Skid-mounted electric workover rig

Abstract

The utility model discloses a skid-mounted electric workover rig, which comprises a skid-mounted chassis, and a power assembly, a derrick assembly, a winch assembly, a support assembly and an air pressure assembly which are arranged on the skid-mounted chassis, the skid-mounted electric workover rig adopts a modular design, the power assembly comprises a driving motor and a battery pack, the driving motor is in transmission connection with a main roller through an angle transmission box and a chain box, and the main roller is in transmission connection with the derrick assembly. The battery pack provides an electric power source for the driving motor and the hook driver, the supporting assembly is used for supporting the skid-mounted chassis and guaranteeing the operation stability of the workover rig, the air pressure assembly provides an air pressure source for the air pressure executing mechanism, and the battery pack provides an electric power source for the hydraulic station and the air pressure assembly at the same time. The utility model adopts an electric driving mode, saves energy and reduces emission, the energy consumption is only 1 / 4 of that of the traditional diesel power workover rig, the transmission efficiency is high, no pollution is caused, and the failure rate and the maintenance cost are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas well operation and maintenance equipment and its peripheral supporting facilities, in particular to a skid-mounted electric workover rig. Background Technique

[0002] During the long-term operation of oil and gas wells, various problems such as production decline or shutdown may occur, and regular repair operations and maintenance work are required. These works are called minor repair operations or maintenance operations. A workover rig is the most basic and main power source in workover and downhole operation construction. With the rapid development of the petroleum industry, higher requirements are put forward for workover equipment, which is gradually developing towards automation, cleanliness, and environmental protection.

[0003] The traditional workover rig adopts the power mode of "diesel engine + hydraulic transmission", with many mechanical transmission links and complex structures, which are prone to mechanical problems, have high maintenance costs, and affect the sustainability and progress of operations. Moreover, the noise pollution during operations is relatively serious, which has a certain impact on human health.

[0004] A workover rig is the most commonly used equipment in workover operation construction. The traditional workover rig uses a diesel engine as the power output unit, and drives the rotation of the roller through a multi-stage transmission mechanism such as a power take-off box, a hydraulic torque converter, a universal shaft, an angle box, and a chain box, thereby driving the vertical movement of the traveling block. The traditional workover rig adopts the power mode of "diesel engine + hydraulic transmission", with many mechanical transmission links and complex structures, which are prone to mechanical problems, have high maintenance costs, and affect the sustainability and progress of operations. Moreover, the noise pollution during operations is relatively serious, which has a certain impact on human health. Content of the Utility Model

[0005] The purpose of the utility model is to provide a skid-mounted electric workover rig to solve the problems existing in the above-related technologies. The workover rig is driven by electricity, which is convenient for the operation and maintenance of the workover rig and is conducive to improving the practicability of the workover rig.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a skid-mounted electric workover rig, including a skid-mounted chassis and the following components arranged on the skid-mounted chassis:

[0008] A power assembly, the power assembly includes a drive motor and a battery pack, and the drive motor is electrically connected to the battery pack;

[0009] A derrick assembly, the derrick assembly is rotatably connected to the skid-mounted chassis, and the derrick assembly is located at one end of the skid-mounted chassis;

[0010] A drawworks assembly, the drawworks assembly being disposed near the derrick assembly; the drawworks assembly includes a drawworks frame and a main drum, the main drum being rotatably disposed on the drawworks frame, and the drive motor being drivingly connected to the main drum by means of an angular transmission case and a chain case. A wire rope is wound around the main drum, one end of the wire rope being connected to the main drum. Rotation of the main drum enables winding and releasing of the wire rope. The other end of the wire rope bypasses the derrick assembly and is connected to a traveling block. The traveling block is connected to a hook driver, the hook driver being electrically connected to the battery pack. The traveling block is capable of being connected to a elevating worktable, and the elevating worktable is used for gripping and releasing workover tools for performing repair and maintenance operations on oil and gas wells;

[0011] A support assembly, the support assembly including a plurality of leg cylinders disposed at the bottom of the skid-mounted chassis. Each leg cylinder is connected to a hydraulic station to support the skid-mounted chassis and adjust the level. During transportation of the skid-mounted electric workover rig, the leg cylinders can be folded;

[0012] A pneumatic assembly, the pneumatic assembly being capable of providing a pneumatic source for a pneumatic actuator.

