Nov Varco TDS11SA TDS8SA Top Drive Main Shaft - Vsp, High Performance

• 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 serves a pivotal role as it seamlessly connects directly to the faucet and drilling motor, channeling power to the drill string and propelling the drilling tool into a smooth rotational motion. This sophisticated operation culminates in the completion of the drilling process with unparalleled efficiency. Unlike the traditional rotary drive techniques, this Main shaft facilitates a continuous and smooth rotation along with casing operations, thereby significantly boosting drilling efficiency.
2. Drill string connection and load support;
The Main shaft forms a robust connection with the integral faucet via a meticulously engineered gearbox housing. It collaborates harmoniously with components such as lifting rings and elevators, effortlessly supporting the entire weight of the drill string and dynamic loads throughout operation. During procedures like connecting the column or flipping the eye, the Main shaft is instrumental in maintaining the drill string's stability and precise alignment.
3. Automated control and parameter monitoring;
In the realm of modern top drive systems, the Main shaft is under constant surveillance with real-time monitoring of its rotation angle, torque, and other critical parameters through advanced sensors. These systems harness the power of AI algorithms to fine-tune drilling controls. A prime example is PetroChina's patented technology, which utilizes a sophisticated distance measuring device to gather Main shaft rotation data, delivering precise feedback that enhances underground operations.
4. Risk Control and Security Assurance;
The Main shaft's design strength and execution efficiency are paramount to ensuring drilling safety. In scenarios where obstacles or mishaps occur, the Main shaft is adept at swiftly adjusting its rotation direction or applying reverse torque, thereby mitigating the risk of drilling tool jamming and ensuring a secure operation.

Material and Manufacturing Standards of Top Drive Main Shaft

1. Material requirements
Hydrogen sulfide resistant alloy steel
Crafted from a specialized alloy steel that boasts resistance to hydrogen sulfide (H2S) corrosion, the Main shaft ensures exceptional durability even within the challenging environments of sulfur-rich oil and gas wells.
The material is required to meet stringent low-temperature toughness standards: when the yield strength is ≥ 310MPa, the impact absorption energy at -20 ºC must be ≥ 32J for a single value, with an average of ≥ 42J. When the yield strength is <310MPa, the single value should be ≥ 20J, and the average value ≥ 27J.
High strength alloy steel
Utilizing conventional carbon steel (such as 50 C12, 50 C4) or alloy steels (nickel chromium, chromium vanadium steel) in non-corrosive environments requires mechanical enhancements through processes like hot rolling and cold drawing to elevate performance.
2. Manufacturing standards
Chinese National Standard (GB/T 31049-2022)
This standard mandates that the top drive Main shaft undergo rigorous static load tensile testing. It requires clarification of parameters for varying drilling depths, such as the Main shaft's inner diameter being ≥ 102mm at a drilling depth of 15000 meters, and a short-term maximum torque of ≥ 150kN · m.
New technical specifications for direct drive top drives have been introduced, which necessitate the removal of mechanical transmission mechanisms when the Main shaft directly interfaces with the motor, thereby boosting transmission efficiency to an impressive 95%.
API Standard (API Spec 8C/8A)
The design of the main load-bearing component demands thorough verification of high and low stress zones via finite element analysis. The safety factor must comply with the PSL1 or PSL2 level requirements.
A load verification test is obligatory (e.g., DQ70 top drive test load must be ≥ 9000kN). Selection and Certification

Adaptation to GB/T 31049 or API standards is essential for both land and ocean drilling and production. Products that have successfully achieved ISO 9001/API dual certification are eligible to enter the global market.
Due to the omission of the gearbox, the direct drive Main shaft necessitates additional verification for the electromechanical integration reliability between the motor and the Main shaft.

Maintenance methods for top drive Main Shaft

1. Daily maintenance
Cleaning and lubrication
Ensure the Main Shaft remains pristine by diligently cleaning away mud and oil residues after each day's tasks. Delicately wipe key components, such as taper joints, with non-woven fabric to shield them from harmful chemical corrosion.
Adhere to manufacturer guidelines by supplementing the Main Shaft bearings with lubricating grease, like lithium-based grease, ensuring the oil injection cycle is capped at 200 hours. Precise control over the oil amount is imperative to prevent contamination.
Fastener Inspection
Consistently verify the pre-tightening force of the Main Shaft's connecting bolts, including lifting ring screws and coupling bolts. Ensure torque adheres to technical manual standards, such as the DQ70BS top drive, which requires bolt torque of no less than 1200N·m.

2, Regular Maintenance
Bearing and Seal Testing
Every 500 hours, disassemble the Main Shaft bearing to check for wear. Measure radial clearance with a micrometer, and replace the bearing if the clearance exceeds 0.05mm.
Quarterly replace seals, like O-rings, prioritizing fluororubber materials to effectively resist hydrogen sulfide corrosion.
Conical Interface Maintenance
Monthly, inspect the wear of the Main Shaft cone mouth. If the tool holder contact rate drops below 75%, perform grinding and repairs to prevent excessive oscillation from the 'horn mouth' effect.

3, Fault Prevention and Handling
Vibration and Temperature Monitoring
Employ vibration sensors for real-time monitoring of abnormal Main Shaft vibrations (threshold ≤ 2.5mm/s). Halt operations if temperature rises exceed 60ºC to diagnose lubrication or bearing concerns.
Emergency Measures
In the event of a sudden drill jam, swiftly activate the IBOP blowout preventer, cut power, and manually turn the disc to release torque, preventing Main Shaft overload and deformation.