PDC drill bits Matrix body 8 inch for very hard formation rock
drilling
PDC Drill bit, diamond drill bits, diamond core drill bit
soft formation, medium soft formation, hard formation, medium hard
formation, very hard formation
PDC means Polycrystalline Diamond Composite or Compact.
PDC are made by combining some layers of polycrystalline diamonds
(PCD) with a layer of cemented carbide liner at high temperature
and high pressure.
PDCs are among the most rigid of all diamond tool materials.
PCD simply means Polycrystalline Diamond: PCD are normally made by
sintering many micro-size single diamond crystals at high
temperature and high pressure. PCD has good fracture toughness and
good thermal stability, and is used in making geological drill
bits.
PDC has the advantages of diamond's high wear resistance with
carbide's good toughness.
Here at Roschen, We supply PDC drill bits made with a range of
shaped cutters or polycrystalline diamond compacts (PDC) brazed on
a body.
PDC Cutters are made from carbide substrate and diamond grit. High
heat of around 2800 degrees and high pressure of approximately
1,000,000 psi forms the compact. A cobalt alloy is also present and
acts as a catalyst to the sintering process. The cobalt helps bond
the carbide and diamond.
As a general rule, large cutters (19mm to 25mm) are more aggressive
than small cutters. However, they may increase torque fluctuations.
Smaller cutters (8mm, 10mm, 13mm and 16mm) have been shown to drill
at higher ROP than large cutters in certain applications. One such
application is limestone for example.
Additionally, small cutters produce smaller cuttings while large
cutters produce larger cuttings. Large cuttings may cause problems
with hole cleaning if the drilling fluid cannot carry the cuttings
up.
(1) or (2) Soft and soft sticky-Highly drillable formations such as
clay, marl, gumbo and unconsolidated sands.
(3) Soft-medium-Low compressive strength sands, shale and
anhydrites with hard layers intermixed.
(4) Medium-Moderate compressive strength sand, chalk, anhydrite and
shale.
(6) Medium hard-Higher compressive strength with non-or semi-sharp
sand, shale, lime and anhydrite.
(7) Hard-High compressive strength with sharp layers of sand or
siltstone.
(8) Extremely hard-Dense and sharp formations such as quartzite and
volcanic rock.
PDC CUTTING STRUCTURE
Very soft (1) to medium (4) formation type pdc bits have one
dominant size of PDC cutter. PDC cutting structure is denoted in
the following way:
2 – this bit has mostly 19mm cutters
3 – this bit has mostly 13 mm cutters
4 – this bit has mostly 8 mm cutters
Conversion Chart Inches to Millimeters
This chart converts inches and fraction of inches into exact
millimeters. Used for drilling tools sizes, drilling head sizes and
rod ODs.
Since 1959, the inch (in) has been defined and internationally
accepted as being equivalent to 25.4mm (millimetres).
mm = in/0.039370
For more information, please contact:
ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED
Skype: ROSCHEN.TOOL , ROSCHEN_GROUP
WeChat: +86-137 6419 5009 ; +86-135 8585 5390
WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390
Email: roschen@roschen.com ; roschen@roschen.net
Website: http://www.roschen.com ; http://www.roschen.net
http://www.roschen.cn ; http://www.roschendrill.com
http://www.roschenmining.com ; http://www.roschendrilling.com
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