Three-Point Roller Reamers for Hole Conditioning and BHA Stabilization

Description

Goldenman Roller Reamers are bottom-hole-assembly tools designed to maintain full hole gauge, remove ledges and micro-doglegs, condition irregular wellbores and stabilize the drill string while drilling through abrasive formations.

Three replaceable roller cutters are positioned around the tool body at approximately equal circumferential spacing. As the drill string rotates, the cutters roll independently against the borehole wall.

The rolling contact provides active reaming while generating less sliding friction than a conventional fixed-blade stabilizer.

The Goldenman standard published range covers:

• 5-7/8 in Roller Reamer
• 6 in Roller Reamer
• 8-1/2 in Roller Reamer
• 12-1/4 in Roller Reamer
• 17-1/2 in Roller Reamer
• 22 in Roller Reamer
• 24 in Roller Reamer
• 26 in Roller Reamer
• 28 in Roller Reamer
• Near-Bit Roller Reamer configurations
• String Roller Reamer configurations
• Type T sharp-tooth rollers
• Type F flat-tooth rollers
• Type B tungsten-carbide-button rollers
• NC and API Regular rotary-shouldered connections
• Replaceable cutter, axle and block assemblies
• Standard and high-abrasion drilling packages

Each tool is configured according to the nominal hole size, minimum restriction, bit diameter, BHA position, formation type, abrasiveness, rotary speed, drilling-fluid system and required connection.

Product Short Description

Goldenman Three-Point Roller Reamers combine active hole conditioning with BHA stabilization.

Unlike a fixed-blade stabilizer, the reamer uses independently rotating cutters that roll against the formation. This reduces sliding contact while cutting high spots, ledges and under-gauge sections from the wellbore wall.

Three cutter options are available:

• Type T: Sharp hardfaced teeth for soft formations
• Type F: Flat hardfaced teeth for medium-hard formations
• Type B: Pressed-in tungsten carbide buttons for hard and abrasive formations

Replaceable cutter blocks allow the same qualified tool body to be configured for different formations and selected hole-size ranges.

Product Highlights

• Three-point roller reamer construction
• Standard hole sizes from 5-7/8 to 28 in
• Custom hole-size configurations
• Near-Bit and String Roller Reamer options
• Active reaming and BHA stabilization
• Maintains full-gauge wellbore diameter
• Removes ledges and localized restrictions
• Conditions micro-doglegs and irregular hole sections
• Reduces sliding contact with the wellbore
• Reduces torque generated by fixed wall contact
• Supports improved weight transfer to the bit
• Helps control stick-slip and lateral vibration
• Supports smoother tripping operations
• Supports easier casing and completion running
• Three equally spaced roller positions
• Field-replaceable cutter assemblies
• Replaceable axles, blocks and retaining components
• Type T cutters for soft formations
• Type F cutters for medium-hard formations
• Type B tungsten carbide cutters for hard formations
• Full-flow central bore
• Large annular bypass area
• High-strength forged alloy-steel body
• Quenched-and-tempered heat treatment
• NC38 and NC50 connection options
• 3-1/2 REG through 7-5/8 REG connections
• Full-body ultrasonic inspection
• Magnetic-particle inspection
• Rotary-connection thread gauging
• Cutter-rotation and retention testing
• Material and heat-number traceability
• Complete cutter and redress kits

General Technical Specifications

Parameter	Available Configuration
Product	Three-Point Roller Reamer
Product category	BHA reaming and stabilization tool
Standard hole-size range	5-7/8–28 in
Custom sizes	Manufactured to approved drawing
Standard cutter quantity	Three
Cutter arrangements	Type T, Type F and Type B
BHA configurations	Near-Bit and String Roller Reamer
Main functions	Reaming, gauge maintenance, stabilization and hole conditioning
Body construction	One-piece forged or machined alloy-steel body
Cutter construction	Replaceable rotating roller assembly
Body material	High-strength quenched-and-tempered alloy steel
Cutter material	Heat-treated alloy steel
Wear protection	Hardfacing or tungsten carbide inserts
Standard connections	NC38, NC50 and API Regular connections
Connection requirements	API Spec 7-2 where applicable
Product requirements	API Spec 7-1 requirements where specified
Internal circulation	Full-flow central bore
Service	Vertical, directional and horizontal drilling
Drilling fluids	WBM, OBM and SBM
Inspection	UT, MPI, dimensional, connection and functional inspection
Supply	Complete tool, replacement cutters and redress kits

Goldenman Published Roller Reamer Specifications

Hole Size	Metric Hole Size	Connection	Fishing Neck OD	Roller Diameter	Roller Length	Overall Length
5-7/8 in	149.2 mm	NC38 or 3-1/2 REG	4-3/4 in / 121 mm	1-13/16 in / 46.2 mm	7-7/8 in / 200 mm	55-1/8 in / 1,400 mm
6 in	152.4 mm	NC38 or 3-1/2 REG	4-3/4 in / 121 mm	2 in / 50.6 mm	7-7/8 in / 200 mm	55-1/8 in / 1,400 mm
8-1/2 in	215.9 mm	NC50 or 4-1/2 REG	6-1/2 in / 165 mm	2-13/16 in / 71 mm	7-7/8 in / 200 mm	68-7/64 in / 1,730 mm
12-1/4 in	311.2 mm	6-5/8 REG	8 in / 203 mm	3-15/16 in / 100 mm	11-13/16 in / 300 mm	74-13/16 in / 1,900 mm
17-1/2 in	444.5 mm	7-5/8 REG	9 in / 229 mm	5-1/2 in / 140 mm	12 in / 304 mm	86-39/64 in / 2,200 mm
22 in	558.8 mm	7-5/8 REG	9-1/2 in / 241.3 mm	6-7/32 in / 158 mm	15-3/4 in / 400 mm	105 in / 2,667 mm
24 in	609.6 mm	7-5/8 REG	9-1/2 in / 241.3 mm	6-7/32 in / 158 mm	15-3/4 in / 400 mm	110-15/64 in / 2,800 mm
26 in	660.4 mm	7-5/8 REG	9-1/2 in / 241.3 mm	7 in / 178 mm	15-3/4 in / 400 mm	118-7/64 in / 3,000 mm
28 in	711.2 mm	7-5/8 REG	9-1/2 in / 241.3 mm	7 in / 178 mm	15-3/4 in / 400 mm	112-7/8 in / 2,867 mm