[0013] Preferably, the drive motor adopts a permanent magnet synchronous motor power assembly. The permanent magnet synchronous motor power assembly includes a permanent magnet synchronous motor, a motor cooling system, and a five-speed gearbox. The permanent magnet synchronous motor is drivingly connected to the main drum by means of the five-speed gearbox. The motor cooling system is used for dissipating heat from the permanent magnet synchronous motor. The permanent magnet synchronous motor is electrically connected to the battery pack.

[0014] Preferably, an energy recovery assembly is further disposed on the skid-mounted chassis. The energy recovery assembly includes a transmission mechanism. The transmission mechanism is drivingly connected to the traveling block and is also drivingly connected to the permanent magnet synchronous motor. When the traveling block descends, the transmission mechanism drives the rotor of the permanent magnet synchronous motor to rotate, so as to convert the gravitational potential energy of the traveling block into electric energy and drive the permanent magnet synchronous motor to recover energy as a generator.

[0015] Preferably, the battery pack adopts a lithium iron phosphate battery;

[0016] The number of the battery packs is multiple groups, and the battery packs are detachably connected to the permanent magnet synchronous motor.

[0017] Preferably, a standby power assembly is further disposed on the skid-mounted chassis. The standby power assembly is disposed on the skid-mounted chassis. The standby power assembly includes a hydraulic motor. The hydraulic motor is drivingly connected to the main drum, and the hydraulic motor is connected to the hydraulic station;

[0018] The pneumatic assembly includes an air compressor, and the air compressor and the hydraulic station are both electrically connected to the battery pack.

[0019] Preferably, a thermal management assembly is also provided on the skid-mounted chassis, and the thermal management assembly is used to dissipate heat for the powertrain; the thermal management assembly includes a heat dissipation fan, and the heat dissipation fan is electrically connected to the battery pack.

[0020] Preferably, the derrick assembly comprises a crown block, the crown block is installed on the top of the derrick assembly, the crown block comprises a pulley assembly, and the steel wire rope is connected to the traveling hook after passing around the pulley assembly.

[0021] Preferably, the derrick assembly is also connected to a guy rope, one end of which is connected to the top of the derrick assembly, and the other end of which can be anchored to an anchor point on the working ground.

[0022] Preferably, the skid-mounted electric workover rig further comprises a controller, the power assembly, the winch assembly, the support assembly and the air pressure assembly are all communicatively connected to the controller, and the controller is electrically connected to the battery pack;

[0023] An operating platform is also provided on the skid-mounted chassis.

[0024] Preferably, the battery pack can also be connected to an external charger.

[0025] Compared with the related art, the utility model has achieved the following technical effects: the skid-mounted electric well repair rig of the utility model comprises a skid-mounted chassis and a power assembly, a derrick assembly, a winch assembly, a support assembly and a pneumatic assembly arranged on the skid-mounted chassis, wherein the power assembly comprises a drive motor and a battery pack, and the drive motor is electrically connected to the battery pack; the derrick assembly is rotatably connected to the skid-mounted chassis, and the derrick assembly is located at one end of the skid-mounted chassis; the winch assembly is arranged close to the derrick assembly; the winch assembly comprises a winch frame and a main drum, the main drum is rotatably arranged on the winch frame, and the drive motor is connected to the main drum by an angle transmission box and a chain box, and a steel wire rope is wound around the main drum, and the steel wire rope is wound around the main drum. One end of the wire rope is connected to the main drum, and the rotation of the main drum can realize the winding and releasing of the wire rope. The other end of the wire rope bypasses the derrick assembly and is connected to the traveling hook. The traveling hook is connected to a hook driver, and the hook driver is electrically connected to the battery pack. The traveling hook can be connected to the elevator, and the elevator is used to grab and release the well repair tools to repair and maintain oil and gas wells; the support assembly includes multiple groups of outrigger cylinders arranged at the bottom of the skid-mounted chassis, and each outrigger cylinder is connected to the hydraulic station to support the skid-mounted chassis and adjust the level. During the transportation of the skid-mounted electric well repair rig, the outrigger cylinder can be folded; the pneumatic assembly can provide a source of air pressure for the pneumatic actuator.

