12 1/4 inch PDC bit M166
Number of Blades | 6 |
Primary Cutter Size | 16mm |
Nozzle Qty. | 7NZ |
Gauge Length | 3 Inch |
RPM (r/min) | 80~250 |
WOB(KN) | 30~140 |
Flow Rate (lps) | 28~70 |
Application |
Soft to medium-hard formations with low compressive strength interbedded with hard layer , such as claystone,marl,lignite, sandstone,anhydrite, tuff, etc. |
Features |
The M1662 is a matrix body PDC bit with 6 curved blade with back-reaming and spiral gauge protection. Optimized Hydraulie design and enhanced cleaing and cooling effects of the bits to prevent bit from balling. |
Polycrystalline diamond compact (PDC) bits deliver premium performance and durability for a wide range of standard drilling applications. These matrix- and steel-bodied bits incorporate the latest cutter technology, computational fluid dynamics (CFD), enhanced hydraulics, and various structure geometries to maximize ROP.
**Matrix-body bit
Matrix-body PDC bits are commonly preferred over steel-body bits for environments in which body erosion is likely to cause a bit to fail. For diamond-impregnated bits, only matrix-body construction can be used.
** Steel-body bits
The strength and ductility of steel give steel-bit bodies high resistance to impact loading. Steel bodies are considerably stronger than matrix bodies.A beneficial feature of steel bits is that they can easily be rebuilt a number of times because worn or damaged cutters can be replaced rather easily. This is a particular advantage for operators in low-cost drilling environments.
clay
siltsone
sandstone
Rock hardness and bit selection
Cone bit IADC code
PDC
Formation
Rock Types
Compressive strength (Mpa)
ROP(m/h)
111/124
M/S112~M/S223
Very soft: low viscosity, low compressive strength.
<25
>20
116/137
M/S222~M/S323
Soft: the formation is soft with low compressive strength and good drillability.
Clay rocks
lignite
sandstone
25~50
10~20
417/527
M/S323~M/S433
Medium soft: weak to medium, low compressive strength.
Clay rocks
sandstone
siltstone
anhydrite
limestone
50~75
5~15
517/537
M322~M443
Medium to hard formation with high compressive strength and poor abrasion resistance.
mudstone
Sandy limestone
shale
75~100
2~6
537/617
M422~M444
Medium hardness: hard, dense formation with high compressive strength and moderate wear.
The marble
granite
Hard shale
anhydrite
sandstone
dolomite
schist
100~200
1.5~3