Final dimensions, connection orientation, body bore, cutter quantity and overall length are manufactured from the approved tool drawing.

What Is a Roller Reamer?

A Roller Reamer is a rotary drill-string tool equipped with freely rotating cutters that contact and condition the wellbore wall.

The tool performs several functions:

• Maintains full hole gauge
• Reams under-gauge intervals
• Removes ledges
• Conditions micro-doglegs
• Smooths irregular wellbore transitions
• Stabilizes the lower BHA
• Reduces sliding friction
• Controls lateral BHA movement
• Supports smoother tripping
• Improves the probability of successfully running casing

The rolling cutters differentiate the tool from a fixed-blade stabilizer, whose blades normally slide against the formation.

Three-Point Roller Arrangement

The standard tool uses three roller assemblies positioned around the circumference of the body.

The three-point layout provides:

• Balanced radial contact
• BHA centralization
• Uniform wellbore conditioning
• Reduced eccentric cutting
• Stable rotation
• Controlled reaction forces
• Open flow paths between cutters
• Efficient removal of reamed formation

Each roller is supported by an axle and bearing arrangement installed inside a replaceable cutter block or body pocket.

Operating Principle

As the drill string rotates:

1. The tool body rotates with the BHA.
2. The roller cutters contact the wellbore wall.
3. Friction between the formation and roller surface causes each roller to rotate.
4. Cutter teeth or carbide buttons break high points from the formation.
5. The three cutters maintain the tool near the center of the hole.
6. Drilling fluid transports the generated cuttings away from the cutting zone.
7. The tool leaves a smoother and more uniform borehole behind the BHA.

Because the rollers rotate rather than continuously slide, the reamer can generate lower wall-contact friction than a fixed-gauge blade tool.

Main Functions

Hole-Gauge Maintenance

A drill bit can become under gauge through:

• Gauge-pad wear
• Abrasive formation
• Cutter damage
• Extended drilling interval
• Thermal wear
• Impact damage
• Poor hole cleaning

The Roller Reamer follows the bit and conditions localized under-gauge sections toward the required nominal diameter.

Ledge Removal

Ledges can develop at:

• Formation transitions
• Changes in rock strength
• Changes in drilling direction
• Sidetrack points
• Build and drop sections
• Casing-shoe exits
• Interbedded formations

The roller cutters remove high-side projections and produce a smoother transition for the following drill string and casing.

Micro-Dogleg Conditioning

A wellbore can contain small, closely spaced directional changes that are not obvious from conventional survey spacing.

These micro-doglegs can increase:

• Drill-string contact
• Torque and drag
• BHA bending
• Connection fatigue
• Casing-running resistance
• Completion-string friction

The Roller Reamer conditions localized high points and improves the effective borehole profile.

BHA Stabilization

The three roller cutters provide radial contact around the BHA.

This supports:

• Reduced lateral movement
• Reduced drill-collar wall contact
• Improved bit stability
• Improved weight transfer
• Reduced lateral vibration
• Reduced borehole spiraling
• More consistent directional response

Torque Reduction

Fixed blades slide continuously against the formation.

Roller cutters rotate at the contact point and reduce the amount of sliding contact.

Lower parasitic torque allows more surface torque to reach:

• The drill bit
• A downhole motor
• A rotary steerable system
• Other active BHA components

Tripping Improvement

A conditioned borehole can reduce the requirement for:

• Backreaming
• Repeated wiper trips
• Working through ledges
• High overpull
• Extended circulation at tight spots

A smooth, full-gauge hole also improves the probability of running casing and completion equipment to planned depth.

Type T Roller Cutter

Type T cutters use milled sharp teeth with wear-resistant hardfacing.

They are designed for soft formations where the cutter must penetrate and remove material efficiently.

Typical applications include:

• Soft shale
• Claystone
• Marl
• Soft limestone
• Chalk
• Unconsolidated sandstone
• Soft sedimentary formations

The sharp tooth profile provides:

• Aggressive formation penetration
• Efficient scraping action
• Good removal of soft ledges
• Effective hole cleaning
• Controlled cutter engagement

Type T cutters are not the preferred choice for highly abrasive or very hard formations because sharp teeth can wear more rapidly.

Type F Roller Cutter

Type F cutters use wider, flatter milled teeth protected by hardfacing.

They are designed for medium and medium-hard formations.

Typical applications include:

• Hard shale
• Firm limestone
• Dolomite
• Anhydrite
• Cemented sandstone
• Interbedded formations
• Moderately abrasive rock

The flat tooth profile provides:

• Increased load-bearing area
• Crushing and rolling action
• Improved tooth durability
• Reduced tooth penetration
• Stable gauge maintenance
• Resistance to impact damage

Type B Roller Cutter

Type B cutters use pressed-in tungsten carbide buttons or inserts.

