Method for stably adjusting rotating speed of hydroelectric generator and impeller of oil field water injection well pipeline

Abstract

According to the hydroelectric generator of the oil field water injection well pipeline and the impeller rotating speed stable adjusting method, on the basis of an existing hydroelectric generator structure, an adjustable nozzle structure is arranged to adjust the opening degree of a nozzle of a water inlet of the generator, and therefore the high-pressure water in the oil field water injection well pipeline with the unstable high-pressure water flow and the flow changing at any time can be stably adjusted. The power generation efficiency of the generator is always in the optimal state to charge the storage battery, and the structural strength and the anti-pressure capability of the generator are designed in order to meet the high-voltage working condition. High-pressure water flow in the water injection well is used for self-generating electricity, the electricity demand of equipment on a water injection well pipeline is met, the use cost and maintenance cost of a battery are saved, a manual cut-off valve on the pipeline can be changed into an electric control cut-off valve, opening and closing of the cut-off valve can be remotely controlled, manpower and material resources are saved, and digital management of water injection of the oil well is also facilitated. The hydroelectric generator is convenient and fast to install, civil engineering and other auxiliary facilities are not needed, and the hydroelectric generator can be directly installed on an existing pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of oil production, and more specifically to a hydraulic generator for an oilfield water injection well pipeline and a method for stabilizing the rotation speed of an impeller. Background Art

[0002] In the early stage of exploitation of an oil field, most of the oil reservoirs can rely on the original formation pressure of the oil layer to drive crude oil and natural gas to the surface through the oil well. However, after a certain period of production, the pressure inside the formation gradually decreases. When the oil well in the oil field produces oil, it is necessary to inject high-pressure water into the underground reservoir to squeeze the oil out of the oil layer so that the oil pump can extract the oil out of the well. Since the amount of water injected into the well is insufficient to lift the crude oil to the ground, the oil well will stop spraying oil. At this time, if some water injection wells are drilled at the edge of the oil field or the low part of the oil layer or the position between the oil wells, qualified water is injected into the same stratum as the oil well through a high-pressure water injection pump. On the one hand, water is used to occupy the original storage position of oil and gas, so that the crude oil is continuously squeezed to the bottom of the oil well by water and sprayed to the ground. On the other hand, it can make up for the underground pressure loss caused by the outflow of oil and gas. When the oil well in the oil field produces oil, it is necessary to inject high-pressure water into the underground oil reservoir to squeeze the oil out of the oil layer so that the oil extraction machine can extract the oil out of the well. Because the amount of water injected needs to be monitored and controlled, the water injection pipeline is equipped with shut-off valves, flow meters, pressure sensors, RTU controllers and other related equipment. Since sensors such as flow meters and pressure sensors, RTU controllers, etc. all require electricity to work, the existing implementation plan is powered by batteries. Since batteries are consumables, the more electricity is used, the less it is, and there is a hidden danger of loss in data collection and transmission. The battery life is short, and the equipment use and maintenance costs are high. Due to the limitation of electric energy, only manual shut-off valves can be used on the pipeline, and automatic or remote control cannot be achieved. Manpower is needed to complete the on and off of the pipeline water injection. In an oil production area, there are a large number of oil wells, which requires a lot of manpower to complete this work. The existing technology uses wind and solar equipment to generate electricity to provide electricity for water injection wells, but wind and solar power generation equipment is greatly affected by the environment. According to the applicant's customers, wind and solar equipment is also easy to be stolen on the ground.

[0003] The application number is 202010241660.4, and the patent name is an invention patent application for a well completion permanent layered automatic measurement and adjustment water injection oil production autonomous measurement system (referred to as the comparative patent). It uses the resources of underground water injection and uses turbines to generate electricity. The power generation mainly provides electricity for the normal operation of underground equipment. Part of the electricity generated by the turbine directly provides electricity to all equipment through a voltage-stabilized power supply, and part of it charges the underground backup power supply. It solves the technical problems of the existing technology that underground measurement has no power supply and can only rely on the ground to provide energy, and often fails to collect signals, so it can only be re-installed.

