Double Wall Drill Pipe

Reverse Circulation RC Drilling Rods is also called Double wall drill pipe, double drill pipe or Dual Wall drill pipe. It consists of two layers of inner and outer drill pipes (called inner pipe and outer pipe). The inner and outer pipes constitute an annular gap,

Product Details

Reverse Circulation RC Drilling Rods

Reverse Circulation RC Drilling Rods is also called Double wall drill pipe, double drill pipe or Dual Wall drill pipe. It consists of two layers of inner and outer drill pipes (called inner pipe and outer pipe). The inner and outer pipes constitute an annular gap, which is a channel for pumping the flushing medium to the bottom of the hole when hydraulic rock drilling and center sampling drilling. The central hole of the inner tube is fixed as a whole by discharging the flushing medium, and each double-walled drill pipe is connected with the screw of the outer tube to ensure transmission of torque and pressure. The inner tube is usually connected by a plug-in method, which generally only serves as a flushing medium. Therefore, a sealing device is required at the plug-in place.


Dual Wall Drill Pipe
Double Wall Drill Pipe


Double Wall Drill Pipes are used in drilling of wells with diameter 84 and 93 mm and depth up to 300 m in soils of II-V drillability classes with seams of soils up to VII drillability class in the fulfilment of all necessary prospecting and geochemical operations, in geological mapping and exploration of deposits of solid minerals.

 

Drilling of wells is carried out with hydro-transport of the core delivered on the surface along the internal channel of the double drill string.

Double Wall Drill Pipes
Dual Wall Drill Pipes


Reverse circulation drill pipe/Double wall drill pipe/Dual Wall drill pipe

Outer tube O/D in

Inner tube  in

Lerngth  m

Type of thread

Range of drill in

3 1/2

1 1/2

3 ~ 6

Remet, Metzke, Matrix, others

4-1/8-4-3/4

4

2

3 ~ 6

Remet, Metzke, Matrix, others

4-3/4-5-1/2

4 1/2

2 & 2-1/2

3 ~ 6

Remet, Metzke, Matrix, others

5-1/8-6

6 5/8

3

3 ~ 6

Remet, Metzke, Matrix, others

7-7/8-15

10 3/4

5

3 ~ 6

Remet, Metzke, Matrix, others

Over 15

* Roschen offers reverse circulation drill string components in accordance with the requirements of the customer. Reverse circulation drill pipes available in different model, diameters and length.


Reverse Circulation Drill Rod Specifications

Type  / Thread

Remet

Remet

Remet

Metzke

Metzke

Matrix

Matrix

Rod O.D.

3 1/2"

4"

4 1/2"

4"

4 1/2"

4"

4 1/2"

Outer tube O.D.

88.9mm

101.7mm

114.3mm

101.7mm

114.3mm

101.7mm

114.3mm

Outer tube I.D.

81.8mm

94.6mm

107.2mm

94.6mm

107.2mm

94.6mm

107.2mm

Outer tube WT

5.3mm

7.1mm

7.1mm

7.1mm

7.1mm

7.1mm

7.1mm

Inner tube O.D.

38.1mm

50.8mm

63.5mm

50.8mm

63.5mm

50.8mm

63.5mm

Inner tube I.D.

32.6mm

45.3mm

58mm

45.3mm

58mm

45.3mm

58mm

Inner tube WT

5.5mm

5.5mm

5.5mm

5.5mm

5.5mm

5.5mm

5.5mm

Spanner Flat

90mm

90mm

90mm

90mm

90mm

90mm

90mm

Weight 3.0 m

77 kg.

77 kg.

97 kg.

77 kg.

97 kg.

77 kg.

97 kg.

Weight 6.0 m

125 kg.

155 kg.

172 kg.

155 kg.

172 kg.

155 kg.

172 kg.


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