Nov Varco TDS11SA TDS8SA Top Drive Main Shaft Dq50

• Customization: Available
• After-sales Service: 2 Year
• Warranty: 2 Year
• Model NO.: VSP
• Manufacturing Process: Stamping
• Surface Treatment: Galvanized
• Operation Pressure: Vacuum
• Material: Cast Steel
• Transport Package: Wooden Box
• Specification: 10*10*10
• Trademark: VSP
• Origin: China
• HS Code: 8431431000
• Production Capacity: 2000pieces / Year
• Package Size: 10.00cm * 10.00cm * 10.00cm
• Package Gross Weight: 32.000kg

Product Description

Detail Function:

1. Power Transmission and Rotational Drive:
The Main Shaft is a crucial component directly linking the faucet and drilling motor, tasked with transmitting immense power to the drill string. This dynamic force propels the drilling tool, enabling seamless rotation to accomplish the drilling operation. Unlike traditional rotary drive methods, our Main Shaft technology ensures continuous rotation and efficient casing operations, markedly enhancing drilling effectiveness.
2. Drill String Connection and Load Support:
Through a sophisticated gearbox housing, the Main Shaft connects to the integral faucet, working in harmony with components such as lifting rings and elevators. This synergy supports the entire weight of the drill string and manages dynamic loads during operation. Whether connecting the column or flipping the eye, the Main Shaft guarantees unwavering stability and precision alignment of the drill string.
3. Automated Control and Parameter Monitoring:
Our modern top drive systems leverage cutting-edge sensors to track the rotation angle, torque, and other critical parameters of the Main Shaft in real-time. Advanced AI algorithms then optimize drilling control, ensuring peak performance. For instance, PetroChina's proprietary technology employs a distance measuring device to gather Main Shaft rotation data, delivering precise feedback for subterranean operations.
4. Risk Control and Security Assurance:
The robust design and operational efficiency of the Main Shaft are pivotal to drilling safety. In scenarios involving obstruction or equipment jamming, the Main Shaft can swiftly alter its rotation direction or apply reverse torque, significantly mitigating the risk of drilling tool entrapment.

Material and Manufacturing Standards of Top Drive Main Shaft:

1. Material Requirements:
Hydrogen Sulfide Resistant Alloy Steel:
Our Main Shaft is crafted from specialized alloy steel, offering exceptional resistance to hydrogen sulfide (H2S) corrosion. This ensures its longevity and reliability in sulfur-laden oil and gas well environments.
The material adheres to rigorous low-temperature toughness standards: when yield strength is ≥ 310MPa, the impact absorption energy at -20 ºC must be a minimum of 32J, with an average of 42J. For yield strength < 310MPa, the single value must be ≥ 20J and the average ≥ 27J.
High Strength Alloy Steel:
In non-corrosive settings, conventional carbon steel (50 C12, 50 C4) or alloy steel like nickel chromium and chromium vanadium require mechanical enhancements through methods like hot rolling and cold drawing to elevate performance.
2. Manufacturing Standards:
Chinese National Standard (GB/T 31049-2022):
This standard mandates static load tensile testing for the top drive Main Shaft, with parameters tailored to various drilling depths (e.g., inner diameter ≥ 102mm at 15000 meters, max torque ≥ 150kN·m).
New direct drive top drive specifications demand the elimination of mechanical transmission mechanisms when the Main Shaft connects directly to the motor, enhancing transmission efficiency to an impressive 95%.
API Standard (API Spec 8C/8A):
The design of main load-bearing components must undergo finite element analysis to verify high and low stress zones, ensuring safety factors meet PSL1 or PSL2 levels.
Load verification tests are crucial (such as DQ70 top drive test load ≥ 9000kN). Selection and Certification:

Land and ocean drilling operations should conform to GB/T 31049 or API standards respectively. Products boasting ISO 9001/API dual certification are eligible for international markets.
The direct drive Main Shaft necessitates further verification of electromechanical integration reliability between the motor and Main Shaft, following the removal of the gearbox.

Maintenance Methods for Top Drive Main Shaft:

1. Daily Maintenance
Cleaning and Lubrication
After each day's operations, meticulously clean the Main Shaft, removing all mud and oil stains. Utilize non-woven fabric to gently wipe key areas, such as taper joints, ensuring they remain free from corrosive chemicals.
Top up with lubricating grease, such as lithium-based grease, as specified by the manufacturer. Ensure the lubrication cycle for the main shaft bearings does not exceed 200 hours. Precisely manage the amount of grease to prevent any contamination, safeguarding optimal performance.
Fastener Inspection
Conduct thorough checks on the pre-tightening force of all main shaft connecting bolts, including lifting ring screws and coupling bolts. Ensure the torque aligns with the technical manual standards, such as requiring ≥ 1200N · m for DQ70BS top drives.

2. Regular Maintenance
Bearing and Seal Testing
Every 500 hours, disassemble and meticulously examine the Main Shaft bearing for wear. Use a micrometer to measure the radial clearance, replacing the bearing if it exceeds 0.05mm, to maintain peak performance.
Replace seals like O-rings quarterly. Choose fluororubber materials to effectively resist hydrogen sulfide corrosion, ensuring long-lasting durability.
Conical Interface Maintenance
Each month, inspect the Main Shaft cone mouth for wear. If the tool holder's contact rate falls below 75%, grind and repair to prevent excessive jumping caused by the 'horn mouth', ensuring smooth operations.

3. Fault Prevention and Handling
Vibration and Temperature Monitoring
Real-time monitor the Main Shaft for abnormal vibrations using sensors (threshold ≤ 2.5mm/s). Should the temperature exceed a 60 ºC rise, immediately halt operations to investigate lubrication or bearing issues.