Schlumberger

Directional PDC Drill Bits

L Feature
Low Exposure
(MDOC - Managed Depth of Cut)

 L Feature
Feature:

Cutter backing raised to minimize excessive depth of cut because of formation heterogeneity.

Advantage: Reduces cutter loading; minimize torque in transitional drilling.
Benefit: Minimizes cutter breakage and extends bit life.

M Feature
Replaceable Lo-Vibe Inserts

M Feature
Feature: Lo-Vibe depth of cut control inserts that can be replaced when needed (wear, breakage, etc.).
Advantage: Limits excessive depth of cut and helps reduce torsional vibration.
Benefit: Superior ROP and bit life.

V Feature
Lo-Vibe Option

V Feature

Feature: Lo-Vibe depth of cut control insert.
Advantage: In applications in which bit whirl is a problem, the Lo-Vibe option improves bit stability and reduces potential for damage to the cutting structure by restricting lateral movement and reducing the effects of axial impacts.
Benefit: Optimized ROP and bit life. Long drilling intervals without need for tripping.

Z Feature
TSP Diamonds on Leading Edge

Z Feature

Feature: Thermally stable polycrystalline (TSP) diamonds are placed on the leading edge of each blade.
Advantage: Enhances durability in specific locations on the bit profile.
Benefit: Increases wear resistance, ensures full-gauge hole, and extends bit life.

K Feature
Impregnated Cutter Backing

K Feature
Feature: Diamonds impregnated in the matrix behind the PDC cutters.
Advantage: Limits the progress of PDC cutter wear.
Benefit: Increased footage drilled in abrasive applications.

H Feature
Anti-balling

H Feature
Feature: Higher number of nozzles than standard.
Advantage: Increased cleaning, cooling, and cuttings evacuation with available hydraulic flows; higher flow rates with minimal increase in pump pressure, and reduced risk of bit balling.
Benefit: Superior ROP and bit life; longer drilling intervals without the need for tripping.

N Feature
Fewer Nozzles than Standard

N Feature
Feature: Lower than standard nozzle count.
Advantage: Reduced nozzle count to best match drilling, formation, and hydraulic system capabilities; reduces the flow rate required to achieve an appropriate hydraulic horsepower per square inch (HSI); avoids the use of numerous, smaller nozzles that can become plugged.
Benefit: Superior ROP and bit life; longer drilling intervals without the need for tripping.

Y Feature
30-Series Nozzles

Y Feature

Feature: Contains 30-series nozzles.
Advantage: Allows more freedom in cutting structure design, particularly for smaller bits with limited areas for placement of larger nozzles.
Benefit: High efficiency for cleaning, cooling, and cuttings evacuation without compromising the cutting structure, which could reduce ROP or bit life.

W Feature
40-Series Nozzles

W Feature

Feature: Contains 40-series nozzles.
Advantage: Increased thread size for resistance to wear and erosion.
Benefit: Reduced pop-up force when tightening the nozzle.

U Feature
50-Series Nozzles

U Feature

Feature: Contains 50-series nozzles.
Advantage: Maximum adjustable total flow area (TFA) for smaller or heavier-set designs.
Benefit: High efficiency for cleaning, cooling, and cuttings evacuation without compromising the cutting structure, which could reduce ROP or bit life.

Q Feature
Fixed Ports

Q Feature
Feature: Incorporates fixed ports.
Advantage: Optimizes hydraulics in applications where the use of nozzles compromises the bit design because of space limitations or other similar reason; provides additional cleaning of the cutting structure.
Benefit: Improved ROP and bit life.

R Feature
Restrictor Plate in the Pin


R Feature
Feature: Nozzle fitted in the pin of the bit in high-pressure-drop applications.
Advantage: Splits the pressure drop between the nozzle in the pin and the nozzles on the bit face.
Benefit: Allows installation of larger nozzles in the bit, reducing nozzle velocity and bit body erosion, extending bit life.

E Feature
Extended Gauge Length

E Feature
Feature: Longer gauge than standard.
Advantage: Enhances bit stability and allows more area for gauge
protection components.
Benefit: Improved hole quality.

S Feature
Short Gauge Length


S Feature

Feature: Short gauge length.
Advantage: Reduced bit height improves bit steerability for directional and horizontal applications. It also reduces slide time and footage by achieving builds and turns more quickly.
Benefit: Lower cost per foot, higher overall ROP.

A Feature
Active Gauge


A Feature

Feature: Active gauge.
Advantage: More aggressive side-cutting.
Benefit: Useful for openhole sidetrack applications.

B Feature
Backreaming Cutters


B Feature

Feature: Backreaming cutters.
Advantage: Strategic placement of cutters on the upside of each blade, to allow backreaming in tight spots, reduces the potential of “bit sticking” while pulling out of the hole.
Benefit: Allows a degree of backreaming, sufficient to condition a borehole without major risk of gauge pad wear.

PX Feature
Diamond-Enhanced Gauge Protection


PX Feature

Feature: Diamond-enhanced gauge protection.
Advantage: Thermally stable polycrystalline (TSP) diamonds provide extra protection to the gauge.
Benefit: In-gauge hole and longer bit life; longer drilling intervals without the need for tripping.

T Feature
Turbine Sleeve

 


T Feature

Feature: Turbine sleeve.
Advantage: Reduces vibration and hole spiraling in turbine applications; sleeve lengths can be varied to best match a specific application.
Benefit: Improved ROP and bit life; long drilling intervals without the need for tripping.

PXX Feature
Full Diamond Gauge Pad on Turbine Sleeve


PXX Feature

Feature: Full diamond gauge pad on turbine sleeve.
Advantage: Diamond-enhanced inserts to provide the greatest possible gauge protection in highly abrasive formations and underbalanced drilling.
Benefit: In-gauge hole and long gauge life in extreme drilling environments; longer drilling intervals without the need for tripping.

D Feature
DOG Drilling on Gauge Sleeve


D Feature

Feature: DOG drilling on gauge sleeve.
Advantage: Reduces hole spiraling.
Benefit: Enhances BHA stability and helps maintain an ingauge wellbore.

C Feature
Connection Not API Standard


C Feature

Feature: Nonstandard bit connection.
Advantage: Allows nonstandard box connection for a given bit size, to minimize the length between the bit box and the turbine or motor pin.
Benefit: Provides stabilization, reduces hole spiraling, and provides additional gauge protection.

I Feature
IF Connection


I Feature

Feature: IF connection replaces the standard connection.
Advantage: Allows the bit to conform to the connection type of directional tools.
Benefit: Provides more flexibility in configuring a drilling assembly.

Integrated BHA Drills Sidetrack in One Run

Horizontal sidetrack well, each section drilled in one run.
The integrated BHA drilled a 8 1/2-in section in one run for an average ROP of 56.8 m/h offshore Thailand. 
Read case study 

Nomenclature

Directional PDC Drill Bits Nomenclature
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