A downhole magnetic levitation controllable self-powering water injection device and method

Abstract

The application discloses a downhole magnetic suspension controllable self-power-generating water injection device and a water injection method. The water injection device comprises a top joint, a shell and a middle joint which are sequentially connected, the top joint is provided with a water injection port, and the middle joint is provided with a water outlet groove; the shell is provided with an electrical cavity and a medium cavity; the medium cavity is provided with a power generation module, the power generation module comprises a fluid type magnetic suspension impeller generator, and a liquid inlet of the power generation module is communicated with the medium cavity; a flow regulating nipple is arranged between the medium cavity and the water outlet groove; the electrical cavity is provided with a battery and a control circuit, and the control circuit is used for: when it is monitored that the battery power is too low, controlling the flow regulating nipple to connect a liquid outlet of the power generation module and the water outlet groove and cut off the medium cavity and the water outlet groove; and when it is monitored that the battery is fully charged, controlling the flow regulating nipple to connect the medium cavity and the water outlet groove and cut off the liquid outlet of the power generation module and the water outlet groove. The device realizes self-power supply and energy management of downhole equipment.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology, and in particular to a downhole magnetic levitation controllable self-generating water injection device and water injection method. Background Technology

[0002] In modern oil and gas field development, water injection wells are widely used to maintain formation pressure and enhance oil recovery. With the increasing prevalence of intelligent downhole tools, such as pressure sensors, data acquisition modules, and communication units, the issue of downhole power supply has become increasingly prominent. Traditional solutions rely on surface power or disposable batteries, which present problems such as complex wiring, difficult maintenance, high costs, and environmental pollution.

[0003] In recent years, utilizing water flow during water injection to drive micro-generators for on-site energy harvesting has become a research hotspot. Among them, fluid-type magnetic levitation impeller generators are suitable for energy capture in downhole low-power environments due to their characteristics of no mechanical contact, low starting resistance, and long lifespan. However, because their output power is small and greatly affected by fluid conditions, they require a high-efficiency energy management system to improve overall efficiency. Summary of the Invention

[0004] To enrich product types, process routes, and options, this invention provides a downhole magnetic levitation controllable self-generating water injection device and method, realizing autonomous power supply and energy management for downhole equipment.

[0005] In a first aspect, embodiments of the present invention provide a downhole magnetically levitated controllable self-generating water injection device, comprising an upper connector, a housing, and an intermediate connector connected in sequence, wherein the upper connector is provided with a water injection port, and the intermediate connector is provided with a water outlet groove for injecting water into the formation; characterized in that the housing is provided with an electrical cavity and a dielectric cavity.

[0006] A power generation module is installed inside the medium cavity, including a fluid-type magnetic levitation impeller generator, which is used to convert the kinetic energy of the fluid in the medium cavity into electrical energy. The liquid inlet of the power generation module is connected to the medium cavity.

[0007] A flow regulation section is provided between the medium chamber and the water outlet tank;

[0008] The electrical cavity is equipped with a battery and a control circuit. The control circuit is used to: detect that the battery power is lower than a set threshold, control the flow regulating short section to connect the liquid outlet of the power generation module and the water outlet tank, and cut off the medium cavity and the water outlet tank; detect that the battery is fully charged, control the flow regulating short section to connect the medium cavity and the water outlet tank, and cut off the liquid outlet of the power generation module and the water outlet tank.

[0009] Optionally, the control circuit, after controlling the flow regulating section to connect the liquid outlet of the power generation module and the water outlet tank, and to cut off the medium chamber and the water outlet tank, is also used for:

[0010] The MPPT algorithm is used to dynamically adjust the generator load so that the generator operates at its maximum power output point.

[0011] Optionally, the operating modes of the control circuit include a sleep mode and an operating mode;

[0012] When the control circuit is in sleep mode, it is used to detect the current power of the battery at a first set interval and determine whether the current power of the battery is lower than a set threshold. If so, it enters working mode and determines whether the current flow rate in the medium cavity meets the power generation requirements. If so, it controls the flow regulating section to connect the liquid outlet of the power generation module and the water outlet tank, and cuts off the medium cavity and the water outlet tank.

[0013] When the control circuit is in working mode, it is also used to detect the current power of the battery at a second set interval to determine whether it is fully charged; if so, it controls the flow regulating section to connect the medium chamber and the water outlet tank, and cuts off the liquid outlet of the power generation module and the water outlet tank, thus entering sleep mode.

[0014] Optionally, the control circuit determines whether the current flow rate in the medium cavity meets the power generation requirements, for the following purposes:

[0015] Determine whether the current flow rate in the medium cavity is greater than the minimum flow rate threshold and less than the maximum flow rate threshold.

