Interchangeable Sleeve Stabilizers for Near-Bit and String BHAs

Description

Goldenman Replaceable Sleeve Stabilizers use a reusable high-strength mandrel and an interchangeable outer stabilizing sleeve.

One mandrel series can accept different qualified sleeve outside diameters, allowing the drilling contractor or operator to adapt the stabilizer to different hole sizes without purchasing a complete new tool for every gauge.

The sleeve can also be changed when:

• The blade surface reaches its wear limit
• A different hole size is required
• A different hardfacing system is required
• Formation abrasiveness changes
• A casing-friendly wear surface is needed
• The BHA changes from String to Near-Bit application
• A damaged sleeve requires replacement
• A spare sleeve is prepared for the next hole section

The published Goldenman series covers nominal hole sizes from 6 to 28 inches, with Mandrel Series 41, 62, 77 and 96.

Standard published connections include:

• NC38
• NC50
• 6-5/8 REG
• 7-5/8 REG

The final sleeve, mandrel, retention system, blade geometry and connection arrangement are manufactured according to the approved assembly drawing.

Product Short Description

Goldenman Replaceable Sleeve Stabilizers combine the structural capacity of a reusable alloy-steel mandrel with the flexibility of a replaceable wear sleeve.

The outer sleeve carries the stabilizing blades and hardfacing. When the blades become under gauge, the worn sleeve can be removed and replaced while the mandrel remains in service after inspection.

Different sleeves can be prepared for:

• Different hole diameters
• Full-gauge or under-gauge operation
• Soft, medium or abrasive formations
• Open-hole drilling
• Selected cased-hole operation
• Near-Bit Stabilizer applications
• String Stabilizer applications
• Different hardfacing patterns

This modular arrangement reduces the number of complete stabilizer bodies required in inventory and simplifies field redressing in locations where machine-shop support is limited.

Product Highlights

• Reusable integral mandrel
• Interchangeable stabilizing sleeves
• Published hole sizes from 6 to 28 in
• Mandrel Series 41, 62, 77 and 96
• Near-Bit and String Stabilizer configurations
• Different sleeve ODs for one qualified mandrel series
• Full-gauge and under-gauge sleeve options
• Spiral and application-specific blade profiles
• Three- and four-blade configurations
• Different wear surfaces on interchangeable sleeves
• Reduced complete-tool inventory
• Replacement of sleeve instead of complete mandrel
• Faster field preparation between hole sections
• High-strength heat-treated alloy-steel mandrel
• Heat-treated alloy-steel sleeve
• Tungsten-carbide wear protection
• Casing-friendly hardbanding options
• Large internal circulation bore
• Open drilling-fluid bypass channels
• NC38 and NC50 connection options
• 6-5/8 REG and 7-5/8 REG connections
• Box × Box, Box × Pin and Pin × Box options
• Full material and heat-number traceability
• Mandrel UT and MPI inspection
• Sleeve dimensional and surface inspection
• Rotary-connection thread gauging
• Sleeve-retention inspection
• Blade-gauge and concentricity verification
• Replacement sleeve and field-spares packages

General Technical Specifications

Parameter	Available Configuration
Product	Replaceable Sleeve Stabilizer
Product category	Rotary BHA Stabilizer
Main construction	Reusable mandrel with interchangeable sleeve
Published hole range	6–28 in
Published mandrel series	41, 62, 77 and 96
BHA applications	Near-Bit and String Stabilizer
Sleeve gauge	Full gauge, under gauge or custom
Blade configuration	Spiral or application-specific
Blade quantity	Three or four according to design
Mandrel material	Heat-treated high-strength alloy steel
Sleeve material	Heat-treated alloy steel
Wear protection	Carbide inserts, crushed carbide or qualified hardbanding
Sleeve retention	Model-specific mechanical retention system
Internal bore	Mandrel-series dependent
Connection options	NC38, NC50, REG and approved custom connections
Product requirements	Applicable API Spec 7-1 requirements when ordered
Connection requirements	API Spec 7-2 for qualifying rotary-shouldered connections
Drilling fluids	WBM, OBM, SBM and compatible drilling fluids
Well profiles	Vertical, directional, horizontal and extended reach
Inspection	Material, UT, MPI, dimensional, connection and functional inspection
Supply options	Complete tool, mandrel, individual sleeves and spare kits

