Inertia mechanical energy storage device for beam-pumping unit

Abstract

The invention relates to the technical field of oil field oil production engineering, in particular to an inertia mechanical energy storage device of a beam-pumping unit. The device comprises an energy storage monitoring unit, an energy storage control unit, an energy storage protection unit, an energy storage metering display unit and an energy storage unit, the device is connected with a pumping unit motor driver in parallel, the state of a pumping unit motor is judged through the energy storage detection unit, and when the pumping unit motor generates reverse power generation due to inertia mechanical energy, the energy storage unit is connected with the pumping unit motor. The electric energy is stored in the energy storage unit through the energy storage control unit, adverse factors such as copper consumption increase, motor heating, influence on the service life of the motor, damage to a frequency converter and pollution to a power grid of the part of electric energy are prevented, and when it is detected that the power grid is in a sag state, the stored electric energy is released immediately, and the short-time electric energy demand is provided for a load. And meanwhile, the purposes of saving energy and reducing consumption of the beam-pumping unit are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil production engineering, and particularly relates to an inertia mechanical energy storage device of a beam-pumping unit. BACKGROUND

[0002] The beam-pumping unit is one of main equipments in the field of artificial lifting of oil exploitation, and its technical principle is mainly that a motor is connected to a gearbox, the gearbox drives a crank and a balance block to convert the rotating operation of the motor into up-down reciprocating motion, so as to realize artificial lifting of crude oil. In the up-stroke and down-stroke motion process of the motor of the beam-pumping unit, the balance block is caused to have a self-rotation speed greater than the set rotation speed of the motor due to the self-weight and rotation inertia of the balance block caused by unbalance, so that the motor generates "reverse power generation", copper consumption is increased, the motor is heated, the service life of the motor is affected, the power grid is polluted, and the part of electric energy is also wasted. In view of the above problems, the present application provides an inertia mechanical energy storage device of a beam-pumping unit. SUMMARY

[0003] (I) Technical problem to be solved

[0004] In view of the problems of motor heating and power grid pollution caused by the "reverse power generation" of the motor of the current beam-pumping unit, the present application provides an inertia mechanical energy storage device of a beam-pumping unit, which can store the electric energy generated by the "reverse power generation" of the motor of the beam-pumping unit in an energy storage unit of the inertia mechanical energy storage device, and immediately release the stored electric energy when the power grid appears in a "temporary drop" state, so as to provide short-time electric energy demand for the load and prevent shutdown. The inertia mechanical energy storage device of the beam-pumping unit provided by the present application not only solves the problems of motor heating and power grid pollution caused by the part of electric energy, but also provides part of useful power for the beam-pumping unit and saves energy consumption of the beam-pumping unit.

[0005] (II) Technical scheme

[0006] In order to solve the above problems, the present application provides an inertia mechanical energy storage device of a beam-pumping unit, which comprises:

[0007] An energy storage monitoring unit, which can realize real-time detection of three-phase voltage of the power grid, measurement of DClink, detection of environment and storage temperature, and detection of storage voltage, so as to provide data instructions for the working state of an energy storage control unit. When the controller of the beam-pumping unit is powered on, the monitoring unit detects whether the voltage of the power grid, the voltage of the Dlink, the environment and the storage temperature, and communication are normal. During normal operation of the device, the Dlink voltage and the voltage of the energy storage unit are compared and analyzed to determine whether to charge or discharge, and real-time communication is performed with the energy storage control unit, the metering unit and the protection unit of the device, and instructions are sent to determine the working state thereof.

[0008] Energy storage control unit, the control unit can realize the instruction of energy storage monitoring unit to realize the absorption current control, including the power charging and discharging current, the functional charging and discharging current. The access or disconnection of the driver, the voltage balance protection control and the module voltage detection function are controlled.

[0009] Energy storage protection unit, the protection unit can realize the protection function of leakage, discharge, overvoltage, undervoltage, overcurrent and network voltage anomaly, effectively protect the driver, prevent downtime caused by abnormal conditions such as "temporary drop".

[0010] Energy storage measurement display unit, the measurement display unit can realize the measurement, display and storage of absorption and release of electric quantity, including single charging and discharging capacity and total charging and discharging capacity.

[0011] Energy storage unit, the storage unit mainly provides energy storage medium, which can be but not limited to super capacitor, fast charging and discharging battery and other media that can realize fast charging and discharging.

[0012] (Three) beneficial effects

[0013] The beam pumping unit inertia mechanical energy storage device provided by the application judges the state of the pumping unit motor through real-time monitoring of the grid voltage and Dlink voltage, stores electric energy when the pumping unit motor appears "reverse power generation" phenomenon due to inertia mechanical energy, prevents the increase of copper consumption caused by the part of electric energy, causes the motor to heat, affects the service life of the motor, damages the frequency converter and pollutes the power grid and other adverse factors, and releases the stored electric energy when detecting that the power grid appears "temporary drop" state, provides short-time electric energy demand for the load, prevents downtime, and realizes the purpose of energy saving and consumption reduction of the pumping unit. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the beam pumping unit inertia mechanical energy storage device of the application;

[0015] Figure 2 It is a field application schematic diagram of the beam pumping unit inertia mechanical energy storage device of the application.

