Casing Heads, Casing Spools and Drilling Spools for Wellhead Systems

Description

Goldenman supplies Casing Head Housings, Casing Spools and Drilling Spools for surface wellhead and pressure-control systems used in oil, gas, geothermal and injection wells.

The product range covers:

• Casing sizes from 7 to 20 inches
• Nominal flange sizes from 2-1/16 to 21-1/4 inches
• Working-pressure classes from 2,000 to 15,000 psi
• Slip-type and mandrel-type Casing Hangers
• Straight-bore wellhead systems
• BT secondary casing seals
• Threaded, flanged and studded side outlets
• Weld-on, threaded and slip-on bottom connections
• Equal-bore and combination-bore Drilling Spools
• PSL, material-class and temperature-class configurations
• Standard and sour-service applications

Each assembly is manufactured according to the specified casing program, pressure class, flange arrangement, suspended load, sealing system, side-outlet configuration and operating environment.

Product Short Description

Goldenman Casing Head Housings form the lower structural and pressure-containing foundation of a surface wellhead.

Casing Spools suspend and seal subsequent casing strings while providing controlled access to the casing annulus.

Drilling Spools provide a pressure-containing connection between Blowout Preventers, wellhead components and drilling-pressure-control equipment, with side outlets for kill, choke, circulation or pressure-monitoring lines.

Complete systems are supplied with matched Casing Hangers, packoffs, Wear Bushings, lockdown screws, secondary seals, test plugs, outlet valves, studs and ring gaskets.

Product Highlights

• API 6A Casing Head and Casing Spool configurations
• API 6A or API 16A Drilling Spool configurations
• Working pressures from 2,000 to 15,000 psi
• Casing sizes from 7 to 20 in
• Flange sizes from 2-1/16 to 21-1/4 in
• Straight-bore wellhead design
• 45-degree Casing Hanger landing shoulder
• Slip-type and mandrel-type Casing Hangers
• Primary and secondary annulus sealing systems
• BT-type secondary casing seals
• Symmetrical lockdown screws
• Replaceable Wear Bushings
• VR preparation for side-outlet isolation
• Flanged, studded and threaded side outlets
• Weld-on, threaded and slip-on bottom connections
• Equal-bore and combination-bore spool designs
• PSL 1, PSL 2, PSL 3 and PSL 3G configurations
• PR1 and PR2 performance options
• Sour-service material configurations
• Hydrostatic body and seal testing
• Material traceability and NDE documentation
• Complete wellhead stack engineering support

Product Range

Casing Head Housing

The Casing Head Housing is installed on the surface casing and forms the lower foundation of the surface wellhead.

Its main functions include:

• Connecting the wellhead to the surface casing
• Supporting an intermediate casing string
• Providing a landing shoulder for the Casing Hanger
• Sealing the annulus around the suspended casing
• Supporting the BOP and upper wellhead equipment
• Providing annulus pressure access through side outlets
• Protecting internal sealing surfaces with a Wear Bushing

Available bottom connections include:

• Weld-on bottom
• Threaded bottom
• Slip-on bottom

Casing Spool

The Casing Spool is installed above the Casing Head Housing or another Casing Spool.

Its main functions include:

• Suspending a subsequent casing string
• Providing a bowl for the Casing Hanger
• Sealing the casing annulus
• Connecting different flange sizes or pressure classes
• Providing access for annulus monitoring and injection
• Supporting the BOP, Tubing Head or next spool
• Providing primary and secondary casing seals

The straight-bore configuration accepts matched slip-type or mandrel-type Casing Hangers.

Drilling Spool

The Drilling Spool is installed in the wellhead or BOP pressure-control stack.

Its main functions include:

• Providing vertical spacing between pressure-control components
• Connecting equal or different flange sizes
• Providing side outlets for kill and choke lines
• Providing circulation and pressure-monitoring access
• Connecting the BOP stack to the wellhead
• Providing a pressure-test boundary
• Adapting bore and flange configurations

Drilling Spools are supplied in API 6A or API 16A configurations according to their position and function in the well-control system.