They are designed for hard and highly abrasive formations.

Typical applications include:

• Abrasive sandstone
• Quartz-rich sandstone
• Chert
• Granite
• Basalt
• Hard dolomite
• Hard limestone
• Quartzite
• Geothermal formations

The tungsten carbide buttons provide:

• High abrasion resistance
• Long gauge retention
• Resistance to tooth wear
• Strong compressive cutting action
• Improved service life in hard rock
• Stable roller diameter during extended runs

Cutter Selection Matrix

Formation Condition	Recommended Cutter	Cutting Structure
Soft and non-abrasive	Type T	Sharp milled hardfaced teeth
Soft to medium	Type T or Type F	Sharp or flat hardfaced teeth
Medium-hard	Type F	Wide flat hardfaced teeth
Hard	Type B	Tungsten carbide buttons
Hard and abrasive	Type B	High-wear tungsten carbide inserts
Interbedded formations	Type F or Type B	Impact-resistant flat teeth or carbide buttons
Unknown mixed formation	Project-specific combination	Selected after drilling-data review

Final cutter selection should consider both compressive strength and abrasiveness.

A soft formation containing abrasive quartz can require a more wear-resistant cutter than its compressive strength alone would suggest.

Replaceable Cutter Assembly

The roller cutter is installed in a replaceable assembly consisting of:

• Roller cutter
• Axle or journal
• Upper axle seat
• Lower axle seat
• Bearings or bearing surfaces
• Thrust components
• Retaining block
• Locking components
• Seals where applicable
• Lubrication components where applicable

The assembly allows worn cutters to be replaced without discarding the complete tool body.

Cutter Block Adjustment

Selected roller-body designs can accept different qualified cutter blocks to cover a defined range of hole sizes.

This provides:

• Reduced body inventory
• Faster conversion between hole sizes
• Formation-specific cutter selection
• Efficient field redressing
• Reduced tool ownership cost
• Simplified spare-parts stocking

The cutter block, roller diameter and body pocket must remain within the approved design combination.

Unapproved block or roller combinations can affect balance, retention and cutting diameter.

Near-Bit Roller Reamer

A Near-Bit Roller Reamer is positioned immediately above or close to the drill bit.

It provides:

• Gauge protection near the bit
• Improved lower-BHA stability
• Reduced bit whirl
• Reduced lateral bit movement
• Improved hole-size consistency
• Rapid removal of ledges close to the bit
• Reduced drill-collar contact
• Improved bit service life

The connection arrangement is selected to match the bit sub, drill collar or motor below the reamer.

String Roller Reamer

A String Roller Reamer is positioned farther above the bit within the BHA.

It can be installed:

• Between Drill Collars
• Above a Downhole Motor
• Above MWD or LWD tools
• Within a packed BHA
• Between Heavy Weight Drill Pipe sections
• At known dogleg or ledge-control positions

String placement provides:

• BHA centralization
• Reduction of drill-collar wall contact
• Conditioning of ledges after the bit passes
• Reduced torque and drag
• Improved weight transfer
• Protection of MWD and LWD components

Near-Bit vs String Roller Reamer

Selection Factor	Near-Bit Reamer	String Reamer
Position	Immediately above or close to bit	Higher in the BHA
Primary function	Bit stabilization and immediate gauge maintenance	String stabilization and hole conditioning
Connection arrangement	Often box-to-pin or bit-sub compatible	Normally matched to Drill Collar connections
Effect on bit behavior	Direct	Indirect
Protection of bit gauge	High	Secondary
Conditioning farther behind bit	Limited by placement	Strong
BHA bending influence	High near bit	Depends on string position

Roller Reamer vs Fixed-Blade Stabilizer

Roller Reamer	Fixed-Blade Stabilizer
Uses rotating cutters	Uses fixed blades
Actively conditions formation	Primarily stabilizes and maintains clearance
Rolling contact reduces sliding friction	Blades slide against the wellbore
Replaceable cutter assemblies	Fixed or replaceable blades
Suitable for abrasive formations	Suitable for broad general drilling
Can remove ledges and high spots	Limited active cutting
Contains moving parts	Simpler solid construction
Requires cutter and bearing maintenance	Requires blade and hardfacing inspection

A Roller Reamer can perform stabilization, but it should not automatically replace every stabilizer position without BHA analysis.

Roller Reamer vs Underreamer

Roller Reamer	Underreamer
Normally maintains or slightly conditions nominal hole gauge	Intentionally enlarges the hole beyond pilot-bit diameter
Cutters remain at fixed working diameter	Cutting arms commonly extend and retract
Used for ledge removal and hole conditioning	Used for engineered borehole enlargement
Installed for continuous BHA conditioning	Activated at selected depth
Limited formation removal	Removes a substantial annular section
Lower enlargement ratio	Defined enlarged-hole diameter

The Goldenman Roller Reamer is primarily a hole-conditioning and gauge-maintenance tool rather than an expandable underreamer.

Roller Reamer vs Hole Opener

A Hole Opener uses roller cones or fixed cutters to enlarge a previously drilled pilot hole substantially.

A Roller Reamer:

• Maintains the selected hole diameter
• Conditions localized under-gauge areas
• Removes ledges
• Stabilizes the BHA
• Removes a smaller volume of formation

These products should not share the same primary product page or keyword positioning.

Roller Reamer vs Reamer Shoe

A Roller Reamer is installed in the drilling BHA and operates while drilling or conditioning the open hole.

A Reamer Shoe is installed at the bottom of a casing or liner string and helps the casing pass through restrictions.

The two products serve different operational stages.