Goldenman Published Model Specifications

Hole Size	Mandrel Series	Sleeve Body OD	Sleeve Length	Fishing Neck OD	Upset OD	Bottom Neck OD	Fishing Neck Length	Overall Length	Published Connection
6 in	41	5-1/4 in	10 in	4-3/4 in	5-1/8 in	4-1/2 in	20 in	48 in	NC38
8-1/2 in	62	7-1/2 in	19 in	6-3/4 in	7-1/2 in	6-1/4 in	22 in	65 in	NC50
12-1/4 in	77	9-1/2 in	20 in	8 in	9-1/4 in	7-3/4 in	22 in	70 in	6-5/8 REG
16 in	96	11-1/2 in	24 in	9-1/2 in	11 in	9 in	28 in	82-3/4 in	7-5/8 REG
17-1/2 in	96	11-1/2 in	24 in	9-1/2 in	11 in	9 in	28 in	82-3/4 in	7-5/8 REG
22 in	96	14-1/4 in	27-1/2 in	9-1/2 in	11 in	9 in	28 in	82-3/4 in	7-5/8 REG
24 in	96	14-1/4 in	27-1/2 in	9-1/2 in	11 in	9 in	28 in	82-3/4 in	7-5/8 REG
26 in	96	17 in	27-1/2 in	9-1/2 in	11 in	9 in	28 in	82-3/4 in	7-5/8 REG
28 in	96	17-1/4 in	27-1/2 in	9-1/2 in	11 in	9 in	28 in	82-3/4 in	7-5/8 REG

The published table identifies standard dimensional combinations. The final tool ID, sleeve bore, blade width, crown length, top and bottom connection orientation and sleeve retention details are controlled by the approved Goldenman drawing.

Metric Size Reference

Nominal Hole Size	Metric Hole Diameter
6 in	152.4 mm
8-1/2 in	215.9 mm
12-1/4 in	311.2 mm
16 in	406.4 mm
17-1/2 in	444.5 mm
22 in	558.8 mm
24 in	609.6 mm
26 in	660.4 mm
28 in	711.2 mm

What Is a Replaceable Sleeve Stabilizer?

A Replaceable Sleeve Stabilizer is a modular fixed-gauge BHA tool consisting of:

1. A reusable load-bearing mandrel
2. A removable outer sleeve
3. Stabilizing blades machined or formed on the sleeve
4. A qualified sleeve-retention system
5. Wear-resistant material applied to the blade surfaces
6. Rotary-shouldered connections at the ends of the mandrel

The mandrel carries:

• Axial tensile load
• Compressive load
• Rotary torque
• Bending load
• Drilling-fluid pressure
• Connection load

The sleeve provides:

• Wellbore contact
• BHA radial support
• Gauge control
• Wear surface
• Blade flow channels
• Formation-specific contact geometry

Separating these functions allows the mandrel to remain in service while the sleeve is replaced.

Modular Mandrel-and-Sleeve Design

The modular design provides two main operating advantages.

Multiple Hole Sizes

One qualified mandrel series can accept sleeves with different working ODs.

This allows the same mandrel platform to support several drilling programs, provided every sleeve-and-mandrel combination is included in the approved design.

Replaceable Wear Component

The sleeve contains the blade gauge and wear protection.

When blade wear exceeds the permitted limit, the sleeve can be replaced without removing material from the primary mandrel or discarding the complete stabilizer.

The mandrel must still pass the required dimensional and nondestructive inspection before reuse.

Reusable Mandrel

The mandrel is the main structural component of the stabilizer.

It provides:

• Top and bottom BHA connections
• Internal drilling-fluid bore
• Fishing-neck section
• Sleeve support surfaces
• Sleeve-retention features
• Torque transmission
• Axial-load transmission
• Bending resistance
• Pressure integrity

The mandrel is manufactured from heat-treated high-strength alloy steel and assigned an individual heat number and serial number.

Replaceable Sleeve

The outer sleeve contains:

• Stabilizer blades
• Leading and trailing tapers
• Gauge surfaces
• Hardfacing
• Internal mandrel interface
• Retention features
• Flow channels between blades

Sleeves can be stocked by:

• Mandrel series
• Working OD
• Blade profile
• Blade quantity
• Hardfacing type
• Gauge condition
• Formation application

A sleeve should never be installed on an unapproved mandrel series solely because the nominal diameters appear similar.

Sleeve Retention

The sleeve is secured to the mandrel using the model-specific retention arrangement shown on the approved assembly drawing.

The retention system must:

• Transfer operating torque
• Prevent axial sleeve movement
• Prevent sleeve rotation relative to the mandrel
• Resist drilling vibration
• Resist repeated impact
• Maintain correct blade orientation
• Allow controlled shop or field removal
• Prevent loose components from entering the well

Before running, the operator must verify:

• Correct sleeve and mandrel combination
• Correct installation direction
• Complete engagement
• Correct locking components
• Required assembly torque
• Final mechanical lock
• Sleeve concentricity
• Full working OD

Operating Principle

When installed in the BHA, the stabilizer sleeve contacts or approaches the borehole wall.

The blade OD creates defined radial support points that help:

• Keep Drill Collars away from broad wall contact
• Limit lateral BHA movement
• Control the effective BHA fulcrum
• Improve bit stability
• Reduce lateral vibration
• Support weight transfer to the bit
• Control build, hold or drop tendency
• Maintain a consistent borehole profile
• Reduce localized tool-body wear

The stabilizer does not steer independently. Its directional effect depends on sleeve OD, BHA position, spacing, Drill Collar stiffness, bit type and operating parameters.

Near-Bit Replaceable Sleeve Stabilizer

A Near-Bit Sleeve Stabilizer is installed immediately above or close to the drill bit.

