The YH-2500D is a heavy-duty fully hydraulic surface coring rig owned and operated by 3JTech. Designed for deep geothermal exploration, mineral prospecting, geotechnical investigations, and scientific drilling, the rig combines high torque, powerful hoisting capacity, and long-stroke feed capability for efficient deep core drilling operations.

The rig is equipped with the CHD98 wireline coring system, allowing core recovery without tripping the drill string. This significantly improves drilling efficiency, increases core recovery quality, and reduces non-productive time (NPT), making it particularly suitable for deep geothermal and exploration drilling projects.

Key Technical Specifications

• Drilling Capacity
  • N-size: 3,600 m
  • H-size: 2,500 m
  • P-size: 1,800 m
• Power Head System
  • Maximum Torque: 9,400 N·m
  • Three-Speed Gearbox:
    • 10–340 rpm
    • 15–560 rpm
    • 20–840 rpm
• Feed System
  • Feed Stroke: 4,800 mm
  • Maximum Feed Force: 100 kN
  • Maximum Pull Capacity: 360 kN
• Mast System
  • Mast Height: 12.96 m
  • Rated Hook Load: 75 tonnes
  • Maximum Pipe Handling Length: 9 m
  • Drilling Angle Range: 45°–90°
• Main Hoisting System
  • Maximum Hoisting Capacity: 490 kN (double-line)
  • Hoisting Speed: 20–40 m/min
• Wireline Coring Winch
  • Wireline Capacity: 4,000 m
  • Pull Capacity: 20 kN
  • Hoisting Speed: 110–200 m/min
• Power and Hydraulic System
  • Main Motor Power: 132 kW
  • Hydraulic Working Pressure: 28 MPa

Safety and Auxiliary Equipment

• 9-inch Hydraulic Double Ram BOP (5,000 psi)
• Choke and Kill Manifold System
• Hydraulic Power Tong
• NBB260/7 Mud Pump (260 L/min)
• CHD98 Double-Tube Wireline Coring System

This drilling rig is equipped with a 5,000 psi BOP, a remote real-time monitoring system (WCRI), an AI drilling parameter analysis platform, and an IWCF-trained and certified team, and can perform deep geothermal coring and exploration operations at depths of 2,500–3,600 m.

The YH-2500D provides a reliable platform for deep geothermal exploration, scientific drilling, geotechnical investigations, and mineral exploration projects, and serves as one of the core drilling assets within 3JTech’s geothermal development program.

This rig's digital monitoring system allows for real-time transmission of key drilling parameters to a remote monitoring center via the network, including:

• Drilling depth
• WOB (Whole Bit Weight)
• RPM (Rotation Speed)
• Torque
• Flow Rate
• Pump Pressure
• Pit Volume
• Mud Temperature

Related data has been stored in the cloud and a historical database has been established, which can be used as a basis for subsequent AI-assisted analysis and drilling optimization.

To meet the high-temperature drilling requirements of geothermal wells, this project has completed the construction of a real-time measurement system for mud circulation parameters, including:

• Inlet temperature monitoring
• Outlet temperature monitoring
• Mud flow rate monitoring
• Mud density monitoring
• Viscosity monitoring
• Mud level monitoring

A complete data collection mechanism has been established, enabling continuous assessment of bottom hole temperature changes, heat transfer behavior, and mud cooling efficiency. This data will also serve as an important basis for the design of high-temperature formation drilling and mud cooling systems in the future.