ND-J Mechanical Internal Cutters for Tubing, Drill Pipe and Casing

Description

Goldenman ND-J Mechanical Internal Cutters are downhole fishing and intervention tools used to cut casing, production tubing and drill pipe from inside the tubular bore.

The cutter is run on Drill Pipe or a work string to the selected cutting depth. After the mechanical cutting assembly is set, hardened cutter blades expand against the internal pipe wall. Controlled rotation then produces a complete circumferential cut through the tubular body.

The cutter can be run independently or combined with a Releasing Casing Spear to complete cutting and recovery in one fishing operation.

The standard Goldenman range includes:

• ND-J114 for 4-1/2 in tubulars
• ND-J127 for 5 in tubulars
• ND-J140 for 5-1/2 in tubulars
• ND-J168 for 6-5/8 in tubulars
• ND-J178 for 7 in tubulars
• ND-J245 for 9-5/8 in tubulars
• NC26, NC31, NC38 and NC50 top connections
• Replaceable mechanical cutting blades
• One-trip cut-and-pull configurations
• Tubing, Drill Pipe and Casing cutting applications
• Workover, fishing, slot-recovery and abandonment service

Product Short Description

The ND-J Mechanical Internal Cutter cuts stuck, damaged or abandoned tubular strings without explosive, chemical or wireline cutting systems.

A mechanically actuated cutting assembly expands from the tool body and contacts the inner wall of the tubular. Surface rotation drives the hardened blades through the pipe wall until complete separation is achieved.

The tool can be run above an internal Spear so that the severed pipe section is gripped and recovered during the same trip. It can also be retrieved after cutting so that a separate fishing tool can recover the cut pipe.

Product Highlights

• Mechanical downhole internal cutting system
• Cuts casing, tubing and Drill Pipe
• Standard tubular range from 4-1/2 to 9-5/8 in
• Six standard Goldenman ND-J models
• Simple mechanical operating principle
• No explosive cutting charge
• No chemical cutting fluid
• No dedicated electric-line cutting unit
• Controlled circumferential pipe-body cutting
• Suitable for vertical, deviated and selected horizontal wells
• Compatible with rotary tables and top drives
• Compatible with power swivels
• Can be run on Drill Pipe or work tubing
• Replaceable hardened cutting blades
• High-strength alloy-steel tool body
• NC26, NC31, NC38 and NC50 connections
• Rotary-shouldered connections gauged to API Spec 7-2
• Compatible with Releasing Casing Spears
• Supports one-trip cut-and-pull operations
• Compatible with Fishing Jars and Bumper Subs
• Suitable for workover and plug-and-abandonment programs
• Full material and heat-number traceability
• UT and MPI inspection
• Connection-gauge inspection
• Blade-extension and retraction testing
• Functional cutting tests by project requirement
• Replacement blades and redress kits available

General Technical Specifications

Parameter	Available Configuration
Product	ND-J Mechanical Internal Cutter
Tool category	Downhole fishing and tubular-cutting tool
Cutting method	Mechanically expanded rotary cutting blades
Tubulars cut	Tubing, Drill Pipe, Casing and Liner
Standard tubular range	4-1/2–9-5/8 in
Standard models	ND-J114–ND-J245
Tool outside diameter	91–210 mm
Tubular ID range	97–228 mm
Top connections	NC26, NC31, NC38 and NC50
Connection specification	API Spec 7-2
Main body material	Heat-treated alloy steel
Blade material	Hardened alloy tool steel
Blade surface	Carbide or wear-resistant cutting surface
Actuation	Mechanical
Rotation source	Rotary table, Top Drive or Power Swivel
Work string	Drill Pipe or suitable work tubing
Circulation	Central circulation passage
Cutting position	Tubular body away from coupling or tool joint
Recovery options	Cutter retrieval or combined cut-and-pull
Service	Fishing, workover, abandonment and slot recovery
Inspection	Dimensional, thread, UT, MPI and functional testing
Supply	Complete cutter, blades and redress kit

