A novel connection structure for electromagnetically coupled intelligent stratified oil recovery

Abstract

This invention provides a novel electromagnetically coupled intelligent stratified oil production connection structure, including a surface controller, a production tubing string, and a distribution tubing string. The surface controller is used to collect downhole dynamic monitoring data, issue fluid volume adjustment commands for different formations, and interact with a data center. The production tubing string and the distribution tubing string are connected using a detachable drop-out tubing string structure. They achieve reliable wireless transmission of power and data through electromagnetic coupling. The core production tubing string transmitter and the distribution tubing string receiver synchronously transmit power and signals through magnetic coupling resonance technology, and achieve safe separation and rapid reconnection through shear rivets and guide grooves. During maintenance, only the production tubing string needs to be retrieved, while the distribution tubing string remains downhole. This solves the problems of cumbersome operation processes, the need to retrieve the entire tubing string for pump inspection, and the risk of packer failure and reduced pump efficiency due to tubing string creep in existing technologies.

Description

Technical Field

[0001] This utility model relates to the field of stratified oil recovery, and more specifically, to a novel connection structure for electromagnetically coupled intelligent stratified oil recovery. Background Technology

[0002] Currently, the integrated production tubing and distribution tubing adopt an integrated design structure. Its cables are tightly laid on the outer wall of the tubing with special clamps or binding straps, forming a continuous conductive path extending from the blowout preventer assembly at the wellhead to the pump hanger position at the bottom of the well, and precisely connecting to the signal interface and power module of the distribution equipment in each oil layer section. This structure can realize the entire operation process of layered mining with a single tubing run.

[0003] However, the operation is still cumbersome when using this technology. It requires precise control of the pressurization rate at the wellhead to prevent the packer from being released prematurely. Furthermore, the entire well string must be pulled out during subsequent pump inspections, which significantly increases well workover costs and downtime. At the same time, the tubing is prone to axial expansion and contraction due to changes in wellbore temperature gradient, formation pressure fluctuations, and the weight of the tubing itself. This tubing creep phenomenon will continuously squeeze or pull the packer sleeve, accelerating its aging and failure process, leading to interlayer flow and reduced pump efficiency. Utility Model Content

[0004] The main objective of this invention is to provide a novel connection structure for electromagnetically coupled intelligent stratified oil production. It adopts a detachable production tubing structure and utilizes the principle of electromagnetic coupling to achieve reliable transmission of electrical energy and data between the production tubing and the production tubing. This addresses at least the problems in the existing technology, such as cumbersome operation processes, the need to remove the entire tubing for pump inspection, and the tendency of tubing creep to cause packer failure and reduced pump efficiency.

[0005] To achieve the above objectives, this utility model provides a novel electromagnetic coupling intelligent stratified oil production connection structure, comprising: a ground controller connected to one end of a single-core cable; a production tubing connected to the other end of the single-core cable for receiving electrical energy and control signals transmitted by the ground controller; and a distribution tubing connected to the production tubing using a detachable drop-off tubing structure, and utilizing the principle of electromagnetic coupling to reliably transmit electrical energy and data, thereby achieving separation and repeated docking between the two.

[0006] Furthermore, the production column is equipped with shearing rivets, and the end of the production column is provided with a guide groove; wherein, the shearing rivets are detachably embedded in the guide groove to form the drop column structure.

[0007] Furthermore, the guide groove is configured as a U-shaped structure, with one end of the guide groove being an open structure and the other end being a closed structure; the shear rivet is embedded into the guide groove from the open structure, and the shear rivet slides to the closed structure to engage the feed tube and the production tube.

[0008] Furthermore, the guide groove, from the open structure to the closed structure, includes, in sequence, a first vertical section, an inclined section, and a second vertical section; wherein, the first vertical section and the second vertical section are both parallel to the central axis of the production tubing, and the inclined section forms a preset angle with the central axis of the production tubing.

[0009] Furthermore, the production tube column is equipped with a transmitter at the bottom and a receiver at the top of the distribution tube column. When the production tube column is inserted into the distribution tube column, the transmitter and receiver are connected to wirelessly transmit electrical energy and control signals to the distribution tube column via electromagnetic coupling.