Vertical-Well Applications

In vertical wells, a Roller Reamer helps:

• Maintain full gauge
• Control drill-collar movement
• Reduce borehole spiraling
• Remove formation ledges
• Support smooth tripping
• Protect the bit gauge

The three-point design provides balanced radial contact around the borehole.

Directional-Well Applications

Directional wells introduce increased side force and BHA contact.

The Roller Reamer supports:

• Dogleg conditioning
• Reduced low-side friction
• Improved weight transfer
• Reduced BHA vibration
• Controlled toolface response
• Reduced ledge formation
• Improved borehole quality

Tool placement must be reviewed to avoid undesirable effects on build, hold or drop tendency.

Horizontal-Well Applications

Horizontal sections can develop:

• Cuttings beds
• Low-side ledges
• High drag
• BHA contact
• Torsional vibration
• Poor weight transfer
• Borehole spiraling

A String Roller Reamer can help agitate low-side cuttings and condition the borehole while reducing fixed-wall contact.

The hydraulic program must still provide sufficient annular velocity to transport loosened material.

Extended-Reach Applications

Extended-reach wells create high cumulative friction over long inclined and horizontal intervals.

A correctly positioned Roller Reamer can support:

• Reduced parasitic torque
• Improved transfer of weight to the bit
• Reduced stick-slip
• Reduced drill-collar wear
• Fewer tight spots
• Easier tripping
• Improved casing-running probability

Placement should be evaluated together with torque-and-drag, BHA stress and contact-force analysis.

Abrasive-Formation Applications

The Roller Reamer is particularly useful where abrasive formations rapidly wear:

• Bit gauge pads
• Fixed stabilizer hardfacing
• Drill Collar OD
• Tool joints
• BHA wear pads

Type B tungsten carbide cutters are selected where long-term gauge retention is the primary requirement.

Interbedded-Formation Applications

Hard and soft layers can create ledges because the bit penetrates each formation differently.

A Roller Reamer can smooth the transitions between:

• Shale and limestone
• Sandstone and shale
• Salt and anhydrite
• Limestone and dolomite
• Soft and hard stringers

Type F or Type B cutters are commonly selected according to impact loading and abrasiveness.

Hole-Gauge Selection

The working OD is selected from:

• Nominal bit diameter
• Required finished-hole diameter
• Bit gauge condition
• Expected hole enlargement
• Casing OD
• Casing coupling OD
• Minimum restriction
• Wellbore stability
• Directional requirements
• Formation abrasiveness

The tool should provide the required hole conditioning without creating excessive enlargement or BHA contact.

Under-Gauge and Over-Gauge Cutters

Selected designs can use:

• Full-gauge cutters
• Slightly under-gauge cutters
• Slightly over-gauge cutters
• Reamer-stabilizer cutter combinations
• Backreaming cutter profiles

These configurations are engineered for the specific body and application.

An over-gauge cutter should not be installed without reviewing:

• Casing clearance
• Formation stability
• BHA bending
• Hole enlargement tolerance
• Cementing requirements
• Torque and hydraulic effects

Body Construction

The main body provides:

• Axial-load capacity
• Torsional-load capacity
• Bending resistance
• Internal drilling-fluid passage
• Cutter-pocket support
• Fishing-neck profile
• Top and bottom connections
• Load transfer between BHA components

The body is machined from high-strength alloy steel and receives controlled quenching and tempering.

Body Materials

Available body materials can include:

• AISI 4145H Modified
• AISI 4330
• Equivalent high-strength alloy steel
• Controlled-hardness sour-service alloy
• Non-magnetic material for selected configurations

The material is selected for:

• Torsional strength
• Tensile strength
• Impact toughness
• Fatigue resistance
• Heat-treatment response
• Temperature
• H₂S exposure
• BHA position

Roller Materials

Roller bodies are manufactured from heat-treated alloy steel.

The material provides:

• Compressive strength
• Tooth support
• Impact resistance
• Wear resistance
• Fatigue resistance
• Stable hardfacing retention
• Stable carbide-button retention

Type T and Type F roller teeth receive wear-resistant hardfacing.

Type B rollers use mechanically retained tungsten carbide inserts.

Axle and Bearing System

The axle system carries radial, axial and impact loads from the roller.

Depending on the tool configuration, the assembly can include:

• Hardened axle
• Journal bearing
• Roller bearing
• Thrust washer
• Bushings
• Mechanical seal
• Pressure compensation
• Lubrication reservoir
• Open mud-lubricated bearing
• Sealed-bearing cartridge

The final bearing system is identified in the approved cutter assembly drawing.

Open-Bearing Configuration

An open or drilling-fluid-lubricated bearing system provides:

• Simple construction
• Easy field inspection
• Straightforward cleaning
• Reduced seal dependence
• Efficient redressing

It requires controlled inspection for:

• Abrasive wear
• Axle scoring
• Solids packing
• Bearing clearance
• Erosion

Sealed-Bearing Configuration

A sealed-bearing roller can provide:

• Isolation from abrasive drilling solids
• Controlled internal lubrication
• Extended bearing life
• Stable high-speed operation
• Reduced axle and journal wear

The seal and pressure-compensation system must be matched to:

• Downhole pressure
• Temperature
• Rotary speed
• Mud chemistry
• Solids content
• Planned run duration

Cutter Retention

The cutter-retention system can use:

• Mechanical wedge blocks
• Axle-seat blocks
• Locking plates
• Retaining pins
• Retaining screws
• Safety locking components

Retention components must prevent the cutter assembly from leaving the tool body during:

• Rotation
• Reaming
• Backreaming
• Tripping
• Vibration
• Impact loading

Every cutter block is inspected for full seating and mechanical locking before running.

