Nov Varco TDS11SA TDS8SA Top Drive Main Shaft -API Specification

• 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, an engineering marvel, seamlessly connects to the faucet and drilling motor, channeling power to the drill string. This robust component orchestrates the rotation of the drilling tool, ensuring the flawless execution of drilling operations. Unlike conventional rotary drive systems, this Main Shaft facilitates uninterrupted rotation and casing operations, significantly amplifying drilling efficiency.
2. Drill string connection and load support;
Ingeniously designed, the Main Shaft links to the integral faucet via a gearbox housing, working in harmony with lifting rings and elevators. This system masterfully supports the entire weight of the drill string and handles dynamic operational loads. During column connections or eye rotations, the Main Shaft guarantees the drill string's stability and precise alignment, showcasing engineering precision.
3. Automated control and parameter monitoring;
In the realm of modern top drive systems, the Main Shaft emerges as a masterpiece of innovation. It features real-time monitoring of rotation angles, torque, and other critical parameters through advanced sensors. AI algorithms refine drilling control, a testament to technological prowess. For instance, PetroChina's patented tech employs a distance measuring device to gather Main Shaft rotation data, offering precise feedback for underground operations.
4. Risk Control and Security Assurance;
The Main Shaft's formidable design strength and execution efficiency are pivotal to drilling safety. In scenarios of tool jam or obstruction, the Main Shaft swiftly adapts its rotation direction or applies reverse torque, mitigating the risk of drilling tool entrapment and ensuring operational security.

Material and Manufacturing Standards of Top Drive Main Shaft

1. Material requirements
Hydrogen sulfide resistant alloy steel
Crafted from specialized alloy steel, the Main Shaft resists hydrogen sulfide (H2S) corrosion, a testament to its durability in sulfur-rich oil and gas environments. This ensures long-lasting performance, even in the harshest conditions.
The material is engineered to meet exacting low-temperature toughness standards: with yield strength ≥ 310MPa, it boasts an impact energy of ≥ 32J at -20°C, averaging ≥ 42J; if yield strength is < 310MPa, it achieves ≥ 20J, with an average of ≥ 27J.
High strength alloy steel
Within non-corrosive environments, traditional carbon steel (e.g., 50 C12, 50 C4) or alloy steel (nickel chromium, chromium vanadium) undergo enhancements like hot rolling and cold drawing to elevate mechanical performance.
2. Manufacturing standards
Chinese National Standard (GB/T 31049-2022)
This standard mandates static load tensile testing of the top drive Main Shaft, specifying parameters for varying drilling depths (e.g., Main Shaft inner diameter ≥ 102mm at 15,000 meters depth, short-term maximum torque ≥ 150kN·m).
Innovative specifications for direct drive top drives require the elimination of mechanical transmission mechanisms when the Main Shaft connects directly to the motor, boosting transmission efficiency to an impressive 95%.
API Standard (API Spec 8C/8A)
Designs for primary load-bearing components undergo rigorous finite element analysis to identify high and low stress zones. Safety factors must align with PSL1 or PSL2 standards, ensuring operational integrity.
Load verification tests are compulsory (e.g., DQ70 top drive test load ≥ 9000kN).

Land and ocean drilling operations must align with GB/T 31049 or API standards. Products that achieve ISO 9001/API dual certification are primed for international market entry.
The direct drive Main Shaft demands additional validation for electromechanical integration reliability between the motor and the Main Shaft, a necessity given the gearbox's removal.

Comprehensive Maintenance Strategies for the Top Drive Main Shaft

1. Daily Maintenance Protocols
Cleaning and Lubrication Routine
After each day's operations, meticulously clean the surface of the Main shaft to remove mud and oil stains. Use a non-woven fabric to gently wipe critical areas, such as taper joints, to prevent chemical corrosion and ensure long-lasting durability.
Replenish lubricating grease, opting for high-quality lithium-based grease as per the manufacturer's guidelines. The oil injection cycle for the main shaft bearings must not exceed 200 hours, and the precise amount should be controlled to prevent any contamination.
Inspection of Fasteners
Conduct regular inspections of the pre-tightening force of the main shaft connecting bolts, including lifting ring screws and coupling bolts. Torque specifications should strictly adhere to the technical manual standards, such as the DQ70BS top drive, which requires bolt torque to be ≥ 1200N · m.

2. Scheduled Maintenance Procedures
Examination of Bearings and Seals
Every 500 hours, disassemble and assess the wear on the Main shaft bearing. Measure the radial clearance using a micrometer, and replace the bearing if the clearance exceeds 0.05mm to ensure optimal performance.
Seals, including O-rings, should be replaced every quarter, prioritizing fluororubber materials to effectively resist hydrogen sulfide corrosion.
Maintenance of Conical Interfaces
Monthly inspections of the Main shaft cone mouth are essential. If the tool holder's contact rate drops below 75%, grinding and repair are necessary to prevent excessive jumping caused by the 'horn mouth' effect.

3. Fault Prevention and Management
Monitoring Vibration and Temperature
Install advanced vibration sensors to continuously monitor abnormal Main shaft vibrations in real-time, maintaining a threshold of ≤ 2.5mm/s. If the temperature rises beyond 60 ºC, halt operations immediately to investigate lubrication or bearing issues.
Implementing Emergency Protocols
In the event of a sudden drill obstruction, swiftly activate the IBOP blowout preventer, disconnect the power, and manually turn the disc to release torque, thereby preventing overload and deformation of the Main shaft.