[0016] Optionally, an electrical frame may also be included;

[0017] The electrical skeleton is located inside the housing. The electrical skeleton and the upper connector form an isolated electrical cavity and a liquid injection channel. The electrical skeleton and the intermediate connector form a medium cavity. The water injection port is connected to the medium cavity through the liquid injection channel.

[0018] Optionally, the flow regulating section includes a stationary valve sleeve and a moving valve core;

[0019] The static valve sleeve is fixedly connected to the intermediate joint, and forms a liquid outlet chamber between the static valve sleeve and the intermediate joint. The liquid outlet chamber is connected to the liquid outlet and the water outlet tank. The static valve sleeve is provided with a valve chamber and a water outlet. The valve chamber is provided with multiple radial water nozzles in its circumferential direction for connecting the medium chamber, the water outlet and the liquid outlet chamber respectively. The water outlet is connected to the water outlet tank.

[0020] The moving valve core is located inside the valve cavity. When the moving valve core rotates to the point where the medium cavity is connected to the water outlet, the medium cavity and the water outlet tank are connected, the liquid outlet of the power generation module and the water outlet tank are cut off, and the water injection device is in the water injection state. When the moving valve core rotates to the point where the liquid outlet cavity is connected to the water outlet, the liquid outlet of the power generation module and the water outlet tank are connected, the medium cavity and the water outlet tank are cut off, and the water injection device is in the power generation state.

[0021] Optionally, the valve chamber of the flow regulating section is provided with four radial water nozzles arranged in a cross shape, the moving valve core is T-shaped, and there are two water outlets. When the water injection device is in the water injection state, the moving valve core connects the two water outlets and the medium chamber; when the water injection device is in the power generation state, the moving valve core connects the two water outlets and the liquid outlet chamber.

[0022] Optionally, when the moving valve core rotates to any position where the four radial water nozzles are not connected, the water injection device is in a completely blocked state.

[0023] Optionally, the flow regulating section further includes a motor, which is encapsulated in the first pipe and connected to the moving valve core via a universal joint, for driving the rotation of the moving valve core.

[0024] Optionally, the power generation module is provided with a second pipe, and the generator is encapsulated within the second pipe.

[0025] Optionally, the electrical frame is provided with a conduit, and the wires of the flow regulating section and the power generation module are both passed through the conduit.

[0026] Optionally, it also includes a support rod, which is disposed in the medium cavity, and the two ends of the support rod are respectively connected to the intermediate joint and the electrical frame.

[0027] Secondly, embodiments of the present invention provide a downhole magnetic levitation controllable self-generating water injection method, which utilizes the control circuit of any of the downhole magnetic levitation controllable self-generating water injection devices described above, and performs self-generating power generation and water injection control through the following steps:

[0028] If the battery charge is detected to be below a set threshold, the flow regulating switch is controlled to connect the liquid outlet of the power generation module and the water outlet tank, while cutting off the medium chamber and the water outlet tank, so that the water injection device enters the power generation state; if the battery is detected to be fully charged, the flow regulating switch is controlled to connect the medium chamber and the water outlet tank, while cutting off the liquid outlet of the power generation module and the water outlet tank, so that the water injection device enters the water injection state.

[0029] Optional, also includes:

[0030] The moving valve core of the flow regulating section is rotated to a position where the four radial water nozzles are not connected, so that the water injection device enters the flow throttling state.

[0031] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0032] (1) The downhole magnetic levitation controllable self-generating water injection device provided in this embodiment of the invention can convert the water flow energy in the medium cavity into electrical energy through the setting of the power generation module and the flow regulation section, so as to realize the self-generating power supply of downhole tools, extend or even avoid the replacement of downhole power supply equipment, solve the problem of long-term downhole power supply, and improve the service life of water injection tools.

[0033] (2) The downhole magnetic levitation controllable self-generating water injection device provided in this embodiment of the invention can start the charging mode when the power generation module has low power through the control circuit, inject water into the medium cavity, and connect the liquid outlet and water outlet tank of the power generation module by controlling the flow regulating short section, while cutting off the medium cavity and water outlet tank. The water in the medium cavity can flow into the power generation module for controllable power generation, realizing the self-generated power supply of the downhole tool; when the power generation is completed, the medium cavity and water outlet tank are connected by controlling the flow regulating short section for controllable water injection. At the same time, the intelligent switching between power generation and water injection states extends the service life of the generator impeller and reduces unnecessary mechanical wear.

