Wireline Core Drill Bits & Diamond Reaming Shells - D...

Wireline Core Drill Bits & Diamond Reaming Shells

roduct Range: Diamond Core Bits / PDC Core Bits / Reaming Shells
Sizes: BQ / NQ / HQ / PQ / NTW / HTW / 101
Utilisation : Geological Exploration / Rock Sampling / Mineral Exploration
Formation : Soft to Hard Rock
Customization: Matrix / Cutter / Crown / Diameter / Connection

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Description

System Overview

Complete Wireline Core Drilling System

A complete wireline core drilling system covering hot-pressed diamond core bits, PDC wireline core bits and matching diamond reaming shells. Available in BQ, NQ, HQ, PQ, NTW, HTW, 101 and customized core drilling sizes for geological exploration, mineral exploration and deep core drilling.

Series 01

Hot-Pressed Diamond Wireline Core Bits

For continuous core drilling in abrasive and variable formations.

Series 02

PDC Wireline Core Bits

For fast penetration in suitable soft-to-medium and selected medium-hard formations.

Series 03

Diamond Reaming Shells

Installed behind the core bit to maintain borehole diameter and drilling stability.

Key Features

One system, three product series

Five design advantages behind the complete wireline core drilling system.

01 / 05

Complete Wireline Product Range

BQ, NQ, HQ, PQ, NTW, HTW and customized core drilling sizes are available.

02 / 05

Diamond & PDC Cutting Options

Choose hot-pressed diamond matrix or PDC cutter structures according to formation conditions.

03 / 05

Matching Reaming Shells

Reaming shells are available for standard wireline core drilling systems.

04 / 05

Formation-Specific Configuration

Matrix hardness, cutter design and waterway structure can be adjusted according to rock conditions.

05 / 05

OEM Manufacturing

Custom size, connection, crown profile, cutter configuration and product marking are available.

Applications

Used across exploration, mineral and geotechnical projects

The wireline core drilling system is suitable for geological exploration, mineral exploration and rock core sampling. Other applications include deep core drilling, geotechnical investigation, hydrological exploration and engineering geological drilling.

Exploration géologique

Continuous rock cores for geological surveys and subsurface research.

Mineral Exploration

Reliable core samples for mineral resource evaluation and drilling programs.

Rock Core Sampling

Preserving rock core structure for accurate laboratory analysis.

Three Product Series

Complete system for wireline core drilling

Each series is designed for a specific role in the wireline core drilling system — from cutting to borehole stabilization.

Series 01

Hot-Pressed Diamond Wireline Core Bits

Designed for continuous core drilling in geological exploration and mineral exploration. The hot-pressed diamond matrix provides good wear resistance and stable cutting performance.

Different matrix hardness grades can be selected according to rock hardness and abrasiveness.

Available Sizes

BQ
NQ
NQ3
HQ
HQ3
PQ
PQ3
NTW
HTW
101

Series 02

PDC Wireline Core Bits

PDC wireline core bits use polycrystalline diamond compact cutters and are suitable for formations where efficient shearing action and fast penetration are required.

Commonly used in geological exploration and rock sampling in suitable soft-to-medium and selected medium-hard formations.

Available Sizes

BQ
NQ
HQ
PQ

Series 03

Diamond Reaming Shells

Diamond reaming shells are installed behind the core bit. Their main functions are to:

	Maintain the correct borehole diameter
	Provide clearance for the core barrel
	Help stabilize the drilling string
	Reduce borehole deviation
	Allow replacement core bits to pass smoothly

Wireline Core Bit Sizes

Standard wireline core bit dimensions

Available for hot-pressed diamond and PDC wireline core bits.

Model	Inside Diameter	Outside Diameter
BQ	36.4 mm	59.6 mm
NQ	47.6 mm	75.3 mm
NQ3	45.1 mm	75.3 mm
HQ	63.5 mm	95.6 mm
HQ3	61.1 mm	95.6 mm
PQ	85 mm	122 mm
PQ3	83.1 mm	122 mm
NTW	56 mm	75.5 mm
HTW	71 mm	95.5 mm
101	83 mm	101 mm

Diamond Reaming Shell Sizes

Matching reaming shells for standard models

Reaming shell outside diameters are slightly larger than the corresponding core bit to maintain borehole gauge.

Model	Reaming Shell OD
BQ	60 mm
NQ	75.7 mm
HQ	96.1 mm
PQ	122.5 mm
NTW	77 mm
HTW	97 mm
101	101.5 mm

Diamond or PDC

Which core bit should you choose?

Hot-pressed diamond and PDC core bits are designed for different drilling conditions. Final bit selection should be based on rock hardness, abrasiveness, fracture conditions, drilling depth and drilling parameters.