General Technical Specifications

Parameter	Available Range
Products	Casing Head Housing, Casing Spool and Drilling Spool
Applicable standards	API Spec 6A and API Spec 16A according to equipment function
Working pressure	2,000, 3,000, 5,000, 10,000 and 15,000 psi
Casing sizes	7–20 in
Nominal bore and flange sizes	2-1/16–21-1/4 in
Casing Head top flanges	11, 13-5/8, 16-3/4, 20-1/4, 20-3/4 and 21-1/4 in
Casing Hanger types	Slip type and mandrel type
Body bore	Straight bore
Landing shoulder	45-degree hanger shoulder
Side outlets	Threaded, flanged or studded
Common outlet sizes	2-1/16, 2-9/16, 3-1/8 and 4-1/16 in
Bottom connections	Weld-on, threaded, slip-on or flanged
Secondary seal	BT type and project-specific casing seals
Product Specification Level	PSL 1, PSL 2, PSL 3 and PSL 3G
Performance Requirement	PR1 and PR2
Material classes	AA, BB, CC, DD, EE, FF and HH
Temperature class	API 6A class selected for operating temperature
Sour service	Available for H₂S-containing environments
Testing	Hydrostatic body test, seal test and functional test
Documentation	Material, heat treatment, NDE, dimensional and pressure-test records

Casing Head Housing Size Range

Surface Casing	Top Flange	Working Pressure
7 in	11 in	3,000 psi
8-5/8 in	11 in	2,000, 3,000 and 5,000 psi
9-5/8 in	11 in	2,000, 3,000, 5,000 and 10,000 psi
9-5/8 in	13-5/8 in	5,000 psi
10-3/4 in	11 in	2,000, 3,000, 5,000 and 10,000 psi
11-3/4 in	13-5/8 in	2,000, 3,000 and 5,000 psi
11-3/4 in	16-3/4 in	3,000 and 5,000 psi
12-3/4 in	13-5/8 in	5,000 psi
13-3/8 in	13-5/8 in	2,000, 3,000 and 5,000 psi
13-3/8 in	16-3/4 in	3,000 and 5,000 psi
16 in	16-3/4 in	2,000, 3,000 and 5,000 psi
20 in	20-1/4 in	2,000 psi
20 in	20-3/4 in	3,000 psi
20 in	21-1/4 in	2,000 psi

Reference Casing Head Dimensions

Casing and Flange Configuration	Working Pressure	Body Height A	Bore B	Flange Reference C
7 × 11 in	3,000 psi	470 mm	162 mm	280 mm
8-5/8 × 11 in	2,000 psi	450 mm	203 mm	280 mm
8-5/8 × 11 in	3,000 psi	470 mm	203 mm	280 mm
8-5/8 × 11 in	5,000 psi	500 mm	203 mm	280 mm
9-5/8 × 11 in	2,000 psi	450 mm	230 mm	280 mm
9-5/8 × 11 in	3,000 psi	470 mm	230 mm	280 mm
9-5/8 × 11 in	5,000 psi	500 mm	230 mm	280 mm
9-5/8 × 11 in	10,000 psi	540 mm	230 mm	280 mm
9-5/8 × 13-5/8 in	5,000 psi	490 mm	230 mm	350 mm
10-3/4 × 11 in	2,000 psi	450 mm	259 mm	280 mm
10-3/4 × 11 in	3,000 psi	470 mm	259 mm	280 mm
10-3/4 × 11 in	5,000 psi	500 mm	259 mm	280 mm
10-3/4 × 11 in	10,000 psi	560 mm	255 mm	280 mm
11-3/4 × 13-5/8 in	2,000 psi	470 mm	279 mm	350 mm
11-3/4 × 13-5/8 in	3,000 psi	470 mm	279 mm	350 mm
11-3/4 × 13-5/8 in	5,000 psi	520 mm	279 mm	350 mm
11-3/4 × 16-3/4 in	3,000 psi	444 mm	279 mm	422 mm
11-3/4 × 16-3/4 in	5,000 psi	457 mm	279 mm	422 mm
12-3/4 × 13-5/8 in	5,000 psi	520 mm	312 mm	350 mm
13-3/8 × 13-5/8 in	2,000 psi	470 mm	318 mm	350 mm
13-3/8 × 13-5/8 in	3,000 psi	470 mm	318 mm	350 mm
13-3/8 × 13-5/8 in	5,000 psi	520 mm	318 mm	350 mm
13-3/8 × 16-3/4 in	3,000 psi	470 mm	318 mm	425 mm
13-3/8 × 16-3/4 in	5,000 psi	520 mm	318 mm	425 mm
16 × 16-3/4 in	2,000 psi	445 mm	386 mm	425 mm
16 × 16-3/4 in	3,000 psi	445 mm	386 mm	425 mm
16 × 16-3/4 in	5,000 psi	457 mm	386 mm	425 mm
20 × 20-1/4 in	2,000 psi	490 mm	482 mm	510 mm
20 × 20-3/4 in	3,000 psi	490 mm	482 mm	527 mm
20 × 21-1/4 in	2,000 psi	490 mm	482 mm	540 mm

