Bottom Hole Assembly (BHA)

Bottom Hole Assembly (BHA) – Sales & Lease

High-Performance Bottom Hole Assemblies (BHA) for Directional, Horizontal, Vertical, and Offshore Drilling Operations

Driscoil Equipment Limited supplies premium **Bottom Hole Assemblies (BHAs)** for **sale and lease**, engineered to deliver superior drilling performance, directional control, weight transfer, and wellbore stability in onshore, offshore, deepwater, and HPHT drilling operations. Our BHA systems are designed to optimize rate of penetration (ROP), improve well trajectory accuracy, reduce vibration, and extend drilling tool life under the most demanding drilling environments.

Each Bottom Hole Assembly is custom-designed according to well profile, formation characteristics, drilling objectives, and client specifications, ensuring maximum operational efficiency and wellbore integrity.

Applications

Our Bottom Hole Assemblies are suitable for:

* Vertical Drilling

* Directional Drilling

* Horizontal Drilling

* Extended Reach Drilling (ERD)

* Offshore Drilling

* Deepwater Drilling

* HPHT Wells

* Exploration Wells

* Development Wells

* Geothermal Drilling

* Managed Pressure Drilling (MPD)

* Underbalanced Drilling (UBD)

* Coal Bed Methane (CBM) Drilling

* Shale Oil & Gas Wells

* Water Well Drilling

* Mining Exploration

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Product Overview

A Bottom Hole Assembly (BHA)** is the lower section of the drill string located immediately above the drill bit. It consists of specialized drilling tools and components that provide drilling weight, directional control, vibration management, hole cleaning, formation evaluation, and downhole data acquisition.

The configuration of a BHA is designed based on formation characteristics, well trajectory, drilling objectives, and operational conditions. Proper BHA design improves drilling efficiency, minimizes tool failures, reduces torque and drag, and enhances wellbore quality.

Typical Bottom Hole Assembly Configuration

A standard BHA may include:

* Drill Bit

* Bit Sub

* Float Sub

* Near-Bit Stabilizer

* Drill Collar

* Spiral Drill Collar

* Non-Magnetic Drill Collar

* Heavy Weight Drill Pipe (HWDP)

* Roller Reamer

* Hole Opener

* Underreamer

* Mud Motor (Positive Displacement Motor)

* Rotary Steerable System (RSS)

* Bent Housing

* Shock Sub

* Vibration Dampener

* Hydraulic Jar

* Mechanical Jar

* Accelerator

* Crossover Sub

* Circulating Sub

* Measurement While Drilling (MWD) Tool

* Logging While Drilling (LWD) Tool

* Gamma Ray Tool

* Inclination Sensor

* Azimuth Sensor

* Mud Pulse Telemetry System

* Pressure While Drilling (PWD) Tool

Technical Specifications

Hole Size Compatibility

* 3⅞ in.

* 4¾ in.

* 5⅞ in.

* 6⅛ in.

* 8½ in.

* 9⅞ in.

* 12¼ in.

* 17½ in.

* 20 in.

* 26 in.

Custom configurations available upon request.

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Drill Collar Sizes

* 3⅛ in.

* 4¾ in.

* 6½ in.

* 8 in.

* 9½ in.

* 11 in.

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## Connection Types

* API Regular (REG)

* API Internal Flush (IF)

* API Full Hole (FH)

* NC26

* NC31

* NC38

* NC46

* NC50

* NC56

* 6⅝ REG

* Premium Connections (available on request)

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Working Pressure

* Up to 20,000 psi (depending on tool configuration)

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## Torque Capacity

* Up to 100,000 ft-lbf (model dependent)

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Operating Temperature

* Standard Service:

* -20°C to +175°C

* HPHT Service:

* Up to 205°C (400°F)

