Diamond Drilling Bit 9-1/2 " PDC Bit Of Oilfield Drilling Tool
1 . Descriptions:
PDC Drill Bits consist of four main components:
- Cutters: Typically cylindrical, with a thin layer of synthetic diamond on
a tungsten carbide substrate, used for cutting during drilling.
- Cutting Structure: Often the most complex part of the design, featuring rows of
cutters arranged for effective debris removal.
- Blades: With chip flutes between them, serving as channels for drilling
fluid to wash away drill cuttings from the bit face.
- Bit Body: The main structure of the PDC drill bit, classified into matrix
and steel bodies, connecting to the drill string and supporting the
cutting structure.
2. PDC Bit Specification:
Polycrystalline diamond compacts PDC bit in the Oil and Gas
Industry PDC bits get their name from the polycrystalline diamond
compacts used for their cutting structure. A PDC bit is a drill bit
fitted with industrial diamond cutters instead of hardened metal
teeth.
SPECIFICATION
|
| Size : | 9-1/2 " inch (241.3mm) |
| Drill Body Type : | Steel Body |
| Blades Quantity : | 6 |
| Nozzles Quantity : | 6 |
| API Connection (in) : | 6-5/8" REG |
| Gauge Length (In): | 2 |
OPERATIONAL PARAMETERS
|
| Weight on Bit (KN): | 22 -112 |
| RPM Range(Rotary): | 80- DHM |
| Flow Rate(lps): | 29- 38 LPM |
| Make-Up Torque(KN): | 16-22 KN.M |
3 . PDC Drill Bit profile
PDC (Polycrystalline Diamond Compact) drill bit is designed,
serving as a basis for analyzing, designing, and selecting suitable
PDC drill bits. The design encompasses considerations of bit
material, cutting structure, PDC cutter type, bit body geometry,
and hydraulic system.
PDC drill bits utilize rock shear for drilling and consist of four
main parts: cutters, cutting structure, blades, and bit body.
Cutters: Typically cylindrical, with a thin layer of synthetic diamond
deposited on a tungsten carbide substrate. During drilling, the
integrity of the cutter shape is crucial to ensure the bit operates
reliably according to its designed 3D geometric cutting structure.
Cutting Structure: While seemingly simple, it is often the most complex part of PDC
drill bit design. The cutters are arranged in rows to facilitate
better cleaning of rock debris. Each row is positioned along the
top of the blades, protruding downwards, supporting the cutting
structure and maintaining it in place while effectively connecting
the cutting structure to the end of the drill string. Between the
blades are chip flutes, which serve as channels for drilling fluid
to flush drill cuttings away from the bit face as the hole is
drilled.
Blades: Long blades and short blades are arranged in pairs and staggered
along the radial direction of the drill bit. The design of the
blades and their arrangement play a critical role in the bit's
performance.
Bit Body: It can be classified into matrix body and steel body. The
interface of the PDC drill bit is made of steel, transitioning to
tungsten carbide on the outer surface.
4 . Drill Bit PDC Cutters
Polycrystalline Diamond Composite (PDC) cutters are the main point
of contact for a drill bit. PDC bits remove the rock mainly by
shearing.
The PDC cutters are exposed to a lot of heating and cooling down
the well, a very challenging environment.
PDC cutters that have lower thermal degradation and more thermal
stability generally achieve higher ROP and increased wear
resistance. So, optimizing the cutter is important.
5. PDC Drill Bit Nozzles
PDC Drill bit nozzles help clear the cutting area and cool the
Polycrystalline Diamond Composite (PDC) cutters.
Effective placement of these nozzles along with the angle they are
set at plays a critical role on how efficient the drill bit
performs.
Fluid channels also complement nozzle placement to improve the
clearing of cuttings.
6. Steel Body PDC Bits
Steel body of PDC Bit is the opposite of matrix body. It can of
withstanding high impact loads, but is softer and lacks protective
features. The strength and ductility of steel give steel-bit bodies
high impact resistance.
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.
Polycrystalline diamond compact (PDC) drill bits are different than
roller cones in that they are one piece bodies with no moving
parts. The fixed-cutters shred the rock, so the bit is able to
operate with higher rotation speeds more efficiently in
consolidated formations.