Goldenman ND-J Model Specifications

Model	Tool OD	Top Connection	Target Tubular ID	Nominal Tubular OD
ND-J114	91 mm	NC26	97–104 mm	4-1/2 in
ND-J127	102 mm	NC26	107–115 mm	5 in
ND-J140	112 mm	NC31	118–128 mm	5-1/2 in
ND-J168	138 mm	NC38	144–153 mm	6-5/8 in
ND-J178	145 mm	NC38	150–166 mm	7 in
ND-J245	210 mm	NC50	216–228 mm	9-5/8 in

The correct model is selected from the actual tubular ID rather than nominal outside diameter alone.

The quotation must include:

• Tubular outside diameter
• Nominal weight
• Wall thickness
• Minimum internal diameter
• Maximum internal diameter
• Connection or coupling locations
• Tubular grade
• Cutting depth
• Well deviation
• Required work-string connection

What Is a Mechanical Internal Cutter?

A Mechanical Internal Cutter is a downhole tool that cuts a tubular from its internal bore.

The tool is used when:

• Tubing is stuck and cannot be pulled
• Drill Pipe is mechanically trapped
• Casing must be recovered
• A damaged section must be removed
• A completion string must be severed
• A casing string must be cut during abandonment
• A platform slot must be cleared
• A free upper section must be recovered above a stuck interval
• An internal cut is preferred over an external Washover Cutter

The cutter creates one circumferential separation through the pipe wall.

It is not a Section Mill and does not remove a long interval of casing.

Mechanical Cutting Principle

The ND-J Cutter uses a mechanically actuated blade assembly.

A typical cutting sequence includes:

1. The tool is run inside the selected tubular.
2. The cutter is positioned at the planned cutting depth.
3. The mechanical setting mechanism is activated.
4. Cutter blades move outward toward the pipe ID.
5. Controlled axial loading maintains blade contact.
6. The work string is rotated.
7. The blades progressively cut into the pipe wall.
8. Rotation continues until full circumferential separation is achieved.
9. The blades are returned to the retracted position.
10. The cutter or severed pipe is recovered.

Exact setting movement, rotation direction, axial loading and release sequence follow the approved model-specific operating manual.

Internal Cutting vs External Cutting

Internal Cutter	External Washover Cutter
Runs inside the tubular	Runs around the tubular OD
Cuts outward through the pipe wall	Cuts inward from outside
Requires accessible pipe ID	Requires annular clearance around pipe
Can be combined with an internal Spear	Can be combined with an external Overshot
Suitable when the pipe OD is inaccessible	Suitable when the pipe ID is blocked
Selected by tubular ID	Selected by tubular OD and annular clearance

An Internal Cutter is generally selected where the tubular bore is open and external access is limited.

Mechanical Cutter vs Hydraulic Cutter

Mechanical Internal Cutter	Hydraulic Casing Cutter
Blade deployment through mechanical setting	Blade deployment through pump pressure
Simple internal structure	Includes piston, seals and hydraulic ports
No activation-pressure requirement	Requires defined circulation pressure
Cutting controlled by rotation and axial movement	Cutting force generated hydraulically
Lower dependence on hydraulic conditions	Can provide strong controlled radial force
Suitable for conventional work strings	Suitable for advanced single- or multi-string cutting
Mechanical cut indication	Pressure or torque indication may be available

The ND-J is selected where mechanical simplicity and conventional rig operation are priorities.

Mechanical Cutter vs Explosive Cutter

A Mechanical Cutter:

• Does not contain an explosive charge
• Does not require explosive transport
• Does not require radio silence
• Produces a controlled rotary cut
• Can often be inspected and redressed
• Requires access for a rotating work string
• Requires adequate torque and axial control

An explosive cutter can provide rapid severance but involves explosives-handling procedures and can create a less controlled pipe-edge condition.

Mechanical Cutter vs Chemical Cutter

A Mechanical Cutter uses hardened blades and rotation.