It is used to:

• Stabilize the lower BHA
• Reduce bit whirl
• Limit lateral bit movement
• Maintain hole gauge near the bit
• Improve directional response
• Reduce borehole spiraling
• Protect the lower Drill Collar
• Influence build, hold or drop behavior

The lower connection is matched to the bit, Bit Sub, Downhole Motor or other adjacent component.

Near-Bit configurations usually require a shorter distance between the sleeve and lower connection than String Stabilizer configurations.

String Replaceable Sleeve Stabilizer

A String Sleeve Stabilizer is installed farther above the bit.

Typical positions include:

• Between Drill Collars
• Above a Downhole Motor
• Above or below MWD and LWD tools
• Within a packed BHA
• Between Non-Magnetic Drill Collars
• In tangent or hold sections
• At predicted high-contact BHA positions

The String Stabilizer helps control Drill Collar bending and lateral movement after the bit has passed.

Near-Bit vs String Configuration

Selection Factor	Near-Bit Configuration	String Configuration
Normal position	Close to the bit	Higher in the BHA
Main function	Bit and lower-BHA stabilization	Drill Collar and string stabilization
Directional influence	Strong near-bit influence	Depends on placement and spacing
Lower connection	Matched to bit-side component	Matched to adjacent Drill Collar
Tool geometry	Short lower section	Longer string configuration
Sleeve replacement	Replaceable	Replaceable
Main selection input	Bit-to-stabilizer geometry	Complete BHA contact model

Replaceable Sleeve vs Integral Blade Stabilizer

Replaceable Sleeve Stabilizer	Integral Blade Stabilizer
Mandrel and sleeve are separate	Body and blades are one piece
Worn sleeve can be replaced	Worn blades require body redressing
One mandrel can support multiple sleeves	One body normally has one working OD
More flexible inventory	More complete tools required
Contains a sleeve-retention system	No sleeve-retention components
Requires sleeve-to-mandrel inspection	High structural continuity
Lower replacement cost after sleeve wear	Simpler one-piece construction
Useful in remote and rental operations	Preferred for maximum structural simplicity

The two pages should remain separate because they serve different inventory, maintenance and risk priorities.

Replaceable Sleeve vs Welded Blade Stabilizer

Replaceable Sleeve Stabilizer	Welded Blade Stabilizer
Replaceable outer gauge section	Blades welded directly to body
Reusable mandrel	Complete body normally redressed
No blade weld on the mandrel body	Structural blade-to-body welds
Sleeve can carry different wear surfaces	Blade geometry fixed to body
Retention system requires inspection	Weld quality requires inspection
Modular size management	Economical fixed configuration

Replaceable Sleeve Stabilizer vs Roller Reamer

Sleeve Stabilizer	Roller Reamer
Uses fixed blades	Uses rotating roller cutters
Primary function is stabilization	Stabilizes and actively conditions hole
Sleeve can be replaced	Rollers, bearings and axles are replaced
Blades slide against wellbore	Rollers reduce sliding contact
No moving cutter bearings	Contains moving cutter components
Requires hardfacing inspection	Requires roller and bearing inspection

Replaceable Sleeve vs Variable-Gauge Stabilizer

Replaceable Sleeve Stabilizer	Variable-Gauge Stabilizer
Sleeve changed at surface	Gauge changes downhole
Fixed OD during each run	Expandable or retractable support system
No hydraulic activation	Hydraulic or mechanical actuation
Lower mechanical complexity	Contains seals and moving elements
Requires trip to change gauge	Can change condition during operation
Modular inventory benefit	Downhole operational flexibility

Full-Gauge Sleeve

A Full-Gauge Sleeve has a working OD close to the planned finished-hole or bit diameter.

It provides:

• Strong radial support
• Controlled BHA position
• Reduced Drill Collar wall contact
• Improved hole-size consistency
• Predictable BHA directional response

The required clearance below bit gauge is defined by the drilling program.

Under-Gauge Sleeve

An Under-Gauge Sleeve has a working OD smaller than the nominal hole diameter.

It is used to:

• Reduce torque and drag
• Increase tripping clearance
• Reduce contact in unstable formations
• Adjust BHA directional response
• Compensate for expected hole conditions
• Reduce the risk of stabilizer sticking

An excessively under-gauge sleeve provides limited stabilization.

The OD must therefore be selected from BHA modeling and operating requirements.

Interchangeable Hole-Size Sleeves

A qualified mandrel can support different sleeve ODs within its approved range.

This can reduce the number of mandrels required for drilling programs containing several hole sections.

For example, a fleet can stock:

• One inspected mandrel
• One full-gauge sleeve
• One under-gauge sleeve
• One sleeve with aggressive carbide wear protection
• One casing-friendly sleeve
• One spare sleeve ready for the next run

Every sleeve must be clearly identified with its matching mandrel series.

Spiral Blade Sleeve

A Spiral Blade Sleeve provides progressive contact with the borehole.

