How Should The Rotational Speed, Pressure And Depth of Footage of Rotary Drilling Tools Be Matched

When a rotary drilling rig is in operation, the combination of the rotational speed, pressure and depth of the drilling tool is a science. A reasonable combination can significantly improve the construction efficiency and quality. Now let's talk to you about how these three can work together.

1. Soft soil layer: In soft soil layers such as clay and silt, the rotational speed of the drilling tool can be appropriately increased, with 10 to 15 revolutions per minute being appropriate. A relatively small pressure should be applied, and the depth of footage should be controlled at 0.5 to 1 meter to prevent hole collapse and achieve rapid hole formation.

2. Sand layer: The sand layer particles are loose. The rotational speed is maintained at 8-12 revolutions per minute, with moderate pressure. Each advance is 0.3-0.6 meters to prevent the sand layer from collapsing and ensure the stability of hole formation.

3. Gravel and gravel layer: For the gravel and gravel layer, reduce the rotational speed to 6-10 revolutions per minute, increase the pressure, and achieve a drilling depth of 0.2-0.4 meters. Through stable pressure to break the gravel and gravel, ensure smooth drilling.

4. Rock strata: When drilling into rock strata, the rotational speed should be slow, at 4 to 8 revolutions per minute. Use a relatively high pressure to break the rock. The drilling depth should be 0.1 to 0.3 meters to avoid excessive wear of the drilling tools.

5. Backfill soil layer: Due to the complex composition of the backfill soil, with a rotational speed of 8-10 revolutions per minute, moderate pressure, and a depth of 0.3-0.5 meters, it is suitable for exploratory drilling to handle complex situations.

6. Complex stratum transition: When encountering transitions in different strata, the rotational speed, pressure and depth of footage should be gradually adjusted. The rotational speed variation should be controlled at 2-3 revolutions per minute, the pressure should be slightly adjusted, and the depth of footage should be increased or decreased by 0.1-0.2 meters accordingly to ensure a smooth transition.

In conclusion, the combination of the rotational speed, pressure and depth of footage of rotary drilling tools should be closely integrated with the characteristics of the formation. Soft soil undergoes rapid and shallow advance with less pressure, while hard rock undergoes slow and deep advance with strong pressure. Complex strata can be flexibly adjusted. Only when the three work in coordination can the rotary drilling rig operate efficiently and ensure the quality and progress of the construction.