Rotary and Reciprocating Casing Scrapers for Wellbore Cleanup

Description

Goldenman GX Series Full-Circle Casing Scrapers remove cement, mud cake, rust, scale, paraffin, perforation burrs, embedded debris and other deposits from the inside wall of casing and tubing.

The scraper is installed in the drill string, work string or cleanout assembly and can be operated through:

• Vertical reciprocation
• Controlled rotation
• Simultaneous rotation and reciprocation
• Circulation-assisted mechanical cleaning
• Multiple passes across critical setting depths

Spring-loaded blades remain in contact with the casing ID while allowing the tool to pass through internal diameter changes, casing joints and localized restrictions.

The standard Goldenman range includes eleven models from GX89 to GX273, with scraping ranges extending from 3-1/2-inch casing to internal diameters of 259 mm.

The tool prepares clean casing surfaces for:

• Production Packers
• Retrievable Packers
• Permanent Packers
• Bridge Plugs
• Cement Retainers
• Casing Patches
• Liner Hangers
• Tieback Packers
• Polished-Bore Receptacles
• Casing Spears
• Fishing Tools
• Wireline Tools
• Logging Tools
• Sand-Screen Completions
• Well-Abandonment Equipment

Product Short Description

Goldenman Full-Circle Casing Scrapers use multiple spring-loaded tool-steel blades arranged around a one-piece alloy-steel mandrel.

The blades expand outward against the casing wall and maintain cleaning contact while the tool is reciprocated or rotated. Long tapered blade ends allow the assembly to pass through casing joints and internal restrictions without abrupt blade loading.

Large flow passages around the blade assembly permit circulation of drilling fluid, completion brine or chemical cleaning fluid while loosened cement, rust, scale and debris are transported out of the well.

The GX Series is supplied with API Regular, NC rotary-shouldered connections and 1.900 NUE tubing connections according to tool size.

Product Highlights

• Full-circle casing cleaning coverage
• GX89 through GX273 standard models
• Scraping ranges up to 259 mm casing ID
• Suitable for 3-1/2–10-3/4 in casing classes
• Rotary and reciprocating operation
• One-piece alloy-steel mandrel
• Spring-loaded replaceable scraper blades
• Multiple blades distributed around the complete circumference
• Long tapered blade entry and exit profiles
• Continuous blade contact through casing-ID variation
• Large debris and fluid bypass area
• Removal of cement, mud cake and drilling solids
• Removal of rust, mill scale and corrosion products
• Removal of paraffin and production deposits
• Removal of perforation burrs and embedded debris
• Preparation of packer and bridge-plug setting areas
• API Regular and NC rotary-shouldered connections
• 1.900 NUE tubing connection
• Box-up and pin-down connection configurations
• Heat-treated tool-steel blades
• High-strength quenched-and-tempered mandrel
• Replaceable blades, springs and retainers
• Material and heat-number traceability
• Thread-gauge inspection
• UT and MPI inspection
• Dimensional and functional testing
• Complete spare-parts packages

General Technical Specifications

Parameter	Available Configuration
Product	Full-Circle Casing Scraper
Series	GX
Standard models	GX89–GX273
Main function	Mechanical cleaning of casing and tubing ID
Operating methods	Reciprocating, rotating or combined operation
Standard casing coverage	3-1/2–10-3/4 in casing classes
Standard scraping range	Up to 259 mm internal diameter
Body construction	One-piece alloy-steel mandrel
Blade construction	Spring-loaded replaceable tool-steel blades
Blade arrangement	Full-circle circumferential coverage
Blade profile	Double-tapered scraping profile
Connection types	NUE, API Regular and NC
Connection standards	API Spec 5B and API Spec 7-2
Standard tool bore	10–57 mm
Standard overall length	825–1,500 mm
Circulation	Full circulation through central bore and external bypass
Mandrel material	High-strength alloy steel
Blade material	Heat-treated alloy tool steel
Spring material	High-fatigue spring steel
Service	Drilling, completion, workover and abandonment
Inspection	Dimensional, thread, UT, MPI and functional inspection
Supply	Complete tool, blade kits and overhaul kits

