Vsp Nov Varco TDS11SA TDS8SA Top Drive Main Shaft From China

• 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 directly connected to the faucet and drilling motor, transmitting power to the drill string, driving the drilling tool to rotate and complete the drilling operation. Compared to traditional rotary drive methods, the Main shaft can achieve continuous rotation and casing operation, improving drilling efficiency.
2.Drill string connection and load support;
The main shaft is connected to the integral faucet through a gearbox housing and cooperates with components such as lifting rings and elevators to bear the entire weight of the drill string and dynamic loads during operation. When connecting the column or flipping the eye, the Main shaft ensures the stability and precise alignment of the drill string.
3.Automated control and parameter monitoring;
Modern top drive systems monitor the rotation angle, torque, and other parameters of the main shaft in real-time through sensors, and optimize drilling control using AI algorithms. For example, PetroChina's patented technology utilizes a distance measuring device to collect Main shaft rotation data, providing precise feedback for underground operations.
4.Risk Control and Security Assurance;
The design strength and execution efficiency of the Main shaft directly affect drilling safety. In the event of a stuck or obstructed accident, the Main shaft can quickly adjust its rotation direction or apply reverse torque to reduce 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 needs to be made of special alloy steel that is resistant to hydrogen sulfide (H2S) corrosion to ensure durability in sulfur-containing oil and gas well environments.
The material must meet the low-temperature toughness requirements: when the yield strength is ≥ 310MPa, the single value of impact absorption energy at -20 ºC is ≥ 32J, and the average value is ≥ 42J; when the yield strength is<310MPa, the single value is ≥ 20J, and the average value is ≥ 27J.
High strength alloy steel
Conventional carbon steel (such as 50 C12, 50 C4) or alloy steel (nickel chromium, chromium vanadium steel) used in non corrosive environments require mechanical performance improvement through processes such as hot rolling and cold drawing.
2, Manufacturing standards
Chinese National Standard (GB/T 31049-2022)
It is stipulated that the top drive Main shaft needs to undergo static load tensile testing, and the parameters corresponding to different drilling depths should be clarified (such as Main shaft inner diameter ≥ 102mm at a drilling depth of 15000 meters, and short-term maximum torque ≥ 150kN · m).
New technical specifications for direct drive top drive have been added, requiring the removal of mechanical transmission mechanisms when the Main shaft is directly connected to the motor, in order to improve transmission efficiency to 95%.
API Standard (API Spec 8C/8A)
The design of the main load-bearing component needs to verify the high and low stress zones through finite element analysis, and the safety factor needs to meet the requirements of PSL1 or PSL2 level.
Load verification test is required (e.g. DQ70 top drive test load ≥ 9000kN). Selection and Certification

Land and ocean drilling and production need to be adapted to GB/T 31049 or API standards respectively. Products that have passed ISO 9001/API dual certification can enter the international market.
The direct drive Main shaft requires additional verification of the electromechanical integration reliability between the motor and the Main shaft due to the cancellation of the gearbox.

Maintenance methods for top drive Main shaft

1, Daily maintenance
Cleaning and lubrication
Ensure pristine cleanliness and optimal lubrication for the VSP Nov Varco TDS11SA TDS8SA Top Drive Main Shaft. After each day's operations, meticulously remove mud and oil from the shaft's surface. Use non-woven fabric to delicately wipe essential areas like taper joints, safeguarding them from potential chemical degradation.
Adhere to the manufacturer's guidelines for the timely supplementation of lubricating grease, such as high-quality lithium-based grease. The main shaft bearings demand precise oil injection, which should occur no less frequently than every 200 hours. This precision prevents contamination and ensures seamless operation.
Fastener inspection
Conduct regular inspections to ensure the pre-tightening force of the main shaft's connecting bolts meets stringent standards. Focus on bolts like lifting ring screws and coupling bolts, ensuring the torque aligns with the technical manual, for instance, the DQ70BS top drive mandates a torque of no less than 1200N·m.

2, Regular maintenance
Bearing and seal testing
Every 500 hours, disassemble and scrutinize the main shaft bearing for wear. Use a micrometer to measure the radial clearance, and if it surpasses 0.05mm, a replacement is essential to maintain efficiency and safety.
Quarterly, prioritize the replacement of seals, such as O-rings. Opt for fluororubber materials to effectively withstand hydrogen sulfide corrosion, ensuring long-lasting durability.
Conical interface maintenance
Monthly, assess the wear on the main shaft's cone mouth. Should the tool holder's contact rate fall below 75%, immediate grinding and repair are necessary to prevent excessive vibration due to the 'horn mouth' effect.