Pumping unit reverse electric energy recovery device and using method thereof

Abstract

The invention discloses a pumping unit reverse electric energy recovery device which comprises a pumping unit speed reducer, a power assembly, a power transmission assembly, a hydraulic pump motor assembly and a power recovery mechanism, and an output shaft of the power assembly is connected with an extending shaft of the pumping unit speed reducer through the power transmission assembly. The hydraulic pump motor assembly is provided with a first power shaft and a second power shaft, the first power shaft is connected with an output shaft of the power assembly, and the second power shaft is connected with the power recovery mechanism. The flywheel is used for collecting energy, and the operation energy consumption of the pumping unit is reduced; reverse electric energy recovery and utilization of one or more pumping units can be achieved at the same time, the pumping unit is matched with a beam pumping unit and a belt pumping unit, and the application range is wide.

Description

Technical Field

[0001] The invention relates to the technical field of energy saving for oil pumping units, in particular to a reverse power generation energy recovery device for an oil pumping unit and a use method thereof. Background Art

[0002] At present, the working principle of various pumping units (beam type, chain type, belt type, etc.) is to lift the bottom hole pump piston reciprocatingly to draw the bottom hole liquid, do work during the upstroke, and do no work during the downstroke. The power source of the pumping unit is mainly the motor. As the falling speed of the sucker rod increases, in the middle and late stages of the rod falling, the rod drags the donkey head back to make the AC motor in a power generation state to feed power to the grid, so that part of the energy of the rod falling is absorbed by the AC motor. When the rod rises, the motor needs to work again to compensate for the energy absorbed when the rod falls, thereby increasing the dynamic load and conversion loss of the AC motor.

[0003] For a long time, technicians have been exploring the working mode that the motor is powered on during the upstroke and powered off during the downstroke. Therefore, in order to realize the energy recovery from the pumping unit to the power generation unit and ensure the operational stability of the pumping unit, a reverse power recovery device for the pumping unit and its use method are designed. The power recovery device is added to the existing pumping unit to simplify the transformation workload, and at the same time, the downward potential energy is stored and fully utilized, achieving the effect of saving electricity and energy.

[0004] Publication (announcement) number: CN115126447A, discloses an energy-saving oil pumping unit with power generation function, including a base plate, a bracket, a connecting piece 1, a walking beam, a connecting piece 2, a nut cylinder, a screw, an adjusting motor, a connecting piece 3, a counterweight, a bare rod, a power mechanism, a rack, a fixing frame, a lubrication mechanism, a connecting piece 4, a connecting rod 1, a connecting rod 2, a fixing rod, a connecting rod 3, a connecting rod 4, a power generation device and a donkey head, wherein the left side of the upper end of the base plate is fixedly connected with the bracket, the walking beam is rotatably connected with the inside of the bracket through the connecting piece 1, the top of the bracket is rotatably connected with the nut cylinder through the connecting piece 2, the end of the nut cylinder away from the connecting piece 2 is connected with the screw through a thread, the end of the screw rod away from the nut cylinder is fixedly connected to the power output shaft of the adjusting motor, and the end of the adjusting motor away from the screw is fixedly connected to the connecting piece 3.

[0005] The actual use effect of the prior art is not as good as that of the present invention.

[0006] Publication (Announcement) No.: CN219392511U discloses a beam pumping unit controller, which belongs to the technical field of oilfield beam pumping unit control systems. It includes a frequency converter, a hydraulic DC / DC converter, a super capacitor and a PLC programmable controller. One end of the hydraulic DC / DC converter is connected to the DC bus terminal of the frequency converter, and the other end of the hydraulic DC / DC converter is connected to the super capacitor. The PLC programmable controller is connected to the frequency converter via the RS485 bus. Through the cooperation between the hydraulic DC / DC converter and the super capacitor, energy recovery and reuse are achieved; at the same time, through the cooperation between the PLC programmable controller and the frequency converter, the function of the frequency converter automatically adjusting according to the on-site working conditions is achieved, reducing manual intervention and saving labor costs.

