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Reverse Circulation Drill Rod or Drill Pipe

Reverse Circulation drilling, or RC drilling, uses rods with inner and outer tubes, the drill cuttings are returned to surface inside the rods. The drilling mechanism is a pneumatic reciprocating piston known as a hammer driving a tungsten-steel drill bit.

Quantity:
  • 3 1/2" 4" 4 1/2"
  • ROSCHEN
  • ROS-RP-3 1/2" 4" 4 1/2"

Product Description

Reverse Circulation drill rod or drill pipe

 

Reverse Circulation drilling, or RC drilling, uses rods with inner and outer tubes, the drill cuttings are returned to surface inside the rods. The drilling mechanism is a pneumatic reciprocating piston known as a hammer driving a tungsten-steel drill bit.

 

The reverse circulation drill rod has four threads which adds to machine operating time. The purpose of the two extra threads is to allow the inner tube to be replaced in the field. It also allows the driller to replace the box tool joint with a new tool joint, without welding and can be done at the site. - We use heat threaded 4130 alloy tool joints; this alloy allows driller to employ a hard facing program without fear of embitterment. We use a micro-alloy midsection (mid-body), ST52V, 90KS1 MIL VLD possessing a superior abrasion resistance. - Our inner tube midsection (mid-body) is a heavy-wall mechanical tube, not a pipe. The inner tube is fixed and won't vibrate under most conditions. The inner tube ends are made from a heat treated alloy and the male end is machine finished after welding for perfect alignment. - The o-ring retainers absorb the percussion forces to eliminate problems arising from the transfer of vibration and torque loads to the outer pipe. 

Available Sizes (outside diameter)

REVERSE CIRCULATION DRILL ROD SPECIFICATIONS

Thread Type

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 W.T.

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 W.T.

5.5mm

5.5mm

5.5mm

5.5mm

5.5mm

5.5mm

5.5mm

Spanner Flat

90mm

90mm

90mm

90mm

90mm

90mm

90mm

Weight 3.0m

75kg.

75kg.

95kg.

75kg.

95kg.

75kg.

95kg.

Weight 6.0m

120kg.

150kg.

168kg.

150kg.

168kg.

150kg.

168kg.

RC Drill pipe

Reverse circulation is achieved by blowing air down the annulus of the rod, the differential pressure creating air lift of the water and cuttings up the inner tube which is inside each rod. It reaches the deflector box at the top of the drill string then moves through a sample hose which is attached to the top of the cyclone. 

The drill cuttings travel around the inside of the cyclone until they fall through an opening at the bottom and are collected in a sample bag. For any drill hole there will be a large number of sample bags, each one marked to record the location and drilling depth that the sample was obtained.

The collected series of sample bag cuttings are later taken for analysis to determine the mineral composition of the drill hole. The analysis results of each individual bag represents the mineral composition at a particular sample point in the drill hole. Geologists can then survey the drilled ground analysis and make decisions about the value of the overall mineral deposit.




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