[0026] The skid-mounted electric workover rig of the utility model adopts a modular design. The power assembly, derrick assembly, winch assembly, support assembly and air pressure assembly are all arranged on the skid-mounted chassis. The power assembly includes a drive motor and a battery pack. The drive motor is connected to the main drum transmission by an angle transmission box and a chain box to drive the winch assembly and the derrick assembly to work. The battery pack provides a power source for the drive motor and the large hook driver. The support assembly is used to support the skid-mounted chassis to ensure the stability of the workover rig operation. The air pressure assembly provides an air pressure source for the air pressure actuator. The battery pack also provides a power source for the hydraulic station and the air pressure assembly. The skid-mounted electric workover rig of the utility model is an electric drive mode, which saves energy and reduces emissions. The energy consumption is only 1 / 4 of that of the traditional diesel-powered workover rig. It has high transmission efficiency and is pollution-free. The failure rate and maintenance cost will be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the operation of the skid-mounted electric workover rig disclosed in an embodiment of the utility model;

[0029] Figure 2 It is a structural schematic diagram of a skid-mounted electric workover rig disclosed in an embodiment of the utility model;

[0030] Figure 3 It is a schematic structural diagram of the skid-mounted electric workover rig disclosed in the embodiment of the utility model from other perspectives;

[0031] Figure 4 The utility model is a schematic diagram of the transportation of the skid-mounted electric workover rig disclosed in the embodiment.

[0032] In the figure: 100, skid-mounted electric workover rig; 200, flatbed truck;

[0033] 1. Battery pack; 2. Power assembly; 3. Hydraulic station; 4. Winch assembly; 5. Overhead crane; 6. Traveling hook; 7. Elevator; 8. Derrick assembly; 9. Operating table; 10. Main support legs; 11. Rear support legs; 12. Backup power assembly; 13. Universal drive shaft; 14. Cooling fan; 15. Air compressor; 16. Front support legs; 17. Chain box; 18. Angle transmission box; 19. Guy rope. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] The utility model aims to provide a skid-mounted electric workover rig to solve the problems existing in the above-mentioned related technologies. The workover rig is electrically driven, which is convenient for operation and maintenance of the workover rig and is conducive to improving the practicality of the workover rig.

[0036] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] Embodiment 1

[0038] The present embodiment provides a skid-mounted electric workover rig 100, comprising a skid-mounted chassis and a power assembly 2, a derrick assembly 8, a winch assembly 4, a support assembly, and a pneumatic assembly arranged on the skid-mounted chassis, wherein the power assembly 2 comprises a drive motor and a battery pack 1, and the drive motor is electrically connected to the battery pack 1; the derrick assembly 8 is rotatably connected to the skid-mounted chassis, and the derrick assembly 8 is located at one end of the skid-mounted chassis; the winch assembly 4 is arranged close to the derrick assembly 8; the winch assembly 4 comprises a winch frame and a main drum, the main drum is rotatably arranged on the winch frame, and the drive motor is connected to the main drum by an angle transmission box 18 and a chain box 17, a steel wire rope is wound around the main drum, and one end of the steel wire rope is connected to the main drum The main drum is connected, and the rotation of the main drum can realize the winding and releasing of the wire rope. The other end of the wire rope bypasses the derrick assembly 8 and is connected to the traveling hook 6. The traveling hook 6 is connected with a hook driver, and the hook driver is electrically connected to the battery pack 1. The traveling hook 6 can be connected to the elevator 7, and the elevator 7 is used to grab and release the well repairing tools to repair and maintain the oil and gas wells; the support assembly includes a plurality of outrigger cylinders arranged at the bottom of the skid-mounted chassis, and each outrigger cylinder is connected to the hydraulic station 3 to support the skid-mounted chassis and adjust the level. During the transportation of the skid-mounted electric well repairing rig 100, the outrigger cylinders can be folded; the pneumatic assembly can provide a source of air pressure for the pneumatic actuator.