A Chemical Cutter uses a reactive chemical jet to sever the tubular.

Mechanical cutting is used where:

• The work string can rotate
• A physical blade cut is acceptable
• Chemical compatibility is uncertain
• A reusable cutting system is preferred
• A Spear or fishing assembly will be run with the cutter

Mechanical Cutter vs Section Mill

Mechanical Internal Cutter	Section Mill
Produces one circumferential cut	Removes a longitudinal casing interval
Used for pipe separation and recovery	Used to expose formation or establish a rock-to-rock barrier
Lower metal-removal volume	High metal-removal volume
Shorter cutting operation	Extended milling operation
Produces one severed pipe section	Produces casing swarf over a selected interval
Used with a Spear for recovery	Used with swarf-management equipment

Tubulars That Can Be Cut

Production Tubing

The cutter can be used to sever:

• NUE Tubing
• EUE Tubing
• Integral-Joint Tubing
• Premium-Connection Tubing
• Production strings
• Injection strings
• Workover tubing

The cutting position must be located on the pipe body, not across an upset, coupling or premium connection.

Drill Pipe

Applications include:

• Stuck Drill Pipe
• Twisted Drill Pipe
• Drill Pipe trapped below a collapsed interval
• Drill Pipe requiring recovery above a stuck BHA

The cut must be positioned away from the Tool Joint because the Tool Joint has greater outside diameter, wall thickness and hardness than the pipe body.

Casing

The tool can cut:

• Production Casing
• Intermediate Casing
• Surface Casing
• Casing Liners
• Cut-and-pull casing sections
• Abandonment casing strings

The cutter model and blades are matched to the casing ID, wall thickness and steel grade.

Why the Cutter Must Avoid Couplings

A tubing coupling, casing coupling or Drill Pipe Tool Joint is:

• Thicker than the pipe body
• Larger in outside diameter
• Often made from higher-strength material
• Frequently heat treated to higher hardness
• Geometrically different from the pipe body

Attempting to cut at a coupling can cause:

• Incomplete cutting
• Cutter-blade breakage
• Excessive torque
• Tool sticking
• Mandrel damage
• Uncontrolled pipe deformation
• Extended milling time
• Inability to retrieve the cutter

The planned cutting depth must therefore be positioned between connections.

Collar Location

The cut position can be verified using:

• Tubular tally
• Pipe-joint length records
• Casing tally
• Completion drawings
• Magnetic Casing Collar Locator
• Mechanical Collar Locator
• Gamma-ray or depth correlation
• Pipe inspection logs
• Known coupling depth references

A Collar Locator is strongly recommended where joint depth is uncertain.

Main Tool Components

The ND-J Mechanical Internal Cutter normally includes:

• Top Sub
• Main Body or Mandrel
• Mechanical Setting Sleeve
• Cutter Arms
• Cutter Blades or Knives
• Blade Pins
• Return Components
• Stops or Travel Limiters
• Lower Guide
• Central Flow Bore
• Retaining Components

The final component arrangement follows the cutter size and approved manufacturing drawing.

Top Sub

The Top Sub connects the cutter to the work string.

It transfers:

• Rotary torque
• Axial tension
• Cutting compression
• Bending load
• Circulation pressure
• Pulling load during recovery

Standard Goldenman models use:

• NC26
• NC31
• NC38
• NC50

Crossover Subs can connect the cutter to another work-string connection.

Main Mandrel

The Main Mandrel provides:

• Structural load capacity
• Internal flow passage
• Blade support
• Mechanical setting geometry
• Torque transfer
• Blade-travel control
• Connection to the Top Sub

The mandrel is manufactured from heat-treated alloy steel and undergoes full-body nondestructive inspection.

Cutter Arms

Cutter Arms transmit mechanical force from the actuation system to the blades.

They must withstand:

• Radial cutting force
• Rotary impact
• Cyclic loading
• Bending
• Vibration
• Abrasive cuttings
• Repeated extension and retraction

Arms are inspected for cracking, deformation and pin-hole wear after each operation.