[0004] Due to the unstable flow rate, low flow rate, and low flow velocity of the injection well pipeline, the efficiency of the generator is not high, the power output is not much, and the flow rate changes with time, which will cause the generator to operate unstably, and the output power may not be able to continuously charge the battery. The comparative patent only mentions using the resources of downhole water injection to generate electricity with a water turbine underground, which is just a concept. Considering the actual working conditions of oilfield injection wells, the existing technology of applying a water turbine to an injection well for self-generation has no practicality. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a hydraulic generator for an oilfield injection well pipeline and a method for stably adjusting the impeller speed in view of the technical problem that placing a water turbine in an oilfield injection well for power generation in the prior art is not practical. A hydraulic generator for an oilfield injection well pipeline includes a generator housing, a stator, and a rotor. The generator housing includes a water inlet and a water outlet. The rotor is provided with an impeller. Water flows through the water inlet and drives the impeller to rotate, causing the rotor to cut the magnetic field lines to generate electricity. It also includes an adjustable nozzle structure, which includes a driving device, a transmission component, and a flow guide adjustment block. The driving device and the transmission component are installed on the generator housing, and the flow guide adjustment block is installed at the nozzle of the water inlet. The power of the driving device drives the flow guide adjustment block to rotate through the transmission component, thereby adjusting the opening degree of the nozzle of the water inlet.

[0006] The water turbine of the prior art includes a generator housing, a stator, and a rotor. The rotor is provided with an impeller to drive the rotor to cut the magnetic field lines in the stator to generate electricity, and the generated electric energy is charged to the battery through a power management system. Due to the unstable flow rate, low flow rate, and low flow velocity of the oilfield injection well pipeline, the efficiency of the generator is not high, the power output is not much, and the flow rate changes with time, which will cause the generator to operate unstably, and the output power may not be able to continuously charge the battery. The present invention improves on the structure of the existing water turbine to make it suitable for continuous power generation in the oilfield injection well pipeline. An adjustable nozzle structure is provided. When the high-pressure water flow rate increases, the flow guide adjustment block rotates to increase the nozzle opening degree and reduce the flow velocity; when the flow rate decreases, the flow guide adjustment block rotates to reduce the nozzle opening degree and increase the flow velocity. By adjusting the nozzle opening degree, the flow velocity of the water flowing in from the water inlet is adjusted, so that the force of the water impacting the impeller changes, thereby realizing the adjustment of the impeller speed; enabling the generator to always be in the best power output state and ensuring the charging effect on the battery.

[0007] It should be noted that: there is a kind of water turbine with guide vanes on the market. This kind of water turbine is generally a large-scale water turbine, and the guide vanes therein play the role of changing the water flow direction and regulating the water flow rate. The guide vanes are surrounded by a circle of blades, which reverse the linearly flowing water into a circular motion through the included angle of the guide vane arc surface, so that the force of the water flow driving the impeller reaches the maximum and is more concentrated. The adjustable nozzle structure of the present invention is different from the guide vane structure, and large-scale water turbines are not applicable to the oilfield injection well pipelines described in the present invention. The hydraulic generator of the present invention is a miniature hydraulic generator. The present invention utilizes the flow rate of the injection well pipeline, installs a hydraulic generator, preferably a permanent magnet generator, on the pipeline, and sets an adjustable nozzle structure, and uses the electric energy generated by the generator to continuously charge the battery to ensure that the battery power is always full. Due to the sufficient electric energy, the manual valve on the pipeline can be changed to an electric control valve, and the remote transmission and control functions of the RTU are utilized to realize the remote control of the electric control valve, saving a large amount of manpower and material resources, and at the same time being more convenient for the digital management of oil well water injection. The present invention generates electricity by itself using the high-pressure water flow in the injection well, which can save the battery usage cost and maintenance cost.

[0008] Further, the transmission component includes an adjustment shaft and a push block. The adjustment shaft is connected to the driving device, and the driving device drives the adjustment shaft to rotate; the adjustment shaft is in threaded cooperation with the push block to drive the push block to move linearly; the push block is rotatably connected to the flow guiding and adjusting block; the linear movement of the push block causes the flow guiding and adjusting block to rotate, thereby adjusting the opening degree of the water inlet nozzle. The adjustment shaft can only rotate under the drive of the driving device and cannot move axially. The end of the adjustment shaft is provided with external threads, and the inner hole of the push block is provided with internal threads. When the adjustment shaft rotates, through the threaded cooperation, the push block is driven to move linearly back and forth.

