according to the embodiments of the present invention.

[0039] In some embodiments, the first magnetic core 15 and the second magnetic core 25 are respectively arranged in multiple axial directions. In this embodiment, it can be understood that the first magnetic core 15 and the second magnetic core 25 are respectively arranged in multiple axial directions, that is, the transmitting inner cylinder 10 and the receiving outer cylinder 20 include multiple sets of coupling groups. Setting multiple sets of coupling groups can not only further improve the power transmission efficiency and wireless communication success rate, but also further improve the transmission stability.

[0040] In some embodiments, the screw connection can be configured as a threaded connection. Of course, the screw connection can also be other rotational mating methods. Furthermore, when necessary, sealing components such as sealing rings can be provided at the connection location to improve the sealing performance of the connection.

[0041] Please refer to Figure 3 and Figure 4 In some embodiments, concentrically arranged inner channels 307 are formed throughout the inner launching cylinder 10 and the outer receiving cylinder 20, with a minimum diameter of 62 mm. With this arrangement, in operation, after the inner launching cylinder 10 is inserted into the outer receiving cylinder 20, all downhole produced fluid passes through the inner channel 307 at the center of the inner launching cylinder 10. The minimum diameter of 62 mm for the inner channel 307 at the center of the inner launching cylinder 10 and the outer receiving cylinder 20 meets the requirements for high-volume flow channels in offshore oilfield production wells.

[0042] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0043] In the description of this application, it should be understood that the terms "center", "upper", "lower", "inner", "outer", "axial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0044] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A non-contact electrical connection device for offshore oil fields, characterized in that, The device includes a transmitting inner cylinder and a receiving outer cylinder. One end of the transmitting inner cylinder is used to connect to the lower end of an external production column, and one end of the receiving outer cylinder is used to connect to the upper end of an external distribution column. The transmitting inner cylinder is inserted into the receiving outer cylinder with a gap between them. A wireless transmitting device is provided in the transmitting inner cylinder at a position inside the receiving outer cylinder, and a wireless receiving device is provided in the receiving outer cylinder at a corresponding position. The wireless transmitting device is electrically connected to a ground control system, and the wireless receiving device is electrically connected to an electrical control tool on the distribution column. The wireless transmitting device and the wireless receiving device are configured to transmit electrical energy and signals through the principle of magnetic coupling resonance. The inner transmitting cylinder includes a transmitting electronic control section and a transmitting coupling section, the outer receiving cylinder includes a receiving electronic control section and a receiving coupling section, the wireless transmitting device is disposed within the transmitting coupling section, and the wireless receiving device is disposed within the receiving coupling section, wherein: The transmitting electronic control section is provided with a transmitting control circuit board, which is used to be electrically connected to the ground control system. The wireless transmitting device includes a first coil and a first magnetic core, and the first coil is electrically connected to the transmitting control circuit board. The receiving electronic control section is provided with a receiving control circuit board, which is used to be electrically connected to the electronic control tool on the production column. The wireless receiving device includes a second coil and a second magnetic core, and the second coil is electrically connected to the receiving control circuit board. The transmitting coupling portion is inserted into the receiving coupling portion, and the first magnetic core and the second magnetic core are correspondingly arranged. The launch control unit includes an upper oil pipe connector, a first cable adapter, a first cable mounting base, a first control cavity shell, a first central tube, a first cable outlet encapsulation head, and a first cable guide adapter. The upper oil pipe connector, the first cable mounting base, the first control cavity shell, and the first cable guide adapter are sequentially screwed together. The two ends of the first central tube are respectively sealed and inserted into the inner cavities of the first cable mounting base and the first cable guide adapter. The first cable adapter is screwed into the mounting hole of the first cable mounting base. A launch control cavity is formed between the first central tube and the first control cavity shell, and the launch control circuit board is disposed within the launch control cavity. The launch control circuit board is sealed and connected to the ground control system via the first cable adapter.

2. The non-contact power connection device for offshore oil fields according to claim 1, characterized in that, The transmitting coupling part includes a wire-passing sealing tube, an inner rigid body, an outer sheath, and a cone head. The two ends of the inner rigid body are respectively screwed to the first wire-passing adapter and the cone head. The outer sheath is sleeved on the inner rigid body, and a transmitting annular cavity is formed between the inner rigid body and the outer sheath. The first coil and the first magnetic core are disposed in the transmitting annular cavity. The wire-passing sealing tube is symmetrically inserted into the sealing holes at both ends of the first wire-passing adapter and the inner rigid body to form a sealed wire-passing channel. The wire-passing channel is used to seal the cable passing through to electrically connect the first coil and the transmitting control circuit board.

3. The non-contact power connection device for offshore oil fields according to claim 2, characterized in that, The receiving coupling part includes an upper housing, an inner sheath, a lower housing, and a second wire guide adapter, wherein the upper housing, the lower housing, and the second wire guide adapter are screwed together in sequence; the inner sheath is sleeved inside the upper housing and the lower housing, and a receiving annular cavity is formed between the inner sheath, the upper housing, and the lower housing, and the second magnetic core and the second coil are disposed in the receiving annular cavity.

4. The non-contact power connection device for offshore oil fields according to claim 3, characterized in that, The receiving electrical control section includes a second outgoing encapsulation head, a second electrical control cavity shell, a second central tube, a second cable mounting base, a second cable adapter, and a lower oil pipe connector. The second outgoing encapsulation head, the second electrical control cavity shell, the second cable mounting base, and the lower oil pipe connector are sequentially screwed together. Both ends of the second central tube are respectively inserted into the inner sealing holes of the second cable mounting base and the second cable adapter. A receiving electrical control cavity is formed between the second central tube and the second electrical control cavity shell, and the receiving control circuit board is disposed within the receiving electrical control cavity. The second cable adapter is screwed into the mounting hole of the second cable mounting base, and the receiving control circuit board is connected to the electrical control tool on the production pipeline column via the second cable adapter in a sealed connection.

5. The non-contact power connection device for offshore oil fields according to claim 4, characterized in that, The first magnetic core is attached to and circumferentially bonded to the outer peripheral wall of the inner cylinder rigid body, and the first coil is spirally wound on the first magnetic core; the second magnetic core is attached to and circumferentially bonded to the inner peripheral walls of the upper shell and the lower shell, and the second coil is spirally wound on the second magnetic core.

6. The non-contact power connection device for offshore oil fields according to claim 5, characterized in that, The first magnetic core and the second magnetic core are respectively arranged in a plurality along the axial direction.

7. The non-contact electrical connection device for offshore oil fields according to any one of claims 1-6, characterized in that, The screw-on structure is a threaded connection.

8. The non-contact electrical connection device for offshore oil fields according to any one of claims 1-6, characterized in that, The inner transmitting cylinder and the outer receiving cylinder are connected by concentrically arranged inner channels, the minimum diameter of which is 62mm.

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