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The heart of any Rotary Drill string is the BIT.
Correct selection is vital to ensure optimum pentration rates, bit life and cost effectiveness for the particular application.
Too often price is the deciding factor when selecting a rotary drilling bit, with low cost bits tending to be poorly engineered, causing problems through premature failure of components, which can lead to serious down-time or even lost holes.
Bit selection is governed by the type of rock to be drilled, the type of flush to be used, the ability to apply load to the bit and the application.
There are two main types of rotary drill bits: A DRAG BIT with no moving parts that cut by a combination of shearing and gouging, predominantly used in softer sedimentary rock types: Although there is an increasing use of Polycrystalline Diamond Compact PDC bits, which use the enhanced physical properties of diamonds to rapidly cut through the formations, including harder rock types.
Large diameter dragbit and casing ring bit
The other type of rotary drill bit is the ROLLER CONE BIT, where a number of cones (predominantly three) are rotated and their interaction with one another breaks the formations allowing the flush to lift the cuttings to the surface.
Depending on the formation to be drilled and the ability to apply weight (loading) to the bit will determine the type of cone that will be used, either a MILLED TOOTH, where the cutting teeth are milled from a single piece of steel for each cone, or a TUNGSTEN CARBIDE INSERT, where the cones literally have tungsten carbide teeth inserted.
The physics of rotary drilling are complex, yet a simple phone call to us can help you optimise your rotary drilling operations through correct bit selection.
We aim to stock and supply a comprehensive range of rotary drilling bits for all applications, call us to discuss your requirements.
Finally, a hole can only be drilled if the cuttings produced by the drill bit can be efficiently cleread from the base of the hole and transported to the surface. Again the science of flushing mediums and their correct selection is a complex, but if you go to the section on FLUSHING we will try and help you find the best solution, which is not always as obvious as it may seem.
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