GX Series Model Specifications

Model	Mandrel OD	Maximum Blade OD	Minimum Blade OD	Connection	Tool ID	Scraping Range	Overall Length
GX89	60 mm	81 mm	60.2 mm	1.900 NUE	10 mm	3-1/2 in casing, 7.7–15.5 lb/ft	825 mm
GX114	92 mm	111 mm	92 mm	2-3/8 REG	24 mm	96–104 mm	880 mm
GX127	103 mm	121 mm	103 mm	2-3/8 REG	24 mm	106–116 mm	880 mm
GX140	110 mm	133 mm	115 mm	NC31	24 mm	117–128 mm	1,000 mm
GX146	110 mm	139 mm	120 mm	NC31	24 mm	122–134 mm	1,000 mm
GX168	130 mm	162 mm	137 mm	3-1/2 REG	24 mm	140–156 mm	1,150 mm
GX178	136 mm	170 mm	146 mm	3-1/2 REG	30 mm	148–166 mm	1,150 mm
GX194	136 mm	186 mm	162 mm	3-1/2 REG	30 mm	165–180 mm	1,200 mm
GX219	142 mm	212 mm	185 mm	4-1/2 REG	57 mm	191–206 mm	1,400 mm
GX245	200 mm	238 mm	210 mm	4-1/2 REG	57 mm	216–231 mm	1,500 mm
GX273	228 mm	268 mm	237 mm	6-5/8 REG	57 mm	242–259 mm	1,500 mm

The scraper model is selected from the actual casing drift ID, nominal weight, wall thickness and minimum restriction rather than casing OD alone.

What Is a Casing Scraper?

A Casing Scraper is a mechanical wellbore-cleaning tool used to condition the internal surface of casing or tubing.

The tool removes materials that can prevent other equipment from:

• Passing through the casing
• Reaching the planned setting depth
• Anchoring against the casing wall
• Establishing a pressure seal
• Releasing after operation
• Rotating or moving freely
• Obtaining reliable logging data
• Engaging damaged tubulars during fishing

A casing scraper does not normally enlarge undamaged casing. Its function is to restore the effective casing ID by removing deposits and protruding material.

Contaminants Removed

Cement

Residual cement can remain inside the casing after:

• Primary cementing
• Squeeze cementing
• Cement-retainer operations
• Plug cementing
• Casing repair
• Drilling out cement accessories

The scraper removes thin cement sheaths, ridges and localized deposits left on the casing wall.

Mud Cake

Drilling mud and solids can adhere to the casing ID during drilling, circulation and completion-fluid displacement.

Mud cake can interfere with:

• Packer elastomer sealing
• Slip engagement
• Bridge-plug anchoring
• Wireline-tool passage
• Completion-fluid cleanliness

Rust and Mill Scale

Corrosion products and mill scale can detach during completion operations and block small clearances or sealing surfaces.

Mechanical scraping loosens unstable scale before sensitive completion equipment is run.

Paraffin and Wax

Production tubing and casing can accumulate paraffin, wax and heavy hydrocarbon deposits.

The scraper breaks and removes mechanically bonded deposits during workover and production-restoration operations.

Perforation Burrs

Perforating creates sharp burrs and protrusions around perforation holes.

These burrs can damage:

• Packer elastomers
• Bridge-plug seals
• Sand-screen components
• Wireline tools
• Completion strings

Scraping conditions the perforated interval and removes loose metallic edges.

Embedded Debris

The blades can dislodge:

• Bullet fragments
• Perforating debris
• Metal shavings
• Scale flakes
• Cement fragments
• Sand deposits
• Small foreign objects attached to the casing wall

Full-Circle Blade Arrangement

The blade assembly places multiple scraping edges around the complete circumference of the tool.

This arrangement provides:

• Continuous circumferential casing contact
• Cleaning at every tool orientation
• Reduced dependence on gravity
• Effective operation in deviated wells
• Effective operation in horizontal wells
• Even radial cleaning force
• Reduced uncleaned strips
• Improved preparation of packer-setting areas

The overlapping blade arrangement allows multiple cleaning edges to pass over each section of casing during one tool movement.