Advantages include:

• Smooth entry into restrictions
• Distributed circumferential contact
• Open helical fluid channels
• Controlled radial support
• Reduced abrupt blade impact
• Stable rotation in directional wells
• Broad gauge-wear surface

The blade wrap and flow area are selected for formation, side load and hydraulic requirements.

Straight Blade Sleeve

A Straight Blade Sleeve uses blades parallel to the tool axis.

It provides:

• Direct radial support
• Straight drilling-fluid channels
• Large solids bypass
• Simple gauge inspection
• Straightforward hardfacing repair
• Reduced spiral reaction

Straight blades are used where direct support, open flow area or simplified redressing is preferred.

Three-Blade Sleeve

Three blades provide:

• Three radial support points
• Large bypass channels
• Reduced contact area
• Good cuttings transport
• Lower risk of packing
• Lower total sleeve weight

This arrangement is commonly selected for sticky formations and high-solids drilling environments.

Four-Blade Sleeve

Four blades provide:

• Increased contact distribution
• Increased wear area
• Greater radial support
• Reduced unsupported circumference
• Stable BHA positioning

The additional blade area can increase torque under high side load and reduce available bypass area.

Blade Crown and Tapers

The blade crown is the full-gauge working section.

Leading and trailing tapers:

• Guide the tool into restrictions
• Reduce abrupt impact
• Support forward and reverse movement
• Protect the gauge edge
• Reduce blade hang-up
• Control contact transition

The approved drawing should identify:

• Crown length
• Blade width
• Leading taper angle
• Trailing taper angle
• Spiral wrap
• Gauge length
• Hardfacing limits

Hardfacing Options

The replaceable sleeve allows different hardfacing systems to be stocked for the same mandrel.

Available configurations can include:

• Crushed tungsten-carbide hardfacing
• Tungsten-carbide inserts
• Carbide blocks or tiles
• Sintered carbide buttons
• Smooth casing-friendly hardbanding
• Non-magnetic-compatible wear overlay
• Project-specific wear patterns

The hardfacing system is selected from:

• Formation abrasiveness
• Expected run length
• Rotary speed
• BHA side load
• Open-hole or cased-hole service
• Sleeve redressing plan
• Maximum permitted gauge wear

Crushed Tungsten-Carbide Hardfacing

Crushed carbide particles are deposited in a metallic matrix over selected blade surfaces.

This system provides:

• Broad abrasion protection
• Flexible coverage
• Leading-edge protection
• Gauge-surface protection
• Shop repair capability

Inspection covers:

• Coverage
• Deposit thickness
• Carbide distribution
• Bond condition
• Cracking
• Porosity
• Final working OD

Tungsten-Carbide Inserts

Carbide inserts provide localized wear resistance.

Inspection includes:

• Insert grade
• Insert dimensions
• Interference fit
• Insert projection
• Insert pattern
• Missing inserts
• Cracked sleeve material
• Final sleeve gauge

Casing-Friendly Sleeve

A sleeve that may rotate inside casing requires a wear surface selected to reduce casing damage.

The design balances:

• Stabilizer wear resistance
• Smooth contact
• Friction
• Casing-wear rate
• Resistance to cracking
• Resistance to spalling
• Surface hardness

Aggressive exposed carbide should not be assumed suitable for prolonged cased-hole rotation.

Mandrel Material

The standard mandrel uses heat-treated high-strength alloy steel selected for:

• Tensile strength
• Torsional strength
• Impact toughness
• Fatigue resistance
• Bending resistance
• Connection strength
• Stable heat-treatment response

The exact material grade, heat treatment and mechanical properties are stated in the approved datasheet and Material Test Certificate.

Sleeve Material

The sleeve requires:

• Wear resistance
• Impact resistance
• Stable hardfacing support
• Machinability
• Dimensional stability
• Resistance to blade cracking
• Compatibility with the mandrel interface

Sleeve material and heat treatment are selected separately from the mandrel when required by the design.

Non-Magnetic Sleeve Configurations

Project-specific sleeves can be manufactured for non-magnetic mandrels used near MWD, LWD or survey tools.

The manufacturing process must control:

• Magnetic permeability
• Local magnetic field
• Heat input
• Hardfacing material
• Contamination by ferromagnetic material
• Final magnetic inspection

A conventional alloy-steel sleeve should not be installed on a non-magnetic assembly where magnetic isolation is required.

Internal Circulation Bore

The mandrel bore carries drilling fluid through the stabilizer.

Bore selection considers:

• Pump flow rate
• Bit hydraulics
• MWD and LWD requirements
• Pressure loss
• Connection size
• Mandrel wall thickness
• Tensile and torsional capacity
• Passage of activation devices

The current Goldenman table does not publish the tool ID, so this value must be confirmed in the quotation and final drawing.

Annular Bypass Area

Flow channels between the sleeve blades allow drilling fluid and cuttings to pass around the stabilizer.

