Power system for oil-electric dual-drive workover rig

Abstract

The application discloses an oil-electric dual-drive workover rig power system, which comprises a first power mechanism arranged at the rear end of a main vehicle, a second power mechanism arranged at the front end of the main vehicle, and a power battery arranged at the two sides of the front end of the main vehicle and used for supplying power for the first driving motor.

Description

Technical Field

[0001] This invention relates to the field of petroleum machinery technology. More specifically, this invention relates to a power system for a dual-drive (oil and electricity) well workover rig. Background Technology

[0002] Conventional dual-drive oil-electric workover rigs utilize both diesel and electric power sources. A power switching device selects between the diesel and electric power units to drive the winch, enabling power switching functionality. In this power system structure, the power outputs of the diesel and electric power units are typically located on the same side of the power switching device, with the winch positioned on the other side. Priority is given to using the well site's grid power to power the electric power unit and drive the winch. In emergency situations or when power is unavailable, the power switching device switches the power path, allowing the diesel power unit to drive the winch.

[0003] However, in actual use, diesel engines suffer from high fuel consumption and low operating efficiency when driving winches. Therefore, the actual use of diesel-powered generator sets to drive winches is extremely rare. They are primarily used to drive the main rig during driving operations, leaving the diesel-powered generator sets idle for extended periods during workover rig operations, resulting in significant resource waste. Furthermore, without energy storage devices (such as power batteries), the electric-powered generator sets heavily rely on the well site grid power supply, making the workover rig's operation susceptible to grid instability and coverage limitations. Neither drive mode can recover energy, leading to low energy utilization. Moreover, if energy storage devices are directly added to the existing workover rig power system, the limited space on the main rig platform makes it difficult to find sufficient space for power batteries within the existing diesel / electric generator set-power switching device-winch kinetic energy transmission structure. They would typically need to be placed in the generator room or control room, severely limiting battery size and capacity, and also hindering the hybrid layout of the main rig chassis.

[0004] To solve the above technical problems, it is necessary to design a power system for oil-electric dual-drive workover rigs to improve the applicability of workover rigs and improve their energy utilization. Summary of the Invention

[0005] The purpose of this invention is to provide a power system for a dual-drive oil-electric well workover rig. By optimizing the composition and layout of the power system, the diesel drive mechanism, the electric drive mechanism, and the power battery are rationally arranged on the same main chassis. In addition to grid power, the power battery or engine can drive the generator to power the first drive motor, which improves the applicability and working stability of the well workover rig and effectively improves energy utilization.

[0006] To achieve these objectives and other advantages according to the present invention, a power system for a dual-drive oil-electric workover rig is provided, comprising: The first power mechanism is located at the rear end of the main vehicle chassis. The first power mechanism includes a first drive motor, which drives the winch main drum to rotate through a reduction gearbox. The second power mechanism is located at the front end of the main vehicle chassis. The second power mechanism includes an engine, a generator, a gearbox, and a transfer case that are continuously arranged from front to back along the length of the main vehicle. The input shaft and output shaft of the gearbox are respectively connected to the output shaft of the engine and the input end of the transfer case. The transfer case is configured to drive the axle or wheels of the main vehicle to rotate. The generator supplies power to the first drive motor under the driving action of the engine. The power battery and the second power mechanism are respectively located on the front sides of the main vehicle chassis. The power battery is used to supply power to the first drive motor and the high-voltage power interface of the well repair machine. The control device is electrically connected to the first power mechanism, the second power mechanism, and the power battery.

[0007] Preferably, in the power system of the oil-electric dual-drive workover rig, the first drive motor includes a dual-winding permanent magnet synchronous motor, which is located on the same side of the gearbox as the winch main drum. The input shaft and output shaft of the gearbox are respectively connected to the input shaft of the gearbox and the rotating shaft of the winch main drum along the width direction of the main vehicle. The dual-winding permanent magnet synchronous motor is located between the transfer case and the winch main drum.

[0008] Preferably, in the power system of the oil-electric dual-drive workover rig, the control device is located between the first power mechanism and the second power mechanism.