Cutting Blades

The cutter blades perform the actual pipe-wall cutting.

Available blade structures include:

• Hardened tool-steel cutting edges
• Tungsten-carbide inserts
• Crushed-carbide hardfacing
• Replaceable carbide cutting blocks
• Grade-specific blade profiles

Blade selection is based on:

• Tubular material
• Tubular hardness
• Wall thickness
• Pipe ID
• Required cutting speed
• Expected rotary speed
• Work-string torque
• Fluid environment

Blade Geometry

The blade geometry controls:

• Initial contact with the pipe wall
• Penetration rate
• Cutting stability
• Chip formation
• Blade load distribution
• Finished cut profile
• Resistance to blade chipping

Blades for thinner tubing and blades for heavy-wall casing can use different cutting profiles.

Main Body Materials

The main body can be manufactured from:

• AISI 4140 alloy steel
• AISI 4145H Modified
• AISI 4330
• Equivalent quenched-and-tempered fishing-tool steel

The selected material provides:

• High torsional capacity
• High tensile strength
• Impact toughness
• Fatigue resistance
• Stable heat-treatment response
• Resistance to shock loading

Cutting-Blade Materials

Blade materials include:

• Heat-treated tool steel
• Carburized alloy steel
• Tungsten-carbide insert material
• Carbide hardfacing in a nickel-alloy matrix
• High-wear-resistant project materials

The cutting edge requires high hardness while the blade body retains sufficient toughness to resist fracture.

Standard-Service Configuration

The standard configuration supports operation with:

• Water-Based Mud
• Oil-Based Mud
• Synthetic-Based Mud
• Completion brine
• Fresh water
• Seawater
• Workover fluid

Tool material and coating are selected according to the expected fluid and storage environment.

Sour-Service Configuration

A sour-service cutter can include:

• Controlled-hardness alloy-steel body
• H₂S-compatible materials
• Controlled heat treatment
• Hardness mapping
• Corrosion-resistant internal components
• Full material traceability
• Project-specific NDE

The complete fishing assembly must be assessed for H₂S exposure and applied stress.

Typical Standalone Cutting BHA

A standalone BHA can include:

1. ND-J Mechanical Internal Cutter
2. Crossover Sub
3. Fishing Bumper Sub
4. Mechanical or Hydraulic Fishing Jar
5. Jar Intensifier
6. Heavy Weight Drill Pipe
7. Drill Pipe or work string

The actual assembly depends on well geometry, tubular size and recovery strategy.

One-Trip Cut-and-Pull BHA

A one-trip recovery assembly can include:

1. Work String
2. Safety Joint
3. Fishing Jar
4. Bumper Sub
5. Releasing Casing Spear
6. Spacer Sub
7. ND-J Mechanical Internal Cutter
8. Lower Guide

The arrangement allows the pipe to be:

• Cut at the selected depth
• Internally gripped
• Pulled under controlled load
• Jarred if required
• Released if recovery is unsuccessful

The Spear catching range, cutter OD, cutting depth and relative spacing must be defined in the approved BHA drawing.

Cutter Combined with a Releasing Spear

The cutter-and-Spear combination provides:

• Reduced number of trips
• Faster recovery of the cut pipe
• Positive internal pipe engagement
• Controlled overpull
• Jarring capability
• Ability to release from unrecoverable casing
• Improved offshore operational efficiency

The Spear is normally positioned to grip a structurally sound section of pipe above the cut.

Cutter Combined with a Fishing Jar

A Fishing Jar can be used after cutting to free the severed tubular.

The jarring program considers:

• Spear working load
• Cutter connection capacity
• Cut-pipe weight
• Cement bond
• Differential sticking
• Work-string stretch
• Maximum rig overpull
• Wellhead load limit

The cutter itself is not used as the primary jarring component.

