The AC variable frequency drive (VFD) top drive system is an advanced drilling drive solution. Centered on a modular integrated structure (as shown in the compact layout with multiple yellow pipes and interfaces in yellow), it aims to comprehensively improve the efficiency, safety, and control precision of oil and gas drilling operations. This system utilizes a high-performance AC motor and a variable frequency drive (VFD), providing precise torque and speed control for rotary drilling under complex geological and working conditions. It is a core power equipment for modern, efficient drilling operations.
Main Functions:
Provides stable rotary motion and controllable torque to the drill string, while achieving stepless speed regulation and precise positioning, effectively improving rock-breaking efficiency and drilling speed. Through the flexible control of the VFD drive, parameters can be adjusted in real time according to formation hardness and drill string assembly, reducing drill string fatigue and equipment mechanical stress, avoiding risks such as stuck drill and drill string blockage, and ensuring the stability of continuous operation.
Variable Frequency Drive (VFD) Control:
Equipped with an advanced VFD drive control system, it can achieve smooth and adjustable linear speed and torque regulation, precisely matching operational needs from low-speed, high-torque directional drilling to high-speed, high-efficiency conventional drilling. Compared to traditional drive methods, VFD technology dynamically optimizes power output, significantly reducing energy consumption and equipment wear. It also supports soft start and emergency stop functions to prevent damage to the drill string and wellbore from impact loads.
High Reliability and Durability:
The system employs robust modular components and high-temperature, corrosion-resistant high-performance AC motors. The overall structure (as shown in the integrated piping and interface design) possesses excellent vibration and shock resistance, adapting to harsh drilling environments such as deserts, oceans, and high-altitude cold regions. Key components undergo redundant design and reinforcement, ensuring stable operation during extended continuous operation, effectively extending equipment lifespan and reducing downtime maintenance costs.
Safety and Operational Efficiency:
Equipped with an advanced real-time monitoring and protection system, it can collect core parameters such as torque, speed, load, and temperature in real time through multiple interface sensors (as shown in the red and white interface modules), enabling data visualization and anomaly warnings. In the event of overload, drill string jamming, or other risks, the system can automatically reduce load or shut down for protection, preventing equipment damage and downhole accidents. It also provides operators with accurate decision-making support, improving operational safety and continuity.
Flexible Integration:
Utilizing a modular integrated design (as shown in the multi-pipeline, multi-interface layout), it is perfectly compatible with various land drilling rigs and offshore drilling platforms, while also supporting seamless integration with existing driller control systems and data acquisition systems. Its flexible installation and expansion capabilities allow it to be adapted for both new drilling equipment and the upgrading of older equipment, meeting the needs of different operating scenarios and well depths.
Standard Compliance:
The entire design, manufacturing, and testing process strictly adheres to API and international drilling equipment standards. Overload testing, environmental simulation testing, and reliability verification ensure stable performance output even under extreme operating conditions. The system’s safety design, electrical protection, and operating procedures all meet global industry requirements, providing users with compliant and reliable operational assurance.
Additional Advantages:
- Precise Directional Control: Supports fine-tuned speed adjustment, adapting to the trajectory control needs of complex well types such as horizontal and directional wells.
- Energy Saving and Consumption Reduction: VFD variable frequency technology dynamically adjusts power according to the load, reducing energy consumption by 15%~25% compared to traditional drive systems.
- Easy maintenance: The modular design allows for quick disassembly and assembly of core components, and the standardized layout of pipelines and interfaces facilitates daily inspections and replacement of vulnerable parts.