Fishing Neck

The Fishing Neck provides a defined external diameter for fishing and handling.

It also supports:

• Tool handling
• BHA dimensional control
• External fishing-tool engagement
• Transition between connections and cutter section
• Clearance calculation

The fishing-neck OD must pass through all known restrictions above the operating interval.

Internal Flow Bore

The central bore carries drilling fluid to the bit and lower BHA.

A large bore supports:

• Reduced pressure loss
• High circulation rate
• Bit hydraulic power
• MWD and LWD flow requirements
• Passage of selected retrieval equipment
• Reduced erosion velocity

The final bore depends on body size and connection.

Annular Bypass Area

Flow paths between the cutter blocks allow drilling fluid and cuttings to move around the tool.

Adequate annular area reduces:

• Local pressure loss
• Cuttings packing
• ECD increase
• Erosion
• Risk of differential sticking

The tool should be assessed together with the complete BHA and minimum hole clearance.

Drilling-Fluid Compatibility

Roller Reamers are supplied for:

• Water-Based Mud
• Oil-Based Mud
• Synthetic-Based Mud
• High-Salinity Mud
• Weighted Drilling Fluid
• Geothermal Drilling Fluid
• High-Solids Systems

Quotation information should include:

• Mud type
• Mud density
• Solids content
• Chloride concentration
• Oil-water ratio
• Maximum temperature
• Chemical additives
• Lost-circulation materials

These parameters influence the bearing, seal, hardfacing and corrosion-protection selection.

Rotary-Shouldered Connections

Standard published connections include:

• NC38
• NC50
• 3-1/2 REG
• 4-1/2 REG
• 6-5/8 REG
• 7-5/8 REG

Additional connections can be manufactured according to the approved tool design.

Connection inspection covers:

• Thread form
• Taper
• Lead
• Pitch diameter
• Thread height
• Root and crest condition
• Shoulder flatness
• Shoulder perpendicularity
• Pin nose
• Box counterbore
• Gauge standoff
• Surface finish
• Connection concentricity

Box-Up and Pin-Down Configuration

String Roller Reamers are commonly supplied with:

• Box connection at the top
• Pin connection at the bottom

Near-Bit configurations can use a connection arrangement matched to the bit, Bit Sub or Downhole Motor.

The final connection orientation must be specified in the quotation and approved BHA drawing.

Stress-Relief Features

Pin stress-relief grooves and box borebacks are available where required by the connection design.

These features can reduce fatigue concentration near the last engaged thread under:

• Bending
• Torsion
• High axial load
• Repeated vibration
• Directional drilling
• Extended run duration

The effect on pin cross-sectional area and connection capacity is included in the connection design.

API Spec 7-1 Positioning

API Spec 7-1 specifies technical delivery conditions for defined Rotary Drill Stem Elements, including stabilizers.

For Roller Reamers supplied as stabilizer-type drill-stem components, the applicable requirements can cover:

• Materials
• Heat treatment
• Mechanical properties
• Dimensions
• Nondestructive examination
• Workmanship
• Traceability
• Marking
• Documentation

API Spec 7-1 does not independently define:

• Formation-specific roller type
• Cutting rate
• Maximum reaming interval
• Bearing life
• Roller service life
• Guaranteed torque reduction
• Maximum operating RPM
• Hole-conditioning performance

These values are established by the manufacturer’s design, calculations and qualification testing.

API Spec 7-2 Positioning

API Spec 7-2 applies to qualifying NC and REG rotary-shouldered connections used on the Roller Reamer.

It covers:

• Thread dimensions
• Connection dimensions
• Gauges
• Gauging practice
• Inspection methods
• Selected finishing requirements

Connection conformity does not independently certify the complete Roller Reamer, cutter assembly or reaming performance.

BHA Placement Engineering

Roller Reamer placement considers:

• Bit type
• Bit diameter
• BHA stiffness
• Drill Collar OD
• Downhole Motor position
• MWD and LWD position
• Rotary Steerable System position
• Neutral point
• Bending stress
• Contact force
• Well inclination
• Dogleg severity
• Formation transitions
• Known ledges
• Torque-and-drag model

Incorrect placement can change the directional behavior or increase local BHA bending.

Placement Above a PDC Bit

A Roller Reamer above a PDC bit can support:

• Bit gauge protection
• Reduced lateral vibration
• Reduced borehole spiraling
• Improved weight transfer
• Smoother wellbore profile

The cutter structure must not generate excessive reactive torque or interfere with directional response.

Placement Above a Roller-Cone Bit

A Roller Reamer above a Roller-Cone Bit can:

• Maintain gauge after cone wear
• Reduce Drill Collar contact
• Condition interbedded formations
• Support vertical-hole control
• Remove ledges caused by changing formation strength

Placement with a Downhole Motor

When installed near a Downhole Motor, the engineering review should include:

• Motor bend setting
• Sliding and rotating modes
• Stabilizer position
• Bit-to-bend distance
• Bit-to-reamer distance
• Motor housing OD
• Required dogleg severity
• Toolface response

A Roller Reamer can affect the fulcrum or packed behavior of the BHA.

Placement with MWD and LWD Tools

A Roller Reamer can reduce vibration transmitted to MWD and LWD tools.

The placement must still preserve:

• Sensor-spacing requirements
• Magnetic-spacing requirements
• Directional response
• Internal flow area
• Fishing access
• BHA assembly length

Non-magnetic material can be supplied where magnetic interference must be controlled.