[0009] Further, the flow guiding and adjusting block has a cylindrical structure, and a cylindrical groove adapted to the cylindrical structure is opened on the generator housing, and the push block pushes the flow guiding and adjusting block to rotate around the central axis of the cylindrical structure.

[0010] Further, the flow guiding and adjusting block includes a connecting portion, the cylindrical structure and a movable flap connected in sequence. The connecting portion is rotatably connected to the push block, and the movable flap is attached to the water inlet nozzle; the power of the driving device drives the flow guiding and adjusting block to rotate through the transmission component to adjust the opening degree of the water inlet nozzle, which means that the power of the driving device drives the flow guiding and adjusting block to rotate through the transmission component, that is, the movable flap rotates, thereby adjusting the included angle between the movable flap and the water inlet nozzle, and thus adjusting the opening degree of the water inlet nozzle.

[0011] Further, the flow guiding and adjusting block is in a "7" - shaped structure, and the junction of the horizontal and vertical parts of the "7" - shaped structure is the cylindrical structure; the flow guiding and adjusting block rotates around the central axis of the cylindrical structure, increasing or decreasing the angle between the movable flap and the water inlet nozzle. When the movable flap fits with the water inlet nozzle and the flow guiding and adjusting block rotates, the movable flap rotates away from the nozzle to open.

[0012] Further, an installation groove is formed on the generator housing, and the adjusting shaft, the push block, and the flow guiding and adjusting block are all placed in the installation groove. The cylindrical groove is part of the installation groove; the installation groove is divided into two parts. One part houses the push block and the connecting part, and the width of this part of the groove is greater than the width of the push block and the connecting part, enabling the push block to move linearly in the installation groove and the connecting part to rotate in the installation groove; the other part of the installation groove, namely the cylindrical groove, houses the cylindrical structure; the plane where the flow guiding and adjusting block rotates is parallel to the bottom surface of the installation groove, enabling the flow guiding and adjusting block to rotate in the installation groove.

[0013] Further, the adjustable nozzle structure further includes an inner cover plate, which covers the installation groove. The inner cover plate plays a role in preventing overflow, preventing water flow from entering the impeller chamber without passing through the nozzle, so as to ensure the efficiency of the generator.

[0014] Furthermore, a guiding groove is provided at the corresponding position of the inner side of the inner cover plate and the push block to guide the movement of the push block, ensuring that the push block can only move axially along the adjusting shaft.

[0015] Further, the fact that the push block is rotationally connected to the flow guiding and adjusting block means that: an arc - shaped protrusion is provided on the connecting part of the push block, and a groove is provided on the flow guiding and adjusting block, and the protrusion and the groove are rotationally matched.

[0016] Further, the water inlet nozzle is an inclined cut facing the adjustable nozzle structure, the movable flap can fit with the inclined cut, and the movable flap rotates around the central axis of the cylindrical structure to adjust the angle between the movable flap and the inclined cut, thereby adjusting the opening degree of the water inlet nozzle.

[0017] Further, the enameled wire of the stator coil of the stator adopts double - layer enameled wire. In addition to using double - layer enameled wire, the coil is also integrally potted. The heat dissipation of the coil is through the natural heat dissipation of the water flow in the flow channel. The flowing water continuously takes away the heat energy generated by the coil, preventing the coil from heating up.

[0018] The hydraulic generator is installed on the part of the pipeline above the ground. Installing the hydraulic generator above the ground is more convenient for installation and maintenance. The installation of the hydraulic generator is convenient and fast, without the need for civil engineering and other auxiliary facilities, and can be directly installed on the existing ground pipeline.

