Truck-mounted drilling rig hybrid power transmission system and method

By adopting a hybrid power transmission system of diesel engine and electric motor in oil drilling rigs, the high energy consumption and high carbon emissions of traditional pure mechanical drive have been solved. This has improved the adaptability and automation of operations under different power conditions, and reduced equipment costs and failure risks.

CN121590263APending Publication Date: 2026-03-03CNPC NATIONAL OIL & GAS DRILLING EQUIPMENT ENGINEERING & TECHNOLOGY RESEARCH CENTER CO LTD +2
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Patent Information

Application Number
CN202411137537.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-19
Publication Date
2026-03-03

AI Technical Summary

Technical Problem

The existing oil drilling and repair vehicles use a purely mechanical drive system, which has high energy consumption, high carbon emissions, and low automation, and cannot meet the energy-saving, low-carbon and automated requirements of oilfield equipment.

Method used

The system employs a hybrid power transmission system that combines a diesel engine and an electric motor. The electric motor generates electricity, which is stored in a high-power battery. The electric motor is then driven by an AC variable frequency control system, enabling power switching and parallel drive. Combined with a parallel transfer case, a power switching case, and a gear transmission case, the system allows for the switching and distribution of multiple power sources.

Benefits of technology

It achieves operational adaptability under different power supply conditions, reduces energy consumption and carbon emissions, improves automation, reduces equipment costs and downtime risks, and simplifies the winch structure.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a truck-mounted drilling rig hybrid power transmission system which comprises a power system, and the power system comprises a diesel engine, an alternating-current variable-frequency motor I and a motor II. A diesel engine is connected with a gearbox and drives a motor I to generate electricity through a parallel operation transfer case, the electricity generated by the motor I is stored in a high-power battery, the high-power battery outputs electric power to drive a motor II after passing through an alternating-current frequency conversion control system, and the parallel operation transfer case is connected with a power switching box through a coupler III. The motor II is connected with a winch drum through a power switching box and a gear transmission box; according to the hybrid power transmission method, two power modes of the diesel engine, the motor I and the motor II are adopted, the power of the diesel engine can serve as driving force of a winch roller and can also drive the motor I to generate electricity, and the diesel engine and the motor II can directly drive the winch roller. When the diesel engine is used as main power to drive the winch drum, the motor II can be used as an energy consumption braking device.
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Description

Technical Field

[0001] This invention belongs to the technical field of power transmission systems for oilfield vehicle-mounted drilling and repair rigs, specifically relating to hybrid power transmission systems for vehicle-mounted drilling rigs, and also to hybrid power transmission methods for vehicle-mounted drilling rigs. Background Technology

[0002] Currently, the common transmission method used in oil drilling and workover rigs consists of one or two diesel engines matched with a hydraulic transmission box, with power output distributed via a transfer case. The upper power output port of the transfer case goes through a driveshaft to the angle transmission box, then through a chain box to the winch to drive the main drum for hoisting operations during drilling. The middle power output port of the transfer case, via a driveshaft, directly drives the turntable through the turntable transmission box and vertical chain box to achieve rotating drilling operations. The two lower power output ports of the transfer case are distributed by driveshafts to the front and rear axles of the chassis, driving the wheels to move the rig. Drum clutches and auxiliary brakes are installed on both sides of the winch drum, while the main winch brake is installed on the drum body. The disadvantages of this traditional transmission method are that it uses a purely mechanical diesel engine drive, resulting in high energy consumption, high carbon dioxide emissions, low operating efficiency, and low automation, failing to meet the growing demands of oilfield equipment for automation, energy saving, and low carbon emissions. Summary of the Invention

[0003] The purpose of this invention is to provide a hybrid power transmission system for vehicle-mounted drilling rigs, which solves the problem of high energy consumption caused by the use of purely mechanical drive in oil drilling and production vehicle-mounted systems.

[0004] Another objective of this invention is to provide a hybrid power transmission method for vehicle-mounted drilling rigs.