One-Piece Mandrel

The main mandrel is manufactured from a single alloy-steel body.

The mandrel transfers:

• Axial tensile load
• Axial compression
• Rotary torque
• Bending load
• Hydraulic pressure
• Connection load

One-piece construction provides:

• No body connection in the scraping section
• High torsional capacity
• High tensile capacity
• Reduced leak paths
• Controlled concentricity
• Simple assembly
• Reliable downhole operation

Precision-machined blade pockets maintain the correct position and radial movement of each blade.

Spring-Loaded Blades

Each blade is forced outward by a spring or spring assembly.

The spring system allows the blade to:

• Maintain casing-wall contact
• Retract through restrictions
• Expand into larger casing ID
• Pass through casing joints
• Compensate for blade wear
• Adapt to ovality and local ID variation
• Maintain cleaning force in deviated wells

Spring force is balanced to provide effective scraping without excessive casing-wall loading.

Blade Profile

The scraper blades use tapered leading and trailing ends.

The taper provides:

• Smooth entry into restrictions
• Reduced risk of hanging on coupling recesses
• Controlled blade compression
• Smooth passage through casing-ID transitions
• Bidirectional scraping
• Reduced impact loading
• Improved blade life

The blade body contains multiple scraping edges for cutting and lifting deposits from the casing wall.

Blade Materials

Blades are manufactured from heat-treated alloy tool steel.

The material provides:

• High surface hardness
• Edge retention
• Impact resistance
• Wear resistance
• Fatigue resistance
• Resistance to blade chipping
• Stable spring loading

Available blade treatments include:

• Through hardening
• Surface hardening
• Nitriding
• Carbide reinforcement
• Wear-resistant coating
• Corrosion-resistant surface treatment

The blade material and hardness are selected according to the casing material, deposit type and planned operating mode.

Mandrel Materials

Standard mandrels use high-strength alloy steel, including:

• AISI 4140
• AISI 4145H Modified
• Equivalent quenched-and-tempered alloy steel
• Sour-service-controlled alloy steel
• High-toughness low-temperature material

The mandrel receives controlled heat treatment to obtain:

• Tensile strength
• Yield strength
• Impact toughness
• Torsional capacity
• Fatigue resistance
• Stable machining properties

Fluid and Debris Bypass

The spaces between the blade assemblies provide external flow paths around the tool.

The central bore and external bypass support:

• Drilling-fluid circulation
• Completion-brine circulation
• Chemical cleaning
• Transport of loosened debris
• Hole cleaning
• Pressure equalization
• Reduced packoff risk
• Reduced equivalent circulating density

The tool OD, blade arrangement and circulation rate are selected to preserve sufficient annular bypass area.

Rotary Scraping

During rotary operation, the blades move circumferentially across the casing wall.

Rotary scraping provides:

• Full circumferential cleaning
• Removal of hard bonded deposits
• Effective perforation-burr conditioning
• Repeated blade contact
• Improved scale removal
• Cleaning of localized cement ridges

The operating program controls:

• Rotary speed
• Tool tension or compression
• Circulation rate
• Number of passes
• Contact duration
• Torque response
• Debris returns

Reciprocating Scraping

During reciprocating operation, the tool moves vertically through the target interval.

Reciprocation provides:

• Cleaning along the full interval length
• Controlled contact through casing-ID changes
• Low-torque operation
• Reduced rotational wear
• Effective cleaning where rotation is restricted
• Confirmation of clear passage

The first cleaning pass can be completed by reciprocating through the interval before controlled rotation is introduced.

Combined Rotary and Reciprocating Cleaning

Combined operation provides the highest cleaning coverage.

A typical sequence includes:

1. Circulate clean fluid through the work string.
2. Pass the scraper through the target interval without rotation.
3. Reciprocate across the complete cleaning zone.
4. Begin controlled rotation.
5. Rotate while moving the scraper through the interval.
6. Circulate loosened debris to surface.
7. Repeat passes until torque, drag and returns stabilize.
8. Validate the casing ID using a drift, gauge or cleanup verification tool.