Pre-Run Inspection

Before running:

1. Verify the required hole size.
2. Verify the tool serial number.
3. Confirm the cutter type.
4. Confirm Near-Bit or String configuration.
5. Inspect the body for impact or corrosion.
6. Inspect all cutter blocks.
7. Verify that every roller rotates freely.
8. Check axial and radial cutter movement.
9. Inspect the carbide inserts or hardfacing.
10. Inspect the axles and retaining blocks.
11. Verify all locking components.
12. Confirm the internal bore is clear.
13. Inspect the top and bottom connections.
14. Gauge the rotary-shouldered threads.
15. Measure the full working OD.
16. Measure the fishing-neck OD.
17. Confirm the tool can pass all known restrictions.
18. Record the inspection results.

BHA Makeup

1. Clean the pin and box connections.
2. Inspect both sealing shoulders.
3. Apply approved rotary-shouldered thread compound.
4. Align the connected components.
5. Start the connection without cross-threading.
6. Apply the specified makeup torque.
7. Record the tool position in the BHA.
8. Confirm the connection orientation.
9. Verify unrestricted circulation through the assembly.

Running in Hole

The Roller Reamer should be run at controlled speed.

Monitor:

• Hook load
• Overpull
• Drag
• Pump pressure
• Tool depth
• Restriction depths
• Cuttings returns

Do not force the tool through a restriction smaller than its verified working OD.

Drilling Operation

During drilling, monitor:

• Rotary speed
• Surface torque
• Downhole torque
• Weight on bit
• Rate of penetration
• Standpipe pressure
• Vibration
• Stick-slip
• Differential pressure
• Cuttings returns
• Hole-cleaning performance
• Directional response

Abnormal torque or vibration can indicate:

• Roller seizure
• Bearing damage
• Carbide loss
• Broken retention component
• Cuttings packoff
• Formation transition
• Tool-body contact
• Incorrect operating parameters

Reaming and Conditioning Operation

A conditioning program can include:

1. Establish the approved circulation rate.
2. Rotate at the selected speed.
3. Move through the target interval at controlled rate.
4. Monitor torque and drag.
5. Reciprocate across ledges or tight sections.
6. Circulate loosened formation to surface.
7. Repeat the conditioning pass where required.
8. Confirm improved hook-load and torque response.
9. Validate the hole before running casing.

Backreaming

Selected Roller Reamers can condition the hole while the drill string is pulled upward with rotation.

Backreaming should be controlled because excessive upward rate or rotation can produce:

• High cutter impact
• Axial bearing overload
• Cuttings accumulation
• Packoff
• Excessive torque
• Cutter damage

The cutter profile and body must be approved for the planned bidirectional operation.

Operating Limits

Model-specific operating limits can include:

• Maximum rotary speed
• Maximum weight on tool
• Maximum torque
• Maximum overpull
• Maximum bending load
• Maximum temperature
• Maximum flow rate
• Maximum pressure loss
• Maximum cutter revolutions
• Maximum permitted roller clearance

These values are provided on the approved technical datasheet and operation manual.

They should not be assumed from hole size alone.

Roller Wear Inspection

Roller wear is evaluated from:

• Cutter OD
• Tooth height
• Carbide-button height
• Missing inserts
• Flat spots
• Cracks
• Hardfacing loss
• Axial play
• Radial play
• Bearing roughness
• Roller seizure
• Axle wear

The roller should be replaced when wear exceeds the permitted redress limit.

Common Failure Modes

Roller Does Not Rotate Freely

Possible causes include:

• Bearing damage
• Axle scoring
• Solids packed around the roller
• Seal failure
• Bent axle
• Excessive radial load
• Corrosion
• Thermal damage
• Deformed retaining block

Excessive Roller Clearance

Possible causes include:

• Bearing wear
• Axle wear
• Thrust-washer wear
• Cutter-body wear
• Lost retaining components
• Extended abrasive service

Carbide Button Loss

Possible causes include:

• Incorrect interference fit
• Severe impact
• Button fracture
• Roller-body cracking
• Thermal damage
• Repeated hard-formation impact
• Improper repair

Hardfacing Wear

Possible causes include:

• Highly abrasive formation
• Extended run length
• Excessive rotary speed
• Insufficient hardfacing thickness
• Improper hardfacing bond
• Cutter sliding rather than rolling

Cutter Block Loosening

Possible causes include:

• Incorrect assembly
• Damaged wedge
• Loose retaining bolt
• Worn body pocket
• Vibration
• Impact loading
• Incorrect locking component

Tool Becomes Under Gauge

Possible causes include:

• Roller OD wear
• Carbide loss
• Hardfacing loss
• Bearing collapse
• Incorrect cutter block
• Formation abrasion beyond design expectation

Excessive Torque

Possible causes include:

• Roller seizure
• Tool packed with cuttings
• Incorrect working OD
• High side load
• Tool-body wall contact
• Damaged cutter
• Insufficient hole cleaning

Body or Connection Fatigue

Possible causes include:

• Incorrect connection makeup
• High dogleg severity
• Excessive bending
• Torsional vibration
• Stick-slip
• Repeated impact
• Worn connection shoulders
• Unrecorded overload

Post-Run Inspection

After every run:

• Wash and clean the complete tool
• Remove solids from cutter pockets
• Verify free roller rotation
• Measure roller OD
• Measure axial and radial clearance
• Inspect hardfacing
• Inspect carbide inserts
• Inspect axles
• Inspect bearing surfaces
• Inspect retaining blocks
• Inspect body pockets
• Inspect fishing neck
• Inspect the internal bore
• Inspect top and bottom connections
• Perform MPI on critical areas
• Record dull condition
• Replace damaged cutter components
• Apply corrosion protection
• Install thread protectors

Cutter Replacement

A standard cutter replacement procedure includes:

1. Clean the cutter pocket.
2. Remove the mechanical locking components.
3. Remove the retaining block.
4. Remove the axle and worn roller.
5. Inspect the body pocket.
6. Inspect the axle seats.
7. Install the approved replacement assembly.
8. Install the axle and retention system.
9. Verify mechanical locking.
10. Check free roller rotation.
11. Measure axial and radial play.
12. Measure full working OD.
13. Complete a final assembly inspection.

