Drilling Pipes and Reverse circulation drill pipes

1. DRICONEQ
“Reverse Circulation
Pipe”
Drill

2. Basic Of Reverse Circulation
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 tungstensteel drill bit.
 RC drilling ideally produces dry rock chips, as
large air compressors dry the rock out ahead
of the advancing drill bit.

3. Contd.
 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.

4. Reverse Circulation Type
Reverse Circulation Drilling Center Sampling
with special Center Sample Hammer.
 Conventional Down Hole Hammer

5. Centre Sampling
 This is the newer of the two methods.
This method uses a special Center Sample
Hammer with a hollow center that allows
the sample into the dual wall drill pipe
right at the face of the drill bit.
 The advantage of the Center Sample
Hammer is the sample goes immediately
into the drill pipe without having to travel
up the side of the conventional hammer
and into the interchange (aprox 4 feet).

6. Conventional Sampling
 This is the original RC with a conventional
Down Hole Hammer and a 'Interchange'
(adaptor just above the hammer with a
vertical slot to let the sample into the center
of the Dual wall drill pipe.
 The conventional reverse circulation system
works very well usually producing more
footage in a day than the Center Sample
system therefore the price is a little lower
per meter.
 The hole sizes available in this style range
from 3 1/2" up to 24".

7. Application
Coal Mining
Mineral and Energy Exploration
Extraction of Ores.
Engineering and Environmental application
Investigation and grade control
Cementing

8. Advantages of Reverse Circulation
Drilling
 Direct drilling cost reductions in the range of 25% to
40%.
 Faster completion of drill programs with quicker
delivery of results.
 Reduced man-hours at the drill with decreased
exposure to potential accidents.
 Reduced contractor activity in the mine reduces mine
support burden.
 Indirect cost reductions gained from a simplified
sampling process.
 Requires less water than diamond drilling.

9. RC Drilling compared to other drilling
methods
FEATURE
RAB DRILLING
RC DRILLING
DIAMOND
DRILLING
COST
Low
Reasonble
High
TIME
Fast
Efficient
Low
SAMPLE QUALITY
Low
Reliable
High
DEPTH
0m – approx 125m
0m – approx 500m
0m – approx 1800m
TECHNIQUE
Air forces rig
through the ground
and brings rock chip
samples to surface
outside of Inner
Tube
Air forces rig
through the ground
and brings rock chip
samples to surface
inside the Inner
Tube
Air forces rig
through the ground
and brings rock chip
samples to surface
inside the Inner
Tube

10. DRICONEQ DRILL PIPE

11. Flush Drill pipe
Flush Joint Drill Pipe
Heavy Duty External Flush Drill Pipe
External Upset Drill Pipe

12. Regular Flush Drill Pipe
The drill string is tapered to
maximize strength and hanging
length by using lighter 5 in.
outside diameter (OD) drill pipe
on bottom to reduce the weight
and stronger 5 in. OD drill pipe
(Fig.)on top where bending
stresses are higher.

13.  The flush joint drill pipe is made of extra
heavy duty steel pipe with heat-treated tool
joints. Shrink fit and welded on. Wrench flats
are provided on tool joints. Available in 5, 10,
15, 20 and 25 feet lengths.
Size
Wall
Thickness
ID of Tool
Joint
Tool Joint
Thread
3 1/2”
0.300”
1 3/4”
2 3/8 API IF
4 1/2”
0.337”
2 7/16”
3 1/2 API FH

14. Flush Drill Pipe For Blast Hole
 Heavy duty external flush drill pipe
for BLAST HOLE DRILLS up to 8 5/8" OD and
wall thickness up to 1" and length up to 35
feet with API or BECO thread connections
having break out flats on tool joints are
available on request.

15. EXTERNAL UPSET DRILL PIPE
The External upset drill pipe is
made of seamless steel tube with
API Internal Flush tool joint
connections. Tool joints are heat
treated. Threads are specially
processed to prevent galling.
Counter bore welded joints are
also available.

16. Cont.
Size
ID OF
TOOL JOINT
OD OF
TOOL JOINT
CONNECTION
Length
2 3/8”
1 3/4”
3 3/8”
2 3/8 API IF
20’ - 22’
2 7/8”
2 1/8”
4 1/8”
2 7/8 API IF
20‘ - 22’
3 1/2”
2 11/16”
4 3/4”
3 1/2 API IF
20‘ - 22’

17. Drill pipe tube and pipe strength
specifications
Drill Pipe
Tube OD
(in.)
Drill Pipe
Tube ID
(in.)
Nominal
Weight
Tube
(lb/ft)
Adjusted
Overall
Joint
Weight
(lb/ft)
API
Steel
Grade
100%
Tensile
Strength
(lb)
Cond. 1
Pipe 80%
Tensile
Strength
(lb)
5
4.276
19.50
22.1
S-140
738,443
590,754
5 1/2
4.500
26.67
31.9
S-140
1,099,557
879,645

18. Thank You