[0039] The skid-mounted electric workover rig 100 of the utility model adopts a modular design. The power assembly 2, the derrick assembly 8, the winch assembly 4, the support assembly and the pneumatic assembly are all arranged on the skid-mounted chassis. The power assembly 2 includes a drive motor and a battery pack 1. The drive motor is connected to the main drum transmission by a universal transmission shaft 13, an angle transmission box 18 and a chain box 17 to drive the winch assembly 4 and the derrick assembly 8 to work. The battery pack 1 provides a power source for the drive motor and the large hook driver. The support assembly is used to support the skid-mounted chassis to ensure the stability of the workover rig operation. The pneumatic assembly provides a pneumatic pressure source for the pneumatic actuator. The battery pack 1 provides a power source for the hydraulic station 3 and the pneumatic assembly at the same time. The skid-mounted electric workover rig 100 of the utility model is an electric drive mode, which saves energy and reduces emissions. The energy consumption is only 1 / 4 of that of the traditional diesel-powered workover rig. It has high transmission efficiency and is pollution-free. The failure rate and maintenance cost will be greatly reduced.

[0040] In this specific embodiment, the driving motor adopts a permanent magnet synchronous motor powertrain, which includes a permanent magnet synchronous motor, a motor cooling system and a five-speed gearbox. The permanent magnet synchronous motor is connected to the main drum transmission by the five-speed gearbox, the motor cooling system is used for heat dissipation of the permanent magnet synchronous motor, and the permanent magnet synchronous motor is electrically connected to the battery pack 1. The permanent magnet synchronous motor powertrain has the characteristics of small size and light weight, and its five-speed gearbox can meet the requirements of different speeds and different hook loads during well repair operations.

[0041] It should be emphasized that an energy recovery assembly is also provided on the skid-mounted chassis, and the energy recovery assembly includes a transmission mechanism, which is transmission-connected to the traveling hook 6, and the transmission mechanism is transmission-connected to the permanent magnet synchronous motor. When the traveling hook 6 descends, the transmission mechanism is used to drive the rotor of the permanent magnet synchronous motor to rotate, so as to convert the gravitational potential energy of the traveling hook 6 into electrical energy, drive the permanent magnet synchronous motor as a generator to recover energy, and store the recovered electrical energy in the battery pack 1. The energy recovery assembly is provided to recover the gravitational potential energy and convert it into electrical energy, thus saving energy and further improving the adaptability of the skid-mounted electric workover rig 100.

[0042] It should also be noted that the battery pack 1 uses lithium iron phosphate batteries, which have the advantages of high operating voltage, high energy density, long cycle life, good safety performance, low self-discharge rate, and no memory effect, so as to further improve the working reliability of the powertrain 2. In other specific embodiments that can be realized by the utility model, other types of battery packs 1 can also be used.

[0043] In actual applications, the number of battery packs 1 can be set to multiple groups, and the battery pack 1 and the permanent magnet synchronous motor can be detachably connected, which is convenient for adjusting the working state of the battery pack 1 and replacing the battery pack 1 according to specific working conditions, and convenient for storing electric energy, further ensuring that the powertrain 2 can provide a stable source of power.

[0044] At the same time, a backup power assembly 12 is also provided on the skid-mounted chassis. The backup power assembly 12 is provided on the skid-mounted chassis. The backup power assembly 12 includes a hydraulic motor, which is connected to the main drum transmission, and the hydraulic motor is connected to the hydraulic station 3. The backup power assembly 12 uses the hydraulic station 3 to provide a power source. When the power assembly 2 fails, the backup power assembly 12 can be used to temporarily output power to drive the winch assembly 4 to move and solve the emergency.