Casing Spool Configurations

Goldenman Casing Spools are available in equal-flange and combination-flange designs.

Typical configurations include:

Lower Connection	Upper Connection	Working Pressure
11 in flange	11 in flange	2,000–10,000 psi
11 in flange	13-5/8 in flange	2,000–10,000 psi
13-5/8 in flange	11 in flange	3,000–10,000 psi
13-5/8 in flange	13-5/8 in flange	2,000–10,000 psi
13-5/8 in flange	16-3/4 in flange	3,000–5,000 psi
16-3/4 in flange	13-5/8 in flange	3,000–5,000 psi
16-3/4 in flange	16-3/4 in flange	2,000–5,000 psi
20-3/4 in flange	16-3/4 in flange	2,000–3,000 psi
21-1/4 in flange	20-3/4 in flange	2,000–3,000 psi

Each Casing Spool is supplied with a matched internal bore, Casing Hanger, packoff and secondary seal for the selected casing string.

Drilling Spool Configurations

Goldenman Drilling Spools are available with equal or different upper and lower connections.

Parameter	Available Configuration
Nominal bore	2-1/16–21-1/4 in
Working pressure	2,000–15,000 psi
Upper connection	Flanged or studded
Lower connection	Flanged or studded
Side outlets	Two or four outlets
Outlet sizes	2-1/16, 2-9/16, 3-1/8 and 4-1/16 in
Outlet type	Flanged, studded or threaded
Bore design	Full bore or reduced bore
Spool type	Equal bore, combination bore, adapter or spacer configuration
Pressure service	Drilling, kill, choke, circulation and test service
Sour service	H₂S-service configuration available
Face-to-face length	Project-specific stack height
End connections	API ring-type flange connections

Common Drilling Spool combinations include:

• 7-1/16 in × 3,000 psi
• 7-1/16 in × 5,000 psi
• 7-1/16 in × 10,000 psi
• 9 in × 3,000 psi
• 9 in × 5,000 psi
• 11 in × 3,000 psi
• 11 in × 5,000 psi
• 11 in × 10,000 psi
• 13-5/8 in × 3,000 psi
• 13-5/8 in × 5,000 psi
• 13-5/8 in × 10,000 psi
• 16-3/4 in × 3,000 psi
• 16-3/4 in × 5,000 psi
• 18-3/4 in × 10,000 psi
• 20-3/4 in × 3,000 psi
• 21-1/4 in × 2,000 psi

Casing Head, Casing Spool and Drilling Spool Comparison

Feature	Casing Head Housing	Casing Spool	Drilling Spool
Installation position	Bottom of surface wellhead	Above Casing Head or another spool	Wellhead or BOP stack
Main function	Connects wellhead to surface casing	Suspends and seals another casing string	Provides pressure spacing and side access
Casing Hanger bowl	Included	Included	Not included
Casing suspension	Yes	Yes	No
Primary packoff	Included with hanger system	Included with hanger system	Not applicable
Secondary casing seal	Available	Available	Not applicable
Side outlets	Annulus access	Annulus access	Kill, choke and circulation access
Bottom connection	Weld-on, threaded, slip-on or flanged	Flanged	Flanged or studded
Working pressure	2,000–10,000 psi	2,000–10,000 psi	2,000–15,000 psi
Applicable standard	API 6A	API 6A	API 6A or API 16A

Straight-Bore Wellhead Design

The straight-bore design provides a continuous internal profile for the Casing Hanger, packoff, Wear Bushing and running tools.