[0019] The present invention also provides a method for stably adjusting the rotational speed of the impeller of a hydraulic generator for an oilfield injection well pipeline. A flowmeter and a controller are installed on the pipeline. When the flow rate in the pipeline is monitored by the flowmeter to change, the flow rate data passes through the preset program of the controller to control the driving device to rotate at a preset angle, and drives the guide flow adjustment block to rotate through a transmission component to adjust the opening degree of the water inlet nozzle. When the flow rate increases, the opening degree of the water inlet nozzle is adjusted to increase, reducing the water flow velocity. When the flow rate decreases, the opening degree of the water inlet nozzle is adjusted to decrease, increasing the water flow velocity. The rotational speed of the impeller is maintained within a set range, enabling the generator to always be in the optimal power output state and ensuring the charging effect on the battery.

[0020] Preferably, the controller is an RTU controller.

[0021] The English full name of RTU is Remote Terminal Unit, and the Chinese full name is Remote Terminal Control System. RTU is a remote measurement and control unit device responsible for monitoring and controlling on-site signals and industrial equipment.

[0022] High-pressure water is injected into the oilfield injection well. To conform to the actual working conditions, further, the overall structural strength of the generator is enhanced by increasing the thickness of the housing, thereby increasing the pressure-bearing capacity of the generator. And the generator is designed for pressure resistance. The enameled wire of the stator coil of the stator uses double-layer enameled wire. The outlet terminal is designed as a watertight joint to ensure stable connection performance of the outlet terminal in a high-pressure water environment and prevent coil short-circuit.

[0023] The present invention has the following beneficial effects: The present invention utilizes the flow rate of the pipeline of an oilfield water injection well. A pipeline hydraulic generator is installed on the pipeline, and the electric energy generated by the generator is continuously used to charge the battery to ensure that the battery power always remains full. The hydraulic generator of the oilfield water injection well pipeline is an adaptive hydraulic generator applicable to high-pressure, low-flow, low-velocity, and small-diameter pipelines, and is suitable for the actual working conditions of oilfield water injection wells. Different from the comparative patent described in the background technology: an adjustable nozzle structure is provided in the hydraulic generator to adjust the opening degree of the nozzle at the water inlet of the generator, which can ensure that the generator always maintains a stable output state under the condition that the flow rate of the water injection well pipeline is unstable and changes with time periods, ensure that the battery has sufficient power, and ensure the power supply of the system. And in order to meet the high-pressure working conditions, the structural strength and compressive capacity of the generator are designed. It solves the power consumption requirements of the equipment on the oilfield water injection well pipeline, can change the manual cut-off valve on the pipeline into an electric control cut-off valve, and can remotely control the opening and closing of the cut-off valve, saving a large amount of manpower and material resources, and at the same time being more convenient for the digital management of oil well water injection. The present invention uses the high-pressure water flow in the water injection well to generate electricity by itself, which can save the battery usage cost and maintenance cost. The hydraulic generator is convenient and fast to install, does not require civil engineering and other auxiliary facilities, and can be directly installed on the existing pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is the front view of the hydraulic generator of the oilfield water injection well pipeline of the present invention; Figure 2 is the sectional view of the front view of the hydraulic generator of the oilfield water injection well pipeline of the present invention; Figure 3 is the sectional view of the top view of the hydraulic generator of the oilfield water injection well pipeline of the present invention; Figure 4 is the partial view of the adjustable nozzle structure and the generator housing of Embodiment 2; Figure 5 is the structure diagram of the push block of Embodiment 2; Figure 6 is the structure diagram of the adjusting shaft, push block, and inner cover plate of Embodiment 2; Figure 7 is the top view of the hydraulic generator of the oilfield water injection well pipeline of the present invention (stator hidden) Serial numbers: 1 - Rear cover, 2 - Generator housing, 2a - Water inlet, 2b - Water outlet, 2c - Installation groove, 3 - Shaft, 4 - Impeller, 5 - Stator coil, 6 - Stator housing, 7 - Watertight joint, 8 - Upper cover, 9 - Outer cover, 10 - Joint, 11 - Driving device, 12 - Adjusting shaft, 13 - Bearing, 14 - Pusher block, 14a - Threaded hole, 14b - Arc-shaped protrusion, 15 - Flow guide and adjusting block, 15a - Connecting part, 15b - Cylindrical structure, 15c - Movable flap, 16 - Oblique cut, 17 - End cover, 18 - Inner cover plate, 18a - Guide groove, 19 - Driving device mounting plate, 20 - Sealing ring. Detailed implementation mode

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the claims.