[0009] Preferably, in the power system of the oil-electric dual-drive workover rig, the first drive motor includes multiple permanent magnet synchronous motors, which are arranged opposite to the main drum of the winch on both sides of the gearbox. The multiple permanent magnet synchronous motors are arranged in parallel and spaced between the transfer case and the gearbox. The output shaft of any permanent magnet synchronous motor is connected to the input shaft of the gearbox along the length of the main vehicle, and the output shaft of the gearbox is connected to the rotating shaft of the main drum of the winch along the length of the main vehicle.

[0010] Preferably, in the power system of the oil-electric dual-drive workover rig, the control equipment is located on one side of the winch main drum.

[0011] Preferably, in the power system of the oil-electric dual-drive workover rig, the input shaft of the generator is drivenly connected to the output shaft of the engine, or the input shaft of the generator is drivenly connected to the input shaft of the gearbox through a front-mounted power take-off unit.

[0012] Preferably, in the power system of the oil-electric dual-drive workover rig, the transfer case has an L-shaped structure, and it, along with the engine, the generator, and the gearbox, is offset on the driller's side of the main vehicle.

[0013] Preferably, in the power system for the oil-electric dual-drive well workover rig, the transfer case has two input ends, which are located at the ends of the transfer case adjacent to the gearbox and respectively disposed on both sides of the main vehicle chassis. The output shaft of the gearbox is drivenly connected to the first input end of the transfer case, and the power battery is spaced apart at the front end of the transfer case. The power system for the oil-electric dual-drive well workover rig also includes a third power mechanism, which includes a second drive motor located between the power battery and the transfer case and driven by the power battery or the generator. The output shaft of the second drive motor is connected to the second input end of the transfer case.

[0014] The present invention has at least the following beneficial effects: 1. This invention optimizes the composition and layout of the power system, rationally arranging the diesel drive mechanism, electric drive mechanism, and power battery on the same main chassis. In addition to grid power, the power battery or engine can drive the generator to power the first drive motor. Thus, the power supply mode can be flexibly selected and switched according to the actual working conditions, avoiding the situation where the workover rig is overly dependent on grid power. At the same time, it avoids the problems of low efficiency and high fuel consumption that exist when the diesel drive unit directly drives the winch operation through mechanical transmission. It effectively improves energy utilization and greatly improves the applicability and working stability of the workover rig. 2. The first power mechanism and the second power mechanism of the present invention are relatively independent in terms of mechanical connection structure, and only the first drive motor is used to drive the winch to work, which reduces the complexity of power system connection and control, and is conducive to improving the working stability and working efficiency of the winch. 3. The generator of the present invention is located between the engine and the gearbox and generates electricity through the engine, which effectively reduces the power configuration and procurement cost of the generator set and reduces the layout space required for the generator. On this basis, in conjunction with the overall offset structure of the second power mechanism, the layout space of the power system is effectively saved, which is conducive to the rational layout of the power battery in the limited chassis space of the well repair rig.

[0015] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the power system for a dual-drive oil-electric well workover rig according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the power system for a dual-drive oil-electric well workover rig according to another embodiment of the present invention; Figure 3 This is a schematic diagram of the arrangement of the third power mechanism in a power system for a dual-drive oil-electric well workover rig according to another embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. First drive motor; 2. Gearbox; 3. Winch main drum; 4. Engine; 5. Generator; 6. Gearbox; 7. Transfer case; 8. Power battery; 9. Control equipment; 10. Second drive motor. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0019] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] like Figure 1-3 As shown, the present invention provides a power system for a dual-drive oil-electric well workover rig, comprising: The first power mechanism is located at the rear end of the main vehicle chassis. The first power mechanism includes a first drive motor, which drives the winch main drum to rotate through a reduction gearbox. The second power mechanism is located at the front end of the main vehicle chassis. The second power mechanism includes an engine, a generator, a gearbox, and a transfer case that are continuously arranged from front to back along the length of the main vehicle. The input shaft and output shaft of the gearbox are respectively connected to the output shaft of the engine and the input end of the transfer case. The transfer case is configured to drive the axle or wheels of the main vehicle to rotate. The generator supplies power to the first drive motor under the driving action of the engine. The power battery and the second power mechanism are respectively located on the front sides of the main vehicle chassis. The power battery is used to supply power to the first drive motor and the high-voltage power interface of the well repair machine. The control device is electrically connected to the first power mechanism, the second power mechanism, and the power battery.

