Large Torque 89mm Pipe Pneumatic Drilling Rig Yuchai Engine

The ST400m Pneumatic Drilling Rig is engineered for demanding drilling applications with a maximum depth of 400 meters and hole diameter of 300mm. Powered by a reliable Yuchai engine, this rig delivers exceptional performance across diverse environments including deserts, swamps, grasslands, mountains, and agricultural settings.

• Hydraulic automatic feeding mechanism improves drilling efficiency and reduces labor intensity
• Ball clip holding mechanism or hydraulic chuck enables rod changes without stopping operation
• Hole bottom pressure gauge provides real-time monitoring of downhole conditions
• Compact structure with concentrated handles, small footprint, and lightweight design
• Strong decomposition capability for easy transportation and operation in plains and mountain areas

Preventive measures for hole collapse require meeting two essential conditions: mud liquid column pressure equals technological pore pressure, and minimizing water infiltration into rock and soil or water seepage around the hole wall.

Prevention for Geological Factors:

• Increase mud density to enhance mud liquid column pressure for balancing formation pressure
• Use higher mud-to-plastic ratios to protect the hole integrity

Prevention for Physical Factors:

• Start pumps gradually and maintain constant drill pipe tension to avoid sudden pressure increases and tool impact on hole walls
• Optimize drilling track design and reaming procedures based on underground obstacle distribution to minimize rotary extrusion from excessive guide hole curvature
• Control mud density and rheological properties to maintain adequate liquid column pressure with low mud return velocity