[0045] In practical applications, the pneumatic assembly includes an air compressor 15 , and the air compressor 15 and the hydraulic station 3 are electrically connected to the battery pack 1 , and the battery pack 1 provides a power source for the hydraulic station 3 and the pneumatic assembly.

[0046] In order to ensure the working reliability of the skid-mounted electric well repairing machine 100, a thermal management assembly is also provided on the skid-mounted chassis, and the thermal management assembly is used to dissipate heat for the power assembly 2; the thermal management assembly includes a heat dissipation fan 14, and the heat dissipation fan 14 is electrically connected to the battery pack 1 to solve the heat dissipation problem of working modules such as the power assembly 2.

[0047] Among them, the derrick assembly 8 includes a crown block 5, which is installed on the top of the derrick assembly 8. The crown block 5 includes a pulley assembly. The wire rope passes around the pulley assembly and is connected to the traveling hook 6. The crown block 5 and the traveling hook 6 cooperate to complete the suspension and lifting of the tubing in the well, etc., to ensure the smooth progress of the well repair operation.

[0048] In order to improve the safety factor of the skid-mounted electric servicing rig 100, the derrick assembly 8 is also connected to a guy rope 19, one end of which is connected to the top of the derrick assembly 8, and the other end of the guy rope 19 can be anchored to an anchor point on the working ground to ensure the stability and safety of the servicing rig during operation.

[0049] The skid-mounted electric workover rig 100 of this embodiment also includes a controller, and the power assembly 2, the winch assembly 4, the support assembly and the air pressure assembly are all connected to the controller in communication, and the controller is electrically connected to the battery pack 1; the controller is used to control the working state of each working module to improve the automation level of the workover rig. In this specific embodiment, the controller is set close to the battery pack 1. It should be explained here that the controller and the structure and working mode of the controller are all common means used by those skilled in the art, and will not be repeated here.

[0050] For the convenience of operation, an operating table 9 is also provided on the skid-mounted chassis, and the operation is concentrated on the operating table 9, thereby improving the convenience of operation.

[0051] For convenient charging, the battery pack 1 can also be connected to an external charger to ensure the endurance of the skid-mounted electric workover rig 100 .

[0052] The skid-mounted electric workover rig 100 of the present utility model is based on electricity and is equipped with a power assembly 2 (drive motor + gearbox), replacing the diesel engine, transfer case, and hydraulic torque converter, reducing its transmission chain and improving transmission efficiency. At the same time, due to the motor drive mode adopted, there is no exhaust gas emission and noise pollution after combustion, and the motor maintenance cost and failure rate will be significantly reduced. Due to the characteristics of the motor, it does not consume electric energy when not in use, while diesel power must be constantly started for use. The electrification of the workover rig can effectively solve problems such as environmental protection and energy conservation. At the same time, with the development of new energy technologies, electrification will become another trend in the oil special equipment industry.

[0053] Embodiment 2

[0054] This embodiment provides a workover system, including the skid-mounted electric workover rig 100 of Embodiment 1, and also including a flatbed truck 200 for transporting the skid-mounted electric workover rig 100. During transportation, the leg cylinders of the support assembly are folded and retracted. When arriving at the operation site, the leg cylinders of the support assembly extend and rise to support the skid chassis. In this specific embodiment, the leg cylinders specifically include the main support leg 10, the front support leg 16, and the rear support leg 11. The main support leg 10 is arranged at one end of the derrick assembly 8, and both the front support leg 16 and the rear support leg 11 can extend outside the skid chassis to ensure support stability.

[0055] The workover system of this embodiment saves the cost and supporting expenses of the workover equipment. Since it does not involve the whole vehicle and chassis, there is no need to go through the announcement and filing procedures, nor vehicle annual inspection, and the vehicle inspection and testing expenses can be effectively reduced every year.