[0005] The first technical solution adopted in this invention is: a vehicle-mounted drilling rig hybrid power transmission system, including a power system comprising a diesel engine, an AC variable frequency motor I, and a motor II; the diesel engine is connected to a gearbox, and the diesel engine drives motor I to generate electricity through a parallel transfer case. The electricity generated by motor I is stored in a high-power battery, and the power output from the high-power battery drives motor II after passing through the AC variable frequency control system. The parallel transfer case is connected to a power switching box through a coupling III; motor II is connected to the winch drum through the power switching box and a gear transmission box.

[0006] The power output of the power system is divided into three parts: the first part is used to drive the winch drum, the second part is used to drive the turntable, and the third part is used to drive the front and rear drive axles of the wheels.

[0007] The invention is further characterized in that the electric motor I is connected to the parallel transfer case via coupling IV, and the gear sleeve I in the parallel transfer case is used to switch the power output source; the diesel engine is connected to the parallel transfer case via coupling V, and the gear sleeve II in the parallel transfer case is used to switch the power source; the gear sleeve I and gear sleeve II can switch the power to be driven by the diesel engine or the electric motor I alone, or by the diesel engine and the electric motor I in parallel.

[0008] Motor II is connected to the power switching box via coupling II. Clutch I connected to the power switching box is used to switch whether the power source is motor II, and clutch II is used to switch whether the power source is the parallel transfer case.

[0009] The power switching box is connected to the gear transmission box via coupling I. Clutch I and clutch II connected to the power switching box are used for power switching.

[0010] The front drive axle is connected to the parallel transfer case via coupling VI, and the rear drive axle is connected to the parallel transfer case via coupling VII; the gear sleeve III in the parallel transfer case is used to switch the power output of the front drive axle.

[0011] The second solution adopted in this invention is a hybrid power transmission method for a vehicle-mounted drilling rig, employing two power sources: a diesel engine and electric motor I and electric motor II. The diesel engine can both drive the winch drum and power electric motor I to generate electricity. Both the diesel engine and electric motor II can directly drive the winch drum. When the diesel engine is used as the primary power source to drive the winch drum, electric motor II can be used as an energy-saving braking device. The specific operating steps are as follows:

[0012] Transmission methods are specifically divided into mechanical drive conditions, grid power conditions, emergency conditions, and driving conditions:

[0013] Under grid power conditions:

[0014] ① The diesel engine is only used for emergency purposes. Under normal working conditions, the grid power is directly driven by the motor II through the AC frequency converter to drive the winch drum and turntable for operation.

[0015] Under mechanical drive conditions:

[0016] ① The diesel engine outputs power through the parallel transfer case and then through the power switching case to drive the winch drum and turntable for operation;

[0017] When the diesel engine is under light load, the excess power is converted into electrical energy by the generator of electric motor I and stored in a large-capacity battery.

[0018] When the diesel engine is under heavy load, the electric motor I, powered by the electrical energy stored in the large-capacity battery, drives the winch drum and turntable in parallel with the diesel engine power to perform the operation.

[0019] Emergency operating conditions:

[0020] ① When motor II fails under grid power conditions, motor II is disengaged by clutch I in the power switching box, and the power input is switched to the parallel transfer box by clutch II in the power switching box, switching the drive motor to motor I; the grid power directly drives motor I after passing through the AC frequency converter, and the power of motor I drives the winch drum and turntable for operation after passing through the parallel transfer box and the power switching box;

[0021] ② When both motor I and motor II fail under grid power conditions, motor II is disengaged through clutch I in the power switching box, and the power input is switched to the parallel transfer case through clutch II in the power switching box. Motor I is disengaged through gear ring II in the parallel transfer case. The power of the diesel engine drives the winch drum and turntable for operation after passing through the parallel transfer case and the power switching box.

[0022] Operating conditions:

[0023] When the vehicle-mounted drilling rig is traveling on the highway, the power of the diesel engine drives the front and rear drive axles through the parallel transfer case; or the electrical energy stored in the large-capacity battery drives the electric motor I through the control system, and the power of the electric motor I drives the front and rear drive axles through the parallel transfer case.

[0024] When the winch drum decelerates, it can be braked by motor II and the energy on the winch drum can be recovered by the power generation function of motor II.