Adequate bypass helps reduce:

• Local pressure loss
• ECD increase
• Cuttings packing
• Blade erosion
• Stabilizer balling
• Differential-sticking exposure

Bypass area is influenced by:

• Sleeve body OD
• Blade OD
• Blade quantity
• Blade width
• Spiral wrap
• Hole diameter
• Flow rate
• Cuttings loading

Rotary-Shouldered Connections

Published Goldenman connections include:

• NC38
• NC50
• 6-5/8 REG
• 7-5/8 REG

Additional approved connections can be supplied according to mandrel size and strength requirements.

Connection arrangements can include:

• Box × Box
• Box × Pin
• Pin × Box
• Near-Bit bit-side connection
• Project-specific crossover arrangement

Connection Inspection

Inspection of qualifying rotary-shouldered connections includes:

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

Stress-Relief Features

Stress-relief grooves and box borebacks are available where required by the approved connection design.

Their use must account for:

• Connection cross-sectional area
• Tensile capacity
• Torsional capacity
• Fatigue loading
• BHA bending
• Internal bore
• Connection geometry

API Spec 7-1 Positioning

API Spec 7-1 provides technical delivery requirements for stabilizers and other defined Rotary Drill Stem Elements.

Applicable requirements can cover:

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

API Spec 7-1 does not independently define:

• Sleeve-retention torque
• Sleeve service life
• Hardfacing service life
• Maximum operating RPM
• Guaranteed vibration reduction
• Guaranteed torque reduction
• Directional build rate
• Maximum drilling interval

These are controlled by the Goldenman design, qualification data and operating conditions.

API Spec 7-2 Positioning

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

Connection conformity does not independently verify:

• Sleeve retention
• Blade performance
• Stabilizing efficiency
• Hardfacing life
• Mandrel-to-sleeve compatibility
• Maximum operating load

The page should not describe the complete tool as “API 7-2 certified.”

BHA Placement

Placement is determined from:

• Bit type
• Bit diameter
• Drill Collar OD
• Motor position
• MWD or LWD position
• Stabilizer spacing
• Neutral point
• BHA bending
• Well inclination
• Dogleg severity
• Required build, hold or drop tendency
• Torque-and-drag model

Changing sleeve OD without reviewing the BHA model can alter directional response.

Build, Hold and Drop Applications

Build BHA

A Near-Bit Stabilizer with selected spacing can create a fulcrum effect that supports build tendency.

Hold BHA

Multiple correctly gauged stabilizers can create a packed BHA that resists bending and supports tangent drilling.

Drop BHA

Positioning the first major stabilizing point farther above the bit can create a pendulum effect and support drop tendency.

Actual directional performance depends on the complete BHA and formation response.

Vertical-Well Applications

In vertical wells, the tool can help:

• Control unplanned deviation
• Reduce Drill Collar contact
• Stabilize the bit
• Reduce borehole spiraling
• Improve weight transfer
• Maintain hole gauge

Directional-Well Applications

In directional drilling, the stabilizer helps control:

• BHA contact points
• Build and hold response
• Lateral vibration
• Toolface stability
• Drill Collar bending
• Borehole tortuosity
• Dogleg quality

Horizontal and Extended-Reach Applications

Horizontal and extended-reach wells create high lateral contact and cumulative friction.

A correctly selected sleeve can support:

• Reduced Drill Collar wall contact
• Improved weight transfer
• BHA stability
• Reduced lateral tool movement
• Protection of directional equipment
• Improved hole quality

The sleeve OD, blade area and flow channels must be selected carefully to control torque, packing and sticking risk.

Formation Selection

Soft and Sticky Formations

Recommended design priorities include:

• Large bypass channels
• Reduced blade contact area
• Three-blade sleeve
• Open spiral
• Smooth surface transitions
• Controlled under-gauge clearance

Medium Formations

Common configurations include:

• Spiral or straight blades
• Three or four blades
• Standard carbide hardfacing
• Full-gauge or slightly under-gauge sleeve

Hard and Abrasive Formations

Recommended features include:

• High-wear carbide protection
• Increased gauge-surface coverage
• Strong sleeve base material
• Controlled insert retention
• Frequent post-run gauge inspection
• Prepared spare sleeves

Sleeve Selection

The correct sleeve is selected using:

• Mandrel series
• Nominal hole size
• Bit diameter
• Required sleeve working OD
• Full-gauge or under-gauge requirement
• Sleeve body OD
• Mandrel interface
• Blade quantity
• Blade profile
• Hardfacing type
• Formation abrasiveness
• BHA position
• Minimum restriction
• Cased-hole exposure

The sleeve part number should identify every critical configuration.

Sleeve Identification

Each sleeve should be permanently identified with:

• Goldenman identification
• Mandrel series
• Sleeve part number
• Working OD
• Sleeve body OD
• Blade configuration
• Hardfacing type
• Material batch
• Manufacturing date
• Matching mandrel family
• Installation direction where required

Pre-Assembly Inspection

Before fitting a sleeve:

1. Confirm the mandrel series.
2. Confirm the sleeve part number.
3. Confirm the required hole size.
4. Measure the sleeve working OD.
5. Inspect the sleeve bore.
6. Inspect the mandrel support surfaces.
7. Inspect the retention components.
8. Remove corrosion, solids and damaged coating.
9. Inspect the blade hardfacing.
10. Check for blade cracks.
11. Verify the installation direction.
12. Confirm the assembly procedure and required torque.