Cutter Combined with a Bumper Sub

A Bumper Sub provides controlled axial movement for:

• Setting the cutter
• Maintaining cutting load
• Unloading the blades
• Supporting Spear release
• Managing work-string movement

Cutter Combined with a Safety Joint

A Safety Joint provides a controlled secondary release point if the cutter, Spear or severed pipe becomes stuck.

The release direction must be compatible with the cutter and Spear operating directions.

Pre-Job Engineering

The cutting program must establish:

• Tubular OD
• Tubular ID
• Wall thickness
• Steel grade
• Connection locations
• Cutting depth
• Well inclination
• Dogleg severity
• Fluid condition
• Available rotation
• Available torque
• Available axial load
• Work-string size
• Fish length and suspended weight
• Recovery method after cutting
• Well-control requirements
• Debris-management plan

Model Selection

The correct cutter is selected using the narrowest internal restriction through which the tool must pass.

Selection inputs include:

• Minimum tubular ID
• Maximum target-pipe ID
• Drift diameter
• Connection ID
• Internal scale
• Cement deposits
• Pipe deformation
• Tool outside diameter
• Expanded blade range
• Work-string connection
• Required circulation bore

The cutter must have sufficient running clearance while providing enough blade travel to reach and cut the pipe wall.

Pipe Grade Selection

Cutting performance changes with pipe grade.

Common tubular grades include:

• J55
• K55
• N80
• L80
• P110
• Q125
• S135 Drill Pipe
• Alloy completion tubing
• Chromium tubing
• Corrosion-resistant alloys

Higher-strength and corrosion-resistant materials can require:

• Different blade material
• Reduced penetration per revolution
• Higher torque capacity
• Additional cutting time
• Alternative cutter technology

Wall-Thickness Selection

The wall thickness determines:

• Cutting depth
• Blade travel
• Required cutting energy
• Cutting time
• Chip volume
• Blade wear
• Risk of incomplete separation

The quotation must state nominal weight or actual wall thickness, not only nominal pipe OD.

Well-Deviation Assessment

In deviated and horizontal wells, the cutter can experience:

• Increased side load
• Work-string drag
• Uneven blade loading
• Reduced weight transfer
• Torsional friction
• Debris settling
• Difficulty confirming tool movement

BHA centralization, work-string stiffness and circulation must be reviewed for high-angle applications.

Pre-Run Inspection

Before running:

1. Verify cutter model and serial number.
2. Confirm tubular ID and wall thickness.
3. Confirm the cut is located away from a coupling.
4. Inspect the Top Sub and rotary connection.
5. Gauge the connection.
6. Inspect the mandrel.
7. Inspect all Cutter Arms.
8. Inspect cutter blades.
9. Verify pins and retainers.
10. Confirm blade extension and retraction.
11. Verify the central bore is clear.
12. Confirm the operating direction.
13. Record blade and arm dimensions.
14. Confirm the spare-blade package.
15. Review the approved operating program.

Running Procedure

1. Assemble the cutter into the approved BHA.
2. Apply the specified connection makeup torque.
3. Run to a depth above the planned cut.
4. Establish depth correlation.
5. Confirm the nearest coupling positions.
6. Circulate and clean the internal pipe bore.
7. Lower the cutter to cutting depth.
8. Mechanically set the cutter.
9. Apply the specified axial cutting load.
10. Begin rotation at the approved speed.
11. Monitor torque, weight and circulation.
12. Continue cutting until complete separation is indicated.
13. Stop rotation.
14. Unload and retract the blades.
15. Confirm that the tool can move freely.
16. Recover the cutter or proceed with pipe recovery.

Exact operating parameters are established by the cutter model, tubular material and approved job procedure.