[0034] (3) The downhole magnetic levitation controllable self-generating water injection device provided in this embodiment of the invention improves the energy utilization rate of the micro-power generator due to the low starting energy of the fluid magnetic levitation impeller generator, especially under low flow velocity conditions. Moreover, the impeller adopts a magnetic levitation structure, which reduces friction loss and adapts to the high pressure and high temperature environment downhole.

[0035] (4) The downhole magnetic levitation controllable self-generating water injection device provided in the embodiments of the present invention arranges the control circuit and battery above the generator to minimize the length of the wires and reduce the problems caused by sealing; the flow regulation section not only controls the start and stop of the generator, but also controls the amount of water injected into different layers, and is arranged below to facilitate connection with the downhole tools (such as packers) below.

[0036] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0037] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0038] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0039] Figure 1 This is a schematic diagram of the overall structure of the downhole magnetic levitation controllable self-generating water injection device provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the water injection device (with a transparent outer shell) provided in an embodiment of the present invention;

[0041] Figure 3 The electrical framework of the water injection device provided in this embodiment of the invention is along... Figure 2 A schematic diagram of the structure in the direction of observation;

[0042] Figure 4 This is a schematic diagram of the assembly structure of the flow regulating section and the intermediate joint in the water injection device provided in the embodiment of the present invention;

[0043] Figure 5 The static valve sleeve of the flow regulating short section in the water injection device provided in this embodiment of the invention is... Figure 2 A schematic diagram of the structure in the direction of observation;

[0044] Figure 6 This is a schematic diagram of the switching position of the flow regulation section of the water injection device provided in the embodiment of the present invention when it is in power generation mode;

[0045] Figure 7 This is a schematic diagram showing the switching position of the flow regulating section of the water injection device provided in the embodiment of the present invention during the water injection state;

[0046] Figure 8 This is a schematic diagram of the switching position of the flow regulating section of the water injection device provided in the embodiment of the present invention when the flow is cut off;

[0047] Figure 9 This is a circuit topology diagram of the water injection device provided in an embodiment of the present invention.

[0048] Figure 1-8 Components: 1. Upper connector; 11. Water inlet; 2. Outer shell; 3. Intermediate connector; 31. Water outlet trough; 32. Liquid outlet chamber; 33. Sealing ring; 4. Electrical frame; 41. Electrical cavity; 42. Liquid inlet channel; 43. Medium cavity; 44. Conduit; 5. Power generation module; 51. Liquid inlet; 52. Liquid outlet; 53. Second pipe; 6. Flow regulating sub; 61. Static valve sleeve; 611. Valve cavity; 612. Water outlet; 613. Radial nozzle; 614. Conduit hole; 62. Moving valve core; 63. First pipe; 64. Universal joint; 7. Support rod. Detailed Implementation

[0049] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0050] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0051] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0052] In the description of this invention, it should be noted that the terms "comprising", "including", "having", "containing", etc., are all open-ended terms, meaning that they include but are not limited to.

[0053] Example

[0054] like Figures 1-8 As shown in the figure, the downhole magnetic levitation controllable self-generating water injection device provided in this embodiment of the invention includes an upper connector 1, a housing 2, and an intermediate connector 3 connected in sequence. The upper connector 1 is provided with a water injection port 11, and the intermediate connector 3 is provided with a water outlet channel 31. The intermediate connector 3 is used to connect downhole tools. The water outlet channel 31 provided in the intermediate connector 3 is used to inject water into the formation. The water injected through the water injection port 11 flows out through the water outlet channel 31 to achieve the stratified water injection requirement.

[0055] The outer casing 2 of the water injection device is provided with an electrical cavity 41 and a medium cavity 43; the medium cavity 43 is provided with a power generation module 5, including a fluid magnetic levitation impeller generator (not shown in the figure), which is used to convert the kinetic energy of the fluid in the medium cavity 43 into electrical energy. The liquid inlet 51 of the power generation module 5 is connected to the medium cavity 43, and the liquid outlet 52 of the power generation module 5 is connected to or cut off from the water outlet tank 31.

[0056] A flow regulating section 6 is provided between the medium chamber 43 and the outlet tank 31.

[0057] The electrical cavity 41 contains a battery and a control circuit (not shown in the figure). The control circuit is used to: detect that the battery charge is lower than a set threshold, control the flow regulating section 6 to connect the liquid outlet 52 and the water outlet tank 31 of the power generation module 5, and cut off the medium cavity 43 and the water outlet tank 31; detect that the battery is fully charged, control the flow regulating section 6 to connect the medium cavity 43 and the water outlet tank 31, and cut off the liquid outlet 52 and the water outlet tank 31 of the power generation module 5.