Packer-Setting Preparation

Packers require a clean and uniform casing surface for:

• Elastomer sealing
• Slip engagement
• Anchor contact
• Pressure isolation
• Reliable retrieval

Cement ridges, scale and perforation burrs can cause:

• Seal bypass
• Slip damage
• Incomplete setting
• Packer movement
• Premature elastomer damage
• Retrieval difficulty

The scraper is positioned to clean the complete packer-setting interval plus an additional allowance above and below the planned depth.

Bridge-Plug and Cement-Retainer Preparation

Bridge Plugs and Cement Retainers require a clean casing wall for slips and sealing elements.

Casing scraping improves:

• Slip penetration
• Seal contact
• Setting-force distribution
• Pressure-test reliability
• Tool retrieval
• Cement-placement control

Casing-Patch Preparation

A Casing Patch requires a clean surface around the damaged interval.

The scraper removes:

• Corrosion scale
• Cement deposits
• Loose metal
• Burrs
• Production deposits

This supports consistent patch sealing and anchoring.

Fishing-Tool Preparation

Casing Spears and internal gripping tools require direct contact with the tubular wall.

Cleaning removes material that can prevent:

• Slip engagement
• Grapple contact
• Tool release
• Load transfer
• Correct tool positioning

Wireline and Logging Preparation

A clean casing ID reduces the risk of:

• Gauge hang-up
• Logging-tool obstruction
• Plug damage
• Wireline damage
• Incorrect depth correlation
• Tool sticking

The scraper can be included in a dedicated cleanup assembly before wireline, slickline or electric-line operations.

Sand-Screen Completion Preparation

Before running sand screens and lower-completion equipment, casing cleanup removes debris that can:

• Damage screen assemblies
• Restrict tool passage
• Contaminate completion brine
• Prevent packer setting
• Obstruct polished-bore receptacles

Casing Scraper vs Casing Brush

Casing Scraper	Casing Brush
Uses rigid or semi-rigid steel blades	Uses wire or abrasive brush elements
Removes cement, scale and burrs	Removes light residue and fine debris
Provides aggressive mechanical cleaning	Provides surface polishing
Conditions localized hard deposits	Cleans after scraping
Used before packers and plugs	Used for final surface cleaning

A complete wellbore-cleaning assembly can combine a scraper and brush.

Casing Scraper vs Magnet

A Casing Scraper loosens material attached to the casing wall.

A Downhole Magnet collects ferrous debris after it has been loosened.

The tools can be run together where perforation fragments, metal cuttings or milling debris are expected.

Casing Scraper vs Mill

A scraper removes deposits and burrs from the casing ID.

A mill cuts larger metallic or cement obstructions.

A mill is selected where the restriction cannot be removed safely through spring-loaded blade contact alone.

Casing Scraper vs Drift

A scraper cleans the casing wall.

A drift verifies the minimum available casing ID.

The drift does not provide aggressive cleaning, while the scraper does not replace final dimensional verification.

Standard Connection Types

1.900 NUE

GX89 uses a 1.900-inch Non-Upset Tubing connection.

This connection is manufactured and inspected according to the applicable API tubing-thread requirements.

API Regular Connections

Standard REG connections include:

• 2-3/8 REG
• 3-1/2 REG
• 4-1/2 REG
• 6-5/8 REG

API Regular rotary-shouldered connections transmit drilling torque and axial load through the thread and metal shoulder.

NC Connections

GX140 and GX146 use NC31 rotary-shouldered connections.

Additional NC connections are supplied for custom models and work-string combinations.

Connection Inspection

Rotary-shouldered connection inspection includes:

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

NUE connection inspection includes thread dimensions, taper, lead, height and gauge acceptance for the specified tubing connection.

Tool Orientation

Standard drill-string configurations use:

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

The tool can be installed:

• Above a bit or mill
• Above a junk basket
• Below a circulation tool
• Above a magnet
• Within a dedicated cleanup BHA
• Between work-string components
• In a coiled-tubing cleanout assembly with matched adapters

The final tool orientation follows the approved BHA drawing and connection arrangement.

