Different Methods Adopted by Rotary Drilling RIGS in Different Geological Conditions

The operational efficiency of rotary drilling RIGS is closely related to geological conditions. According to the physical characteristics of different strata, specific drilling methods and equipment configurations need to be matched. Reasonable selection of strategies can reduce construction risks and improve the quality of hole formation.

1. Muddy soil layer: Use a spiral drill bit for slow drilling, combined with thin mud lubrication to reduce resistance and prevent the drill bit from being wrapped in silt. During the drilling process, frequently lift the drill to unload soil to prevent excessive soil accumulation in the hole from hindering the operation.

2. Silt layer: Use a sand hopper with a baffle to reduce the loss of sand and soil, and at the same time inject high-viscosity slurry to reinforce the hole wall. Control the drilling speed to avoid the liquefaction of the sand layer caused by high-speed rotation.

3. Gravel layer: A toothed rock hopper is selected. The gravel is crushed under the pressure of the equipment's own weight. If necessary, impact actions are used to handle large pieces of gravel. Lift the drill once every 30 to 50 centimeters and clear the debris in the bucket in time.

4. Strongly weathered rock strata: Equipped with a toothed drill bit, it uses high rotational speed to cut the rock strata and maintains a stable downward pressure during drilling. The "drilling - crushing - slag removal" cycle mode can be adopted to gradually penetrate the rock layer.

5. Granite strata: Use a toothed roller drill bit to break hard rock masses through a combination of high-frequency impact and rotation. The stepwise reaming process is adopted, with small holes formed first and then the hole diameter gradually expanded.

6. Backfill soil layer: First, conduct advanced detection to determine the nature of the backfill material. When encountering large pieces of construction waste, use impact drill bits to break them up. When drilling, frequently check the stability of the hole wall. If necessary, lower the casing for protection.

In conclusion, rotary drilling RIGS need to precisely adapt the drilling method in complex geological conditions, and both the selection of drill bits and the operation parameters need to be adjusted in a targeted manner. Scientifically responding to the characteristics of different strata is the key to ensuring construction safety, efficiency and equipment lifespan.