Its advantages include:

• Simplified hanger installation
• Common Wear Bushing interface
• Controlled hanger landing position
• Straight access for drilling and completion tools
• Reduced internal restrictions
• Easier inspection of sealing surfaces
• Compatibility with slip and mandrel hanger systems

The 45-degree internal shoulder transfers the suspended casing load from the Casing Hanger into the wellhead body.

Slip-Type Casing Hanger

The Slip-Type Casing Hanger grips the casing OD through segmented slips.

It is used where the casing is landed, tensioned and cut at the well site.

The assembly includes:

• Segmented load-bearing slips
• Casing-gripping inserts
• Hanger body
• Primary packoff
• Retaining components
• Running and setting tools

Slip Hangers are supplied according to:

• Casing OD
• Casing weight
• Casing grade
• Wall thickness
• Suspended load
• Body bowl size
• Pressure class
• Sealing system

Mandrel-Type Casing Hanger

The Mandrel-Type Casing Hanger connects directly into the casing string.

It provides:

• Positive threaded connection
• Defined casing landing position
• Controlled load-transfer shoulder
• Full-bore internal access
• Integrated pressure sealing
• High suspended-load capacity

Available connections include API casing threads and project-specific premium casing connections.

Primary Packoff System

The primary packoff seals the annulus between the Casing Hanger and the Casing Head or Casing Spool bore.

Available sealing systems include:

• Elastomeric compression packoffs
• Metal-supported elastomeric packoffs
• Lockdown packoffs
• Retrievable packoffs
• Energized secondary packoffs
• Sour-service seal packages

Seal materials are selected for:

• Pressure
• Temperature
• Drilling fluid
• Completion fluid
• H₂S
• CO₂
• Hydrocarbon exposure
• Chemical injection service

BT Secondary Seal

The BT secondary seal is installed around the casing OD at the lower section of the Casing Spool.

It provides an additional annulus barrier below the primary Casing Hanger packoff.

The seal system includes:

• Elastomeric sealing elements
• Compression or energizing mechanism
• Test and injection ports
• Casing-contact sealing area
• Retaining hardware

The casing is cut and prepared to the required stack height before the secondary seal is energized.

Lockdown Screws

Symmetrical lockdown screws retain and energize internal wellhead components.

Their functions include:

• Retaining the Wear Bushing
• Locking the Casing Hanger
• Energizing the packoff
• Preventing upward movement
• Maintaining component position during pressure cycles

Lockdown screws are supplied with pressure seals, retainers and operating heads matched to the body pressure class.

Wear Bushing

The Wear Bushing protects the Casing Head or Casing Spool bore during drilling.

It protects the following areas from drill pipe, tool joint and running-tool contact:

• Hanger landing shoulder
• Packoff bore
• Internal sealing surfaces
• Lockdown-screw contact area
• Secondary-seal bore

Wear Bushings are supplied with matching running and retrieval tools.

Side Outlet Configurations

Available annulus and pressure-control outlets include:

• Line-pipe-threaded outlets
• API flanged outlets
• API studded outlets
• VR-prepared outlets
• Gauge connections
• Test ports
• Injection ports
• Bleed-off connections

Common outlet sizes include:

• 2-1/16 in
• 2-9/16 in
• 3-1/8 in
• 4-1/16 in

Complete outlet packages include valves, blind flanges, studs, nuts, ring gaskets and pressure fittings.

VR Preparation

VR preparation provides an internal profile for a Valve Removal Plug.

The plug isolates the pressure-containing body from an external side-outlet valve during controlled maintenance.