[0007] The actual use effect of the prior art is not as good as that of the present invention.

[0008] Publication (Announcement) No.: CN113187439A, discloses a potential energy development and application method of an oil production hoist, including a base and an oil production, the top of the base is respectively fixedly connected with a walking beam, a beam driving point, a connecting rod, a crank, a drive motor, a main frame bracket, an intelligent controller and a potential energy power generation system platform, the top of the main frame bracket is fixedly connected with a walking beam bearing seat, the surface of the walking beam bearing seat is provided with a walking beam, the surface of the walking beam is provided with a beam driving point, the beam driving point and the drive motor are connected by a crank movable sleeve and an application method. The potential energy development and application method of the oil production hoist solves the unbalanced disadvantage in the operation of the oil pump, lengthens the stroke of the oil pump, converts the vertical running potential energy of the pumping rod into rotational mechanical energy, drives the DC generator to generate electricity, and recovers and feeds back for application, thereby greatly reducing the production and operation cost of the oil production hoist.

[0009] The actual use effect of the prior art is not as good as that of the present invention.

[0010] In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the beneficial effects produced are all different from the present invention. Regarding more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the invention

[0011] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a reverse power recovery device for an oil pump and a method of using the same, which can recover and utilize the power of the oil pump.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A pumping unit reverse power recovery device, comprising a pumping unit reducer, a power assembly, and a power transmission assembly, wherein the output shaft of the power assembly is connected to the extension shaft of the pumping unit reducer through the power transmission assembly, and further comprising a hydraulic pump motor assembly and a power recovery mechanism;

[0014] The hydraulic pump motor assembly is provided with a first power shaft and a second power shaft, the first power shaft is connected to the power assembly output shaft, and the second power shaft is connected to the power recovery mechanism.

[0015] The hydraulic pump motor assembly comprises a first hydraulic pump motor and a second hydraulic pump motor, wherein the first hydraulic pump motor is connected to the oil tank via a first oil pipe, and the second hydraulic pump motor is connected to the oil tank via a second oil pipe;

[0016] The first hydraulic pump motor and the second hydraulic pump motor are connected via a third oil pipe and can drive each other.

[0017] The first hydraulic pump-motor and the second hydraulic pump-motor both have two working states, namely a pump mode and a motor mode.

[0018] The power component is a motor, and the power recovery mechanism is a flywheel.

[0019] The first power shaft of the first hydraulic pump motor is connected to the motor output shaft, and the second power shaft of the second hydraulic pump motor is connected to the flywheel.

[0020] The power transmission component is a transmission belt.

[0021] It also includes a data acquisition module and a control unit;

[0022] The data acquisition module collects the motion state parameters of the pumping unit and captures its motion state conversion data;

[0023] The control unit receives data from the data acquisition module and can control the first hydraulic pump motor and the second hydraulic pump motor to switch working states.

[0024] The data acquisition module is an encoder or a direction sensor.

[0025] A method for using a reverse power recovery device for an oil pump, during the operation of the pumping rod,

[0026] When the sucker rod of the pumping unit reaches the top dead center, the data acquisition module collects information and transmits it to the control unit. The control unit switches the first hydraulic pump motor to the pump mode and the second hydraulic pump motor to the motor mode. The gravity potential energy during the sucker rod's descent drives the first hydraulic motor to rotate through the transmission belt, and drives the second hydraulic pump motor to rotate through the hydraulic energy output to drive the flywheel to rotate, completing the recovery of reverse electric energy, ensuring the stability of the motor power and the unchanged output speed of the motor.

