PDC drill bits — superior performance for HDD and directional drilling.

PDC pilot bits

• Sizes: 3" to 8" diameter — small-diameter down to 1" available
• 3–6 blade designs with multiple cutters per blade
• Steel-body construction for toughness in shallow intervals
• Excellent directional control in soft to medium formations
• Compatible with mud motors or rotary drive

Many more sizes available — call for full list.

PDC reamers / hole openers

• Sizes: 12" to 48"+ for pipeline crossings
• Multi-stage layout with tapered pilot sections
• Replaceable cutter blocks with PDC inserts
• 3–4 arm designs for ample flow and cuttings removal
• Built-in stabilizer pads to prevent vibration

Custom sizes and configurations — call for availability.

PDC rock bits

• Multiple diameters in stock
• High cutter density for hard rock intervals
• Standard 13mm cutters effective to 40,000–45,000 PSI confined strength
• 8mm cutter designs push to 50,000+ PSI capability
• Heavy-set designs with backup cutters for protection

Applications: oil & gas, geothermal, mining exploration.

Slant-face directional bits

• Sizes: 4" to 7-1/2" diameter typical
• Asymmetric angled cutting face for steering without motor
• Duckbill/spade design for soft-ground navigation
• Bent housing designs for quicker steering response
• Effective in formations up to 3,500 PSI UCS

Essential for utility and shallow horizontal bores.

Blade configurations

• 3–4 blades: aggressive cutting, higher ROP in soft formations
• 5 blades: balanced design for speed with stability
• 6+ blades: maximum stability in hard / abrasive rock
• More blades = distributed load, reduced vibration
• Fewer blades = larger junk slots, better cuttings flow

Connection types

• 2-3/8" Reg (NC23): 3"–5" bits, lighter torque loads
• 2-7/8" Reg (NC31): 5"–6" bits, mid-size applications
• 3-1/2" Reg (NC38): 7-7/8" to 9-7/8" bits
• Larger connections (4-1/2"+) for 12"+ bits
• API Spec 7-1 compliant for interchangeability

Crossover subs available for rig compatibility.

Soft formations (0–5,000 PSI)

• Clay & gumbo: very high ROP, watch for bit balling
• Soft shale: 2–4× faster than tricone performance
• Loose sand: excellent penetration rates
• Chalk: ideal PDC application
• Use 3–4 blade bits for maximum aggression
• High RPM, lighter WOB prevents sticking

Medium formations (5,000–15,000 PSI)

• Sandstone: 45–65 ft/hr (vs 25–40 ft/hr tricone)
• Limestone: excellent shear cutting, very PDC-friendly
• Mudstone: efficient drilling with gradual wear
• Siltstone: good performance if not interbedded
• 25–35% ROP advantage over tricone typical
• 5-blade designs offer balanced performance

Hard formations (15,000+ PSI)

• Hard sandstone: requires high-grade cutters
• Dolomite: possible with heavy-set PDC
• Granite (30,000+ PSI): consider tricone alternative
• Chert/quartzite: high abrasion, rapid wear risk
• 6+ blade designs for stability and durability
• Above 40,000 PSI, evaluate tricone economics

Cutter damage

Symptoms: chipped, fractured, or worn cutter edges.

• Reduce RPM or WOB if vibration detected
• Add shock sub or stabilizer near bit
• Use high-impact grade cutters for interbedded zones
• Monitor torque fluctuations as early warning

Vibration issues

Stick-slip, bit whirl, and BHA resonance.

• Increase RPM slightly to overcome stick-slip
• Reduce RPM for whirl or use anti-whirl bit design
• Adjust one parameter at a time to find stable zone
• Check BHA stabilizers for wear or imbalance

Thermal wear

Polished/glassy cutters, heat-checking cracks.

• Increase pump rate and check nozzles
• Reduce RPM in hard rock to limit heat
• Maintain adequate WOB to ensure cutting
• Use deep-leached thermally stable cutters

Stuck bit prevention

Bit balling, pack-off, and differential sticking.

• Maintain adequate flow and use high-vis sweeps
• If torque rises and ROP drops, stop and circulate off bottom
• Use anti-balling bit designs with hydrophobic coatings
• Regular back-reaming and hole conditioning