[0058] The battery can be a lithium-ion battery, a nickel-metal hydride battery, or other rechargeable battery pack, used to store electrical energy generated by the generator to power downhole tools. Additionally, a battery protection circuit is included to prevent overcharging, over-discharging, short circuits, etc.

[0059] In some embodiments, the water injection device further includes an electrical frame 4, which is disposed inside the housing 2. An electrical cavity 41 and a liquid injection channel 42 are formed between the electrical frame 4 and the upper connector 1, and a medium cavity 43 is formed between the electrical frame 4 and the intermediate connector 3. The water injection port 11 is connected to the medium cavity 43 through the liquid injection channel 42.

[0060] like Figure 2 As shown, the electrical cavity 41 is an annular cavity structure located between the outer wall of the injection channel 42 and the inner wall of the outer shell 2. Water flows through the injection channel 42. The electrical frame 4 is sealed to the inner wall of the outer shell 2, dividing the interior of the outer shell 2 into two sections along the axial direction, namely the electrical cavity 41 and the medium cavity 43. The electrical cavity 41 between the upper connector 1 and the electrical frame 4 is used to house electrical components such as batteries, control circuits, and wires, thereby realizing the encapsulation of electrical components and improving electrical reliability.

[0061] like Figure 2 As shown, the power generation module 5 and the flow regulating section 6 are both located inside the housing 2 between the electrical frame 4 and the intermediate connector 3. The power generation module 5 and the flow regulating section 6 are both eccentrically located inside the housing 2. In this embodiment, there are two flow regulating sections 6, which are located on both sides of the power generation module 5. During normal water filling, the water entering through the water inlet 11 enters the medium chamber 43 through the liquid injection channel 42 and flows out through the water outlet 31 of the intermediate connector 3.

[0062] The downhole magnetic levitation controllable self-generating water injection device provided in this embodiment, by setting up a power generation module 5 and a flow regulating section 6, can regulate the water injected into the medium cavity 43 through the flow regulating section 6. By controlling the connection or disconnection between the medium cavity 43 and the water outlet 31, the water in the medium cavity 43 can enter the power generation module 5. The power generation module 5 converts the energy of water flow into electrical energy, realizing the self-generating power supply of downhole tools, thereby extending or even avoiding the replacement of downhole power supply equipment, solving the problem of long-term downhole power supply, and improving the service life of water injection tools.

[0063] The downhole magnetic levitation controllable self-generating water injection device provided in this embodiment of the invention, through a control circuit, can activate a charging mode when the power generation module's power is low, injecting water into the medium chamber 43. By controlling the flow regulating section 6, the liquid outlet 52 of the power generation module 5 and the water outlet 31 are connected, while the medium chamber 43 and the water outlet 31 are cut off. Water in the medium chamber 43 can then flow into the power generation module 5 for controllable power generation, realizing self-generated power supply for the downhole tool. After power generation ends, the flow regulating section 6 is used to connect the medium chamber 43 and the water outlet 31 for controllable water injection. Simultaneously, the intelligent switching between power generation and water injection states extends the service life of the generator impeller and reduces unnecessary mechanical wear.

[0064] The downhole magnetic levitation controllable self-generating water injection device provided in this embodiment of the invention improves the energy utilization rate of the micro-power generator due to the low starting energy of the fluid-type magnetic levitation impeller generator, especially under low flow velocity conditions, it can still effectively capture energy. At the same time, the impeller adopts a magnetic levitation structure, which reduces friction loss and adapts to the high pressure and high temperature environment downhole.

[0065] The downhole magnetic levitation controllable self-generating water injection device provided in this embodiment of the invention arranges the control circuit and battery above the generator to minimize the length of the wires and reduce the problems caused by sealing; the flow regulation section 6 not only controls the start and stop of the generator, but also controls the amount of water injected into different layers, and is arranged below to facilitate connection with downhole tools (such as packers) below.

[0066] like Figure 2 As shown, the power generation module 5 is provided with multiple liquid inlets 51 around its circumference. The liquid inlets 51 are connected to the medium cavity 43. When the medium cavity 43 and the water outlet tank 31 are cut off by the flow regulating section 6, the water in the medium cavity 43 enters the power generation module 5 through the liquid inlets 51.

