Borehole Enlargement Tool

Borehole Enlargement Tool

A Borehole Enlargement Tool, commonly referred to as a Hole Opener, Underreamer, or Reamer, is a downhole drilling tool designed to enlarge the diameter of an existing pilot hole or wellbore. It is widely used in oil and gas drilling, geothermal, mining, and horizontal directional drilling (HDD) operations to achieve the required borehole size for casing installation, liner running, and well completion.

These tools improve drilling efficiency by creating a smooth, uniform wellbore while minimizing torque, vibration, and drag. Borehole enlargement tools are engineered with high-strength alloy steel bodies and tungsten carbide or polycrystalline diamond compact (PDC) cutters to withstand demanding drilling environments.

Features

Enlarges pilot holes to the desired bore diameter.

Heavy-duty alloy steel body construction.

Tungsten carbide or PDC cutting structures for extended durability.

Hydraulic activation options for underreaming applications.

Optimized cutter placement for efficient rock removal.

High resistance to wear, abrasion, and impact.

Suitable for vertical, directional, and horizontal wells.

Reduces torque and drilling vibrations.

Compatible with standard drilling assemblies.

Designed for extended service life in abrasive formations.

Technical Specifications

Specification Details

Product Type Borehole Enlargement Tool

Standard API Spec 7-1

Material AISI 4145H Modified Alloy Steel

Cutter Type Tungsten Carbide Inserts (TCI) or PDC Cutters

Connection API Regular, IF, FH, NC Threads

Hole Size Range 6" – 36" (Model Dependent)

Pilot Hole Size 4¾" – 26"

Operating Pressure Up to 20,000 psi

Temperature Rating Up to 400°F (204°C)

Rotation Rotary Drilling

Service Standard & Sour Service (NACE MR0175)

Types of Borehole Enlargement Tools

Hole Opener

Underreamer

Fixed Blade Reamer

Roller Cone Hole Opener

PDC Hole Opener

Bi-Center Reamer

String Reamer

Near-Bit Reamer

Fly Cutter

Stabilizing Reamer

Applications

Borehole enlargement tools are used for:

Enlarging pilot holes.

Casing and liner running operations.

Wellbore conditioning.

Horizontal directional drilling (HDD).

Offshore drilling.

Onshore drilling.

Geothermal drilling.

Mining and exploration drilling.

Deepwater drilling.

Extended reach drilling (ERD).

Plug and abandonment (P&A) operations.

Directional drilling projects.

Compatible Equipment

Drill Pipe

Bottom Hole Assembly (BHA)

Drill Collars

Stabilizers

Mud Motors

Rotary Steerable Systems (RSS)

Drill Bits

Drilling Jars

Shock Subs

Measurement While Drilling (MWD)

Logging While Drilling (LWD)

Advantages

Produces a smooth and uniform wellbore.

Improves casing and liner installation.

Increases drilling efficiency.

Reduces drilling torque and drag.

Enhances hole cleaning performance.

Extends drill bit service life.

Suitable for hard and abrasive formations.

Reduces non-productive time (NPT).

Improves overall wellbore stability.

Delivers reliable performance in challenging drilling conditions.

Available Sizes

6"

8½"

9⅞"

12¼"

14¾"

17½"

20"

24"

26"

30"

36"

(Custom sizes and cutter configurations are available upon request.)

Industries Served

Oil & Gas Exploration

Offshore Drilling

Onshore Drilling

Geothermal Energy

Mining and Mineral Exploration

Horizontal Directional Drilling (HDD)

Civil Engineering

Water Well Drilling

Pipeline Construction

Energy Service Companies

Borehole Enlargement Tool Sales & Lease

We supply high-performance Borehole Enlargement Tools for both sale and rental, providing reliable solutions for drilling contractors, oilfield service companies, geothermal operators, and infrastructure projects. All equipment is inspected, refurbished where applicable, and tested to ensure dependable performance and compliance with API standards.

Whether you require a Hole Opener, Underreamer, Fixed Blade Reamer, or Roller Cone Reamer, we offer flexible sales and leasing options to support short-term drilling campaigns and long-term development projects.

Our Sales & Rental Services Include

New and refurbished borehole enlargement tools.

Short-term and long-term rental packages.

Fixed blade, roller cone, and PDC hole openers.

Hydraulic and mechanical underreamers.

API inspection and certification.

Function and quality testing.

Equipment mobilization and demobilization.

Technical consultation and tool selection.

Emergency equipment supply.

Maintenance and refurbishment services.

Nationwide and international delivery.

Our Borehole Enlargement Tools are engineered for maximum drilling efficiency, superior durability, and reliable borehole enlargement, helping operators achieve accurate wellbore diameters, improve casing installation, and reduce drilling time in demanding onshore and offshore environments.