Techniques for Adjusting the Guiding Angle of a Horizontal Directional Drilling Rig

I. Key Operating Techniques

1. Anticipate Formation Influence: Before entering alternating layers of soft and hard rock or pebble layers, fine-tune the tool face angle based on the geological report, reserving a compensation angle to prevent the drill bit from "heading up" or "heading down."

2. Control the Advancement Pace: Maintain a uniform speed during directional drilling to avoid excessive deviation caused by sudden thrusts; control each directional advance segment to 1.5-3 meters to ensure a stable formation of the new trajectory.

3. Precise Tool Face Angle Positioning: Use the directional control system to align the guide plate with the target direction (e.g., 12 o'clock upward, 6 o'clock downward), and lock the drill rod after adjustment to prevent rotational deviation.

4. "Retraction Verification" to Confirm the Benchmark: Before correction, retract 1-2 drill rods to a stable section to confirm that the original trajectory has not drifted before implementing adjustments to avoid miscorrection.

II. Adjustment Strategies for Different Working Conditions

1. Soft Soil Layer: Prone to "drift," requiring shortened measurement intervals to 2 meters. High-frequency fine-tuning should be employed, with tool face angle adjustment controlled within 2%.

2. Gravel Layer: Loose particles cause drill bit slippage. It is recommended to use a beveled guide head to enhance directional accuracy, along with high-volume drilling mud to stabilize the borehole wall.

3. Rock Layer: High drilling resistance and slow response. The directional advance time should be extended, and mud cooling should be strengthened to prevent overheating and loss of attitude control.

4. Long-Distance Crossing: Employ bidirectional drilling with intermediate docking technology, drilling synchronously from both ends. Coordinate comparison is performed at the convergence point, significantly reducing the pressure of unilateral correction.

III. Auxiliary Technologies to Improve Accuracy

1. In areas with high-voltage lines and dense metal structures, use wired sensors to transmit data, avoiding distortion of wireless signals due to electromagnetic interference.

2. Use a ground beacon system for artificial magnetic field calibration, significantly improving positioning reliability in complex environments.

3. Utilize BIM 3D modeling to simulate the drilling path and pre-plan the tool face angle settings for key points to achieve "construction according to the drawing."

IV. Operational Habits Recommendations
1. Measure every 3 meters of drilling; if a deviation > 0.3 meters is found, immediately initiate correction.
2. Control the change in inclination angle for each correction within 2%~4% to avoid "abrupt corrections and adjustments" that could lead to reverse deviation.
3. After resuming rotation, continuously monitor for 1~2 meters to confirm trajectory stability before continuing conventional drilling.