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DR (Direct Rotery) Drillling Service

Direct Rotary Borewell Drilling (DR) is a common and efficient method used for drilling borewells, particularly in areas where rapid and deep drilling is required. The technique is well-suited for drilling through a wide range of soil types and rock formations. Here's a breakdown of how the Direct Rotary Borewell Drilling method works and its advantages:

How Direct Rotary Borewell Drilling Works

1. Rotary Drill: The system uses a rotary drilling rig with a rotating drill bit attached to the end of a hollow drill pipe. This drill bit, typically made of tungsten or diamond-tipped steel, is designed to cut through different types of materials such as soil, sand, or rock.

2. Mud Circulation: A significant feature of direct rotary drilling is the use of a drilling fluid, commonly a mixture of water and bentonite or polymer-based fluids. This fluid is pumped down through the hollow drill pipe and out of the bit as it cuts into the ground. The drilling mud serves multiple purposes:

   • It cools and lubricates the drill bit.

   • It helps transport cuttings (loosened material from drilling) to the surface.

   • It stabilizes the borehole by preventing it from caving in, particularly in loose formations.

3. Drill Bit Rotation: The drill bit at the bottom of the drill pipe rotates rapidly, crushing or cutting the material it comes into contact with. The drilling fluid helps remove these cuttings and brings them to the surface.

4. Continuous Operation: The operation is continuous, as the rig drills deeper into the ground. Additional lengths of pipe are added to the drill string to accommodate deeper drilling.

5. Well Casing: As the borehole progresses, steel or PVC casing pipes may be installed to prevent collapse and to maintain the integrity of the well. This casing also helps in preventing contamination of the water from surface pollutants.

Currently we follow Pneumatic Rig to surface and in well by 4", 6", 8", 10" , 12" inch borewells. Technically 4", 6", 8", 10" & 12" are the diameter of the drilling bit to ensure the size of the borewell.

The depth that Direct Rotary Borewell Drilling (DR) can achieve depends on several factors, including the type of equipment used, the geological conditions, and the specific project requirements.

• Shallow Borewells (Up to 50 meters):

  • Ideal for areas with high water tables or shallow aquifers.

  • Common in soft soil or sand-based terrain.

• Medium Depth Borewells (50 to 200 meters):

  • Suitable for most residential and agricultural water wells.

  • Often used where the water table is deeper or where multiple aquifers need to be accessed.

• Deep Borewells (200 to 600 meters or more):

  • Common in regions with deep groundwater levels.

  • Required in hard rock areas where water is located much deeper below the surface.

  • Frequently used for industrial or municipal water supply projects.

• Very Deep Borewells (600 to 1,200 meters and beyond):

  • Utilized for specialized projects like geothermal wells or deep groundwater extraction for industrial use.

  • Can reach extreme depths in challenging geological formations like hard rock, limestone, or bedrock.