Vertical-Well Operation

In vertical wells, blade contact is distributed through the spring system around the complete circumference.

Reciprocation and rotation provide uniform cleaning across the selected interval.

Deviated-Well Operation

In deviated wells, the lower side of the casing experiences greater tool contact.

The full-circle spring arrangement maintains blade contact on the high and low sides and compensates for gravity-induced tool position.

Horizontal-Well Operation

Horizontal wells commonly contain:

• Settled solids
• Cement fragments
• Scale
• Perforation debris
• Sand beds

The casing scraper is used with circulation and debris-management tools to loosen material and transport it away from the cleanup interval.

Operating Procedure

Before Running

1. Confirm the casing OD, nominal weight and drift ID.
2. Select the scraper model from the actual casing ID.
3. Verify the top and bottom connections.
4. Measure the mandrel OD.
5. Measure minimum and maximum blade OD.
6. Inspect blade movement.
7. Inspect all springs and retainers.
8. Verify the central bore is clear.
9. Inspect and gauge the connections.
10. Confirm the target cleaning interval.
11. Install the tool in the approved cleanup assembly.

Running in Hole

1. Run the assembly at a controlled speed.
2. Monitor hook load and drag.
3. Circulate when approaching the target interval.
4. Pass through the interval without abrupt force.
5. Record restriction and drag depths.
6. Do not force the tool through an unknown hard obstruction.

Cleaning the Interval

1. Establish the planned circulation rate.
2. Reciprocate through the entire cleaning zone.
3. Monitor torque and hook-load response.
4. Apply controlled rotation.
5. Rotate and reciprocate through the target interval.
6. Circulate loosened debris.
7. Inspect returns at surface.
8. Repeat the cleaning passes.
9. Verify clear passage through the cleaned interval.

Pulling Out of Hole

1. Maintain circulation where required.
2. Pull through the cleaned interval at a controlled rate.
3. Monitor overpull.
4. Avoid excessive rotation in compression.
5. Recover the tool and inspect blade condition.
6. record deposits, wear and damaged components.

Circulation Fluid

The scraper can be operated with:

• Water-Based Mud
• Oil-Based Mud
• Synthetic-Based Mud
• Completion brine
• Seawater
• Fresh water
• Chemical cleaning fluid
• Solvent packages
• Spacer systems

Material compatibility is selected from:

• Fluid base
• Chloride concentration
• pH
• Temperature
• Acid content
• Solvent content
• H₂S
• CO₂
• Solids concentration

Chemical and Mechanical Cleaning

Mechanical scraping can be combined with chemical cleaning to remove:

• Oil-wet mud residue
• Filter cake
• Scale
• Paraffin
• Grease
• Cement film
• Organic deposits

The blades break the deposit surface while circulated chemicals dissolve, disperse or transport the loosened material.

Operating Limits

The permitted rotary speed, axial compression, tensile load and circulation rate are defined for each model and cleanup assembly.

Operating limits account for:

• Scraper size
• Mandrel connection
• Blade extension
• Casing ID
• Casing condition
• Deposit hardness
• Tool position
• BHA stiffness
• Hole inclination
• Fluid density
• Debris loading
• Temperature

The tool is operated within the approved run sheet and connection capacity.

Pre-Run Inspection

Inspection covers:

• Mandrel cracks
• Body corrosion
• Blade-pocket wear
• Blade cracking
• Blade-edge wear
• Spring fatigue
• Retainer condition
• Fastener security
• Minimum blade OD
• Maximum blade OD
• Tool bore
• Pin and box threads
• Connection shoulders
• Product marking

Damaged or seized blades are replaced before running.

Post-Run Inspection

After each run:

• Remove drilling fluid and debris
• Clean blade pockets
• Inspect blade travel
• Measure blade wear
• Inspect spring force
• Inspect retainers
• Inspect the mandrel
• Inspect connections
• Perform MPI on critical areas
• Replace damaged components
• Apply corrosion protection
• Install thread protectors

Blade Replacement

Blade replacement includes:

1. Clean the tool.
2. Compress the blade assembly.
3. Remove the retainer.
4. Remove the worn blade.
5. Inspect the spring and blade pocket.
6. Install the correct replacement blade.
7. Reinstall the retainer.
8. Verify full blade travel.
9. Measure minimum and maximum blade OD.
10. Complete a functional inspection.

