PDC bit
PDC bit is short for polycrystalline diamond composite bit. It is a drilling tool commonly used in geological drilling industry. PDC bit is mainly composed of bit body, PDC cutter, nozzle, gauge surface and joint.
In recent years, the quality and type of PDC cutters have changed dramatically. If you compare the teeth of the 1980s to those of today, the difference is considerable. Due to the changes in the mixing process and manufacturing process, the quality performance of today's cutters is much better, so that the drill's erosion resistance and impact resistance are greatly improved.
The engineers also optimized the interface between the tungsten carbide substrate and the synthetic diamond to improve the toughness of the cutters. Innovations in the layered diamond process are also used to improve the product's abrasion resistance and thermal stability.
In addition to developments in materials and manufacturing processes, PDC products have also achieved major breakthroughs in tooth design technology and tooth layout. PDC products can now be used where previously they could not, such as in harder, more abrasive and variable formations. This expansion into new areas has had a great impact on the balance between diamond (fixed cutter) bits and cone bits.
Initially, PDC bits could only be used in soft shale formations because hard intercalations could damage the bit. However, due to the emergence of new technologies and structural changes, PDC bits can now be used to drill hard interbedded and long hard rock formations. PDC bits are becoming more and more popular, especially as the quality of PDC teeth continues to improve.
As a result of improvements in bit design and teeth, the orientability of PDC bits has also increased, further reducing the advantages of roller bits used in motor drilling. Today, PDC bits are eliminating the market for cone bits in drilling applications in many formations on a daily basis.
PDC bits can be divided into:
Fetal PDC bit: Fetal diamond composite piece (PDC) bit is a kind of cutting bit that welds the diamond composite piece on the drill head carcass by brazing method. The matrix bit is sintered with tungsten carbide powder, brazed on the tungsten carbide matrix with synthetic polycrystalline diamond composite sheet, and kept diameter with natural diamond.
Steel type PDC bit: steel PDC bit is formed by mechanical processing of nickel, chromium and molybdenum alloy. After heat treatment, the drill is drilled in the bit body, the artificial polycrystalline diamond composite sheet is pressed into the (tight fit) bit body, and the diameter is maintained with cylindrical tungsten carbide.
PDC bits applicable industry classification:
Geological exploration with composite sheet drill: mainly used for geological exploration of composite sheet drill, suitable for soft to medium hard rock, now some manufacturers newly developed new composite sheet can be applied to ten hardness of rock.
Coal field drilling using composite piece bit: mainly used for coal seam drilling and mining. Generally speaking, the rock layer of coal field is relatively soft, and composite bit is widely used, such as anchor bit, three-wing bit and so on.
Compound sheet drill for oil exploration: mainly used in drilling of oil and gas fields. At present, the oilfield composite bit is the most expensive and demanding of all composite bit. Can be said to be the aristocrat inside the composite bit.