Monitoring During Cutting

Surface indications include:

• Rotary torque
• Hook load
• Weight on tool
• Standpipe pressure
• Rotation speed
• Penetration or axial movement
• Metal cuttings in returns
• Vibration
• Change in torque after separation

Sudden excessive torque can indicate:

• Blade overload
• Cutting at a coupling
• Broken blade
• Incorrect setting
• Tool-body contact
• Excessive axial loading

Confirming a Complete Cut

A complete cut can be indicated by:

• Change or reduction in rotary torque
• Change in hook load
• Increased axial movement
• Movement of the upper tubular section
• Circulation response
• Successful controlled pull on the cut section
• Free movement across the cutting depth

Cut confirmation must distinguish complete separation from partial wall penetration.

Debris Management

Cutting produces metallic chips and fragments.

The cleanup program can include:

• Continuous circulation
• Junk Basket
• Reverse-Circulating Junk Basket
• Fishing Magnet
• Ditch Magnet
• Surface solids monitoring
• High-viscosity sweep
• Clean completion fluid

Cuttings management reduces the risk of:

• Tool sticking
• Valve blockage
• Damage to completion equipment
• Debris remaining above a permanent barrier

Common Applications

Goldenman ND-J Internal Cutters are used in:

• Stuck Tubing recovery
• Stuck Drill Pipe recovery
• Casing recovery
• Liner recovery
• Completion-string removal
• Workover operations
• Plug-and-abandonment operations
• Platform slot recovery
• Sidetrack preparation
• Wellhead and casing removal
• Damaged tubular replacement
• Offshore conductor and casing recovery

Plug-and-Abandonment Operations

During P&A work, the cutter can separate:

• Production Tubing
• Production Casing
• Intermediate Casing
• Surface Casing
• Casing Liners
• Completion assemblies

The cut location is coordinated with:

• Permanent barrier depth
• Cement placement
• Annular isolation
• Casing-recovery requirements
• Section-milling program
• Wellhead removal
• Regulatory requirements

Platform Slot Recovery

Slot-recovery operations can require removal of existing casing so that the slot can be reused.

An internal cutter and Spear assembly supports:

• Controlled casing severance
• One-trip engagement
• Recovery of free casing sections
• Reduction of rig time
• Recovery above stuck or cemented intervals
• Multiple staged cut-and-pull operations

Common Failure Modes

Cutter Does Not Reach Target Depth

Possible causes include:

• Internal scale
• Cement restriction
• Collapsed pipe
• Tool OD too large
• Deformed coupling
• Incorrect model selection
• Debris inside the tubular

Blades Do Not Expand

Possible causes include:

• Incorrect setting movement
• Packed debris
• Damaged Cutter Arms
• Broken pins
• Worn cam or setting surface
• Mechanical obstruction
• Incorrect assembly

Excessive Cutting Torque

Possible causes include:

• Cutting across a coupling
• Excessive axial loading
• Incorrect blade profile
• High-strength pipe
• Blade damage
• Inadequate circulation
• Tool misalignment

Incomplete Cut

Possible causes include:

• Insufficient blade travel
• Worn blades
• Incorrect pipe-wall thickness
• Inadequate rotation
• Uneven axial loading
• Bent tubular
• Cutting at an upset
• Premature tool retraction

Blade Breakage

Possible causes include:

• Cutting a coupling or Tool Joint
• Excessive weight on tool
• Excessive rotational speed
• Hard pipe material
• Impact loading
• Poor blade heat treatment
• Reusing a damaged blade

Cutter Cannot Retract

Possible causes include:

• Metal chips behind the arms
• Bent Cutter Arm
• Broken return component
• Excessive blade penetration
• Mechanical deformation
• Cutting debris packed around the tool

Tool Becomes Stuck

Possible causes include:

• Incomplete blade retraction
• Large metal cuttings
• Collapsed pipe
• Excessive debris
• Differential sticking
• Unsupported severed pipe movement
• Incorrect BHA design

Post-Run Inspection

After each cutting operation:

• Clean the complete tool
• Remove all metallic debris
• Disassemble the blade assembly
• Inspect Cutter Arms
• Inspect blade pins
• Inspect cutting edges
• Inspect mechanical setting surfaces
• Inspect the mandrel
• Inspect the central bore
• Inspect the Top Sub
• Gauge the connection
• Perform MPI on critical areas
• Replace worn blades
• Replace damaged pins and retainers
• Function-test extension and retraction
• Apply corrosion protection
• Install thread protectors