Product types and specifications：
Technical parameter of series I Top Drive system
| Top drive model | DQ40/2250DB | DQ50/3150DB | DQ70/4500DB | HDQ70/4500DB | DQ90/6750DB |
| Nominal drilling depth (114mm drill pipe) , m | 2500～4000 | 3500～5000 | 4500～7000 | 4500～7000 | 6000～9000 |
| Rated load ，kN (tons) | 2250（250） | 3150（350） | 4500（500） | 4500（500） | 6750（750） |
| Max. continous drilling torqueN·m (lb-ft) | 31400（23160） | 46700（34444） | 52600（38796） | 58000（42779） | 80000（59005） |
| Max. Breakout torque N·m (lb-ft) | 53000（39090） | 70000（51630） | 78900（58194） | 87000（64168） | 140000（103259） |
| Brake torque N·m (lb-ft) | 35000（25815） | 53000（39090） | 53000（39090） | 80000（59005） | 100000（73756） |
| Main shaft speed range, r/min | 0～191 | 0～227 | 0～227 | 0～227 | 0～241 |
| Thread type of saver sub and drill pipe | NC50﹡ | NC50﹡ | NC50﹡ | NC50﹡ | NC50﹡ |
| Range of Backup tong as handling drill pipe, mm (in) | Φ79.4～Φ203.2（2 7/8～6 5/8） | Φ79.4～Φ203.2（2 7/8～6 5/8） | Φ79.4～Φ203.2（2 7/8～6 5/8） | Φ79.4～Φ203.2（2 7/8～6 5/8） | Φ73～Φ203.2（2 7/8～6 5/8） |
| Max. bore diameter of backup tong ,mm | Φ216 | Φ216 | Φ216 | Φ216 | Φ260 |
| Mud passage, pressure mm，MPa | Φ76，35 | Φ76，35 | Φ76，35 | Φ76，35 | Φ102，52.5 |
| Top drive model | DQ40/2250DB | DQ50/3150DB | DQ70/4500DB | HDQ70/4500DB | DQ90/6750DB |
| Main motor rated power ,kW | 1×315 | 2×280 | 2×315 | 2×350 | 2×450 |
| Top drive working height(with hook ),m | 4.85 | 5.5 | 5.52 | 5.52 | 6.45 |
| Top drive working height(with traveling block ),m | 5.36 | 5.965 | 5.985 | 5.985 | 6.91 |
Technical parameter of series II Drive system
| Model | DQ120BSC | DQ90BSD | DQ90BSC | DQ70BSD | DQ70BSC | DQ70BSE | DQ50BC | DQ40BCQ |
| Nominal Drilling Depth114m( 4 1/2″)drill pipe | 12,000m39，370ft | 9,000m29，528ft | 7,000 m22，966 ft | 5,000 m16,404 ft | 4,000 m13,123 ft | |||
| Rated Load(API 8A／8C PSL 1) | 9,000kN1,000 ton(US) | 6,750kN750ton(US) | 4,500 kN500 ton(US) | 3,150 kN350 ton(US) | 2,250 kN250ton(US) | |||
| Power Supply | 600VAC∕50Hz(optional 60Hz) | |||||||
| Main Motor Rated Power(continuous) | 440kW×2600HP×2 | 440kW×2600HP×2 | 368 kW×2500HP×2 | 368 kW×2500HP×2 | 295 kW×2400 HP×2 | 368 kW500 HP | 295 kW400 HP | |
| Rotary Speed | 0-200r∕min | 0-220r∕min | 0-180 r∕min | 0-200 r∕min | ||||
| Drilling Torque (continuous) | 62,700lbf·ft | 62,700lbf·ft | 51,600 lbf·ft | 44,300lbf·ft | 50 kN·m36,900 lbf·ft | 40 kN·m29,500 lbf·ft | 30 kN·m22,000 lbf·ft | |
| Maximum Torque of Break-Out | 135kN·m99,600lbf·ft | 135kN·m99,600lbf·ft | 110kN·m81，800lbf·ft | 90 kN·m66,400lbf·ft | 75 kN·m55,300 lbf·ft | 60 kN·m44,300 lbf·ft | 45 kN·m33,200 lbf·ft | |
| Backup Tong Range（drill pipe） | 2 7/8～6 5/8 in | 2 7/8～6 5/8 in | 2 7/8～6 5/8 in | 2 7/8～6 5/8 in | 2 7/8～6 5/8 in | 2 7/8～6 5/8 in | 2 7/8～6 5/8 in | |
| Hydraulic System Working Pressure | 16MPa 2,280psi | |||||||
| Mud Circulating Diameter | 4 in | 3 1/2 in | 3 1/2 in | 3 in | 3 in | 3 in | 3 in | 3 in |
| Rated Circulating Pressure | 7,540psi | 5000psi | 5000psi | 5000psi | 5000psi | |||
| Top Drive Working Height | 22.6ft | 22ft | 21.3 ft | 21 ft | 20 ft | 20 ft | 19.4 ft | 17.4 ft |
| Top Drive Width | 2,096mm6.88ft | 2,096mm6.88ft | 1,778 mm5.83 ft | 1,778 mm5.83 ft | 1,663 mm5.46 ft | 1,594 mm5.23 ft | 1,537 mm5.04 ft | 1,196 mm3.92 ft |
| Distance of Guide Rail to the Center of Well | 3.58ft | 3.58f | 3.15 ft | 3.05 ft | 3.05 ft | 3.05 ft | Vertical:2.30 ftHorizontal:1.53 ft | Vertical:1.72 ftHorizontal:1.14 ft |