Only matched cutter, axle and block combinations should be installed.

Manufacturing Process

Goldenman Roller Reamer manufacturing includes:

1. Alloy-steel forging verification
2. Heat-number assignment
3. Forging ultrasonic inspection
4. Rough body machining
5. Quenching and tempering
6. Mechanical-property testing
7. Internal-bore machining
8. Fishing-neck machining
9. Cutter-pocket machining
10. Flow-channel machining
11. Top and bottom connection machining
12. Thread gauging
13. Roller blank production
14. Roller heat treatment
15. Tooth machining
16. Hardfacing application
17. Tungsten carbide insertion
18. Axle and bearing-component manufacturing
19. Cutter-block manufacturing
20. Cutter assembly
21. Body and cutter dimensional inspection
22. Cutter-rotation testing
23. Retention inspection
24. Full working-OD measurement
25. Body MPI
26. Final functional inspection
27. Surface coating
28. Permanent marking
29. Documentation review
30. Export packaging

Heat Treatment

The body receives controlled quenching and tempering to develop:

• Yield strength
• Tensile strength
• Impact toughness
• Fatigue resistance
• Torsional capacity
• Stable hardness
• Wear resistance around cutter pockets

Rollers, axles and retention components receive component-specific heat treatment.

Hardfacing Application

Type T and Type F cutter teeth can use:

• Crushed tungsten carbide hardfacing
• Carbide particles in nickel matrix
• Wear-resistant weld overlay
• Project-specific hardfacing systems

Quality control covers:

• Hardfacing coverage
• Deposit thickness
• Bond integrity
• Cracking
• Porosity
• Tooth-profile accuracy
• Final cutter diameter

Tungsten Carbide Insert Installation

Type B rollers use pressed-in tungsten carbide buttons.

Inspection covers:

• Button grade
• Button dimensions
• Hole dimensions
• Interference fit
• Button projection
• Button pattern
• Missing inserts
• Roller-body cracking
• Final roller diameter

Quality Control and Testing

Goldenman quality control includes:

• Raw-material certificate verification
• Chemical-composition testing
• Heat-number traceability
• Heat-treatment monitoring
• Yield-strength testing
• Tensile-strength testing
• Elongation testing
• Impact testing
• Body-hardness inspection
• Roller-hardness inspection
• Axle-hardness inspection
• Full-body ultrasonic inspection
• Body magnetic-particle inspection
• Cutter-component MPI
• Fishing-neck inspection
• Internal-bore inspection
• Cutter-pocket inspection
• Connection-thread inspection
• Shoulder inspection
• Roller-diameter inspection
• Roller-length inspection
• Full-gauge inspection
• Roller-rotation testing
• Axial- and radial-clearance inspection
• Retention-system inspection
• Hardfacing inspection
• Carbide-insert inspection
• Final visual inspection

Full-Gauge Inspection

The complete cutter assembly is measured to confirm the specified working diameter.

Inspection can use:

• Calibrated OD instruments
• Ring-type Go gauge
• Ring-type No-Go gauge
• Coordinate measurement
• Template gauges
• Project-specific inspection fixture

The final inspection record identifies the tool serial number and installed cutter set.

Product Marking

Each tool is permanently marked with:

• Goldenman identification
• Product type
• Nominal hole size
• Near-Bit or String configuration
• Cutter type
• Fishing-neck OD
• Top connection
• Bottom connection
• Heat number
• Serial number
• Manufacturing date

Each replacement cutter set is identified with:

• Cutter type
• Roller diameter
• Compatible body
• Batch number
• Part number

Product Documentation

The documentation package can include:

• Certificate of Conformity
• Product datasheet
• General assembly drawing
• BHA dimensional drawing
• Cutter-block drawing
• Material certificate
• EN 10204 3.1 certificate
• Chemical-composition report
• Heat-treatment record
• Mechanical-property report
• Hardness report
• Impact-test report
• Ultrasonic-test report
• Magnetic-particle-test report
• Thread-gauge inspection report
• Dimensional inspection report
• Full-gauge inspection report
• Cutter-rotation report
• Cutter-clearance report
• Hardfacing inspection report
• Carbide-insert inspection report
• Component traceability list
• Makeup-torque recommendation
• Operating and maintenance manual
• Recommended spare-parts list
• Packing list
• Third-party inspection report

Replacement Parts and Redress Kits

Goldenman supplies:

• Type T Roller Cutters
• Type F Roller Cutters
• Type B TCI Roller Cutters
• Complete Cutter Cartridges
• Cutter Blocks
• Axles
• Upper Axle Seats
• Lower Axle Seats
• Bearings
• Bushings
• Thrust Washers
• Seals
• Lubrication Components
• Wedge Retainers
• Retaining Pins
• Retaining Bolts
• Locking Plates
• Thread Protectors
• Complete Redress Kits

Frequently Asked Questions

What type of tool is shown on this page?

This page covers Three-Point Roller Reamers used for wellbore conditioning, gauge maintenance and BHA stabilization.

What sizes are published?