Sleeve Installation

A general sleeve-change procedure includes:

1. Secure the mandrel using approved handling equipment.
2. Clean the mandrel and sleeve interfaces.
3. Inspect all load-transfer surfaces.
4. Position the correct sleeve on the mandrel.
5. Install the sleeve using the approved procedure.
6. Apply the specified assembly torque where required.
7. Install all mechanical locking components.
8. Verify complete engagement.
9. Confirm that no axial movement remains.
10. Measure sleeve runout and concentricity.
11. Measure the final working OD.
12. Complete the sleeve-retention inspection.
13. Record the sleeve and mandrel serial numbers.

The model-specific Goldenman assembly procedure takes priority over general instructions.

Sleeve Removal

Before removal:

• Confirm the tool is fully cleaned
• Verify no trapped pressure
• Support the sleeve and mandrel correctly
• Remove mechanical locks using the approved procedure
• Avoid uncontrolled heating
• Avoid cutting into the mandrel
• Inspect the mandrel after the sleeve is removed

A seized sleeve should be removed in a qualified workshop rather than by uncontrolled impact or flame cutting.

Pre-Run Inspection

Before running the complete stabilizer:

• Confirm the hole size
• Confirm the sleeve OD
• Confirm mandrel series
• Confirm Near-Bit or String configuration
• Verify top and bottom connections
• Check sleeve retention
• Inspect hardfacing
• Measure blade gauge
• Measure sleeve concentricity
• Inspect fishing neck
• Inspect the internal bore
• Gauge the connections
• Verify clearance through all known restrictions
• Record the tool assembly

Drilling Operation

During drilling, monitor:

• Surface and downhole torque
• Rotary speed
• Weight on bit
• Rate of penetration
• Standpipe pressure
• Lateral vibration
• Stick-slip
• Whirl
• Directional response
• Hook load
• Cuttings returns
• Hole-cleaning performance

An increase in torque or vibration can indicate:

• Excessive sleeve contact
• Cuttings packing
• Sleeve damage
• Hardfacing loss
• Incorrect gauge
• High BHA side force
• Formation transition
• Retention-system movement

Common Failure Modes

Sleeve Becomes Under Gauge

Possible causes include:

• Abrasive formation
• Hardfacing wear
• Carbide loss
• Excessive side load
• Long rotating interval
• Incorrect wear surface

Sleeve Loosening

Possible causes include:

• Incorrect assembly
• Incomplete mechanical locking
• Incorrect installation torque
• Worn mandrel interface
• Worn sleeve interface
• Torsional vibration
• Repeated impact
• Mismatched sleeve and mandrel

Sleeve Cannot Be Removed

Possible causes include:

• Corrosion
• Packed drilling solids
• Interface deformation
• Galling
• Excessive assembly load
• Retention-component damage
• Bending or impact

Blade or Sleeve Cracking

Possible causes include:

• Material defect
• Improper heat treatment
• Severe impact
• Excessive bending
• Hardfacing heat damage
• Insufficient base-wall thickness
• Previous unrecorded overload

Excessive Torque

Possible causes include:

• Full-gauge sleeve in a tight hole
• Excessive blade contact area
• Cuttings packed around blades
• High side load
• Hole collapse
• Incorrect sleeve OD
• Inadequate flow area

Mandrel Damage

Possible causes include:

• Sleeve movement
• Fretting at the interface
• Excessive torque
• Connection fatigue
• BHA bending
• Improper sleeve removal
• Corrosion beneath the sleeve
• Repeated overload

Sleeve-Retention Failure

Possible causes include:

• Missing locking components
• Incorrect component grade
• Incomplete installation
• Incorrect assembly torque
• Fatigue
• Impact
• Excessive vibration
• Unapproved sleeve combination

Post-Run Inspection

After each run:

1. Clean the complete tool.
2. Remove solids from blade channels.
3. Measure sleeve working OD.
4. Record gauge loss.
5. Inspect the hardfacing.
6. Inspect carbide inserts.
7. Inspect sleeve retention.
8. Check for axial or rotational sleeve movement.
9. Inspect the mandrel fishing neck.
10. Inspect the internal bore.
11. Inspect top and bottom connections.
12. Perform MPI on critical areas.
13. Determine whether the sleeve can be reused, redressed or replaced.
14. Record the sleeve and mandrel run history.
15. Apply corrosion protection.
16. Install thread protectors.