The VR system includes:

• VR preparation in the outlet
• Matching Valve Removal Plug
• Running tool
• Pressure-control procedure
• Seal and test equipment

Bottom Connection Options

Weld-On Casing Head

The weld-on Casing Head is installed directly on the surface casing.

The body includes a weld preparation matched to the surface casing OD and wall thickness.

Threaded Casing Head

The threaded Casing Head connects to an API or project-specific surface casing thread.

Available configurations include pin and box bottom connections.

Slip-On Casing Head

The slip-on Casing Head uses segmented slips and seals around the surface casing.

This configuration provides mechanical load support and annulus sealing without welding the body directly to the casing.

Flanged Casing Head

The flanged bottom connection joins the Casing Head to a lower wellhead housing, conductor system or adapter component.

Pressure-Class Selection

Available working-pressure classes include:

• 2,000 psi
• 3,000 psi
• 5,000 psi
• 10,000 psi
• 15,000 psi for high-pressure Drilling Spools

The pressure rating applies to the complete body, end connections, side outlets, sealing system, studs and ring gaskets.

The complete wellhead or BOP stack operates within the rating of its lowest-pressure component.

API 6A Product Configuration

API 6A product requirements are defined through several procurement fields.

Product Specification Level

Available configurations include:

• PSL 1
• PSL 2
• PSL 3
• PSL 3G

The selected PSL defines material traceability, testing, NDE, manufacturing controls and documentation requirements.

Performance Requirement

Available performance levels include:

• PR1
• PR2

PR2 configurations include additional performance-validation requirements for pressure-containing and sealing functions.

Material Class

Available API 6A material classes include:

• AA
• BB
• CC
• DD
• EE
• FF
• HH

Material class selection is based on produced-fluid composition, corrosion risk, H₂S, CO₂ and chemical exposure.

Temperature Class

Temperature class is selected according to:

• Minimum ambient temperature
• Minimum well-fluid temperature
• Maximum operating temperature
• Seal-material capability
• Arctic, desert, offshore or geothermal service

Sour-Service Configuration

Sour-service Casing Heads, Casing Spools and Drilling Spools use controlled material, heat-treatment and hardness requirements.

Sour-service packages include:

• H₂S-compatible body material
• Controlled hardness
• Sour-service bolting
• H₂S-compatible seal materials
• Heat-treatment records
• Mechanical-property reports
• Hardness maps
• Material traceability
• NDE reports

Manufacturing and Quality Control

Goldenman manufacturing and inspection include:

• Raw-material certificate verification
• Heat-number traceability
• Forging and casting inspection
• Chemical composition verification
• Mechanical-property testing
• Heat-treatment control
• Impact testing
• Hardness testing
• Body dimensional inspection
• Bore and hanger-shoulder inspection
• Flange dimensional inspection
• Ring-groove inspection
• Side-outlet inspection
• Bottom-connection inspection
• Lockdown-screw inspection
• Secondary-seal-bore inspection
• Ultrasonic testing
• Magnetic-particle testing
• Liquid-penetrant testing
• Hydrostatic body testing
• Hydrostatic seat and seal testing
• Functional fit-up inspection
• Hanger and Wear Bushing fit testing
• Product marking verification
• Final documentation review

Hydrostatic and Functional Testing

The test program includes:

• Body-pressure test
• High-pressure hold test
• Low-pressure seal test
• Hanger packoff test
• Secondary-seal test
• Side-outlet test
• Lockdown-screw seal test
• Drilling Spool outlet test
• Dimensional inspection after testing
• Final visual inspection

Testing is performed with calibrated pressure instruments and recorded in the final manufacturing documentation package.