Hot-Pressed Diamond

Hot-Pressed Diamond Core Bit

Suitable when:

—	Drilling abrasive formations
—	Long bit life is important
—	Continuous core drilling is required
—	Formation hardness varies

PDC

PDC Wireline Core Bit

Suitable when:

—	Fast penetration is required
—	Formation is suitable for shearing-type cutting
—	Lower-to-medium abrasiveness conditions
—	Efficient drilling and cutter durability required

⚠️ Note: Final bit selection should be based on rock hardness, abrasiveness, fracture conditions, drilling depth and drilling parameters.

Matrix Selection

Matrix selection for hot-pressed diamond core bits

The matrix hardness should be selected according to rock hardness and abrasiveness.

Soft Matrix

For Harder Formations

Recommended for harder formations where faster diamond exposure is required.

Medium Matrix

For General Drilling

Suitable for general exploration drilling and mixed formations.

Hard Matrix

For Softer or Abrasive

Recommended for softer or more abrasive formations where slower matrix wear is desirable.

Reaming Shell Advantages

Why use a diamond reaming shell?

Reaming shells are a key part of the wireline core drilling system. They help maintain borehole quality and protect downstream equipment.

Maintain Borehole Diameter Keeps the drilled hole at the required gauge.	Improve Drilling Stability Helps stabilize the core barrel and drilling assembly.
Reduce Hole Deviation Supports straighter drilling during deep exploration.	Protect Core Drilling Equipment Maintaining proper hole clearance helps reduce unnecessary friction around the core barrel.

How to Select

How to select the right wireline core drilling tools

To recommend a suitable configuration, please provide the following information. Our engineers will respond with a factory quotation within 24 hours.

01 Core Drilling System BQ / NQ / HQ / PQ / NTW / HTW / Other	02 Rock Formation For example: limestone, granite, shale, sandstone or fractured rock.	03 Hardness & Abrasiveness Formation hardness and abrasiveness level.
04 Drilling Depth Planned drilling depth and depth range.	05 Core Bit Type Required Hot-Pressed Diamond / PDC	06 Reaming Shell Required Reaming shell required or not.

Customized Solutions

Customized wireline core drilling solutions

We can customize the following items according to your drilling project requirements.

Core Bit Size	Inside / Outside Diameter	Matrix Hardness	Diamond Concentration
PDC Cutter Type	Cutter Quantity	Crown Profile	Waterway Design
Reaming Shell Diameter	Thread Connection	OEM Marking	Packaging

About Chenghui Drilling

Professional drilling tools manufacturer in China

Chenghui Drilling Co., Ltd. specializes in the design, production and supply of PDC drill bits, tricone drill bits, DTH drilling tools and related drilling equipment for customers worldwide.

Every drill bit is manufactured and inspected in our own factory, ensuring stable quality, competitive pricing and reliable delivery for international drilling contractors and distributors.

Supply Mode Factory Direct	Fabrication In-House
Service OEM / ODM	Market Global Export

Chenghui Drilling Tools production workshop

Get In Touch

Need a complete wireline core drilling system?

Share your drilling requirements with our engineers. We will recommend a suitable combination of hot-pressed diamond core bits, PDC wireline core bits and diamond reaming shells, and provide a factory quotation within 24 hours.

1. Core Drilling System	2. Rock Formation
3. Bit Type (Diamond / PDC)	4. Reaming Shell Required

📩 Request Quote
Contact Engineer

FAQ

1
What is a Hot-Pressed Diamond Core Bit?
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A hot-pressed diamond core bit is designed for geological exploration and rock sampling. Diamond particles are bonded into a metal matrix to provide stable cutting performance, good wear resistance and reliable core recovery.

2
What sizes are available?
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Common models include BQ, NQ, NQ3, HQ, HQ3, PQ, PQ3, NTW and HTW. Different sizes can be supplied according to the core drilling system and project requirements.

3
What rock formations are suitable?
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Hot-pressed diamond core bits can be used in soft, medium and hard formations, depending on matrix hardness and crown design. Typical formations include sandstone, limestone, dolomite, shale, marble, gneiss and granite.

4
How do I choose the correct matrix hardness?
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Matrix hardness should be selected according to rock hardness and abrasiveness. Soft, medium and hard matrix options are available for different drilling conditions. If you provide the rock formation and drilling depth, we can recommend a suitable configuration.

5
Can you customize Hot-Pressed Diamond Core Bits?
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Yes. We can customize size, matrix hardness, crown profile, waterway design, bottom-discharge structure, thread connection, product marking and packaging according to your drilling requirements.