Manufacturing Process

Goldenman ND-J Cutter manufacturing includes:

1. Alloy-steel material verification
2. Heat-number assignment
3. Forging ultrasonic inspection
4. Rough machining
5. Quenching and tempering
6. Mechanical-property testing
7. Mandrel finish machining
8. Internal-bore machining
9. Setting-profile machining
10. Top-connection machining
11. Connection gauging
12. Cutter-Arm manufacturing
13. Cutter-blade manufacturing
14. Blade heat treatment
15. Carbide or hardfacing application
16. Cutting-edge inspection
17. Pin and retainer manufacturing
18. Tool assembly
19. Blade-travel inspection
20. Extension and retraction testing
21. Dimensional inspection
22. UT and MPI
23. Functional testing
24. Surface treatment
25. Permanent marking
26. Documentation review
27. Export packaging

Quality Control and Testing

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 testing
• Blade-hardness testing
• Full-body ultrasonic inspection
• Body magnetic-particle inspection
• Cutter-Arm MPI
• Blade MPI
• Tool-OD inspection
• Internal-bore inspection
• Concentricity inspection
• Blade-travel inspection
• Pin and retainer inspection
• Connection-thread inspection
• API rotary-shouldered gauge inspection
• Extension testing
• Retraction testing
• Functional rotation testing
• Project-specific cutting test
• Final visual inspection

Connection Inspection

NC connections are inspected for:

• Thread form
• Thread taper
• Lead
• Pitch diameter
• Thread height
• Crest and root condition
• Pin nose
• Box counterbore
• Shoulder flatness
• Shoulder perpendicularity
• Gauge standoff
• Surface finish
• Connection concentricity

NC connection conformity does not constitute API certification of the complete cutter.

Product Marking

Each cutter is permanently marked with:

• Goldenman identification
• ND-J model
• Tool outside diameter
• Target tubular ID range
• Nominal tubular size
• Top connection
• Heat number
• Serial number
• Manufacturing date

Replacement blades are identified by matching cutter model and cutting range.

Product Documentation

The documentation package includes:

• Certificate of Conformity
• Product datasheet
• General assembly drawing
• Dimensional drawing
• Blade-extension drawing
• Material certificate
• EN 10204 3.1 certificate
• Chemical-composition report
• Heat-treatment record
• Mechanical-property report
• Hardness report
• Impact-test report
• Ultrasonic-inspection report
• Magnetic-particle-inspection report
• Connection-gauge report
• Dimensional inspection report
• Blade-travel inspection report
• Extension-and-retraction test report
• Functional test report
• Project cutting-test report where ordered
• Heat and component traceability list
• Operation and maintenance manual
• Recommended spare-parts list
• Packing list
• Third-party inspection report

Replacement Parts and Redress Kits

Goldenman supplies:

• Complete cutter-blade sets
• Individual cutter blades
• Cutter Arms
• Blade pins
• Retaining pins
• Return springs
• Setting sleeves
• Cam components
• Travel stops
• Lower guides
• Top Subs
• Crossover Subs
• Thread protectors
• Complete redress kits

Frequently Asked Questions

What product is shown on this page?

This page covers the Goldenman ND-J Mechanical Internal Cutter for cutting casing, tubing and Drill Pipe from inside the tubular bore.

Is this a hydraulic cutter?

No.

The ND-J is a mechanically actuated rotary internal cutter.

What sizes are available?

The standard Goldenman range covers:

• 4-1/2 in
• 5 in
• 5-1/2 in
• 6-5/8 in
• 7 in
• 9-5/8 in

What are the standard connections?

The standard models use:

• NC26
• NC31
• NC38
• NC50

Can the cutter cut at a casing or tubing coupling?

No.