Sleeve Replacement Criteria

Replace the sleeve when:

• Gauge wear exceeds the approved limit
• Blade cracking is detected
• Carbide loss exceeds the repair limit
• Hardfacing is extensively spalled
• Sleeve retention surfaces are damaged
• Sleeve runout exceeds tolerance
• Permanent deformation is detected
• The required hole size changes
• A different hardfacing system is required

Mandrel Reuse Criteria

The mandrel can be reused after it passes:

• Dimensional inspection
• Fishing-neck inspection
• Sleeve-interface inspection
• Internal-bore inspection
• Connection inspection
• UT where required
• MPI
• Straightness inspection
• Retention-feature inspection
• Run-history review

A reusable mandrel is not automatically acceptable solely because the sleeve was removed successfully.

Manufacturing Process

Goldenman manufacturing includes:

1. Mandrel raw-material verification
2. Sleeve material verification
3. Heat-number assignment
4. Mandrel forging or bar UT
5. Rough mandrel machining
6. Mandrel heat treatment
7. Mechanical-property testing
8. Internal-bore machining
9. Fishing-neck machining
10. Sleeve-interface machining
11. Retention-feature machining
12. Top and bottom connection machining
13. Thread gauging
14. Sleeve blank machining
15. Sleeve heat treatment
16. Sleeve bore machining
17. Blade profiling
18. Leading- and trailing-taper machining
19. Hardfacing or carbide application
20. Final sleeve-gauge finishing
21. Sleeve-and-mandrel fit inspection
22. Concentricity inspection
23. Retention-system inspection
24. Mandrel UT and MPI
25. Sleeve MPI
26. Final dimensional inspection
27. Product marking
28. Documentation review
29. Export packaging

Quality Control

Quality control includes:

• Material certificate verification
• Chemical-composition testing
• Heat-number traceability
• Heat-treatment records
• Yield-strength testing
• Tensile-strength testing
• Elongation testing
• Impact testing
• Mandrel hardness
• Sleeve hardness
• Mandrel UT
• Mandrel MPI
• Sleeve MPI
• Mandrel straightness
• Internal-bore inspection
• Fishing-neck inspection
• Sleeve-interface inspection
• Sleeve bore inspection
• Blade OD inspection
• Sleeve body OD inspection
• Blade crown inspection
• Hardfacing inspection
• Carbide-insert inspection
• Concentricity inspection
• Sleeve-retention inspection
• Thread-gauge inspection
• Shoulder inspection
• Final visual inspection

Product Marking

The complete assembly can be marked with:

• Goldenman identification
• Replaceable Sleeve Stabilizer
• Mandrel series
• Mandrel serial number
• Sleeve serial or batch number
• Sleeve working OD
• Near-Bit or String configuration
• Top connection
• Bottom connection
• Mandrel material
• Sleeve material
• Hardfacing type
• Heat numbers
• Manufacturing date
• Applicable standard reference

Product Documentation

Available documentation includes:

• Certificate of Conformity
• Product datasheet
• General assembly drawing
• Mandrel drawing
• Sleeve drawing
• Sleeve compatibility chart
• Material Test Certificates
• EN 10204 3.1 certificates
• Chemical-composition reports
• Heat-treatment records
• Mechanical-property reports
• Hardness reports
• Impact-test reports
• Ultrasonic-inspection report
• Magnetic-particle-inspection reports
• Thread-gauge inspection report
• Dimensional inspection report
• Blade-gauge inspection report
• Sleeve-fit inspection report
• Concentricity report
• Sleeve-retention inspection report
• Hardfacing inspection report
• Material and component traceability list
• Makeup-torque recommendation
• Sleeve installation procedure
• Operating and maintenance manual
• Redressing and retirement criteria
• Packing list
• Third-party inspection report

Spare Parts and Supply Options

Goldenman supplies:

• Complete Replaceable Sleeve Stabilizers
• Individual Mandrels
• Full-Gauge Sleeves
• Under-Gauge Sleeves
• Near-Bit Sleeves
• String Stabilizer Sleeves
• Spiral Blade Sleeves
• Custom Blade Sleeves
• Carbide-Hardfaced Sleeves
• Casing-Friendly Sleeves
• Sleeve-Retention Components
• Mechanical Locking Components
• Thread Protectors
• Sleeve Handling Tools
• Inspection Gauges
• Field Spare-Sleeve Packages

Frequently Asked Questions

What product is shown on this page?

This page covers Goldenman Replaceable Sleeve Stabilizers with reusable mandrels and interchangeable stabilizing sleeves.

What is the published size range?

The current published range covers nominal hole sizes from 6 to 28 inches.

What mandrel series are published?

The current table includes:

• Series 41
• Series 62
• Series 77
• Series 96

Can one mandrel use different sleeve sizes?

Yes.

One qualified mandrel series can accept different approved sleeve ODs within its design range.

Can sleeves be changed on the rig floor?

The modular design supports field sleeve changes when the correct handling equipment, inspection procedure and assembly instructions are available.

Why replace only the sleeve?

The sleeve carries the blades and wear surface.

Replacing the sleeve allows the inspected mandrel to remain in service and avoids replacing the complete stabilizer after normal gauge wear.

Can the tool be used as a Near-Bit Stabilizer?

Yes.