[0021] In the above technical solution, the first power mechanism is an electric drive unit and the second power mechanism is an oil drive unit. In terms of mechanical drive structure, the first power mechanism is used only as a power source to drive the winch, and the second power mechanism is used only as a power source to drive the main vehicle. Thus, the two power mechanisms can be staggered and arranged relatively independently along the length direction within the limited space of the main vehicle chassis (located at both ends of the main vehicle chassis), leaving sufficient usable space for the installation of each power mechanism and other power system components. Meanwhile, for the oil-powered generator set (second power mechanism), a new energy generator set (i.e., generator) is added between the conventional engine and gearbox drive structure. This generator can supply power to the electric-powered generator set (first drive motor) under the direct / indirect drive of the engine. The power of this generator is roughly equivalent to that of the engine. When operating in well sites with poor grid power and requiring generator power, the engine of this second power mechanism can be started to drive the generator to generate electricity for the normal operation of the first power mechanism. This indirect drive method, which converts the engine's mechanical energy into electrical energy, effectively avoids the inefficiency and high oil consumption associated with diesel-powered generator sets directly driving winches via mechanical transmission. To address issues such as high energy consumption, the power configuration and procurement costs of the generator set are effectively reduced, as is the required layout space for the generator. Based on this, the engine, generator, gearbox, and transfer case of the second power mechanism are arranged in a straight line along the length of the main vehicle. Since the second power mechanism is separate from the first power mechanism (not needing to be located at the same end of the main vehicle), it can be easily offset to one side of the main vehicle chassis, providing ample space on the other side for a large-capacity power battery. This achieves a reasonable and compact layout of the three power sources (oil-driven generator set, electric-driven generator set, and power battery) within the limited chassis space of the workover rig. This structure also facilitates the wiring harness arrangement between electrically connected mechanical devices. When the workover rig winch is operating, different power sources can be flexibly selected / switched to power the first drive motor according to actual working conditions, avoiding excessive reliance on grid power. Furthermore, while the power battery serves as a new power source for the first power mechanism, it can also act as an energy storage unit to recover the gravitational potential energy generated during the lowering of the workover rig tubing, further improving energy utilization. Specifically, utilizing the reversible characteristics of the motor, when the tubing string is lowered, the lowered weight drags the winch and the first drive motor in reverse. At this time, the control equipment can automatically identify the working status of the workover rig and control the motor to enter the "generating state". The generated AC power is rectified into DC power by the bidirectional inverter to charge the power battery. When the winch needs high power output, the power battery can be discharged through the bidirectional inverter and used as an auxiliary input to power the first drive motor together with the well site grid power supply / generator. This reduces the real-time load and energy consumption of the main grid or generator, and ensures that the first drive motor works efficiently and stably, achieving better energy-saving and efficiency-enhancing effects.