Available Documentation

The documentation package includes:

• Certificate of Conformity
• API certificate documentation
• Product datasheet
• General arrangement drawing
• Wellhead stack-up drawing
• Casing and flange configuration table
• Casing Hanger drawing
• Packoff drawing
• Drilling Spool drawing
• Side-outlet drawing
• Bottom-connection drawing
• Material certificates
• Heat-treatment records
• Mechanical-property reports
• Impact-test reports
• Hardness reports
• NDE reports
• Dimensional inspection report
• Ring-groove inspection report
• Hydrostatic test report
• Seal test report
• Product traceability list
• Installation manual
• Recommended spare-parts list
• Third-party inspection report

Applications

Goldenman Casing Heads, Casing Spools and Drilling Spools are used in:

• Onshore oil wells
• Onshore gas wells
• Offshore platform wells
• Geothermal wells
• Water-injection wells
• Gas-injection wells
• Production wells
• Exploration wells
• Workover operations
• Well-testing systems
• BOP pressure-control stacks
• Sour-gas service
• High-pressure drilling
• Wellhead replacement and upgrading

Frequently Asked Questions

What is the difference between a Casing Head and a Casing Spool?

The Casing Head is the lower wellhead body connected to the surface casing.

The Casing Spool is installed above the Casing Head and suspends a subsequent casing string.

What is the difference between a Casing Spool and a Drilling Spool?

A Casing Spool contains an internal hanger bowl and supports a casing string.

A Drilling Spool does not suspend casing. It provides pressure-containing spacing, flange adaptation and side outlets in the drilling or BOP stack.

Can slip and mandrel Casing Hangers use the same straight-bore body?

Yes. Matched slip-type and mandrel-type Casing Hangers are available for the same straight-bore wellhead configuration.

Each hanger is supplied for the selected casing size, load, bore and packoff system.

What working pressures are available?

Casing Heads and Casing Spools are available in 2,000, 3,000, 5,000 and 10,000 psi classes.

Drilling Spools are available up to 15,000 psi.

What side outlets are available?

Available outlets include 2-1/16, 2-9/16, 3-1/8 and 4-1/16 in threaded, flanged or studded connections.

What is the purpose of the BT secondary seal?

The BT secondary seal provides an additional pressure barrier around the casing OD below the primary Casing Hanger packoff.

Can the Casing Head be welded directly to the surface casing?

Yes. Weld-on Casing Heads are supplied with a bottom preparation matched to the casing OD, wall thickness, grade and approved welding procedure.

Are sour-service configurations available?

Yes. Sour-service products are supplied with controlled material, hardness, heat treatment, bolting, seals and documentation for H₂S-containing environments.

Can different upper and lower flange sizes be supplied?

Yes. Combination Casing Spools and Drilling Spools are manufactured with different upper and lower flange sizes and pressure classes.

What information is required to select the wellhead components?

Selection uses the casing program, casing sizes and weights, suspended loads, upper and lower flange sizes, working pressure, side outlets, PSL, performance requirement, material class, temperature class and service environment.

Information Required for Quotation

Please provide:

• Casing Head, Casing Spool or Drilling Spool
• Wellhead stack schematic
• Surface casing OD, weight and grade
• Suspended casing OD, weight and grade
• Maximum suspended casing load
• Upper connection size and pressure
• Lower connection size and pressure
• Body bore
• Working pressure
• Slip or mandrel Casing Hanger
• Primary packoff type
• Secondary seal type
• Lockdown-screw quantity
• Wear Bushing
• Side-outlet sizes
• Side-outlet connection types
• VR preparation
• Annulus valves
• Drilling Spool face-to-face length
• PSL
• Performance Requirement
• Material class
• Temperature class
• H₂S and CO₂ service conditions
• Minimum design temperature
• Hydrostatic test requirements
• Third-party inspection requirements
• Documentation requirements
• Required quantity
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies API 6A Casing Head Housings, Casing Spools and API 6A/API 16A Drilling Spools for complete surface wellhead and BOP pressure-control systems.

Available configurations cover casing sizes from 7 to 20 inches, flange sizes from 2-1/16 to 21-1/4 inches and working pressures from 2,000 to 15,000 psi.

Send your casing program, wellhead stack drawing, flange sizes, pressure rating, hanger type, side outlets and service conditions to:

Email: info@goldenman.com

Goldenman will provide the complete body, Casing Hanger, packoff, secondary seal, Wear Bushing, Drilling Spool, outlet components, drawings, inspection records and commercial quotation.