[0010] Furthermore, the transmitter includes: an upper connector connected to a tubular pump, the tubular pump having a cable oil pipe anchor; a first main control circuit, a first central tube, and a first outer casing, the first main control circuit being installed within a closed-loop cavity formed between the first outer casing and the first central tube; the first main control circuit processing electrical energy and control signals converting them into DC carrier signals for electromagnetic coupling transmission; a first coupling component circumferentially mounted on the outer surface of the first central tube for receiving the DC carrier signals transmitted from the first main control circuit; a conduit for introducing electrical energy and communication signals sent from the ground controller into the first main control circuit via a single-core armored cable; a protective housing covering the outside of the first coupling component; and a guide head located at the lower end of the protective housing for guiding the transmitter and receiver to dock.

[0011] Furthermore, the first coupling component includes: two sets of first magnetic core coils, one set of magnetic core coils for wireless transmission of electrical energy and the other set of magnetic core coils for wireless transmission of signals; wherein the two sets of first magnetic core coils are respectively encapsulated and arranged circumferentially around the outer periphery of the first central tube to form a dual-channel electromagnetic induction coupling system to avoid interference between electrical energy transmission and signal transmission.

[0012] Furthermore, the receiving end includes: a connector connected to the transmitting end; a second main control circuit, a second central tube, and a second housing, wherein the second main control circuit is installed in a closed ring cavity formed between the second housing and the second central tube, and the second main control circuit controls the production execution mechanism to adjust the liquid volume of each layer according to the DC carrier signal received from the first main control circuit; a second coupling component, which is circumferentially installed on the inner surface of the second housing and is correspondingly arranged with the first coupling component, for receiving electrical energy and signals from the first coupling component and transmitting them to the second main control circuit; and a lower connector connected to the cable sealer.

[0013] Furthermore, the first and second central tubes are made of non-magnetic steel; the protective shell is made of polytetrafluoroethylene.

[0014] Furthermore, the second coupling component includes two sets of second magnetic core coils, which correspond to and are coupled to two sets of first magnetic core coils respectively, and the two sets of second magnetic core coils are used for the transmission of electrical energy and control signals.

[0015] The novel electromagnetic coupling intelligent stratified oil production connection structure applying this utility model includes: a surface controller, a production tubing string, and a distribution tubing string; the surface controller is connected to one end of a single-core cable; the production tubing string is connected to the other end of the single-core cable to receive the coupling signal transmitted by the surface controller; the distribution tubing string and the production tubing string are connected by a detachable drop-out tubing string structure, and the electromagnetic coupling principle is used to reliably transmit electrical energy and data to achieve separation and repeated docking between the two. This solves the problems of cumbersome operation processes, the need to completely remove the tubing string for pump inspection, and the tendency of tubing string creep to cause packer failure and reduced pump efficiency in existing technologies. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the connection process of a novel electromagnetic coupling intelligent stratified oil production connection structure, which is optional according to an embodiment of this utility model. Figure 2 This is a schematic diagram of the production tubing transmitter structure of a novel electromagnetic coupling intelligent stratified oil production connection structure, which can be optionally implemented according to an embodiment of this utility model. Figure 3 This is a schematic diagram of the receiving end structure of a production tubing of a novel electromagnetic coupling intelligent stratified oil production connection structure, which can be optionally implemented according to an embodiment of this utility model. Figure 4 This is a schematic diagram of a guide groove structure of a novel electromagnetic coupling intelligent stratified oil production connection structure, which is optional according to an embodiment of this utility model. The above figures include the following reference numerals: 10. Ground controller; 20. Production column; 21. Shearing rivet; 22. Transmitter; 221. Upper connector; 222. First main control circuit; 223. First central tube; 224. First outer shell; 225. First coupling assembly; 226. Through-line tube; 227. Protective shell; 228. Guide head; 30. Production distribution column; 31. Guide groove; 311. First vertical section; 312. Angled section; 313. Second vertical section; 32. Receiver; 321. Connector; 322. Second main control circuit; 323. Second central tube; 324. Second outer shell; 325. Second coupling assembly; 326. Lower connector. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] According to an embodiment of this utility model, a novel electromagnetic coupling intelligent stratified oil recovery connection structure is provided, such as... Figure 1 As shown, the system includes a ground controller 10, a production tubing 20, and a distribution tubing 30. The ground controller 10 is connected to one end of a single-core cable; the production tubing 20 is connected to the other end of the single-core cable and is used to receive electrical energy and control signals transmitted by the ground controller 10. The distribution tubing 30 is connected to the production tubing 20 using a detachable drop-off tubing structure, and uses the principle of electromagnetic coupling to reliably transmit electrical energy and data, thereby achieving separation and repeated docking between the two. This solves the problems of cumbersome operation processes, the need to completely remove the tubing during pump inspection, and the tendency of tubing creep to cause packer failure and reduced pump efficiency in existing technologies.

