Dq30 Dq40 Top Drive Main Shaft for Nov Varco TDS11SA TDS8SA Models

• 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. Unleashing the Power of Transmission and Rotational Drive;
The Main Shaft serves as the vital link connecting the faucet and drilling motor, channeling immense power to the drill string. This drives the drilling tool into seamless motion, executing the drilling operation with unprecedented efficiency. Unlike traditional methods, this Main Shaft facilitates continuous rotation and casing operations, significantly elevating drilling performance.
2. Ensuring Robust Drill String Connection and Load Support;
Linked to the integral faucet via a sophisticated gearbox housing, the Main Shaft collaborates with lifting rings and elevators to support the drill string's weight and dynamic loads. During column connections or eye flips, it guarantees the drill string's stability and precise alignment, ensuring a flawless operation.
3. State-of-the-art Automated Control and Parameter Monitoring;
The cutting-edge top drive systems leverage sensors to monitor the Main Shaft's rotation angle, torque, and additional parameters in real-time. AI algorithms optimize drilling control, while innovations like PetroChina's patented distance measuring devices provide precise feedback, enhancing underground operational accuracy.
4. Proactive Risk Control and Security Assurance;
The Main Shaft's design strength and execution efficiency are crucial for drilling safety. If obstructions occur, it swiftly adjusts rotation or applies reverse torque to minimize jamming risks, ensuring uninterrupted and secure drilling operations.

Material and Manufacturing Standards of Top Drive Main Shaft

1. Rigorous Material Requirements
Hydrogen Sulfide Resistant Alloy Steel
Crafted from specialized alloy steel, the Main Shaft boasts resistance to hydrogen sulfide (H2S) corrosion, ensuring longevity and reliability even in sulfur-rich oil and gas well environments.
The material must defy low-temperature challenges: with a yield strength ≥ 310MPa, impact absorption energy at -20 ºC must be ≥ 32J (single value) and ≥ 42J (average). For yield strength <310MPa, the values should be ≥ 20J and ≥ 27J, respectively.
High-Strength Alloy Steel
In non-corrosive settings, conventional carbon or alloy steels (such as 50 C12, 50 C4, nickel chromium, or chromium vanadium steel) undergo enhancements like hot rolling and cold drawing to boost mechanical performance.
2. Stringent Manufacturing Standards
Chinese National Standard (GB/T 31049-2022)
This mandates static load tensile testing for the top drive Main Shaft, with parameters defined for various drilling depths (e.g., a Main Shaft inner diameter ≥ 102mm at 15000 meters depth, short-term maximum torque ≥ 150kN · m).
New specifications for direct drive top drives require eliminating mechanical transmission mechanisms when the Main Shaft connects directly to the motor, thus boosting transmission efficiency to 95%.
API Standard (API Spec 8C/8A)
The design undergoes finite element analysis to verify stress zones, ensuring the safety factor aligns with PSL1 or PSL2 standards.
A rigorous load verification test is obligatory (e.g., DQ70 top drive test load ≥ 9000kN).

Land and ocean drilling and production must adhere to GB/T 31049 or API standards, respectively. Products certified with ISO 9001/API dual certification are eligible for international markets.
The direct drive Main Shaft demands additional validation of electromechanical integration reliability between motor and Main Shaft due to the gearbox elimination.

Maintenance Methods for Top Drive Main Shaft

1, Daily Maintenance: A Commitment to Excellence
Pristine Cleaning and Precision Lubrication
Ensure the VSP Top Drive Main Shaft remains in optimal condition by meticulously cleaning any mud and oil stains after daily operations. Employ non-woven fabric to gently wipe key areas, like taper joints, protecting them from harmful chemical corrosion.
Adhere to the manufacturer's guidelines for supplementing lubricating grease, such as lithium-based grease. Maintain an oil injection cycle for the main shaft bearings that does not exceed 200 hours, and control the oil injection amount with precision to prevent contamination and ensure peak performance.
Meticulous Fastener Inspection
Conduct regular checks on the pre-tightening force of the main shaft connecting bolts, including lifting ring screws and coupling bolts. Ensure that the torque aligns with technical manual standards, such as the DQ70BS top drive requiring bolt torque of at least 1200N·m.

2, Regular Maintenance: A Proactive Approach
Comprehensive Bearing and Seal Testing
Every 500 hours, disassemble and scrutinize the wear of the Main shaft bearing. Use a micrometer to measure radial clearance, and replace the bearing if clearance exceeds 0.05mm to maintain smooth operations.
Replace seals, such as O-rings, quarterly, prioritizing fluororubber materials to effectively resist hydrogen sulfide corrosion and ensure lasting durability.
Conical Interface Maintenance: Precision and Care
Monthly, assess the wear on the Main shaft cone mouth. If the tool holder's contact rate falls below 75%, perform grinding and repairs to prevent excessive jumping, often caused by a "horn mouth."

3, Fault Prevention and Handling: Vigilance and Response
Real-time Vibration and Temperature Monitoring
Deploy vibration sensors to monitor any abnormal Main shaft vibrations in real-time, with thresholds set to ≤ 2.5mm/s. If the temperature rise surpasses 60 ºC, halt operations immediately to investigate and resolve lubrication or bearing issues.
Swift and Decisive Emergency Measures
In the event of a sudden drill jam, activate the IBOP blowout preventer without delay. Cut off the power supply and manually turn the disc to release torque, preventing Main shaft overload and deformation.