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Diamond Impregnated Core Drilling Bits by Drillers Edge
Brenda Hassardon 28 August 2013
Transcript of Diamond Impregnated Core Drilling Bits by Drillers Edge
by Drillers Edge
8 things you need
to know to maximize the life and performance of your bit
diamond products • core retrieval systems • drill rod and casing
We provide core drilling tools that give drillers a real “edge” to put more core in the box per hour!
We work in partnership with you to develop a bit that meets all of your requirements. Our matrix type (T value) is a carefully combined group of materials that are designed to maximize the performance and life of the bit.
Know your ground conditions, bits are typically designed based on a hardness scale. Drillers Edge uses the MOH's scale where 1 would be the softest (i.e. sandstone) and 10 would be the hardest (i.e. diamond).
Two other characteristics you will need to know about the ground conditions are the ABRASIVENESS and COMPETENCE. These factors play an important role in matrix selection.
Abrasiveness refers to how much the rock will "wear" on the bit.
Competency describes the "state" of the rock, e.g. solid, fractured, or broken.
Of all the drill string components, bits have the largest impact on your total cost of drilling. Proper selection is key.
Impreg bits are made up of the bit body and crown. The crown is bonded to the bit body in a tightly controlled furnacing operation and is where all the magic happens.
Waterways are as important to the condition of the core as they are to the life of the bit. Having the correct flushing and lubrication ensures the bit will not be deformed due to increased temperatures or mudding (regrinding of the cuttings) and the valuable core does not get washed away.
Drillers Edge has standardized on 3 waterway options:
preferred bit geometry allowing for the most diamonds to be used for drilling (largest face contact area)
provides good fluid flow
each waterway is 0.125” (3.20 mm) wide, quantity varies according to bit size
recommended for larger bit sizes – H and P
used in more difficult conditions requiring increased fluid flow
reduced contact area allows for increased penetration rates
each waterway is 0.250” (6.35 mm) wide, quantity varies according to bit size
Drillers Edge supplies Superflush (Deep ID) waterways for difficult ground conditions when the core sample is susceptible to washing and in lost circulation conditions where heavier muds are required (unconsolidated/broken formations).
supplied as standard with triple tube bits
optional for N, H and P size bits
less restricted fluid flow past the core lifter case to the face of the bit
waterway width is the same as in WIDE, the difference occurs in the throat of the bit
offers superior results over face discharge
For more detail, download the interactive version from our
website at www.drillersedge.com
Synthetic diamonds are held in place by a combination of powders and metals that are furnaced under stringent temperature controls to create the crown. A variation in the quality, size and concentration of these diamonds will effect how the bit cuts the rock.
Ground conditions may dictate whether or not a matrix needs to be "tweaked". That is, additives can be added which will effect how the crown will hold on to the diamonds.
in broken ground the matrix will need to be a little tougher (harder) so that it can withstand the potentially damaging conditions and retain the diamonds as long as possible to maximize bit life.
in hard, competent ground the matrix will need to wear at a rate that will release worn diamonds and expose new ones so that continuous cutting can occur. This type of bit is often referred to as "free cutting".
Bit performance also relies on the skill of the driller and the power of the drill used. Some external forces effecting performance include:
RPM (Revolutions per Minute)
refers to the rotational velocity of the bit. In general, the more rotations per minute the faster the rate of penetration.
WOB (Weight on Bit)
the load (force) placed on the bit to cause an indentation or cut in the rock.
excessive weight will cause damage to your tools and possible hole deviation.
insufficient weight will slow productivity and may also cause the bit to polish.
ROP (Rate of Penetration)
this will vary for every situation
it is essential to find the optimum ROP for each rock type, drilling condition and drill utilized in order to maximize your bit usage.
flow travels past the core with limited washing
some of the flow is directed at the core which may result in washing the core
Here are some general drilling guidelines to improve the performance and extend the life of your bit.
Penetration Index - RPI (RPC)
Used to help assess if the bit is being optimized in relationship to RPM and ROP.
RPI (RPC) = RPM/ROP
e.g. RPI = 1200 rpm / 6 inches = 200 rotations per inch
RPC = 1200 rpm / 15 cm = 80 rotations per centimeter
A good target is 200 - 250 rpi (100 rpc).
Failure to circulate enough fluid can result in premature failure of the bit.
The term "impreg" (impregnated) refers to the fact that the crown
is saturated with diamonds as opposed to being set on the surface.
Various crown heights are available — Drillers Edge has standardized on 1/2 in (12.7 mm).