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Reverse circulation (RC) drilling
utilizes a dual-walled drill pipe (fishing rod) having a solid drill bit to
make a hole in a formation and provides rock chips (clippings) to the surface
for any subsequent analysis. The drilling mechanism is really a pneumatic
reciprocating piston (hammer) driving a tungsten-steel drill bit and a
compressor to blow the clippings, produced by the drilling operation, to the
surface. Reverse circulation is accomplished by coming air down the rods the
differential pressure produces air lift of the clippings up the inner tube that
is inside each fishing rod. Normally the air exhausts via a centrifugal
classifier to ensure that the rock chips and dust is going to be taken in a
sampler. For more information on thread protector, visit our
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The
most generally used RC drill bits are 5-8 inches (12.7-20.32 centimetres) in
diameter and have round metal "knobs" that protrude from the bit,
that are needed to drill through rock and shale. As the knobs put on down,
drilling becomes reduced and the fishing rod string could possibly become
bogged in the hole, therefore RC drill rigs must have a superior pullback
capacity and hydraulic energy, otherwise attempting to recover the rods might
take hrs and in certain cases days.
While
operating in remote sites or areas, Reverse Circulation drilling setup usually
includes several support automobiles, in addition to the rig itself. The
support automobiles hold the drilling rods (dual tube RC pipe), spares, diesel
and water tanks, in addition to every other tools and equipment needed for
resupplying and rig maintenance.
The
majority of the RC drill rigs their very own compressor to create the air
pressure required to extract the clippings. However, generally these
compressors don't have the energy for much deeper drilling, because of
insufficient space on the rig itself for the bigger, more effective models.
Alternatively, companies like Drilling Supply, are offeringcompressor free
setup, which allows the driller to utilize a compressors with assorted energy
ranked results to support their unique project, while using the the same RC
Drilling Rig its them. As a result, a damaged air compressor won't cause
disruption in the drilling procedures. While a deterioration compressor has
been fixed, a backup unit could be quickly used to carry on the drilling
operation, saving the drilling contractor energy and money.
RC
drilling routinely accomplishes depths as high as 500 metres. This depth
resembles those of Gemstone Core drilling, but unlike core drilling, RC
drilling doesn't create a solid core. The clippings produced by the RC drill
bit are usually shipped to the surface in the order in that they are created
although not always. Therefore, RC drilling isn't as accurate as Core drilling.
There's not a way of knowing having a 100% certainty which depth the clippings
originated from. Also there's a inclination for heavier minerals (e.g. gold) to
fall to the bottom of the hole or perhaps be caught in elbows and curves in the
drill pipe (Reverse Circulation Drill Pipe). Consequently, assays from RC
drilling may understate the quantity of mineralization present in the formation
however, this deficiency is basically offset by considerably lower cost of
drilling and rapid transmission rates.
Because
of this, companies like Drilling Supply allow us amultipurpose hollow spindle
rotary drive with variable/reversible hydraulic motor and automatic constant
rotation energy control. Drilling Supply are now able to offer drilling
companies a capacity to start the drilling operation with Reverse Circulation
drilling and once the mineralization warrants it and clean core samples are
needed, change to Gemstone Core drilling technique. This is accomplished by
utilizing the same drill rig and simply altering from RC drilling tool set to
Core drilling tools (coring rods and bit). This enables the driller to rapidly
and cheaply achieve the mineralization depth and begin removing quality cores
for analysis. Want to know more about OCTG? Do not forget to visit our
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