[0026] Embodiment 1 A hydraulic generator for an oilfield injection well pipeline. The hydraulic generator is a permanent magnet generator, including a generator housing 2, a stator and a rotor, as Figure 1 , 2 shown. The generator housing 2 includes a water inlet 2a and a water outlet 2b. The rotor is provided with an impeller 4. Water flows into the impeller 4 through the water inlet 2a, driving the impeller 4 to rotate, so that the rotor cuts the magnetic lines of force to generate electricity. It also includes an adjustable nozzle structure. The adjustable nozzle structure includes a driving device 11, a transmission component and a flow guide and adjusting block 15. The driving device 11 and the transmission component are installed on the generator housing 2, and the flow guide and adjusting block 15 is installed at the nozzle of the water inlet. The power of the driving device 11 drives the flow guide and adjusting block 15 to rotate through the transmission component, thereby adjusting the opening degree of the nozzle of the water inlet.

[0027] A cut-off valve, a flow meter, a pressure sensor and a TRU controller are installed on the pipeline of the injection well in this embodiment. The cut-off valve is an electric control valve. The cut-off valve, the flow meter, the pressure sensor and the TRU controller are all powered by the hydraulic generator described in this embodiment.

[0028] When the flow rate on the pipeline increases, the flow meter installed on the pipeline monitors the change in the flow rate. The flow rate data passes through the RTU preset program, controls the micro electric actuator to rotate at a preset angle, and drives the flow guide and adjusting block 15 to rotate through the transmission component, thereby adjusting the opening degree of the nozzle of the water inlet. When the flow rate increases, the opening degree of the nozzle of the water inlet is adjusted to increase; when the flow rate decreases, the opening degree of the nozzle of the water inlet is adjusted to decrease, so that the generator is always in the best power output state, ensuring the continuous charging effect on the battery.

[0029] Since the self - generating device, a hydraulic generator, which can provide continuous power supply, is installed in the present invention, the power demand of the equipment on the pipeline of the oil well injection well is solved. The manual cut - off valve on the pipeline can be changed into an electric - control cut - off valve, and the opening and closing of the cut - off valve can be remotely controlled, saving a large amount of manpower and material resources. At the same time, it is more convenient for the digital management of oil well water injection. It greatly saves the battery usage cost and maintenance cost, and the hydraulic generator is convenient and fast to install, without civil engineering and other auxiliary facilities, and can be directly installed on the existing pipeline.

[0030] Embodiment 2 On the basis of Embodiment 1, in Embodiment 2, the specific structure of the adjustable nozzle structure is designed. As Figure 3 shown, the transmission component includes an adjusting shaft 12 and a push block 14.

[0031] Adjusting shaft 12: An installation hole for the adjusting shaft 12 is opened on the generator housing 2. As Figure 3 shown, the installation hole for the adjusting shaft 12 is a T - shaped hole. The adjusting shaft 12 passes through the T - shaped hole. A bearing 13 is installed in the smaller hole of the T - shaped hole, and an end cover 17 is installed in the larger hole of the T - shaped hole. A driving device mounting plate 19 is installed on the end cover 17. The driving device 11 (a micro electric actuator) is installed on the driving device mounting plate 19. The output end of the driving device 11 is fixed with the adjusting shaft 12, and the driving device 11 drives the adjusting shaft 12 to rotate.

[0032] Push block 14: The adjusting shaft 12 extends into the generator housing 2 and is connected to the push block 14. The push block 14 is provided with internal threads, and the end of the adjusting shaft 12 has external threads. The threaded connection between the push block 14 and the adjusting shaft 12 can drive the push block 14 to move linearly. The cooperation between the adjusting shaft 12 and the push block 14 is equivalent to the cooperation between a lead screw and a nut, converting the rotational motion of the driving device 11 into a linear motion. As Figure 5 shown, a threaded hole 14a is opened at the center of the push block 14 for connection with the adjusting shaft 12; one side of the push block 14 has an arc - shaped protrusion 14b for rotatably connecting with the diversion adjustment block 15. As Figure 5 shown, the height of the arc - shaped protrusion 14b is shorter than the body of the push block 14, and the part that the body of the push block 14 grows out is used to cooperate with the guide groove 18a on the inner cover plate 18.