[0019] In specific implementation, such as Figure 2 and Figure 3 As shown, the production column 20 is provided with shearing rivets 21, and the end of the production column 30 is provided with a guide groove 31; wherein, the shearing rivets 21 are detachably embedded in the guide groove 31 to form the drop column structure, which has the advantages of reliable connection, accurate positioning and simple drop operation.

[0020] Furthermore, the guide groove 31 is configured as a U-shaped structure, with one end of the guide groove 31 being an open structure and the other end being a closed structure; the shear rivet 21 is embedded into the guide groove 31 through the open structure, and the shear rivet 21 slides to the closed structure to engage the production tube column 30 with the production tube column 20. This structural design not only facilitates centering guidance during assembly and ensures reliable connection, but also effectively prevents accidental detachment during operation. At the same time, it can be smoothly separated by lifting operation when dropped, combining the comprehensive advantages of good assembly guidance, stable connection, reliable anti-detachment, and controllable drop.

[0021] Specifically, such as Figure 4 As shown, the guide groove 31, from the open structure to the closed structure, includes, in sequence, a first vertical section 311, an inclined section 312, and a second vertical section 313. Both the first vertical section 311 and the second vertical section 313 are parallel to the central axis of the production tubing 30, while the inclined section 312 forms a preset angle with the central axis of the production tubing 30. The first vertical section 311 guides the shear rivet 21 to enter smoothly, ensuring initial alignment. The inclined section 312, as a transition section, generates radial force during assembly and release, which helps the shear rivet 21 slide into place and guides it to exit smoothly during lifting and separation, preventing jamming or seizing. The second vertical section 313, located at the closed end, accommodates the shear rivet 21 and ensures stable residence during operation, preventing accidental dislodgement. The preset angle of the inclined section 312 optimizes the force path, improves sliding performance, and makes the entire connection and separation process more controllable and reliable.

[0022] Furthermore, the production column 20 is provided with a transmitter 22 at the bottom and the distribution column 30 is provided with a receiver 32 at the top. When the production column 20 is inserted into the distribution column 30, the transmitter 22 and the receiver 32 are connected to wirelessly transmit electrical energy and control signals to the distribution column 30 through electromagnetic coupling.

[0023] Specifically, the transmitter 22 includes an upper connector 221, a first main control circuit 222, a first central tube 223, a first outer casing 224, a first coupling component 225, a cable conduit, a protective housing 226, and a guide head 227. The upper connector 221 is connected to a tubular pump, and the tubular pump is equipped with a cable oil pipe anchor. The first main control circuit 222 is installed in a closed ring cavity formed between the first outer casing 224 and the first central tube 223. The first main control circuit 222 processes electrical energy and control signals, converting them into power for use in electrical applications. The system includes a DC carrier signal transmitted via electromagnetic coupling; a first coupling component 225 circumferentially mounted on the outer surface of the first central tube 223 for receiving the DC carrier signal transmitted from the first main control circuit 222; a conduit for introducing electrical energy and communication signals sent from the ground controller 10 into the first main control circuit 222 via a single-core armored cable; a protective housing 226 covering the outside of the first coupling component 225; and a guide head 227 located at the lower end of the protective housing 226 for guiding the docking of the transmitter 22 and the receiver 32.