[0022] In this embodiment, the control equipment includes a main vehicle drive controller, a winch drive control cabinet, a turntable drive control cabinet, a capacitor and reactor cabinet, etc. Each control cabinet integrates the controller for the corresponding mechanical equipment. The control functions of the first power mechanism are mainly integrated in the winch drive control cabinet, while the control functions of the second power mechanism and the power battery are mainly integrated in the main vehicle drive controller. Data transmission between the controllers is achieved through the vehicle communication network. Power supply switches are provided on the transmission lines between the generator, the power battery, the well site grid power supply, and the first drive motor, which are electrically connected to the corresponding control equipment. The control equipment can receive the working data of each mechanical device and automatically identify the real-time working status of the workover rig. Based on this, it automatically controls / adjusts the overall working mode of the workover rig and the working status of each mechanical device. Specifically, when the main vehicle is in motion, the engine drives the main vehicle axle through the gearbox and transfer case to ensure the normal driving capability of the vehicle. At the same time, it drives the generator to charge the power battery through a bidirectional inverter, converting a portion of the engine's mechanical energy into electrical energy and storing it in the power battery. During winch operation, there are three power supply modes. When the grid power supply is stable, the grid power supply mode is preferred. The first power unit is connected to the well site grid power supply by closing the corresponding power switch to ensure the first drive motor operates normally. When the well site grid power supply is unstable (e.g., severe voltage fluctuations, insufficient actual supply voltage, etc.) or the well site lacks grid power access conditions, the generator power supply mode can be selected. The generator is powered on by closing the corresponding power switch to supply power to the first drive motor. At this time, the gearbox's mechanical gear is in neutral, and the hydraulic torque converter operates with some loss of oil churning power, but this does not affect the generator's full power output or the gearbox's cooling. When the grid power configuration is poor and the engine is not ready to operate (e.g., the engine's remaining fuel level reaches the set warning range), the power battery power supply mode can be selected. The first power unit is connected to the power battery power supply by closing the corresponding power switch. Furthermore, in both grid power supply and generator power supply modes, when the instantaneous power demand of the winch operation exceeds the power supply capacity limit, the power battery power supply can also be connected simultaneously for auxiliary power supply to meet the workover rig's operating needs. The control equipment also includes a control terminal, which is electrically connected to each controller. The control terminal includes a display and an input device (which can be integrated into a touch screen display). It is used to display the working parameters of each mechanical device. At the same time, construction personnel can input control commands through the input device to assist in selecting or adjusting the working mode of each mechanical device (such as power supply mode), thereby better guiding on-site construction.

[0023] In another technical solution, the power system for the oil-electric dual-drive workover rig includes a first drive motor comprising a dual-winding permanent magnet synchronous motor, which is located on the same side of the gearbox as the winch main drum. The input shaft and output shaft of the gearbox are respectively connected to the input shaft of the gearbox and the rotating shaft of the winch main drum along the width direction of the main vehicle. The dual-winding permanent magnet synchronous motor is located between the transfer case and the winch main drum.

[0024] The control device is located between the first power mechanism and the second power mechanism.

[0025] In the above technical solution, the first power mechanism adopts a permanent magnet synchronous series motor drive method, specifically, as follows: Figure 1 As shown, the reduction gearbox is a single-speed gear reduction gearbox. A four-speed automotive-grade reducer is also provided between the reduction gearbox and the dual-winding permanent magnet synchronous motor. Power is transmitted and the winch is driven via a path of dual-winding permanent magnet synchronous motor-reducer-reduction gearbox. In this structure, the axial length of the first drive motor is relatively long. Therefore, it is arranged horizontally parallel to the main drum of the winch on the same side of the reduction gearbox, so that the first power mechanism and the main drum of the winch together form a compact and reasonable winch drive module. At the same time, the longitudinal (main vehicle length direction) length of the winch drive module is effectively shortened, allowing the control equipment to be arranged in the electrical control room between the first and second power mechanisms, facilitating integrated control of the various mechanical devices and power batteries of the first and second power mechanisms. The main vehicle drive controller can be installed in the electrical control room, or it can be installed near the main vehicle cab or on the chassis frame close to the cab (i.e., the front end of the main vehicle).

[0026] Taking the XJ2250DB workover rig as an example, to achieve both a maximum hook load of 2250kN and a maximum empty hook speed at the motor's rated speed, a 1150kW AC variable frequency motor and a gearbox with a reduction ratio of 7.0 are required. However, to achieve the same maximum hook load and empty hook speed, the aforementioned dual-winding permanent magnet synchronous motor drive scheme only requires a 2×300kW dual-winding permanent magnet synchronous motor reducer assembly and a gearbox with a reduction ratio of 5.0. Compared to the AC variable frequency motor, the motor power is reduced by 50%, the motor weight by 67%, and the gearbox weight by 25%, significantly reducing the overall weight of the workover rig and the load on the front and rear axles. Furthermore, the dual-winding series configuration allows for single-winding operation under low load conditions, controlled by appropriate control equipment (such as a motor controller), which helps improve equipment load rate and saves power consumption.