[0016] Among them, 1, energy storage monitoring unit; 2, energy storage unit; 3, energy storage control unit; 4, energy storage meter display unit; 5, energy storage protection unit; 6, energy storage device; 7, driver; 8, pumping unit control cabinet; 9, network electricity; 10, motor; 11, beam pumping unit. DETAILED DESCRIPTION

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the accompanying drawings of this invention, bidirectional arrows indicate bidirectional communication between the units within the device, while unidirectional arrows indicate unidirectional communication only. It is important to understand that the orientations or positional relationships indicated by terms such as "up," "down," "inner," "outer," "top," and "bottom" are based on the orientations or positional relationships shown in the drawings and are intended only to facilitate the description of this invention and to simplify the description. They do not indicate or imply that the components referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limitations on this invention.

[0019] Example:

[0020] like Figure 1 As shown, this embodiment provides an inertial mechanical energy storage device for a beam pumping unit, specifically comprising an energy storage monitoring unit (1), an energy storage control unit (3), an energy storage protection unit (5), an energy storage metering and display unit (4), and an energy storage unit (2). The energy storage device (6) is connected in parallel with the driver (7) in the pumping unit control cabinet, enabling short-term charging and discharging of the driver (7) to eliminate the adverse effects of "reverse power generation" current. When a "slowdown" state is detected in the grid power (9), the stored electrical energy is immediately released to provide short-term power to the load, preventing shutdown. It can also be instantly connected and disconnected from the driver (7) to ensure the energy storage device (6) provides current and voltage protection for the driver (7). The specific operation process is as follows:

[0021] Step 1: Power on the motor driver (7) and the inertial mechanical energy storage device of the beam pumping unit starts to work.

[0022] Step 2: The energy storage and release monitoring unit (1) starts to detect the three-phase voltage of the power grid, DClink voltage, ambient and storage and release temperature and energy storage and release unit (2) storage and release voltage. After the detection is completed, record the current initial state data of the device and proceed to step 3.

[0023] Step 3: Based on the measured voltage data of the energy storage unit (2), charge it to bring it close to the DClink voltage of the controller. After charging is completed, the energy storage control unit (3) is connected to the motor driver (7), and the energy storage unit (2) is ready to charge and discharge at any time;

[0024] Step four, when the energy storage monitoring unit (1) detects that the motor (10) appears "reverse power generation" phenomenon, the energy storage control unit (3) controls the energy storage unit (2) to start absorbing electric energy, and when the absorption is saturated, the energy storage protection unit (5) intervenes to stop absorbing electric energy. The energy storage meter display unit (4) records the electric quantity absorbed this time;

[0025] Step five, according to the voltage and current of the network (9), the electric energy is connected and released at any time. When the energy storage monitoring unit (1) detects that the network (9) appears "temporary drop" or "instantaneous stop" and other abnormal states, the energy storage control unit (3) controls the energy storage unit (2) to release electric energy instantaneously, so as to avoid the intervention of the driver (7) protection and the stop of the beam pumping unit (11). The energy storage meter display unit (4) records the electric quantity released this time, and thus, a charging and discharging work cycle is completed;

[0026] Step six, the device returns to step two and works in this cycle;

[0027] The present application fully considers and solves the adverse factors of the inertial mechanical energy of the beam pumping unit on the power grid equipment, and fully recycles the electric energy converted from the mechanical energy, which is very suitable for improving the "stealing stop" phenomenon caused by the imbalance of the beam pumping unit, not only effectively improves the operation time rate, but also saves useful power and protects the power grid.

[0028] Finally, it should be pointed out that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A beam-type pumping unit inertial mechanical energy storage device, characterized in that, It includes: The energy storage device (6) is composed of an energy storage monitoring unit (1), an energy storage control unit (3), an energy storage protection unit (5), an energy storage meter display unit (4) and an energy storage unit (2); The energy storage device (6) is connected in parallel with the driver (7) in the pumping unit control cabinet, and can realize instantaneous access and disconnection with the driver (7), ensuring that the energy storage device (6) protects the current and voltage of the driver (7).

2. The inertial mechanical energy storage device of a beam-type pumping unit, according to claim 1, characterized in that, The energy storage monitoring unit (1) can realize real-time detection of three-phase voltage of power grid, DC link measurement, environment and storage temperature detection and storage voltage detection, and provide data instructions for the working state of the energy storage control unit (3).

3. The inertial mechanical energy storage device of a beam-type pumping unit, according to claim 1, characterized in that, The energy storage control unit (3) can realize absorption current control according to the real-time detection information of the energy storage monitoring unit (1), including charging and discharging current, functional charging and discharging current. At the same time, it controls the access or disconnection of the driver, voltage protection control and module voltage detection functions.

4. The inertial mechanical energy storage device of a beam-pumping unit of claim 1, characterized in that The energy storage protection unit (5) can realize protection functions such as leakage, discharge, overvoltage, undervoltage, overcurrent and abnormal network voltage, effectively protect the driver, and prevent the beam pumping unit (11) from stopping due to abnormal conditions such as "temporary drop" of network power (9).

5. The inertial mechanical energy storage device of a beam-pumping unit of claim 1, characterized in that The energy storage meter display unit (4) can realize the measurement, display and storage of absorbed and released electric quantity, including single charging and discharging capacity and total charging and discharging capacity.

6. The inertial mechanical energy storage device of a beam-pumping unit of claim 1, characterized in that The energy storage unit (2) mainly provides energy storage medium, which can be but not limited to super capacitor, fast charging and discharging battery and other media that can realize fast charging and discharging.

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