[0027] When the sucker rod runs to the bottom dead center, the data acquisition module collects the pumping unit operation status switching information and transmits it to the control unit. The control unit adjusts the second hydraulic pump motor to switch to pump mode and the first hydraulic pump motor to switch to motor mode. At this time, the flywheel drives the second hydraulic pump motor to rotate, and drives the first hydraulic pump motor to rotate through the hydraulic oil. The output torque is superimposed on the motor torque, and together drive the sucker rod upward to complete the release of the stored reverse electric energy. During this process, the motor operating power and speed remain unchanged.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Use the flywheel to collect and release energy, maintain the stability of the motor power, improve the operating reliability of the motor, and reduce the energy consumption of the pumping unit;

[0030] 2. A set of hydraulic pump motor is used to realize the soft connection of "machine-liquid-machine" between flywheel and motor, and play a role in motor protection;

[0031] 3. The device can realize the reverse power recovery and utilization of single or multiple pumping units at the same time. The pumping units are suitable for beam pumping units and belt pumping units, and have a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a reverse power recovery device for an oil pumping unit according to the present invention;

[0033] Figure 2 This is a control principle diagram of a reverse power recovery device for an oil pumping unit according to the present invention;

[0034] In the figure: 1. Motor; 2. Transmission belt; 3. Pumping unit reducer; 4. First hydraulic pump motor; 5. Second hydraulic pump motor; 6. Flywheel. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1 to Figure 2 The present invention provides a pumping unit reverse power recovery device and a method of using the same, including a power assembly, a power transmission assembly, a hydraulic pump motor assembly, a power recovery mechanism, a data acquisition module, a control unit, and a pumping unit reducer;

[0037] The output shaft of the power component is connected to the protruding shaft of the oil pump reducer 3 through the power transmission component. The hydraulic pump motor assembly is provided with a first power shaft and a second power shaft. The first power shaft is connected to the output shaft of the power component, and the second power shaft is connected to the power recovery mechanism. The data acquisition module collects the motion state parameters of the oil pump and captures its motion state conversion data. The control unit receives the data from the data acquisition module and controls the working state of the motor.

[0038] The power transmission component is a transmission belt, which transmits the motor power to the oil pump reduction box.

[0039] The hydraulic pump motor assembly includes a first hydraulic pump motor 4 and a second hydraulic pump motor 5, wherein the first hydraulic pump motor 4 is connected to the oil tank via a first oil pipe, and the second hydraulic pump motor 5 is connected to the oil tank via a second oil pipe;

[0040] The first hydraulic pump-motor 4 and the second hydraulic pump-motor 5 are connected via a third oil pipe and can drive each other. Both the first hydraulic pump-motor 4 and the second hydraulic pump-motor 5 have two modes: a pump mode and a motor mode.

[0041] The power component is a motor 1 , and the power recovery mechanism is a flywheel 6 .

[0042] The data acquisition module is an encoder that can measure the torque of the motor output shaft, and can also be a direction sensor that detects the running direction of the sucker rod.

[0043] The control unit is a PLC programmable logic controller, which can process the data collected by the data acquisition module.

[0044] The first power shaft of the first hydraulic pump motor 4 is connected to the motor output shaft, and the second power shaft of the second hydraulic pump motor 5 is connected to the flywheel 6;

[0045] In order to achieve energy saving effect, the signal collected by the data acquisition module is used to control the switching mode of the hydraulic pump motor. The control principle diagram is as follows: Figure 2 shown.

[0046] When the device is in use,

[0047] The data acquisition module collects the upward and downward operating state switching parameters of the oil pump in real time and outputs them to the control unit. After calculation, the control unit controls the first hydraulic pump motor 4 and the second hydraulic pump motor 5 to switch the pump mode or the motor mode.

[0048] When the pumping unit runs to the top dead center, the data acquisition module collects information, and after receiving the signal, the control unit controls the first hydraulic pump motor 4 to switch to the pump mode, and the second hydraulic pump motor 5 to switch to the motor mode. The motor 1 drives the gravity potential energy in the process of the sucker rod descending to drive the first hydraulic motor 4 in the pump mode to rotate through the transmission belt 2, generating liquid energy output to drive the second hydraulic pump motor 5 to rotate, thereby driving the flywheel 6 to rotate and complete energy storage. At this time, the power of the motor 1 is stable and the speed remains unchanged.