[0024] Optionally, the first coupling component 225 includes two sets of first core coils, one set of magnetic core coils for wireless transmission of electrical energy and the other set of magnetic core coils for wireless transmission of signals; wherein the two sets of first magnetic core coils are respectively encapsulated and arranged circumferentially around the outer periphery of the first central tube 223 to form a dual-channel electromagnetic induction coupling system to avoid interference between electrical energy transmission and signal transmission.

[0025] Furthermore, the receiving end 32 includes a connector 321, a second main control circuit 322, a second central tube 323, a second housing 324, a second coupling component 325, and a lower connector 326. The connector 321 is connected to the transmitting end 22. The second main control circuit 322 is installed in the closed ring cavity formed between the second housing 324 and the second central tube 323. The second main control circuit 322 controls the production execution mechanism to adjust the liquid volume of each layer according to the DC carrier signal from the first main control circuit 222. The second coupling component 325 is circumferentially installed on the inner surface of the second housing 324 and is correspondingly arranged with the first coupling component 225. It is used to receive electrical energy and signals from the first coupling component 225 and transmit them to the second main control circuit 322. The lower connector 326 is connected to the cable sealer.

[0026] Optionally, in this embodiment, the first central tube 223 and the second central tube 323 are made of non-magnetic steel to reduce the magnetic field shielding effect and improve the electromagnetic coupling efficiency; the protective shell 226 is made of polytetrafluoroethylene to take advantage of its excellent corrosion resistance, low coefficient of friction, good insulation performance and high temperature resistance to reduce the erosion and interference of the downhole environment on the equipment and improve the operational stability and long-term reliability of the electromagnetic coupling system.

[0027] Furthermore, the second coupling component 325 includes two sets of second magnetic core coils, which correspond to and are coupled to two sets of first magnetic core coils respectively. The two sets of second magnetic core coils are used for the transmission of electrical energy and control signals. This transmission method can effectively suppress external electromagnetic interference, improve the anti-interference capability and reliability of signal transmission, and ensure that the downhole production actuator accurately receives control commands.

[0028] In practical use, the user first assembles the production string 20 and the distribution string 30 on the ground, aligning the shear rivets 21 on the production string 20 with the opening structure of the guide groove 31 at the end of the distribution string 30, and then pushes the two strings axially, causing the shear rivets 21 to embed from the opening and slide sequentially through the first vertical section 311, the inclined section 312, and finally into the closed end of the second vertical section 313 to complete the engagement, forming a stable drop string structure. Simultaneously, the transmitting end 22 at the bottom of the production string 20 is inserted into the receiving end 32 at the top of the distribution string 30, and precise alignment is achieved through the guide head 227, ensuring that the first coupling component 225 of the transmitting end 22 and the second coupling component 325 of the receiving end 32 are positioned opposite each other, forming an electromagnetic coupling channel. The assembled string is then lowered into the well to the target oil layer, and the cable packer is set to achieve interlayer isolation. The ground controller 10 transmits electrical energy and communication signals through a single-core armored cable to the first main control circuit 22 of the transmitting end 22. 2. After processing, a DC carrier signal is generated and transmitted to two independent magnetic cores and coils in the first coupling component 225 for power transmission and signal transmission, respectively, forming a dual-channel electromagnetic induction coupling system to avoid interference. The signal is transmitted to the second coupling component 325 in the production string 30 through magnetic field coupling, and then transmitted to the second main control circuit 322 to supply power and transmit control commands. The second main control circuit 322 drives the production execution mechanism to perform precise adjustment of the liquid volume in different layers, realizing intelligent stratified oil production. During the operation, the operating status can be monitored in real time and parameters can be dynamically adjusted to ensure efficient and stable production. When it is necessary to pull out the upper tubing, the production tubing 20 is pulled up. Under the direct action of the tension, the shear rivet 21 is broken, causing the production tubing 20 to separate from the production string 30, completing the release operation. The production tubing 20 can be pulled out for maintenance or replacement, while the production string 30 and the packer remain downhole to continue working, supporting subsequent repeated docking and long-term intelligent oil production operations.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel connection structure for electromagnetically coupled intelligent stratified oil recovery, characterized in that, include: Ground controller (10), which is connected to one end of a single-core cable; Production column (20), which is connected to the other end of a single-core cable, is used to receive electrical energy and control signals transmitted by the ground controller (10); The production supply column (30) is connected to the production column (20) by a detachable drop-off column structure, and uses the electromagnetic coupling principle to reliably transmit electrical energy and data, so as to realize the separation and repeated docking between the two.

2. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 1, characterized in that, The production column (20) is provided with shearing rivets (21), and the end of the distribution column (30) is provided with a guide groove (31). The shearing rivet (21) is detachably embedded in the guide groove (31) to form the drop tube column structure.

3. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 2, characterized in that, The guide groove (31) is configured as a U-shaped structure, with one end of the guide groove (31) being an open structure and the other end of the guide groove (31) being a closed structure; the shear rivet (21) is embedded into the guide groove (31) from the open structure, and the shear rivet (21) slides to the closed structure to engage the production tube column (30) with the production tube column (20).

4. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 3, characterized in that, The guide groove (31) includes, in sequence from the open structure to the closed structure: a first vertical section (311), an oblique section (312), and a second vertical section (313). The first vertical segment (311) and the second vertical segment (313) are both parallel to the central axis of the production line (30), and the inclined segment (312) forms a preset angle with the central axis of the production line (30).

5. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 1, characterized in that, The production tube (20) is provided with a transmitter (22) at the bottom and the distribution tube (30) is provided with a receiver (32) at the top. When the production tube (20) is inserted into the distribution tube (30), the transmitter (22) and the receiver (32) are connected to wirelessly transmit electrical energy and control signals to the distribution tube (30) through electromagnetic coupling.

6. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 5, characterized in that, The transmitter (22) includes: The upper connector (221) is connected to the tubular pump, and the tubular pump is equipped with a cable oil pipe anchor. The system comprises a first main control circuit (222), a first central tube (223), and a first housing (224). The first main control circuit (222) is installed in a closed ring cavity formed between the first housing (224) and the first central tube (223). The first main control circuit (222) processes electrical energy and control signals and converts them into DC carrier signals for electromagnetic coupling transmission. The first coupling component (225) is circumferentially mounted on the outer surface of the first central tube (223) and is used to receive the DC carrier signal transmitted from the first main control circuit (222).

7. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 6, characterized in that, The first coupling component (225) includes: Two sets of first magnetic core coils, one set of magnetic core coils is used to realize wireless transmission of electrical energy, and the other set of magnetic core coils is used to realize wireless transmission of signals; Among them, the two sets of first magnetic core coils are respectively encapsulated and arranged circumferentially on the outer periphery of the first central tube (223).

8. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 7, characterized in that, The receiving end (32) includes: Connector (321), which is connected to the transmitter (22); The second main control circuit (322), the second central tube (323), and the second outer casing (324) are installed in a closed ring cavity formed between the second outer casing (324) and the second central tube (323). The second main control circuit (322) controls the production execution mechanism to adjust the liquid volume of the layer according to the DC carrier signal received from the first main control circuit (222). The second coupling component (325) is circumferentially mounted on the inner surface of the second housing (324) and is correspondingly disposed with respect to the first coupling component (225). It is used to receive electrical energy and signals from the first coupling component (225) and transmit them to the second main control circuit (322). The lower connector (326) is connected to the cable packer.

9. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 8, characterized in that, The first central tube (223) and the second central tube (323) are made of non-magnetic steel.

10. The novel electromagnetic coupling intelligent stratified oil recovery connection structure according to claim 8, characterized in that, The second coupling component (325) includes: Two sets of second magnetic core coils are provided, each corresponding to and coupled to two sets of first magnetic core coils. The two sets of second magnetic core coils are used for the transmission of electrical energy and control signals.

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