[0067] Optionally, the flow regulating section 6 includes a stationary valve sleeve 61 and a moving valve core 62. The stationary valve sleeve 61 is fixedly connected to the intermediate joint 3 (such as by bonding or mechanical connection) and forms an outlet chamber 32 between the stationary valve sleeve 61 and the intermediate joint 3. The outlet chamber 32 connects to the outlet 52 and the water outlet 31. The stationary valve sleeve 61 is provided with a valve chamber 611 and an outlet 612. The valve chamber 611 is provided with multiple radial water nozzles 613 in the circumference for connecting the medium chamber 43, the outlet 612 and the outlet chamber 32 respectively. The outlet 612 is connected to the water outlet 31. The movable valve core 62 is rotatably disposed in the valve cavity 611. When the movable valve core 62 rotates to the point where the medium cavity 43 is connected to the water outlet 612, the medium cavity 43 and the water outlet 31 are connected, the liquid outlet 52 of the power generation module 5 and the water outlet 31 are cut off, and the water injection device is in the water injection state; when the movable valve core 62 rotates to the point where the liquid outlet 32 ​​is connected to the water outlet 612, the liquid outlet 52 of the power generation module 5 and the water outlet 31 are connected, the medium cavity 4 and the water outlet 31 are cut off, and the water injection device is in the power generation state.

[0068] like Figure 2 and Figure 4 As shown, the outer diameter of the static valve sleeve 61 is smaller than the inner diameter of the outer shell 2. Two sealing rings 33 are spaced apart between the intermediate connector 3 and the inner wall of the outer shell 2. The two sealing rings 33 abut against the inner wall of the outer shell 2 to achieve isolation, thereby forming an outlet chamber 32 between the two sealing rings 33. The outlet 52 of the power generation module 5 is located on the valve sleeve and communicates with the outlet chamber 32. The outlet chamber 32 of the static valve sleeve 61 is connected to the outlet groove 31 of the intermediate connector 3 through the outlet 612. By rotating the moving valve core 62 in the valve chamber 611, the communication state between the medium chamber 43, the outlet chamber 32 and the outlet 612 can be adjusted to achieve controllable power generation, controllable water injection and complete interception. Figure 4 and Figure 5 In this embodiment, each static valve sleeve 61 is provided with two valve chambers 611 and correspondingly with two moving valve cores 62, which facilitates increasing the number of water outlets 612 and improving the water flow adjustment range to meet the needs of large-flow water injection. In order to effectively connect the liquid outlet chamber 32 and the liquid outlet 52, the outer wall of the static valve sleeve 61 is provided with grooves to increase connectivity.

[0069] Optionally, at least two flow regulating sections 6 are provided, each flow regulating section 6 corresponds to a valve chamber 611, each valve chamber 611 is provided with four radial water nozzles 613, the four radial water nozzles 613 are arranged in a cross shape, the moving valve core 62 is T-shaped, each valve chamber 611 is provided with two water outlets 612 for communication, in the water injection state, the moving valve core 62 connects the two water outlets 612 and the medium chamber 43; in the power generation state, the moving valve core 62 connects the two water outlets 612 and the liquid outlet chamber 32.

[0070] like Figure 4 and Figure 5Two outlets 612 are positioned opposite each other and connected to two oppositely positioned radial nozzles 613. The other two oppositely positioned radial nozzles 613 are connected to the medium chamber 43 and the liquid outlet chamber 32, respectively. The three channels of the moving valve core 62 are vertically intersecting to form a T-shaped channel, which can rotatably connect to each radial nozzle 613. In power generation mode, such as... Figure 6 The three channels of the moving valve core 62 are respectively connected to the liquid outlet chamber 32 and the two water outlets 612. The medium chamber 43 is cut off, so the water in the medium chamber 43 will enter the power generation module 5 to generate electricity. The water after power generation is discharged from the liquid outlet 52 of the power generation module 5. Figure 4 Since the outlet 52 is connected to the outlet chamber 32, and the outlet chamber 32 is connected to the outlet 612, the discharged water will eventually be discharged through the outlet chamber 32, the outlet 612, and the outlet tank 31, thus achieving drainage after power generation. It can be understood that by adjusting the communication area between the channel of the adjustable valve core 62 and the outlet chamber 32, controllable regulation of the water used for power generation can be achieved, enabling controllable power generation. Similarly, in the water injection state, as... Figure 7 The moving valve core 62 rotates to connect its three channels to the medium chamber 43 and the two water outlets 612 respectively. The water in the medium chamber 43 is directly injected into the water outlet 31 through the two water outlets 612. By adjusting the connection area between the channel of the moving valve core 62 and the medium chamber 43, the amount of water injected can be adjusted to achieve controllable water injection.

[0071] Optionally, such as Figure 8 When the moving valve core 62 rotates to any position where it is not connected among the four radial water nozzles 613, the water injection device is in a completely shut-off state. At this time, all three channels of the moving valve core 62 are located between any two radial water nozzles 613 and abut against the inner wall of the valve chamber 611. The medium chamber 43, the liquid outlet chamber 32, and the water outlet 612 are not connected. It cannot generate electricity or inject water. The controllable self-generating water injection tool is in a completely shut-off state, realizing controllable adjustment and control of the water injection process.