[0025] The beneficial effects of this invention are:

[0026] 1. It adopts both diesel engine and electric motor as power sources, which can meet the operation needs of well sites with different power supply conditions; well sites with grid power access use grid power drive, while those without grid power access use diesel engine drive, which has strong operational adaptability;

[0027] 2. The diesel engine can be used as the driving force for the winch or to drive the electric motor to generate electricity. When there is no grid power connection at the well site, the diesel engine drives the electric motor I to generate electricity, which is used to drive the electric motor II as the power source for the winch. This reduces the number of auxiliary diesel engines required and saves equipment costs.

[0028] 3. The diesel engine can directly drive the winch. When the main drive motor II of the winch fails, the winch can be operated by directly driving the diesel engine; reducing downtime losses and downhole risks caused by failure, and has strong risk resistance.

[0029] 4. Electric motor II can be used as an energy-consuming braking motor. When a diesel engine is used as the main power to drive the winch, electric motor II can be used as a braking motor, eliminating the need for clutches and auxiliary brakes installed on both sides of the drum, reducing the winch width, and making it easier to install on the vehicle.

[0030] 5. The parallel transfer case, power switching case and gear transmission case are connected by couplings, which have high reliability and maintainability, and are convenient for maintenance and retrofitting of old equipment. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the hybrid power transmission system for the vehicle-mounted drilling rig of the present invention;

[0032] In the diagram, 1. Diesel engine, 2. Electric motor I, 3. Electric motor II, 4. Parallel transfer case, 5. Power switching box, 6. Gear transmission box, 7. Winch drum, 8. Gear sleeve I, 9. Gear sleeve II, 10. Clutch I, 11. Clutch II, 12. Gear sleeve III, 13. Front drive axle, 14. Rear drive axle, 15. Coupling I, 16. Coupling II, 17. Coupling III, 18. Coupling IV, 19. Coupling V, 20. Coupling VI, 21. Coupling VII, 22. Turntable. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0034] Example 1

[0035] This invention provides a hybrid power transmission system for vehicle-mounted drilling rigs, such as... Figure 1 As shown, the system includes a power system comprising a diesel engine 1, an AC variable frequency motor I2, and a motor II3. The diesel engine 1 is connected to a gearbox and drives the motor I2 to generate electricity via a parallel transfer case 4. The electricity generated by the motor I2 is stored in a high-power battery, and the power output from the high-power battery drives the motor II3 via the AC variable frequency control system. The parallel transfer case 4 is connected to a power switching case 5 via a coupling III17. The motor II3 is connected to the winch drum 7 via the power switching case 5 and a gear transmission case 6.

[0036] The power output of the power system is divided into three parts: the first part is used to drive the winch drum 7, the second part is used to drive the turntable 22, and the third part is used to drive the front drive axle 13 and the rear drive axle 14.

[0037] Example 2

[0038] Based on Example 1,

[0039] Electric motor I2 is connected to parallel transfer case 4 via coupling IV18. Gear sleeve I8 in parallel transfer case 4 is used to switch the power output source. Diesel engine 1 is connected to parallel transfer case 4 via coupling V19. Gear sleeve II9 in parallel transfer case 4 is used to switch the power source. Gear sleeve I8 and gear sleeve II9 can switch the power to diesel engine 1 or electric motor I2 alone, or diesel engine 1 and electric motor I2 in parallel.

[0040] Motor II3 is connected to power switching box 5 via coupling II16. Clutch I10 connected to power switching box 5 is used to switch whether the power source is motor II3, and clutch II11 is used to switch whether the power source is parallel transfer case 4.

[0041] The power switching box 5 is connected to the gear transmission box 16 via coupling I15. Clutch I10 and clutch II11 connected to the power switching box 5 are used for power switching.

[0042] The front drive axle 13 is connected to the parallel transfer case via coupling VI 20, and the rear drive axle 14 is connected to the parallel transfer case via coupling VII 21; the gear sleeve Ⅲ 12 in the parallel transfer case 4 is used to switch the power output of the front drive axle 13.

