What are the common faults of horizontal directional drilling rigs?

I. Power System Failure

Typical problems: Engine fails to start, stalls under load, insufficient power, abnormally high fuel consumption, engine overheating.

Causes often include a depleted battery, clogged diesel filter, radiator contamination, and air in the fuel lines.

II. Hydraulic System Failure

Typical problems: Abnormally high oil temperature, unresponsive control levers, insufficient push/pull force, abnormal noise/oil leakage from the hydraulic motor.

Causes often include aging and contaminated hydraulic oil, clogged filter, worn oil pump/distribution valve, and loose/leaking pipe joints.

III. Guiding System Failure

Typical problems: Loss of guiding signal, severe deviation from the drilling trajectory, inability to adjust direction.

Causes often include insufficient probe battery power, interference from underground metal pipelines/strong magnetic fields, and inaccurate system calibration.

IV. Drill Rod/Drill Bit Related Failures

Typical problems: Drill rod jamming and breakage, excessive drill bit wear, and mud leakage at the joint.

Causes often include excessive drilling angle, excessive formation hardness, fatigue of the drill rod, and improper thread installation leading to wear. V. Mud System Failures
Typical Problems: Mud pump fails to pressurize, pipeline is blocked, borehole wall collapses.

Causes are often improper mud mix ratios, worn pump seals, and clogged filters.

VI. Electrical System Failures
Typical Problems: Control panel malfunctions, motor fails to start, alarm lights remain on.

Causes are often aging cables with poor contact, burnt relays/fuses, and short circuits.

VII. Reaming and Pullback Construction Failures
Typical Problems: Pipe cannot be pulled, reamer jams, pullback pipe ruptures.

Causes are often improper reaming diameter design, insufficient mud lubrication, and excessive pullback speed.