Blades are replaced as matched sets where uniform radial cleaning force is required.

Common Failure Modes

Incomplete Cleaning

Causes include:

• Incorrect scraper model
• Insufficient blade extension
• Worn blade edges
• Insufficient passes
• Low spring force
• Inadequate rotation
• Incorrect target depth
• Extremely hard deposits requiring milling

Tool Hangs at a Casing Joint

Causes include:

• Damaged blade taper
• Broken spring
• Incorrect blade size
• Deformed casing
• Collapsed casing
• Excessive running speed
• Internal coupling damage

Blade Breakage

Causes include:

• Impact with a hard obstruction
• Excessive rotary speed
• Excessive axial compression
• Incorrect heat treatment
• Severe blade wear
• Foreign metal trapped behind the blade

Blade Fails to Retract

Causes include:

• Cement packed in the blade pocket
• Scale accumulation
• Damaged spring
• Bent blade
• Corrosion
• Deformed retainer

Excessive Torque

Causes include:

• Oversized scraper
• Hard cement deposit
• Restricted bypass
• Packed debris
• Collapsed casing
• Excessive blade force
• Rotation while heavily compressed

Restricted Circulation

Causes include:

• Debris packoff
• Blocked central bore
• Insufficient external bypass
• Large cement fragments
• High-solids fluid
• Incorrect cleanup assembly

Manufacturing Process

Goldenman Casing Scraper manufacturing includes:

1. Alloy-steel material verification
2. Heat-number assignment
3. Mandrel rough machining
4. Quenching and tempering
5. Mechanical-property testing
6. Full-body ultrasonic inspection
7. Central-bore machining
8. Blade-pocket machining
9. Flow-channel machining
10. Pin and box connection machining
11. Thread gauging
12. Blade casting or forging
13. Blade heat treatment
14. Blade-edge machining
15. Spring production
16. Blade and spring assembly
17. Minimum- and maximum-OD inspection
18. Blade-travel testing
19. Magnetic-particle inspection
20. Dimensional inspection
21. Surface coating
22. Permanent marking
23. Final documentation review
24. Export packaging

Quality Control and Testing

Inspection and testing include:

• Chemical-composition verification
• Heat-treatment verification
• Yield-strength testing
• Tensile-strength testing
• Elongation testing
• Impact testing
• Body-hardness inspection
• Blade-hardness inspection
• Full-body UT
• Mandrel MPI
• Blade MPI
• Mandrel OD inspection
• Tool ID inspection
• Overall-length inspection
• Concentricity inspection
• Minimum blade-OD inspection
• Maximum blade-OD inspection
• Blade-travel inspection
• Spring-force inspection
• Retainer inspection
• Thread-gauge inspection
• Shoulder inspection
• Flow-bypass inspection
• Functional rotation and reciprocation test
• Final visual inspection

Product Marking

Each tool is permanently marked with:

• Goldenman identification
• Product type
• GX model
• Mandrel OD
• Scraping range
• Minimum blade OD
• Maximum blade OD
• Connection type
• Tool bore
• Overall length
• Heat number
• Serial number
• Manufacturing date

Product Documentation

The documentation package includes:

• Certificate of Conformity
• Product datasheet
• General assembly drawing
• Dimensional 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
• Blade-travel inspection report
• Functional inspection report
• Material traceability list
• Operation and maintenance manual
• Recommended spare-parts list
• Packing list
• Third-party inspection report

Replacement Parts

Goldenman supplies:

• Complete scraper-blade sets
• Individual scraper blades
• Inner and outer springs
• Blade retainers
• Lock blocks
• Retainer screws
• Spring seats
• Connection protectors
• Blade-pocket repair components
• Complete overhaul kits

Frequently Asked Questions

What type of Casing Scraper is shown on this page?