[0056] Specific examples are applied in the present utility model to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, based on the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A skid-mounted electric workover rig, characterized in that: It includes a skid-mounted chassis and the following components arranged on the skid-mounted chassis: A powertrain, the powertrain comprising a drive motor and a battery pack, the drive motor being electrically connected to the battery pack; A derrick assembly, the derrick assembly is rotatably connected to the skid-mounted chassis, and the derrick assembly is located at one end of the skid-mounted chassis; A winch assembly, wherein the winch assembly is arranged near the derrick assembly; the winch assembly comprises a winch frame and a main drum, wherein the main drum is rotatably arranged on the winch frame, and the drive motor is connected to the main drum by an angle transmission box and a chain box, a steel wire rope is wound around the main drum, one end of the steel wire rope is connected to the main drum, and the rotation of the main drum can realize the winding and release of the steel wire rope, and the other end of the steel wire rope bypasses the derrick assembly and is connected to a traveling hook, wherein the traveling hook is connected to a hook driver, and the hook driver is electrically connected to the battery pack, and the traveling hook can be connected to an elevator, and the elevator is used to grab and release well repair tools to carry out repair and maintenance operations of oil and gas wells; A support assembly, wherein the support assembly includes a plurality of outrigger oil cylinders arranged at the bottom of the skid-mounted chassis, each of the outrigger oil cylinders is connected to a hydraulic station to support and adjust the level of the skid-mounted chassis, and the outrigger oil cylinders can be folded during the transportation of the skid-mounted electric workover rig; The pneumatic assembly can provide a pneumatic source for the pneumatic actuator.

2. The skid-mounted electric workover rig according to claim 1, characterized in that: The drive motor adopts a permanent magnet synchronous motor power assembly, which includes a permanent magnet synchronous motor, a motor cooling system and a five-speed gearbox. The permanent magnet synchronous motor is connected to the main drum transmission via the five-speed gearbox. The motor cooling system is used for heat dissipation of the permanent magnet synchronous motor. The permanent magnet synchronous motor is electrically connected to the battery pack.

3. The skid-mounted electric workover rig according to claim 2, characterized in that: An energy recovery assembly is also provided on the skid-mounted chassis, and the energy recovery assembly includes a transmission mechanism, which is transmission-connected to the traveling hook, and the transmission mechanism is transmission-connected to the permanent magnet synchronous motor. When the traveling hook descends, the transmission mechanism is used to drive the rotor of the permanent magnet synchronous motor to rotate, so as to convert the gravitational potential energy of the traveling hook into electrical energy, and drive the permanent magnet synchronous motor as a generator to recover energy.

4. The skid-mounted electric workover rig according to claim 2, characterized in that: The battery pack adopts lithium iron phosphate battery; There are multiple battery packs, and the battery packs are detachably connected to the permanent magnet synchronous motor.

5. The skid-mounted electric workover rig according to claim 1, characterized in that: The skid-mounted chassis is also provided with a backup power assembly, which is arranged on the skid-mounted chassis and includes a hydraulic motor, which is transmission-connected to the main drum and connected to the hydraulic station; The pneumatic assembly includes an air compressor, and the air compressor and the hydraulic station are both electrically connected to the battery pack.

6. The skid-mounted electric workover rig according to claim 1, characterized in that: The skid-mounted chassis is also provided with a thermal management assembly, which is used to dissipate heat for the powertrain; the thermal management assembly includes a heat dissipation fan, and the heat dissipation fan is electrically connected to the battery pack.

7. The skid-mounted electric workover rig according to claim 1, characterized in that: The derrick assembly comprises a crown block, which is installed on the top of the derrick assembly. The crown block comprises a pulley assembly, and the steel wire rope is connected to the traveling hook after passing around the pulley assembly.

8. The skid-mounted electric workover rig according to claim 1, characterized in that: The derrick assembly is also connected to a guy rope, one end of which is connected to the top of the derrick assembly, and the other end of which can be anchored at an anchor point on the working ground.

9. The skid-mounted electric workover rig according to any one of claims 1 to 8, characterized in that: Also includes a controller, the power assembly, the winch assembly, the support assembly and the air pressure assembly are all communicatively connected to the controller, and the controller is electrically connected to the battery pack; An operating platform is also provided on the skid-mounted chassis.

10. The skid-mounted electric workover rig according to claim 9, characterized in that: The battery pack can also be connected to an external charger.

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