Nov Varco TDS11SA TDS8SA Top Drive Main Shaft, Vsp, China Origin

• 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 pivotal element, intricately linked to the faucet and drilling motor. It channels power to the drill string, facilitating the continuous rotation of the drilling tool for seamless drilling operations. Unlike conventional rotary drive methods, the Main shaft enables uninterrupted rotation and casing operations, significantly boosting drilling efficiency.
2. Drill string connection and load support;
The Main shaft is expertly connected to the integral faucet via a gearbox housing, working harmoniously with components like lifting rings and elevators. This setup supports 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 drill string maintains optimal stability and precise alignment.
3. Automated control and parameter monitoring;
State-of-the-art top drive systems employ real-time monitoring of the main shaft's rotation angle, torque, and other vital parameters using advanced sensors. AI algorithms enhance drilling control, as exemplified by PetroChina's innovative technology, which uses a distance measuring device to collect Main shaft rotation data, delivering precise feedback for underground operations.
4. Risk Control and Security Assurance;
The Main shaft's design strength and execution efficiency are crucial for drilling safety. In scenarios of obstruction or jamming, the Main shaft can swiftly adjust its rotation direction or apply reverse torque, minimizing the risk of drilling tool jams.

Material and Manufacturing Standards of Top Drive Main Shaft

1. Material requirements
Hydrogen sulfide resistant alloy steel
To ensure longevity in sulfur-rich oil and gas well environments, the Main shaft must be crafted from an alloy steel that resists hydrogen sulfide (H2S) corrosion.
The material must satisfy low-temperature toughness: with a yield strength of ≥ 310MPa, the impact absorption energy at -20 ºC must be ≥ 32J for a single value and ≥ 42J on average; with yield strength <310MPa, the single value should be ≥ 20J, with an average of ≥ 27J.
High strength alloy steel
In non-corrosive settings, conventional carbon steel (such as 50 C12, 50 C4) or alloy steel (nickel chromium, chromium vanadium steel) require mechanical enhancement through hot rolling and cold drawing processes.
2. Manufacturing standards
Chinese National Standard (GB/T 31049-2022)
Mandates that the top drive Main shaft undergo rigorous static load tensile tests, with parameters tailored to various drilling depths (e.g., Main shaft inner diameter ≥ 102mm at a drilling depth of 15000 meters, and short-term maximum torque ≥ 150kN · m).
New directives for direct drive top drives require eliminating mechanical transmission mechanisms when the Main shaft connects directly to the motor, aiming to elevate transmission efficiency to 95%.
API Standard (API Spec 8C/8A)
Designs for the main load-bearing components necessitate verification through finite element analysis to identify high and low stress zones, ensuring the safety factor aligns with PSL1 or PSL2 standards.
A comprehensive load verification test is essential (e.g., DQ70 top drive test load ≥ 9000kN). Selection and Certification

Land and marine drilling and production must comply with GB/T 31049 or API standards respectively. Products achieving ISO 9001/API dual certification are eligible for the international market.
Due to the removal of the gearbox, the direct drive Main shaft requires further validation of the electromechanical integration reliability between the motor and the Main shaft.

Maintenance methods for top drive Main Shaft

1, Daily maintenance
Cleaning and lubrication
After each day's work, meticulously cleanse the Main Shaft's surface, banishing mud and oil stains. Use non-woven fabric to delicately wipe key components, like taper joints, to shield them from the ravages of chemical corrosion.
Adhere to the manufacturer's specifications by supplementing with lubricating grease, such as lithium-based grease. Ensure the main shaft bearings are oiled within a 200-hour cycle, with precision in the amount to prevent any contamination, thus guaranteeing smooth operation.
Fastener inspection
Conduct regular inspections of the pre-tightening force on the main shaft's connecting bolts, such as lifting ring screws and coupling bolts. Adhere to technical manual standards, ensuring torque meets or exceeds values like 1200N · m for the DQ70BS top drive.

2, Regular maintenance
Bearing and seal testing
Every 500 hours, disassemble and scrutinize the Main shaft bearing for wear. Use a micrometer to measure radial clearance, replacing it if it surpasses 0.05mm, thus maintaining optimal performance.
Replace seals, such as O-rings, on a quarterly basis, prioritizing fluororubber materials to combat hydrogen sulfide corrosion, ensuring enduring protection.
Conical interface maintenance
Monthly, inspect the wear on the Main shaft's conical interface. If the tool holder's contact rate dips below 75%, immediate grinding and repair are necessary to prevent excess vibration from the 'horn mouth'.

3, Fault prevention and handling
Vibration and temperature monitoring
Equip with vibration sensors for real-time monitoring of any abnormal Main shaft vibrations, ensuring they remain below 2.5mm/s. If temperature rises beyond 60 ºC, cease operation to investigate lubrication or bearing issues.
Emergency measures
In the event of a sudden drill blockage, instantly activate the IBOP blowout preventer, cut power, and manually rotate the disc to release torque. This prevents overloading and potential deformation of the Main shaft.