This page covers the GX Series Full-Circle Casing Scraper with spring-loaded replaceable blades.

Can the tool be rotated?

Yes.

The scraper supports controlled rotary, reciprocating and combined cleaning operations.

What is the standard size range?

The standard series includes GX89 through GX273.

It covers 3-1/2-inch casing and scraping diameters up to 259 mm.

What materials can the scraper remove?

It removes:

• Cement
• Mud cake
• Rust
• Mill scale
• Paraffin
• Scale
• Perforation burrs
• Embedded metal
• Attached drilling debris

Is this primarily a cementing tool?

No.

It is a wellbore-cleaning and completion-preparation tool. Cement removal is one of its cleaning functions.

Is the complete tool API 7-2 certified?

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

The specification does not certify the complete casing scraper design or scraping performance.

Which connections are available?

The published GX Series includes:

• 1.900 NUE
• 2-3/8 REG
• NC31
• 3-1/2 REG
• 4-1/2 REG
• 6-5/8 REG

Custom connections are available for matched work strings.

Why does GX89 use a different connection standard?

GX89 uses a 1.900 NUE tubing connection.

NUE is a casing-and-tubing thread controlled under the applicable API tubular-thread system, while REG and NC are rotary-shouldered connections.

How is the correct model selected?

The model is selected using:

• Casing OD
• Casing nominal weight
• Actual casing ID
• Minimum drift ID
• Internal restrictions
• Connection
• Work-string size

Can one scraper clean several casing weights?

Yes.

The spring-loaded blade range allows one correctly selected model to cover a defined range of casing IDs.

Can the tool be used in horizontal wells?

Yes.

Full-circle blade coverage and spring loading support cleaning in vertical, deviated and horizontal casing.

Can it be used before setting a packer?

Yes.

Preparing packer-setting areas is one of the principal applications.

Can it remove heavy cement?

The scraper removes cement film, ridges and localized deposits.

Large solid cement obstructions require a mill or drill-out tool before final scraping.

Can it remove perforation burrs?

Yes.

Heat-treated blades condition perforated casing and remove loose or protruding burrs.

Are blades replaceable?

Yes.

Blades, springs, retainers and complete overhaul kits are available separately.

Can it be run with a casing brush?

Yes.

The scraper can be combined with a brush, magnet, junk basket, circulation tool and cleanup-validation tool.

Can it be run on coiled tubing?

A matched small-bore scraper configuration can be supplied for Coiled Tubing or Drill Pipe operation.

How is the tool inspected?

Inspection includes dimensions, blade travel, spring function, thread gauging, UT, MPI and full assembly function testing.

Information Required for Quotation

Please provide:

• Casing OD
• Casing nominal weight
• Casing wall thickness
• Actual casing ID
• Minimum drift ID
• Casing grade
• Target cleaning interval
• Target setting depth
• Deposit type
• Cement, scale, rust, paraffin or perforation burrs
• Vertical, deviated or horizontal well
• Maximum inclination
• Work-string type
• Top connection
• Bottom connection
• Required tool bore
• Circulation rate
• Cleaning-fluid type
• Maximum operating temperature
• H₂S concentration
• CO₂ concentration
• Required rotary operation
• Required reciprocating operation
• Tool position in the cleanup assembly
• Brush requirement
• Magnet requirement
• Junk-basket requirement
• Spare-blade quantity
• Overhaul-kit requirement
• NDE requirements
• Third-party inspection
• Documentation requirements
• Required quantity
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies GX Series Full-Circle Casing Scrapers for drilling, completion, workover, fishing and well-abandonment operations.

The standard range includes:

• GX89 through GX273 models
• Scraping ranges from 3-1/2-inch casing to 259 mm ID
• Rotary and reciprocating operation
• Full-circle spring-loaded blade coverage
• API Regular and NC rotary-shouldered connections
• 1.900 NUE tubing connection
• Replaceable blades, springs and retainers
• Complete cleanup assemblies and spare-parts kits

Complete tools are supplied with material traceability, thread inspection, UT and MPI reports, dimensional inspection and blade-function records.

Email: info@goldenman.com