The cut should be positioned on the pipe body away from couplings, upsets and Drill Pipe Tool Joints.

How is the coupling position identified?

The cutting depth can be correlated using the pipe tally, completion records or a Casing Collar Locator.

Can the cutter cut Drill Pipe?

Yes.

The model and blade package must match the Drill Pipe body ID, wall thickness and steel grade.

The cut must not be positioned across a Tool Joint.

Can the cutter cut P110 or high-strength casing?

High-strength pipe can be cut with the correct blade, operating parameters and torque capacity.

The pipe grade and wall thickness must be supplied during quotation.

Can it cut chrome or corrosion-resistant tubing?

The material grade must be reviewed because chromium and corrosion-resistant alloys can require specialized carbide blades or an alternative cutting method.

Can it be used with a Casing Spear?

Yes.

The cutter can be combined with a Releasing Casing Spear for one-trip cut-and-pull recovery.

Can it be used with a Fishing Jar?

Yes.

A Fishing Jar, Jar Intensifier and Bumper Sub can be installed in the recovery assembly.

Does the cutter remove a complete casing section?

No.

The Internal Cutter creates one circumferential cut.

A Section Mill removes a longitudinal interval of casing.

Does the cutter require circulation?

Circulation is used to cool the cutting area and transport metal cuttings away from the tool.

How is a complete cut confirmed?

Cut confirmation can be obtained from torque, hook-load and axial-movement changes, followed by a controlled pull or movement test.

Are cutter blades replaceable?

Yes.

Goldenman supplies replacement blade sets, Cutter Arms, pins and complete redress kits.

Is the complete cutter API certified?

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

It does not certify the complete cutter, cutting mechanism or cutting performance.

What testing is available?

Available inspection and testing includes:

• Material testing
• UT
• MPI
• Thread gauging
• Dimensional inspection
• Blade-extension testing
• Blade-retraction testing
• Functional testing
• Project-specific cutting tests

Information Required for Quotation

Please provide:

• Tubular type
• Tubing, Drill Pipe, Casing or Liner
• Nominal tubular OD
• Nominal weight
• Wall thickness
• Minimum tubular ID
• Maximum tubular ID
• Tubular grade
• Tubular connection
• Coupling or Tool Joint depths
• Planned cutting depth
• Well depth
• Well inclination
• Maximum dogleg severity
• Work-string type
• Required top connection
• Available internal bore
• Available rotary speed
• Available operating torque
• Available axial cutting load
• Circulation-fluid type
• Circulation rate
• Maximum operating temperature
• H₂S concentration
• CO₂ concentration
• Standalone cutting or cut-and-pull operation
• Casing Spear requirement
• Fishing Jar requirement
• Bumper Sub requirement
• Jar Intensifier requirement
• Safety Joint requirement
• Junk Basket requirement
• Fishing Magnet requirement
• Cutter-blade material
• Spare-blade quantity
• Redress-kit requirement
• NDE requirements
• Cutting-test requirement
• Third-party inspection
• Documentation requirements
• Required quantity
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies ND-J Mechanical Internal Cutters for cutting and recovering tubing, Drill Pipe, casing and liner strings during fishing, workover and abandonment operations.

The standard range includes:

• ND-J114 for 4-1/2 in tubulars
• ND-J127 for 5 in tubulars
• ND-J140 for 5-1/2 in tubulars
• ND-J168 for 6-5/8 in tubulars
• ND-J178 for 7 in tubulars
• ND-J245 for 9-5/8 in tubulars
• NC26, NC31, NC38 and NC50 connections
• Replaceable hardened cutter blades
• Standalone cutting assemblies
• One-trip cut-and-pull systems
• Releasing Casing Spears
• Fishing Jars, Bumper Subs and Safety Joints
• Replacement blades and complete redress kits

Complete tools are supplied with material traceability, mechanical-property records, UT and MPI reports, connection-gauge inspection, dimensional verification and functional-test documentation.

Email: info@goldenman.com