Reverse Circulation Double Wall Drill Pipe

Product Introduction

Reverse Circulation Double Wall Drill Pipe is a specialized drill pipe used in drilling operations. It's commonly employed in Reverse Circulation Drilling, a method that involves creating a reverse flow of cement slurry within the drill pipe to transport cuttings from the bottom of the borehole to the surface.The unique structural design of the Reverse Circulation Double Wall Drill Pipe assigns distinct roles to the inner and outer walls, facilitating the transmission of cement slurry and cuttings, effectively preventing groundwater pollution, and enhancing cuttings recovery. This type of drill pipe is suitable for drilling operations that require safeguarding groundwater resources, improving cuttings recovery, and preventing environmental pollution.

Working Principle

Taking the DTH drilling rig as an example, the compressed air enters the annular gap of the double-arm drill pipe through the air-box, and reaches the bottom drilling tool along the annular gap. Return from the inner tube to the ground. An appropriate amount Hammel of foaming agent can be injected into the compressed air to form air foam for drilling, which further improves its ability to carry Bit cuttings back up.

Application Combination

For the DTH Drilling Machine:

From top to bottom step is Water Tap-Power Head-Air Box-RC Drill Pipe-Drilling Tools.

For rotary drilling rigs：

From top to bottom step is Dual-channel gas tap-RC Drill Collar-RC Drill Pipe-Drilling Tools. Drilling Tools as follows:

1. Packer + Left and Right Thread Adapter+ DTH Hammer and Bit

2. Through Types DTH Hammer

3. Diversion joint + Tricone Drill Bit (or Drag Bit, PDC Bit).

Advantages

• Groundwater Protection: The dual-wall structure significantly reduces the risk of groundwater contamination.

• Efficient Reverse Circulation: Specially designed for high-efficiency reverse circulation operations, enhancing debris recovery.

• Durability and Stability: Constructed from highly durable materials, suitable for various geological conditions.

TS-CSR double wall drill pipe

Double wall deill pipe for coal mine

Air-life reverse circulation double-wall drill pipe

Technical features

• 1.Compared with the positive circulation drilling, the drilling efficiency is greatly improved because the cuttings are returned from the inner tube, the return speed is fast, the ability to carry cuttings is strong, and the bottom of the hole is clean;

• 2. Because of no water or very little water consumption, It's especially suitable for drilling in dry and leaky formations;

• 3. If the outer flat double-arm drill pipe is used, it can solve the problem of drilling in collapsed, broken and shrinkage formations;

• 4. Air, air atomization, air foam, foam mud, Mud or clean water is used as the flushing medium, which belongs to the multi-process medium drilling technology.

• 5. According to the characteristics of the formation and the flushing medium, various types of drill bits can be used for drilling.

  
  

Applicability

Ideal for efficient, safe, and eco-friendly drilling operations, particularly in scenarios where groundwater protection is crucial, such as mining exploration, water well drilling, among others.

Conclusion

The Reverse Circulation Double Wall Drill Pipe stands as an innovative and efficient drilling tool, offering a reliable solution for groundwater protection, enhanced debris recovery, and reduced environmental impact. Contact us to discover more about this groundbreaking product.