Vsp Nov Varco TDS11SA TDS8SA Top Drive Main Shaft

• 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 ingeniously connected to the faucet and drilling motor, seamlessly transmitting power to the drill string. This connection drives the drilling tool to rotate, facilitating efficient drilling operations. Unlike traditional rotary drive methods, our Main Shaft offers continuous rotation and casing operation, significantly enhancing drilling efficiency.
2. Drill String Connection and Load Support;
The Main Shaft is securely linked to the integral faucet via a robust gearbox housing. It collaborates with essential components such as lifting rings and elevators to bear the entire weight of the drill string and dynamic loads during operation. This ensures unparalleled stability and precise alignment of the drill string when connecting columns or flipping the eye.
3. Automated Control and Parameter Monitoring;
Cutting-edge top drive systems now offer real-time monitoring of rotation angle, torque, and other critical parameters of the Main Shaft through advanced sensors. AI algorithms optimize drilling control, exemplified by PetroChina's patented technology. This utilizes a distance measuring device to collect Main Shaft rotation data, delivering precise feedback essential for underground operations.
4. Risk Control and Security Assurance;
The design strength and execution efficiency of the Main Shaft are pivotal to ensuring drilling safety. In the event of an obstruction or stuck incident, the Main Shaft swiftly adjusts its rotation direction or applies reverse torque, effectively mitigating the risk of drilling tool jamming.

Material and Manufacturing Standards of Top Drive Main Shaft

1. Material Requirements
Hydrogen Sulfide Resistant Alloy Steel
The Main Shaft must be crafted from special alloy steel, resilient against hydrogen sulfide (H2S) corrosion, ensuring longevity in sulfur-rich oil and gas well environments.
The material must fulfill low-temperature toughness criteria: with yield strength ≥ 310MPa, the single value of impact absorption energy at -20 ºC is ≥ 32J, and the average is ≥ 42J; if yield strength is <310MPa, the single value should be ≥ 20J, and the average ≥ 27J.
High Strength Alloy Steel
Conventional carbon steel (such as 50 C12, 50 C4) or alloy steel (nickel-chromium, chromium-vanadium steel) in non-corrosive environments require mechanical performance enhancement through hot rolling and cold drawing processes.
2. Manufacturing Standards
Chinese National Standard (GB/T 31049-2022)
Standards dictate that the Top Drive Main Shaft must undergo static load tensile testing, with parameters clarified for different drilling depths (e.g., Main Shaft inner diameter ≥ 102mm at a drilling depth of 15,000 meters, short-term maximum torque ≥ 150kN·m).
New technical specifications for direct drive top drives have been introduced, requiring the removal of mechanical transmission mechanisms when the Main Shaft connects directly to the motor, boosting transmission efficiency to 95%.
API Standard (API Spec 8C/8A)
Designs for the main load-bearing component must verify high and low stress zones through finite element analysis, meeting safety factor requirements of PSL1 or PSL2 level.
Load verification tests are mandatory (e.g., DQ70 top drive test load ≥ 9,000kN). Selection and Certification

Both land and ocean drilling and production must adhere to GB/T 31049 or API standards, respectively. Products with ISO 9001/API dual certification gain access to the international market.
The direct drive Main Shaft requires additional verification of electromechanical integration reliability between the motor and Main Shaft, due to the absence of a gearbox.

Maintenance Methods for Top Drive Main Shaft

1. Daily Maintenance
Cleaning and Lubrication
Ensure the pristine condition of the Main Shaft by meticulously cleaning away any mud and oil residues after each day's operations. Use a non-woven fabric to gently cleanse key areas, like the taper joints, to defend against the harsh effects of chemical corrosion.
Meticulously adhere to the manufacturer's specifications by supplementing the lubricating grease, such as lithium-based grease. The oil injection cycle for the main shaft bearings should be strictly observed, ensuring it does not surpass 200 hours. Precisely measure the oil quantity to prevent any contamination, guaranteeing smooth and efficient operation.
Fastener inspection
Engage in regular assessments of the pre-tightening force of the main shaft's connecting bolts, including lifting ring screws and coupling bolts. Ensure the torque aligns with the technical manual standards, such as the DQ70BS top drive, where bolt torque must be ≥ 1200N · m.

2, Regular maintenance
Bearing and seal testing
Every 500 hours, undertake a thorough disassembly and inspection of the Main Shaft bearing for wear and tear. Use a micrometer to gauge radial clearance, replacing it if it exceeds 0.05mm, ensuring optimal performance and longevity.
Replace seals, such as O-rings, every quarter, prioritizing the use of fluororubber materials to combat the corrosive nature of hydrogen sulfide, thus maintaining integrity and performance.
Conical interface maintenance
Conduct a monthly inspection of the Main Shaft's cone mouth wear. If the contact rate of the tool holder falls below 75%, prompt grinding and repairs are essential to prevent excessive vibration caused by the 'horn mouth' effect.

3, Fault prevention and handling
Vibration and temperature monitoring
Equip with vibration sensors to monitor Main Shaft vibrations in real-time, ensuring they remain below the threshold of 2.5mm/s. If temperatures escalate beyond 60 ºC, swiftly halt operations to investigate lubrication or bearing issues, thus safeguarding the machinery.
Emergency measures
In the event of a sudden drill jam, immediately engage the IBOP blowout preventer, disconnect power, and manually rotate the disc to release torque, preventing Main Shaft overload and deformation.