[0033] Diversion adjustment block 15: The diversion adjustment block 15 includes a connecting part 15a, the cylindrical structure 15b and a movable flap 15c connected in sequence. In this embodiment, the diversion adjustment block 15 is similar to a "7" - shaped. The intersection of the horizontal and vertical of the "7" - shaped structure is the cylindrical structure 15b; the diversion adjustment block 15 rotates around the central axis of the cylindrical structure 15b, so that the included angle between the movable flap 15c and the inclined cut 16 increases or decreases. As Figure 4As shown, one end of the flow guiding and adjusting block 15 is a connecting part 15a which has a groove and is rotationally matched with the arc-shaped protrusion 14b on the push block 14; the cylindrical structure 15b of the flow guiding and adjusting block 15 is arc-transitionally connected with the movable flap 15c, and the movable flap 15c is in contact with the water inlet nozzle. The cylindrical structure 15b on the flow guiding and adjusting block 15 in this application has a very important function. A cylindrical groove adapted to the cylindrical structure 15b is provided at the position of the generator housing 2 corresponding to the cylindrical structure 15b. When the push block 14 drives the flow guiding and adjusting block 15 to rotate, the flow guiding and adjusting block 15 rotates with the central axis of the cylindrical structure 15b as the rotation axis.

[0034] Movable flap 15c: As Figure 3 and Figure 4 shown, the water inlet 2a nozzle is an inclined cut 16 facing the direction of the adjustable nozzle structure, and the movable flap 15c can be in contact with the inclined cut 16; the movable flap 15c rotates with the central axis of the cylindrical structure 15b as the rotation axis to increase or decrease the angle between the movable flap 15c and the inclined cut 16, thereby adjusting the opening degree of the water inlet 2a nozzle. As shown in the figure, when the "7"-shaped flow guiding and adjusting block 15 rotates with the central axis of the cylindrical structure 15b as the rotation axis, the movable flap 15c rotates towards the mounting groove 2c direction, adjusting the increase or decrease of the angle between the movable flap 15c and the inclined cut 16, that is, increasing or decreasing the opening degree of the nozzle.

[0035] Mounting groove 2c: A mounting groove 2c is also provided on the generator housing 2. The adjusting shaft 12, the push block 14 and the flow guiding and adjusting block 15 are all placed in the mounting groove 2c, and the cylindrical groove is a part of the mounting groove 2c. As Figure 4 shown, the mounting groove 2c is divided into two parts. One part houses the push block 14 and the connecting part 15a, and the width of this part of the groove is wider than that of the push block 14 and the flow guiding and adjusting block 15, so that the push block 14 and the flow guiding and adjusting block 15 can move in the groove; the other part, namely the cylindrical groove, is a cylindrical hole that houses the cylindrical structure 15b. There are two notches on the cylindrical groove, one for the transition part of the connecting part 15a and the cylindrical structure 15b to pass through, and one for the movable flap 15c to pass through so that the movable flap 15c is placed at the water inlet 2a nozzle. The plane on which the flow guiding and adjusting block 15 rotates is parallel to the bottom surface of the mounting groove 2c, so that the flow guiding and adjusting block 15 rotates in the mounting groove 2c.

[0036] Inner cover plate 18: An inner cover plate 18 is also covered on the mounting groove 2c. As Figure 7 shown, the inner cover plate 18 covers the mounting groove 2c. The inner cover plate 18 plays a role in preventing overflow, preventing water flow from entering the impeller 4 chamber without passing through the nozzle, so as to ensure the efficiency of the generator. As Figure 6As shown, a guide groove 18a is provided at the corresponding position of the push block 14 on the inner side of the inner cover plate 18 to guide the movement of the push block 14. The provision of the guide groove 18a also ensures that the push block 14 can stably move axially along the adjusting shaft 12.

