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Design Principles: How Exactly Are PDC Drill Bits Made?

Sep. 07, 2021

In order to enhance the optimum exploration speed, many functions should be taken into consideration on a drill little bit by drill little bit basis. During the style stage, the complete attributes of the diamond drill bit are developed and changed, such as device size, tool orientation, device density as well as nozzle setting. Formation kind, hardness, piercing specifications and also any type of orientation facets have a much better influence on the success of the general boring task.

There are five primary design principles: cutting framework, PDC device kind, body geometry, hydraulics and body product.

non core pdc bit  core pdc bit

Cutting framework

The reducing structure is the part of the drill that is proactively associated with the stratigraphy as well as general layout of the energetic polycrystalline diamond small tool in 3D space. The main variables thought about when making a PDC drill are the number and also dimension of tools and also tool alignment.

Just like various other design variables, the drilling application determines the number and also size of the PDC tools, likewise known as the ruby quantity. The device in the centre of the drill is responsible for the aggression of the PDC drill. Larger tools allow for full protection with a reduced number of devices as needed. Smaller tools permit even more intensive packing to boost the variety of devices as needed.

PDC device kinds

Tool type refers to the make-up of the specific material of the diamond table itself as well as the method utilized to manufacture the tool. Polycrystalline diamond composites are highly crafted elements and all these facets are tightly controlled.PDC devices include two adhered parts - the polycrystalline diamond composite itself as well as the tungsten carbide matrix. A polycrystalline ruby is a group of tiny single crystals of diamond adhered with each other in an arbitrary positioning. Modern PDC devices contain a vast array of mesh diamond sizes to optimise piling density as well as void quantity.

The specific building, material and also qualities of the PDC device used in the style will rely on the residential properties needed by the application. Usually, engineers need to strike an equilibrium between resistance to unpleasant wear and also the ability to endure influence damage.

Drill geometry

The geometry of the drill is identified by elements such as the form of the blade, the configuration of the metering area, the dimension of the circulation course and all various other factors connected to the shape and size of the drill. Various blade sizes, nozzle placements and variety of blades can all have a huge effect on drilling operations.

The geometry of the drill bit is figured out by the variety of blades. The blade that expands into the centre of the bit is called the main blade as well as the blade near the outside of the bit is called the additional blade. A much deeper taper angle allows for raised ruby volume, greater bit stability as well as a little bit that is much less likely to deviate from the desired angle. Smaller sized taper angles enable more aggressive diamond volume, a lot more effective WOB transfer as well as enhanced directional reaction.

Diamond + PDC Reaming Shell


The circulation of boring fluid through and also over the PDC bit, referred to as hydraulic stress, is very important to the performance of the bit. The liquid circulation cleanses and also cools the reducing framework, while also removing the drilled rock chips from the little bit surface.

Computational Liquid Characteristics (CFD) is a software application simulation package that makes use of mathematical analysis and also formulas to design and also optimize the flow. A typical drill little bit has a nozzle for each and every insert to cool down and also clean up the cutting structure as effectively as possible. On smaller sized PDC drills there might not suffice room for a lot of nozzles, but the modelling and also layout makes certain that no part of the drill is 'short' of fluid.

Body product

The base bit is made from a tungsten carbide alloy that gives raised resistance to abrasive ground wear and liquid erosion. These bodies can withstand reasonably high compression tons and also can endure formation wear. The characteristics of matrix inserts are restricted by the reasonably breakable material as well as a result reduced influence sturdiness contrasted to steel. Normally, matrix bodies are better suited to settings where the capacity for body disintegration is high.

Steel body bits are made from high alloy steel. These bits can hold up against high effect as well as are commonly designed with greater blade spacing, hence providing more room for liquid and chip elimination. The steel body product buildings and also making abilities permit intricate drill little bit accounts and hydraulic designs. Because of their sturdiness as well as ductility, the size of the inserts made from steel makes them bigger.

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