[0043] Example 3

[0044] The hybrid power transmission system for vehicle-mounted drilling rigs of this invention is adaptable to various well site conditions. The transmission method is specifically divided into four operating conditions: mechanical drive, grid power, emergency response, and driving.

[0045] Under grid power conditions:

[0046] ① The diesel engine 1 is only used for emergency purposes. When the well site has sufficient grid power supply, pure electric operation can be adopted. The grid power is directly driven by the motor II 3 after passing through the AC frequency converter. The output power is then driven by the power switching box and gear transmission box to drive the winch drum 7 and turntable 22 to carry out the operation, realizing the hoisting and lowering of the winch. At this time, the potential energy of the winch drum when it is lowered can be stored in the high-power battery through the motor II 3, reducing energy consumption and can be used for emergency purposes.

[0047] Under mechanical drive conditions:

[0048] ①When the well site does not have grid power access, the diesel engine 1 outputs power through the parallel transfer case 4 and then through the power switching case 5 to drive the winch drum 7 and turntable 22 for operation;

[0049] When the diesel engine 1 is under light load, the excess power is converted into electrical energy by the power generation capacity of the electric motor I2 and stored in a large-capacity battery;

[0050] When the diesel engine 1 is under heavy load, the electric motor I2 drives the power output of the electric energy stored in the large-capacity battery to drive the winch drum 7 and turntable 22 in parallel with the power of the diesel engine 1 for operation;

[0051] Emergency operating conditions:

[0052] ① When motor II3 fails under grid power conditions, motor II3 is disengaged through clutch I10 in power switching box 5, and power input is switched to parallel transfer box 4 through clutch II11 in power switching box 5, switching the drive motor to motor I2; grid power directly drives motor I2 after passing through AC frequency converter controller, and the power of motor I2 drives winch drum 7 and turntable 22 for operation after passing through parallel transfer box 4 and power switching box 5;

[0053] ② When both motor I2 and motor II3 fail under grid power conditions, motor II3 is disengaged through clutch I10 in power switching box 5, and power input is switched to parallel transfer case 4 through clutch II11 in power switching box 5. Motor I2 is disengaged through gear ring II8 in parallel transfer case 4. The power of diesel engine 1 drives winch drum 7 and turntable 22 for operation after passing through parallel transfer case 4 and power switching box 5.

[0054] Operating conditions:

[0055] When the vehicle-mounted drilling rig is traveling on the highway, the power of the diesel engine 1 drives the front drive axle 13 and the rear drive axle 14 through the parallel transfer case 4; or the electrical energy stored in the large-capacity battery drives the electric motor I2 through the control system, and the power of the electric motor I2 drives the front drive axle 13 and the rear drive axle 14 through the parallel transfer case.

[0056] When the winch drum 7 decelerates, it can be braked by the motor II3 and the energy on the winch drum 7 can be recovered by the power generation function of the motor II3.

Claims

1. A hybrid power transmission system for a vehicle-mounted drilling rig, characterized in that, The system includes a power system comprising a diesel engine (1), an AC variable frequency motor I (2), and a motor II (3); the diesel engine (1) is connected to a gearbox, and the diesel engine (1) drives the motor I (2) to generate electricity through a parallel transfer case (4). The electricity generated by the motor I (2) is stored in a high-power battery, and the power output from the high-power battery drives the motor II (3) after passing through the AC variable frequency control system. The parallel transfer case (4) is connected to a power switching case (5) through a coupling III (17); the motor II (3) is connected to a winch drum (7) through the power switching case (5) and a gear transmission case (6). The power output of the power system is divided into three parts: the first part is used to drive the winch drum (7), the second part is used to drive the turntable (22), and the third part is used to drive the front drive axle (13) and the rear drive axle (14) of the wheels.

2. The vehicle-mounted drilling rig hybrid power transmission system according to claim 1, characterized in that, The electric motor I (2) is connected to the parallel transfer case (4) via coupling IV (18), and the gear sleeve I (8) in the parallel transfer case (4) is used to switch the power output source; the diesel engine (1) is connected to the parallel transfer case (4) via coupling V (19), and the gear sleeve II (9) in the parallel transfer case (4) is used to switch the power source; the gear sleeve I (8) and gear sleeve II (9) can switch the power to be driven by the diesel engine (1) or the electric motor I (2) alone, or by the diesel engine (1) and the electric motor I (2) in parallel.