Materials of Construction

* AISI 4145H Modified Alloy Steel

* AISI 4140 Alloy Steel

* Non-Magnetic Stainless Steel

* Inconel Components

* Tungsten Carbide Hardfacing

* Wear-Resistant Alloy Materials

* NACE MR0175 Compliant Materials for Sour Service

Performance Features

* Optimized Weight Transfer to Bit

* Improved Rate of Penetration (ROP)

* Enhanced Directional Control

* Reduced Torque and Drag

* Minimized Stick-Slip

* Reduced Bit Whirl

* Lower Lateral Vibrations

* Improved Hole Cleaning

* Superior Wellbore Quality

* Increased Bit Life

* Reduced Non-Productive Time (NPT)

* High Reliability in HPHT Environments

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# Compatible Drill Bits

Our BHAs are compatible with:

* PDC Drill Bits

* Tricone Roller Cone Bits

* Diamond Impregnated Bits

* Natural Diamond Bits

* Hybrid Drill Bits

* Core Bits

* Hole Openers

Downhole Measurement Systems

Optional integration with:

* Measurement While Drilling (MWD)

* Logging While Drilling (LWD)

* Pressure While Drilling (PWD)

* Gamma Ray Logging

* Resistivity Logging

* Neutron Density Logging

* Sonic Logging

* Formation Pressure Testing

* Rotary Steerable Systems (RSS)

Industry Standards

Our Bottom Hole Assemblies are designed and manufactured in accordance with applicable international standards, including:

* API Specification 7-1 – Rotary Drill Stem Elements

* API Specification 5DP – Drill Pipe

* API Specification Q1 – Quality Management Systems

* API RP 7G – Drill Stem Design

* API RP 13B – Drilling Fluids

* ISO 10424 – Rotary Drilling Equipment

* ISO 11961 – Steel Drill Pipe

* NACE MR0175 / ISO 15156 – Sour Service

* ISO 9001 – Quality Management Systems

Inspection & Testing

All Bottom Hole Assembly components are available for inspection prior to sale or lease.

Inspection services include:

* Visual Inspection

* Dimensional Inspection

* Magnetic Particle Inspection (MPI)

* Ultrasonic Testing (UT)

* Dye Penetrant Inspection (DPI)

* Hardness Testing

* Connection Gauge Inspection

* Thread Inspection

* Drift Test

* Straightness Verification

* Pressure Testing (where applicable)

* Material Certification Review

* Factory Acceptance Test (FAT)

Inspection fees are determined based on equipment location, equipment value, inspection scope, and logistics requirements.

Optional Accessories

* Drill Bits

* Mud Motors

* Rotary Steerable Systems (RSS)

* MWD/LWD Tools

* Drill Jars

* Shock Subs

* Stabilizers

* Roller Reamers

* Hole Openers

* Underreamers

* Heavy Weight Drill Pipe (HWDP)

* Drill Collars

* Crossovers

* Circulating Subs

* Fishing Tools

* BHA Handling Tools

* Thread Protectors

* Lifting Subs

Available Brands

Subject to availability:

* Baker Hughes

* Schlumberger

* Halliburton

* NOV (National Oilwell Varco)

* Weatherford

* Drill King International

* Hunting Energy Services

* Varel Energy Solutions

* ReedHycalog

* Ulterra Drilling Technologies

* Cougar Drilling Solutions

* APS Technology

* Drilformance

* Scientific Drilling

* Forum Energy Technologies

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Why Choose Driscoil Equipment Limited?

Driscoil Equipment Limited provides complete Bottom Hole Assembly solutions for the oil and gas, geothermal, mining, and directional drilling industries. We supply high-quality BHA components sourced from trusted global manufacturers, supported by equipment sourcing, technical evaluation, inspection coordination, logistics management, and flexible sales and leasing options.

Whether you require a conventional, directional, or high-performance BHA for complex drilling operations, our engineering team delivers reliable solutions designed to maximize drilling efficiency, reduce operational risks, and improve overall well productivity while meeting the highest international industry standards.