[0037] As Figure 4 As shown, the driving device 11 drives the adjusting shaft 12 to rotate. The adjusting shaft 12 is threadedly connected to the push block 14. The push block 14 is located in the installation groove 2c, and the guide groove 18a in the inner cover plate 18 guides the linear movement of the push block 14. The rotational movement of the adjusting shaft 12 is converted into the linear movement of the push block 14, and the push block 14 moves axially along the adjusting shaft 12. One side of the push block 14 is rotatably connected to the flow guiding and adjusting block 15. Due to the limiting effect of the cylindrical groove on the cylindrical structure 15b, the linear movement of the push block 14 causes the flow guiding and adjusting block 15 to rotate about the central axis of the cylindrical structure 15b. The rotation of the flow guiding and adjusting block 15 drives the movable flap 15c to rotate, adjusting the angle between the movable flap 15c and the inclined cut 16. The structure of the flow guiding and adjusting block 15 is similar to a "7" shape. The junction of the horizontal and vertical parts of the "7" shape is the cylindrical structure 15b. The movable flap 15c can fit with the inclined cut 16. When the "7" - shaped structure rotates, the movable flap 15c rotates about the cylindrical structure 15b, and the movable flap 15c rotates in a direction away from or close to the inclined cut 16, increasing or decreasing the opening of the nozzle. The flowmeter installed on the pipeline monitors the change of the flow rate. The flow rate data passes through the preset program of the RTU, controlling the micro - electric actuator to rotate at a preset angle, realizing the automatic real - time control of the nozzle opening.

[0038] For the hydraulic generator described in this embodiment, the generator is designed for compressive resistance. The enameled wire of the stator coil 5 of the stator uses double - layer insulated enameled wire. The outgoing line head is designed as a watertight joint 7 to ensure that the outgoing line head can still maintain insulation in a high - pressure environment and prevent coil short - circuit. The impeller 4 uses a double - impact impeller. The impeller 4 is fixed integrally with the magnetic steel. When the impeller 4 rotates, it drives the magnetic steel to rotate synchronously. The generator can withstand a pressure of 25 MPa, and the ultimate pressure - bearing capacity is 37.5 MPa. The enameled wire is potted with potting glue, and the outgoing line head uses a watertight joint 7, which can withstand a pressure of 70 MPa without leakage.

[0039] Embodiment 3 A method for stably adjusting the rotational speed of the impeller of a hydraulic generator for an oilfield water injection well pipe is provided. An adjustable nozzle structure described in Embodiment 2 is provided in the hydraulic generator. A flowmeter and an RTU controller are installed on the pipe. The change in the flow rate in the pipe is monitored by the flowmeter. The flow rate data passes through the preset program of the RTU controller to control the driving device 11 to rotate at a preset angle, and drives the guide adjustment block 15 to rotate through the transmission component to adjust the angle between the movable flap 15c and the inclined notch 16. When the flow rate increases, the angle between the movable flap 15c and the inclined notch 16 increases, increasing the opening degree of the nozzle and reducing the flow velocity. When the flow rate decreases, the angle between the movable flap 15c and the inclined notch 16 decreases, reducing the opening degree of the nozzle and increasing the flow velocity, so that the rotational speed of the impeller 4 is stably within the set range, enabling the generator to always be in the optimal power output state and ensuring the charging effect on the battery. By adjusting the opening degree of the nozzle, the flow velocity of the water flowing from the water inlet is adjusted, causing the force of the water impacting the impeller to change, thereby realizing the adjustment of the rotational speed of the impeller; enabling the generator to always be in the optimal power output state and ensuring the charging effect on the battery.

[0040] The overall structural strength of the generator is enhanced by increasing the thickness of the housing, thereby increasing the pressure-bearing capacity of the generator.

[0041] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the present invention.

Claims

1. A hydraulic generator for an oilfield water injection well pipeline, comprising a generator housing, a stator and a rotor. The generator housing includes a water inlet and a water outlet. An impeller is provided on the rotor. Water flows into through the water inlet to drive the impeller to rotate, causing the rotor to cut magnetic lines of force to generate electricity. It is characterized in that It further includes an adjustable nozzle structure, which includes a driving device, a transmission component, and a diversion adjustment block. The driving device and the transmission component are installed on the generator housing, and the diversion adjustment block is installed at the water inlet nozzle; the power of the driving device drives the diversion adjustment block to rotate through the transmission component, thereby adjusting the opening degree of the water inlet nozzle.