[0072] Optionally, the flow regulating section 6 also includes a motor, which is encapsulated in the first pipe 63 and connected to the moving valve core 62 via a universal joint 64 to drive the rotation of the moving valve core 62.

[0073] like Figure 2 As shown, the moving valve core 62 is driven to rotate by a motor, thereby achieving automatic control and precise rotational position control of the moving valve core 62. The motor and other electrical components are encapsulated within the first conduit 63 for electrical isolation and protection. The motor is positioned near the electrical frame 4; alternatively, the motor can be housed within the electrical cavity 41. The motor's output end is connected to a universal joint 64 at the end of the first conduit 63, and the moving valve core 62 is connected via the universal joint 64 for drive and installation.

[0074] Optionally, the power generation module 5 is provided with a second pipe 53, and the generator is encapsulated within the second pipe 53.

[0075] like Figure 2 As shown, the generator is used to generate electricity, converting the energy of water flow into electrical energy and storing it in a battery, also known as a secondary battery. After charging, the battery can meet the power needs of downhole tools. The battery has a wireless communication connection with the ground, allowing it to upload its power status in real time. This enables the generator module 5 to be activated when the power is low, achieving self-powering downhole operations. Figure 2 and Figure 3 The two ends of the second pipe 53 are respectively sealed and connected to the electrical frame 4 and the intermediate joint 3 to achieve reliable electrical isolation.

[0076] Optionally, the electrical frame 4 is provided with a conduit 44, and the wires of the flow regulating section 6 and the power generation module 5 are all passed through the conduit 44.

[0077] like Figure 2 and Figure 3 As shown, the first pipe 63 and the second pipe 53 are both sealed connections between the electrical frame 4. The conduit 44 is located inside the electrical cavity 41, and both ends of the conduit 44 are sealed connections to the electrical frame 4 and the upper connector 1, respectively. This allows the wires of the flow regulating section 6 and the power generation module 5 to be passed through the conduit 44 to achieve media isolation. Furthermore, as... Figure 5 As shown, the static valve sleeve 61 is provided with a wire hole 614 for the electrical connection between the power generation module 5 and the downhole tool. Therefore, a wire conduit 44 can be installed at the wire hole 614 to pass through the electrical cavity 41 and the medium cavity 43 and then be sealed to the wire hole 614 to achieve isolation and protection of the wire.

[0078] Optionally, the controllable self-generating water injection tool also includes a support rod 7, which is located inside the medium cavity 43, and its two ends are respectively connected to the intermediate joint 3 and the electrical frame 4.

[0079] like Figure 2 and Figure 3 The two ends of the support rod 7 are fixedly connected to the electrical frame 4 and the intermediate connector 3, respectively, to support and limit the electrical frame 4. The number of support rods 7 is not limited to one; two or more support rods 7 can be set in the space of the outer casing 2 as needed to install and fix the electrical frame 4.

[0080] In addition, in this embodiment, the upper connector 1 is threaded to the outer shell 2 and sealed with an O-ring. The outer shell 2 and the intermediate connector 3 are connected by a pin and also sealed with an O-ring. The upper connector 1 is sealed to the electrical frame 4, and the outer shell 2 is sealed to the electrical frame 4. Thus, an electrical cavity 41 is formed between the upper connector 1 and the electrical frame 4. The sealed connection between the power generation module 5 and the electrical frame 4 allows the wires of the power generation module 5, i.e. the electrical leads, to pass through the electrical cavity 41.

[0081] The control circuit in this embodiment can be based on an embedded controller MCU, such as the ARM Cortex-M series. See [link / reference needed]. Figure 9 The diagram shown is a circuit topology diagram. The main functions of the control circuit include:

[0082] (1) Real-time acquisition of generator speed, voltage, current, and output power;

[0083] (2) Monitor battery voltage, input / output current, and remaining capacity (SOC);

[0084] (3) Control the switching and opening degree of the flow regulating stub 6 and the valve core 62;

[0085] (4) Execute the Maximum Power Point Tracking (MPPT) algorithm to optimize charging efficiency;

[0086] (5) Determine the battery status and automatically switch the fluid path;

[0087] (6) After the battery is fully charged, it enters low power mode and retains only basic monitoring functions;

[0088] (7) Supports remote communication interfaces (such as RS-485, UART, etc.) to facilitate data transmission and control.