The Goldenman published parameter table covers:

• 5-7/8 in
• 6 in
• 8-1/2 in
• 12-1/4 in
• 17-1/2 in
• 22 in
• 24 in
• 26 in
• 28 in

Does Goldenman supply 4-5/8-inch Roller Reamers?

Custom smaller sizes can be manufactured from an approved design.

The currently published standard dimensional table starts at 5-7/8 inches.

Why is the product called a Roller Reamer?

The tool uses rotating cutters to ream and condition the wellbore wall as the drill string rotates.

Does it function as a stabilizer?

Yes.

The three equally spaced rollers provide radial BHA support while the tool maintains hole gauge.

What is the difference between a Roller Reamer and a Stabilizer?

A fixed Stabilizer mainly centralizes the BHA.

A Roller Reamer also uses active rotating cutters to remove ledges and under-gauge formation.

What is the difference between a Roller Reamer and an Underreamer?

A Roller Reamer normally maintains or slightly conditions nominal hole gauge.

An Underreamer deliberately enlarges the hole substantially beyond the pilot-bit diameter.

What is a Near-Bit Roller Reamer?

It is installed close to the drill bit to protect bit gauge, stabilize the lower BHA and immediately condition the hole.

What is a String Roller Reamer?

It is installed higher in the BHA to centralize the Drill Collar section, reduce wall contact and condition the borehole.

What cutter types are available?

Goldenman supplies:

• Type T
• Type F
• Type B

Which cutter is used for soft formations?

Type T uses sharp, hardfaced milled teeth for soft formations.

Which cutter is used for medium-hard formations?

Type F uses flat, hardfaced teeth for medium and medium-hard formations.

Which cutter is used for hard abrasive formations?

Type B uses pressed-in tungsten carbide buttons for hard and abrasive formations.

Can the cutter assemblies be replaced?

Yes.

Roller cutters, axles, blocks, bearings and retaining components are available as replacement parts.

Can one body be used for different hole sizes?

Selected body designs can use qualified cutter and block combinations covering a defined range.

Every combination must match the approved body and full-gauge drawing.

What connections are available?

Published connection options include:

• NC38
• NC50
• 3-1/2 REG
• 4-1/2 REG
• 6-5/8 REG
• 7-5/8 REG

Is the complete Roller Reamer API certified?

API Spec 7-1 can apply to defined stabilizer-type drill-stem element requirements.

API Spec 7-2 applies to qualifying NC and REG rotary-shouldered connections.

These standards should not be represented as an automatic performance certification of the complete reaming system unless supported by the applicable license and product scope.

Can the tool be used in horizontal wells?

Yes.

Correctly selected String Roller Reamers can reduce fixed-wall contact, condition ledges and support weight transfer in horizontal intervals.

Can it be used for backreaming?

Selected cutter configurations support bidirectional conditioning.

The cutter profile and operating limits must be approved for the planned backreaming operation.

Can it reduce torque?

The rolling cutter contact reduces sliding friction compared with fixed wall-contact surfaces.

Actual torque reduction depends on BHA placement, side load, hole geometry, formation and operating parameters.

Can a sealed-bearing cutter be supplied?

Sealed-bearing configurations can be supplied for applications requiring extended bearing life in abrasive drilling conditions.

Are non-magnetic configurations available?

Non-magnetic body configurations can be engineered for installation near directional survey and MWD equipment.

How is the working diameter inspected?

The complete tool is measured using calibrated OD instruments, templates or full-gauge inspection fixtures.

What information is needed for cutter selection?

Provide the formation type, compressive strength, abrasiveness, bit size, planned rotary speed and expected run length.

Information Required for Quotation

Please provide:

• Nominal hole size
• Bit diameter
• Required Roller Reamer working OD
• Minimum restriction ID
• Near-Bit or String configuration
• Tool position in the BHA
• Top connection
• Bottom connection
• Box-up or pin-down orientation
• Required internal bore
• Fishing-neck OD requirement
• Formation type
• Formation compressive strength
• Formation abrasiveness
• Soft, medium-hard or hard formation
• Type T, Type F or Type B cutter
• Full-gauge, under-gauge or over-gauge cutter
• Forward reaming or bidirectional operation
• Maximum rotary speed
• Expected cutter revolutions
• Maximum operating torque
• Maximum overpull
• Maximum weight on tool
• Maximum dogleg severity
• Well inclination
• Vertical, directional or horizontal application
• Drilling-fluid type
• Mud density
• Solids content
• Chloride concentration
• Maximum flow rate
• Maximum operating temperature
• Open- or sealed-bearing requirement
• Standard or non-magnetic body
• Sour-service requirement
• Spare cutter quantity
• Redress-kit requirement
• NDE requirements
• Third-party inspection
• Documentation requirements
• Required quantity
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies Three-Point Roller Reamers for wellbore conditioning, gauge maintenance and BHA stabilization in vertical, directional, horizontal and extended-reach drilling.

The standard published range includes:

• 5-7/8–28 in hole sizes
• Near-Bit and String Roller Reamer configurations
• Type T sharp-tooth cutters
• Type F flat-tooth cutters
• Type B tungsten-carbide-button cutters
• NC38 and NC50 connections
• 3-1/2 REG through 7-5/8 REG connections
• Replaceable cutters, axles and block assemblies
• Open- and sealed-bearing configurations
• Standard alloy-steel and non-magnetic options
• Complete field redress and spare-parts packages

Complete tools can be supplied with material traceability, mechanical-property reports, UT and MPI records, connection-gauge reports, full-gauge inspection and cutter-function documentation.

Email: info@goldenman.com