[0049] When the sucker rod reaches the bottom dead center, the data acquisition module collects information and controls the second hydraulic pump motor 5 to switch to pump mode and the first hydraulic pump motor 4 to switch to motor mode through the control unit. The second hydraulic pump motor 5 rotates under the drive of the energy storage flywheel 6, generating fluid energy to drive the first hydraulic pump motor 4 in motor mode to rotate, generating torque and the output torque of the motor 1 to jointly drive the sucker rod to lift, and at this time the motor power and speed can remain unchanged.

[0050] It should be noted that the encoder and direction sensor are existing technologies and can be purchased from the market, which is clear to those skilled in the art.

[0051] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0052] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0053] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0054] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pumping unit reverse power recovery device, comprising a pumping unit reducer, a power assembly, and a power transmission assembly, wherein the output shaft of the power assembly is connected to the extended shaft of the pumping unit reducer through the power transmission assembly, characterized in that: It also includes a hydraulic pump motor assembly and a power recovery mechanism; The hydraulic pump motor assembly is provided with a first power shaft and a second power shaft, the first power shaft is connected to the power assembly output shaft, and the second power shaft is connected to the power recovery mechanism.

2. The oil pumping unit reverse power recovery device according to claim 1, characterized in that: The hydraulic pump motor assembly comprises a first hydraulic pump motor and a second hydraulic pump motor, wherein the first hydraulic pump motor is connected to the oil tank via a first oil pipe, and the second hydraulic pump motor is connected to the oil tank via a second oil pipe; The first hydraulic pump motor and the second hydraulic pump motor are connected via a third oil pipe and can drive each other.

3. The oil pumping unit reverse power recovery device according to claim 2, characterized in that: The first hydraulic pump-motor and the second hydraulic pump-motor both have two working states, namely a pump mode and a motor mode.

4. The oil pumping unit reverse power recovery device according to claim 3, characterized in that: The power component is a motor, and the power recovery mechanism is a flywheel.

5. The oil pumping unit reverse power recovery device according to claim 4, characterized in that: The first power shaft of the first hydraulic pump motor is connected to the motor output shaft, and the second power shaft of the second hydraulic pump motor is connected to the flywheel.

6. The oil pumping unit reverse power recovery device according to claim 5, characterized in that: The power transmission component is a transmission belt.

7. The oil pumping unit reverse power recovery device according to claim 6, characterized in that: It also includes a data acquisition module and a control unit; The data acquisition module collects the motion state parameters of the pumping unit and captures its motion state conversion data; The control unit receives data from the data acquisition module and can control the first hydraulic pump motor and the second hydraulic pump motor to switch working states.

8. The oil pumping unit reverse power recovery device according to claim 7, characterized in that: The data acquisition module is an encoder or a direction sensor.

9. The oil pumping unit reverse power recovery device according to claim 7, characterized in that: The control unit is a PLC programmable logic controller.

10. A method for using a pumping unit reverse power recovery device, characterized in that: During the operation of the sucker rod, when the sucker rod of the oil pump reaches the top dead center, the data acquisition module collects information and transmits it to the control unit. The control unit switches the first hydraulic pump motor to the pump mode and the second hydraulic pump motor to the motor mode. The gravity potential energy during the descent of the sucker rod drives the first hydraulic motor to rotate through the transmission belt, and drives the second hydraulic pump motor to rotate through the liquid energy output to drive the flywheel to rotate, completing the recovery of reverse electric energy, ensuring the stability of the motor power and the unchanged output speed of the motor; When the sucker rod runs to the bottom dead center, the data acquisition module collects the pumping unit operation status switching information and transmits it to the control unit. The control unit adjusts the second hydraulic pump motor to switch to pump mode and the first hydraulic pump motor to switch to motor mode. At this time, the flywheel drives the second hydraulic pump motor to rotate, and drives the first hydraulic pump motor to rotate through the hydraulic oil. The output torque is superimposed on the motor torque, and together drive the sucker rod upward to complete the release of the stored reverse electric energy. During this process, the motor operating power and speed remain unchanged.

Images