3. The vehicle-mounted drilling rig hybrid power transmission system according to claim 1, characterized in that, The motor II (3) is connected to the power switching box (5) via coupling II (16). The clutch I (10) connected to the power switching box (5) is used to switch whether the power source is the motor II (3) and the clutch II (11) is used to switch whether the power source is the parallel transfer case (4).

4. The vehicle-mounted drilling rig hybrid power transmission system according to claim 1, characterized in that, The power switching box (5) is connected to the gear transmission box (16) via coupling I (15).

5. The vehicle-mounted drilling rig hybrid power transmission system according to claim 1, characterized in that, The front drive axle (13) is connected to the parallel transfer case via coupling VI (20), and the rear drive axle (14) is connected to the parallel transfer case via coupling VII (21); the gear sleeve Ⅲ (12) in the parallel transfer case (4) is used to switch the power output of the front drive axle (13).

6. A hybrid power transmission method for a vehicle-mounted drilling rig, characterized in that, It adopts two power forms: diesel engine and electric motor I and electric motor II. The diesel engine can be used as the driving force for the winch drum and can also drive electric motor I to generate electricity. The diesel engine and electric motor II can directly drive the winch drum respectively. When the diesel engine is used as the main power to drive the winch drum, electric motor II can be used as an energy-consuming braking device.

7. The hybrid power transmission method for a vehicle-mounted drilling rig according to claim 6, characterized in that, The transmission method is specifically divided into mechanical drive condition, grid power condition, emergency condition, and driving condition: Under grid power conditions: ① The diesel engine (1) is used only for emergency purposes. Under normal working conditions, the grid power is directly driven by the motor II (3) through the AC frequency converter to drive the winch drum (7) and turntable (22) for operation. Under mechanical drive conditions: ① The diesel engine (1) outputs power through the parallel transfer case (4) and then through the power switching case (5) to drive the winch drum (7) and turntable (22) for operation; When the diesel engine (1) is under light load, the excess power is converted into electrical energy by the power generation capacity of the electric motor I (2) and stored in a large-capacity battery; When the diesel engine (1) is under heavy load, the electric motor I (2) is driven by the electrical energy stored in the large-capacity battery to output power and drive the winch drum (7) and turntable (22) in parallel with the power of the diesel engine (1) to carry out the operation. Emergency operating conditions: ① When motor II (3) fails under grid power conditions, motor II (3) is disengaged by clutch I (10) in power switching box (5), and power input is switched to parallel transfer box (4) by clutch II (11) in power switching box (5), and drive motor is switched to motor I (2); grid power directly drives motor I (2) after passing through AC frequency converter controller, and the power of motor I (2) drives winch drum (7) and turntable (22) for operation after passing through parallel transfer box (4) and power switching box (5); ② When both motor I (2) and motor II (3) fail under grid power conditions, motor II (3) is disengaged by clutch I (10) in the power switching box (5), and the power input is switched to the parallel transfer box (4) by clutch II (11) in the power switching box (5). Motor I (2) is disengaged by gear ring II (8) in the parallel transfer box (4). The power of the diesel engine (1) drives the winch drum (7) and turntable (22) for operation after passing through the parallel transfer box (4) and the power switching box (5). Operating conditions: When the vehicle-mounted drilling rig is traveling on the road, the power of the diesel engine (1) drives the front drive axle (13) and the rear drive axle (14) through the parallel transfer case; or the electrical energy stored in the large-capacity battery drives the electric motor I (2) through the control system, and the power of the electric motor I (2) drives the front drive axle (13) and the rear drive axle (14) through the parallel transfer case.

8. The hybrid power transmission method for a vehicle-mounted drilling rig according to claim 7, characterized in that, When the winch drum (7) decelerates, it can be braked by motor II (3) and the energy on the winch drum (7) can be recovered by the power generation function of motor II (3).