Near-Bit configurations are available with connections and geometry matched to the lower BHA.

Can it be used as a String Stabilizer?

Yes.

String configurations are installed between Drill Collars or other BHA components.

Are full-gauge and under-gauge sleeves available?

Yes.

The required sleeve working OD must be specified in the purchase order.

Are spiral blades available?

Yes.

Spiral and project-specific blade profiles can be manufactured according to approved sleeve drawings.

Are three- and four-blade sleeves available?

Yes.

Blade quantity is selected from hole size, required support, flow area and formation conditions.

Can different hardfacing systems be installed on the same mandrel series?

Yes.

Different sleeves can be prepared with wear surfaces matched to different formations or cased-hole requirements.

Which hardfacing is suitable for abrasive formations?

Tungsten-carbide inserts or carbide hardfacing are commonly selected for abrasive open-hole service.

The final choice depends on formation, side load and required run length.

Is a casing-friendly sleeve available?

Yes.

Smooth casing-friendly hardbanding can be specified for selected cased-hole contact applications.

What is the difference from an Integral Blade Stabilizer?

An Integral Blade Stabilizer has blades machined directly into the main body.

A Replaceable Sleeve Stabilizer uses a reusable mandrel and removable blade sleeve.

What is the difference from a Roller Reamer?

A Sleeve Stabilizer uses fixed blades.

A Roller Reamer uses rotating cutters and provides active hole conditioning.

What is the difference from a Variable-Gauge Stabilizer?

The Replaceable Sleeve Stabilizer has a fixed OD during each run and is reconfigured at surface.

A Variable-Gauge Stabilizer changes its operating diameter downhole.

What connections are published?

The Goldenman table currently lists:

• NC38
• NC50
• 6-5/8 REG
• 7-5/8 REG

Is the complete stabilizer API 7-2 certified?

No.

API Spec 7-2 applies to qualifying rotary-shouldered connections and gauging requirements.

It does not independently certify the sleeve retention or stabilizing performance.

Can it be manufactured to API Spec 7-1?

Applicable API Spec 7-1 material, manufacturing, inspection, traceability and marking requirements can be included in the purchase specification.

Does API Spec 7-1 define sleeve makeup torque?

No.

Sleeve assembly and retention requirements are controlled by the approved manufacturer drawing and procedure.

Can an industry make-up torque be copied to every Goldenman model?

No.

The required torque depends on the actual retention design, sleeve interface and mandrel series.

Only the Goldenman-approved assembly value should be used.

How is the correct sleeve ordered?

Specify:

• Mandrel series
• Sleeve working OD
• Near-Bit or String application
• Top and bottom connections
• Blade configuration
• Hardfacing type

Can the worn sleeve be redressed?

Yes, provided the sleeve base material, interface and blade geometry remain within the approved repair limits.

When should the entire mandrel be replaced?

The mandrel should be retired when it fails dimensional, NDE, connection, straightness, retention-feature or structural acceptance criteria.

Information Required for Quotation

Please provide:

• Mandrel series
• Required hole size
• Bit diameter
• Required sleeve working OD
• Full-gauge or under-gauge sleeve
• Near-Bit or String application
• Sleeve body OD
• Sleeve length
• Blade crown length
• Blade width
• Leading taper
• Trailing taper
• Straight or spiral blades
• Blade quantity
• Spiral wrap
• Top connection
• Bottom connection
• Box or Pin orientation
• Required tool ID
• Fishing-neck OD
• Fishing-neck length
• Overall length
• Sleeve-retention configuration
• Formation type
• Formation compressive strength
• Formation abrasiveness
• Maximum rotary speed
• Maximum operating torque
• Maximum tensile load
• Maximum dogleg severity
• Well inclination
• Drilling-fluid type
• Mud density
• Solids concentration
• Maximum flow rate
• Maximum operating temperature
• Alloy-steel or non-magnetic requirement
• H₂S concentration
• CO₂ concentration
• Hardfacing type
• Casing-friendly requirement
• Maximum permitted gauge wear
• Sleeve redress limit
• Spare sleeve quantity
• Spare retention-kit quantity
• NDE requirements
• Third-party inspection
• Documentation requirements
• Required complete-tool quantity
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies Replaceable Sleeve Stabilizers for Near-Bit and String BHA applications in vertical, directional, horizontal and extended-reach wells.

The published product range includes:

• 6–28 in hole sizes
• Mandrel Series 41, 62, 77 and 96
• Reusable high-strength mandrels
• Interchangeable full-gauge and under-gauge sleeves
• Near-Bit and String configurations
• Different blade and hardfacing options
• NC38 and NC50 connections
• 6-5/8 REG and 7-5/8 REG connections
• Individual replacement sleeves
• Field spare-sleeve packages
• Sleeve installation and inspection documentation

Complete tools and replacement sleeves can be supplied with material traceability, mechanical-property reports, UT and MPI records, connection-gauge inspection, dimensional reports, blade-gauge verification and sleeve-retention documentation.

Email: info@goldenman.com