[0027] In another technical solution, the power system for the oil-electric dual-drive workover rig includes a first drive motor comprising multiple permanent magnet synchronous motors, which are arranged opposite to the main drum of the winch on both sides of the reduction gearbox. The multiple permanent magnet synchronous motors are arranged in parallel and spaced between the transfer case and the reduction gearbox. The output shaft of any permanent magnet synchronous motor is connected to the input shaft of the reduction gearbox along the length of the main vehicle, and the output shaft of the reduction gearbox is connected to the rotating shaft of the main drum of the winch along the length of the main vehicle.

[0028] The control device is located on one side of the winch's main drum.

[0029] In the above technical solution, the first power mechanism adopts a permanent magnet synchronous motor drive method, specifically, as follows: Figure 2 As shown, the reduction gearbox is a combined gear reduction gearbox, a multi-input, single-output gear combined gearbox. The speed ratio of the reduction gearbox is further reduced, and the thickness of the gearbox is reduced. Each permanent magnet synchronous motor is arranged in parallel and connected in parallel on the input side of the reduction gearbox. Each permanent magnet synchronous motor is a permanent magnet synchronous motor with a reduction gear assembly. The number of permanent magnet synchronous motors can be selected according to the power of the winch. Without changing the power of individual motors, it can drive a winch with higher power. At the same time, to ensure that the winch is not too wide when installed on the vehicle, the winch drum is changed from horizontal to vertical. The output shaft of the permanent magnet synchronous motor is also adapted to be vertical, that is, set along the length of the main vehicle. The hydraulic disc brake is changed to a pneumatic caliper disc brake, and the disc brake hydraulic station is removed. After the winch drum is vertically positioned, the reduction gearbox is located between the first drive motor and the main winch drum, freeing up the space on the side of the main winch drum (horizontal) for the arrangement of control equipment (electrical control room), saving longitudinal space on the main vehicle chassis. Similarly, the main vehicle drive controller can be installed in the electrical control room, or it can be installed on the chassis frame near the driver's cab or close to the driver's cab (i.e., the front end of the main vehicle).

[0030] In another technical solution, in the power system of the oil-electric dual-drive well workover rig, the input shaft of the generator is driven to the output shaft of the engine, or the input shaft of the generator is driven to the input shaft of the gearbox through a front-mounted power take-off unit.

[0031] In one configuration, where the generator's input shaft is connected to the engine's output shaft, the engine's output shaft and the gearbox's input shaft are coaxially and fixedly connected to both ends of the same drive shaft via couplings. The generator is connected in series between the engine and the gearbox, meaning the generator is driven by the drive shaft, which extends through the generator housing to the rear end to drive the gearbox. In another configuration, where the generator's input shaft is connected to the gearbox's input shaft via a front-mounted power take-off (PTO), the generator is located between the engine and the gearbox but is not directly connected to the engine's output shaft. Instead, it obtains power through a PTO located at the front end of the gearbox, thus achieving a drive connection with the gearbox's input shaft.

[0032] In another technical solution, the power system for the oil-electric dual-drive workover rig has an L-shaped transfer case, which, along with the engine, the generator, and the gearbox, is offset on the driller's side of the main vehicle.

[0033] In the above technical solutions, such as Figure 1-2 As shown, the second power unit is offset to one side of the main vehicle, leaving ample installation space for the power battery on the other side. This power battery can supply power to the first drive motor and other high-voltage electrical equipment on the workover rig. In the event of unstable grid power supply, it can be used together with the generator as a new power source to power the winch for normal operation. Furthermore, since it takes time for the engine to start and drive the generator, in the event of a sudden power outage, the power battery can be used to supply power to the first drive motor first, and then switched to generator power supply mode once the generator is operating stably.

[0034] In another technical solution, the power system for the oil-electric dual-drive well workover rig has a transfer case with two input ends located at the ends of the transfer case adjacent to the gearbox and respectively located on both sides of the main vehicle chassis. The output shaft of the gearbox is connected to the first input end of the transfer case. The power battery is spaced at the front end of the transfer case. The power system for the oil-electric dual-drive well workover rig also includes a third power mechanism, which includes a second drive motor located between the power battery and the transfer case and driven by the power battery or the generator. The output shaft of the second drive motor is connected to the second input end of the transfer case.