[0089] The control circuit operates in two modes: sleep mode and active mode. The control logic flow is as follows:

[0090] The control circuit is initially in a low-power sleep mode, periodically waking up to check the battery level. Specifically, it checks the current battery level at a first set interval and determines whether the current battery level is below a set threshold (e.g., 80%). If so, it enters the working mode and determines whether the current flow rate in the medium cavity 43 meets the power generation requirements. If it does, it controls the flow regulating section 6 to connect the liquid outlet 52 of the power generation module 5 and the water outlet tank 31, and cuts off the medium cavity 43 and the water outlet tank 31. It then enters the working state and uses the MPPT algorithm to dynamically adjust the generator load so that the generator works at the maximum power output point.

[0091] Optionally, if it is determined that the current flow rate in the medium cavity 43 does not meet the power generation requirements, communication with the ground can be established, and the injection flow rate can be adjusted if construction conditions permit, so that the flow rate in the medium cavity 43 meets the power generation requirements.

[0092] Furthermore, the current flow rate within the medium cavity 43 is greater than the minimum flow rate threshold and less than the maximum flow rate threshold, thus confirming that the flow rate meets the power generation requirements. The minimum flow rate threshold is the minimum starting flow rate for the generator; that is, if the flow rate is less than this value, the generator cannot start. The maximum flow rate threshold is the maximum flow rate at which the generator can operate effectively; that is, if the flow rate is greater than this value, the generator cannot generate electricity normally.

[0093] When the control circuit is in working mode, it is also used to detect the current battery power at the second set interval to determine whether the charging is complete (e.g., the power reaches 95%). If so, the control flow regulating section connects the medium chamber 43 and the water outlet 31, and cuts off the liquid outlet 52 of the power generation module 5 and the water outlet 31. The control circuit enters the sleep mode, and the entire water injection device enters the water injection state.

[0094] The electrical connection methods of the various electrical components of the water injection device provided in this embodiment include:

[0095] 1. The generator output is connected to the control circuit via a rectifier and voltage regulator circuit;

[0096] 2. The battery is connected to the control circuit via a BMS (Battery Management System);

[0097] 3. The control circuit controls the movement of the moving valve core actuator via a PWM signal;

[0098] 4. The sensor signal is acquired by the ADC and then sent to the MCU for processing;

[0099] 5. A communication interface is optional, used for data return and remote control.

[0100] This invention also provides a downhole magnetic levitation controllable self-generating water injection method. The downhole magnetic levitation controllable self-generating water injection device provided in the above embodiment is installed in a downhole water injection pipeline. Using the control circuit of the water injection device, self-generating power and water injection control are performed through the following steps:

[0101] When the battery charge is detected to be lower than the set threshold, the flow regulating section 6 is controlled to connect the liquid outlet 52 and the water outlet tank 31 of the power generation module 5, and to cut off the medium chamber 43 and the water outlet tank 31, so that the water injection device enters the power generation state; when the battery is detected to be fully charged, the flow regulating section 6 is controlled to connect the medium chamber 43 and the water outlet tank 31, and to cut off the liquid outlet 52 and the water outlet tank 31 of the power generation module 5, so that the water injection device enters the water injection state.

[0102] It may also include:

[0103] The moving valve core 62 of the flow regulating section 6 is rotated to any position where the four radial water nozzles 613 are not connected, so that the water injection device enters the interception state.

[0104] This invention achieves flexible control of the water injection process by setting up a control circuit, a flow regulating section 6, and a power generation module 5. The relative rotation position of the moving valve core 62 in the flow regulating section 6 within the stationary valve sleeve 61 is controlled to achieve controllable power generation, controllable water injection, or complete flow cutoff. The control method is simple and easy to implement.