2. The hydraulic generator for the pipeline of the oilfield water injection well according to claim 1, wherein, The transmission component includes an adjustment shaft and a push block. The adjustment shaft is connected to the driving device, and the driving device drives the adjustment shaft to rotate; the adjustment shaft is in threaded cooperation with the push block to drive the push block to move linearly; the push block is rotationally connected to the diversion adjustment block; the linear movement of the push block causes the diversion adjustment block to rotate, thereby adjusting the opening degree of the water inlet nozzle.

3. The hydraulic generator for the pipeline of the oilfield injection well according to claim 2, characterized in that, The diversion adjustment block has a cylindrical structure, and a cylindrical groove adapted to the cylindrical structure is formed on the generator housing. The push block pushes the diversion adjustment block to rotate around the central axis of the cylindrical structure.

4. The hydraulic generator for the pipeline of the oilfield water injection well according to claim 3, characterized in that, The diversion adjustment block includes a connecting portion, the cylindrical structure, and a movable flap that are connected in sequence. The connecting portion is rotationally connected to the push block, and the movable flap is in contact with the water inlet nozzle; the power of the driving device drives the diversion adjustment block to rotate through the transmission component, thereby adjusting the opening degree of the water inlet nozzle, which means that the power of the driving device drives the diversion adjustment block to rotate through the transmission component, that is, the movable flap rotates, thereby adjusting the angle between the movable flap and the water inlet nozzle, and thus adjusting the opening degree of the water inlet nozzle.

5. The hydraulic generator for the pipeline of the oilfield water injection well according to claim 4, characterized in that, The diversion adjustment block is in a "7" - shaped structure, and the intersection of the horizontal and vertical parts of the "7" - shaped structure is the cylindrical structure; the diversion adjustment block rotates around the central axis of the cylindrical structure, increasing or decreasing the angle between the movable flap and the water inlet nozzle.

6. The hydraulic generator for the pipeline of the oilfield water injection well according to claim 3, characterized in that, An installation groove is formed on the generator housing. The adjustment shaft, the push block, and the diversion adjustment block are all placed in the installation groove, and the cylindrical groove is a part of the installation groove; the installation groove is divided into two parts. One part houses the push block and the connecting portion. The width of this part of the groove is greater than the width of the push block and the connecting portion, enabling the push block to move linearly in the installation groove and the connecting portion to rotate in the installation groove; the other part of the installation groove, that is, the cylindrical groove, houses the cylindrical structure; the plane where the diversion adjustment block rotates is parallel to the bottom surface of the installation groove, enabling the diversion adjustment block to rotate in the installation groove.

7. The hydraulic generator for the pipeline of an oilfield water injection well according to claim 6, characterized in that, The adjustable nozzle structure further includes an inner cover plate, which covers the installation groove.

8. The hydraulic generator for the oilfield water injection well pipeline according to claim 7, characterized in that, A guiding groove is provided at the corresponding position of the push block on the inner side of the inner cover plate to guide the movement of the push block.

9. The hydraulic generator for the pipeline of the oilfield water injection well according to claim 2, characterized in that, The push block is rotationally connected to the diversion adjustment block, which means that an arc - shaped protrusion is provided on the connecting portion of the push block, and a groove is provided on the diversion adjustment block, and the protrusion and the groove are in rotational cooperation.

10. A method for stably adjusting the impeller speed of a hydraulic generator for an oilfield injection well pipeline according to any one of claims 1-9, characterized in that, A flow meter and a controller are installed on the pipeline. When the flow rate in the pipeline changes as monitored by the flow meter, the flow rate data passes through the preset program of the controller to control the driving device to rotate at a preset angle, and drives the diversion adjustment block to rotate through the transmission component to adjust the opening degree of the water inlet nozzle; when the flow rate increases, the opening degree of the water inlet nozzle is increased to reduce the water flow velocity; When the flow rate decreases, adjust the opening degree of the inlet nozzle to decrease and increase the water flow velocity; keep the rotational speed of the impeller within the set range.

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