[0035] In the above technical solutions, such as Figure 3As shown, the transfer case is a parallel transfer case, with both input terminals located at the front end and positioned on either side of the main vehicle chassis. This allows the engine, generator, and transmission to form an offset structure when connected to the first input terminal of the transfer case. Simultaneously, the second input terminal of the transfer case is directly opposite the power battery. By changing the installation direction or internal module arrangement of the power battery, its longitudinal (main vehicle length) length can be appropriately reduced, leaving space between the power battery and the second input terminal of the transfer case for installing a second drive motor, thus achieving a hybrid layout scheme for the main vehicle chassis. In practical applications, the third power mechanism is electrically connected to the control equipment (main vehicle drive controller). When the main vehicle is in motion, the control equipment can select either the first power mechanism (hydraulic drive) or the third power mechanism (electric drive) to drive the main vehicle, realizing the hybrid driving function of the main vehicle.

[0036] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A power system for a dual-drive (oil and electricity) well workover rig, characterized in that, include: The first power mechanism is located at the rear end of the main vehicle chassis. The first power mechanism includes a first drive motor, which drives the winch main drum to rotate through a reduction gearbox. The second power mechanism is located at the front end of the main vehicle chassis. The second power mechanism includes an engine, a generator, a gearbox, and a transfer case that are continuously arranged from front to back along the length of the main vehicle. The input shaft and output shaft of the gearbox are respectively connected to the output shaft of the engine and the input end of the transfer case. The transfer case is configured to drive the axle or wheels of the main vehicle to rotate. The generator supplies power to the first drive motor under the driving action of the engine. The power battery and the second power mechanism are respectively located on the front sides of the main vehicle chassis. The power battery is used to supply power to the first drive motor and the high-voltage power interface of the well repair machine. The control device is electrically connected to the first power mechanism, the second power mechanism, and the power battery.

2. The power system for a dual-drive oil-electric well workover rig as described in claim 1, characterized in that, The first drive motor includes a dual-winding permanent magnet synchronous motor, which is located on the same side of the winch main drum as the gearbox. The input shaft and output shaft of the gearbox are respectively connected to the input shaft of the gearbox and the rotating shaft of the winch main drum along the width direction of the main vehicle. The dual-winding permanent magnet synchronous motor is located between the transfer case and the winch main drum.

3. The power system for a dual-drive oil-electric well workover rig as described in claim 2, characterized in that, The control device is located between the first power mechanism and the second power mechanism.

4. The power system for a dual-drive oil-electric well workover rig as described in claim 1, characterized in that, The first drive motor includes multiple permanent magnet synchronous motors, which are arranged opposite to the main drum of the winch on both sides of the reduction gearbox. The multiple permanent magnet synchronous motors are arranged in parallel and spaced between the transfer case and the reduction gearbox. The output shaft of any permanent magnet synchronous motor is connected to the input shaft of the reduction gearbox along the length of the main vehicle, and the output shaft of the reduction gearbox is connected to the rotating shaft of the main drum of the winch along the length of the main vehicle.

5. The power system for a dual-drive oil-electric well workover rig as described in claim 4, characterized in that, The control equipment is located on one side of the winch's main drum.

6. The power system for a dual-drive oil-electric well workover rig as described in claim 1, characterized in that, The input shaft of the generator is driven to the output shaft of the engine, or the input shaft of the generator is driven to the input shaft of the gearbox via a front-mounted power take-off unit.

7. The power system for a dual-drive oil-electric well workover rig as described in claim 1, characterized in that, The transfer case has an L-shaped structure and is offset on the driller's side of the main vehicle along with the engine, the generator, and the gearbox.

8. The power system for a dual-drive oil-electric well workover rig as described in claim 1, characterized in that, The transfer case has two input ends, which are located at the ends of the transfer case adjacent to the gearbox and respectively on both sides of the main vehicle chassis. The output shaft of the gearbox is drivenly connected to the first input end of the transfer case. The power battery is spaced at the front end of the transfer case. The power system for the oil-electric dual-drive well workover rig also includes a third power mechanism, which includes a second drive motor located between the power battery and the transfer case and driven by the power battery or the generator. The output shaft of the second drive motor is connected to the second input end of the transfer case.

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