[0105] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0106] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0107] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A downhole magnetically levitated controllable self-generating water injection device, comprising an upper connector, a housing, and an intermediate connector connected in sequence, wherein the upper connector is provided with a water injection port, and the intermediate connector is provided with a water outlet groove for injecting water into the formation; characterized in that, The outer casing contains an electrical cavity and a dielectric cavity; A power generation module is installed inside the medium cavity, including a fluid-type magnetic levitation impeller generator, which is used to convert the kinetic energy of the fluid in the medium cavity into electrical energy. The liquid inlet of the power generation module is connected to the medium cavity. A flow regulation section is provided between the medium chamber and the water outlet tank; The electrical cavity is equipped with a battery and a control circuit. The control circuit is used to: detect that the battery power is lower than a set threshold, control the flow regulating short section to connect the liquid outlet of the power generation module and the water outlet tank, and cut off the medium cavity and the water outlet tank; detect that the battery is fully charged, control the flow regulating short section to connect the medium cavity and the water outlet tank, and cut off the liquid outlet of the power generation module and the water outlet tank. The flow regulating section includes a stationary valve sleeve and a moving valve core. The stationary valve sleeve is fixedly connected to the intermediate joint, forming a liquid outlet chamber between them. The liquid outlet chamber connects to the liquid outlet and the water outlet trough. The stationary valve sleeve has a valve cavity and a water outlet. The valve cavity has multiple radial water nozzles circumferentially arranged to connect the medium cavity, the water outlet, and the liquid outlet chamber respectively. The water outlet is connected to the water outlet trough. The moving valve core is located in the valve cavity. When the moving valve core rotates to the point where the medium cavity and the water outlet are connected, the medium cavity and the water outlet trough are connected, the liquid outlet of the power generation module and the water outlet trough are closed, and the water injection device is in water injection mode. When the moving valve core rotates to the point where the liquid outlet chamber and the water outlet are connected, the liquid outlet of the power generation module and the water outlet trough are connected, the medium cavity and the water outlet trough are closed, and the water injection device is in power generation mode. The valve chamber of the flow regulating section is provided with four radial water nozzles arranged in a cross shape. The moving valve core is T-shaped, and there are two water outlets. When the water injection device is in the water injection state, the moving valve core connects the two water outlets and the medium chamber. When the water injection device is in the power generation state, the moving valve core connects the two water outlets and the liquid outlet chamber.

2. The water injection device as described in claim 1, characterized in that, The control circuit, after controlling the flow regulating section to connect the liquid outlet of the power generation module and the water outlet tank, and after cutting off the medium chamber and the water outlet tank, is also used for: The MPPT algorithm is used to dynamically adjust the generator load so that the generator operates at its maximum power output point.

3. The water injection device as described in claim 1, characterized in that, The operating modes of the control circuit include a sleep mode and a working mode; When the control circuit is in sleep mode, it is used to detect the current battery level at a first set interval and determine whether the current battery level is lower than a set threshold. If so, enter the working mode, determine whether the current flow rate in the medium cavity meets the power generation requirements. If it does, control the flow regulation section to connect the liquid outlet of the power generation module and the water outlet tank, and cut off the medium cavity and the water outlet tank. When the control circuit is in working mode, it is also used to detect the current power of the battery at a second set interval to determine whether it is fully charged; if so, it controls the flow regulating section to connect the medium chamber and the water outlet tank, and cuts off the liquid outlet of the power generation module and the water outlet tank, thus entering sleep mode.

4. The water injection device as described in claim 3, characterized in that, The control circuit determines whether the current flow rate in the medium cavity meets the power generation requirements, and is used for: Determine whether the current flow rate in the medium cavity is greater than the minimum flow rate threshold and less than the maximum flow rate threshold.

5. The water injection device as described in claim 1, characterized in that, It also includes the electrical framework; The electrical skeleton is located inside the housing. The electrical skeleton and the upper connector form an isolated electrical cavity and a liquid injection channel. The electrical skeleton and the intermediate connector form a medium cavity. The water injection port is connected to the medium cavity through the liquid injection channel.

6. The water injection device as described in claim 1, characterized in that, When the moving valve core rotates to any position where the four radial water nozzles are not connected, the water injection device is in a completely blocked state.

7. The water injection device as described in claim 1, characterized in that, The flow regulating section also includes a motor, which is encapsulated in the first pipe and connected to the moving valve core via a universal joint, for driving the rotation of the moving valve core.

8. The water injection device as described in claim 7, characterized in that, The power generation module is provided with a second pipe, and the generator is encapsulated within the second pipe.

9. The water injection device as described in claim 5, characterized in that, The electrical frame is equipped with a conduit, and the wires of the flow regulating section and the power generation module are all passed through the conduit.

10. The water injection device as described in claim 5, characterized in that, It also includes a support rod, which is disposed inside the medium cavity, and the two ends of the support rod are respectively connected to the intermediate joint and the electrical frame.

11. A method for water injection with controllable self-generated power via magnetic levitation in wells, characterized in that, Using the control circuit of the downhole magnetic levitation controllable self-generating water injection device according to any one of claims 1 to 10, the self-generating power generation and water injection control are performed through the following steps: If the battery charge is detected to be below a set threshold, the flow regulating switch is controlled to connect the liquid outlet of the power generation module and the water outlet tank, while cutting off the medium chamber and the water outlet tank, so that the water injection device enters the power generation state; if the battery is detected to be fully charged, the flow regulating switch is controlled to connect the medium chamber and the water outlet tank, while cutting off the liquid outlet of the power generation module and the water outlet tank, so that the water injection device enters the water injection state.

12. The method as described in claim 11, characterized in that, Also includes: The moving valve core of the flow regulating section is rotated to a position where the four radial water nozzles are not connected, so that the water injection device enters the flow throttling state.

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