Products

Conventional Wellhead

Delta offers a full range of wellhead systems for both onshore and offshore services, and for high and low pressures. All Delta systems are manufactured to comply with the latest edition of API 6A specifications.

DC manufactures wellhead systems using various types of materials, i.e. carbon steel, stainless steel and inconel materials with temperatures ranging from -75˚F up to 300˚F (-60˚C up to 149˚C) and pressure from 2,000 to 15,000 psi. In addition, Delta offers product specification levels and performance requirements to suit all customers’ needs.

The interchangeability of this product line allows Delta to supply wellhead equipment to customers that may have used products from other vendors or manufacturers.

Types
C22, C22L, C29, C29L, C29IL

Size range
9” – 30”

Bottom connection
Slip on weld, slip on Lock, Threaded

Outlet preparation
Studded face, line pipe threaded

Casing Head Housing

The casing head housing is provided with a straight bore bowl design, which avoids damage to sealing areas by drilling tools and prevents test plug and bowl protector wedging problems when pressure is applied. It also allows the acceptance of manual and automatic slip type casing hangers as well as mandrel casing hangers. This straight bore design also reduces maintenance costs and permits suspension of heavy casing loads.

Casing Head Housing

The casing head housing is provided with a straight bore bowl design, which avoids damage to sealing areas by drilling tools and prevents test plug and bowl protector wedging problems when pressure is applied. It also allows the acceptance of various slip and seal casing hanger types such as manual, automatic or mandrel casing hangers. This straight bore design also reduces maintenance costs and permits suspension of heavy casing loads.

Bowl Types
C22, C22L, C29, C29L, C29IL
Size Range
9” – 30”
Bottom Connection
Slip on weld, slip on Lock, Threaded
Outlet preparation
Studded face, line pipe threaded

Casing Head Spool

The casing head spool has a top bowl to accommodate the casing hanger. The spool also has a bottom bowl with a pack off seal to accommodate various types of secondary seals, and a bottom flange or clamp hub for mounting it on top of a casing head or previous spool. Outlets are provided for annular access. Multiple casing spools may be stacked to hang intermediate and production casing strings.

Casing Head Spool

The casing head spool has a top bowl to accommodate the casing hanger. The spool also has a bottom bowl with a pack off seal to accommodate various types of secondary seals, and a bottom flange or clamp hub for mounting it on top of a casing head or previous spool. Outlets are provided for annular access. Multiple casing spools may be stacked to hang intermediate and production casing strings.

Casing head spools provide interchangeability of casing hanger types. If a bowl protector is required, a hold down flange with lock screws can be used.

Types
C22, C22L, C29, C29L, C29IL
Top flange size range
7”-30”
Bottom flange size range
9”-30”
Secondary seal types
P-Seals, FS-Seals, X-bushings, and rough casing metal seal (RCMS)
Outlet preparation
Line pipe, studded and extended flange

Casing Hangers

Slip-type casing hangers provide a method to transfer the weight or tension load of a casing string to a casing head or spool.
Slip-type hangers are available in automatic-sealing and manual-sealing varieties. Automatic hangers have seals that are energised by casing weight, while non-automatic hangers have seals that require means other than casing weight to be energised.

Casing Hangers

Slip-type casing hangers provide a method to transfer the weight or tension load of a casing string to a casing head or spool.
Slip-type hangers are available in automatic-sealing and manual-sealing varieties. Automatic hangers have seals that are energised by casing weight, while non-automatic hangers have seals that require means other than casing weight to be energised. Non-automatic hangers are typically used when insufficient load is available.

The slip and seal assembly simultaneously suspends and seals casing strings.
A compression-type annulus seal is automatically energised by the casing load before blowout preventers are removed. Hangers can be lowered through blowout preventers and landed either before or after cement has set.

A spring-loaded latch on the C22 hangers locks automatically and securely when the hanger is installed around the casing – no separate screws or latches are necessary.The sealing element, slip bowel and slips are pre-assembled in an easy-to-handle unit.

Only 50,000 to 60,000 pounds are normally needed to energise the annulus seal.
API ratings for specific weight and grade of pipe are available on request.

Types
C21, C22, C29, C21-P
Size Range
26”Nom.X20”Csg – 7”Nom.X2 3/8”Tbg

C22 Casing hanger

Combined in a single unit, the C22 wrap around casing hanger incorporates pack off, slip bowl and slips. When the casing load is suspended, the pack off automatically seals the casing annulus below the slips, thus providing annulus pack off before the removal of the blowout preventer.

The C22 hanger’s controlled friction reduces casing deflection, can be easily installed and is economical.

C29 Casing hanger

The C29 Casing Hanger provides high hanging capacity with minimum casing deflection. When the upper slips move down and energise the packoff, the C29’s non-tapered lower slips engage automatically and apply controlled compression. The lower slips do not move down the pipe and do not create the high compression forces, as conventional tapered slips do.

C21 Casing hanger

Slip, slip bowl and type H pack off seal rings are all combined in the C21. The type H pack off provides a positive annulus pack off after the casing has been suspended and cut off.

Tubing Head Spools

The tubing head is the top spool on a surface wellhead assembly. It is installed after the last hanger or production casing/tubing annulus seal. When the well is completed, the tree is installed on top of the tubing head with a tubing head adapter.

Tubing Head Spools

The tubing head is the top spool on a surface wellhead assembly. It is installed after the last hanger or production casing/tubing annulus seal. When the well is completed, the tree is installed on top of the tubing head with a tubing head adapter.

Tubing heads are provided with a straight bore bowl design to accommodate the outer profile of a tubing hanger. Tubing hangers come in single EFT added or dual forms for single and multiple completions, working through various pressure ratings and sizes to meet all single or multiple completion requirements.

If conversion from existing single completion to multiple completions is required, a TC spool can be installed on top of any existing Casing head spool with the same size and pressure-rating flange.

The type TCM tubing head is identical with the TC tubing head but it has no aligning pin.

Types
TC & TCM
Top flange size range
7,1/16” to 13,5/8”
Bottom flange size range
9” to 20,3/4”
Secondary seal types
P-seals, FS-seals, X-bushing, & rough casing Metal seals
Outlet preparation
Line pipe, studded and extended flange

Tubing Hangers

Tubing hangers are installed in the top bowl of a tubing head. Tubing hangers suspend the tubing and provide a primary annulus seal between the tubing and production casing.

Hangers are run through the blowout preventers and land in the top bowl of the tubing head. Tubing hangers are available for any type of tubing completion.

Tubing Hangers

Tubing hangers are installed in the top bowl of a tubing head. Tubing hangers suspend the tubing and provide a primary annulus seal between the tubing and production casing.

Hangers are run through the blowout preventers and land in the top bowl of the tubing head. Tubing hangers are available for any type of tubing completion.

Tubing hangers also act as a mean to access and manipulate additional control lines that are utilised down hole and extended to the surface through the annulus between the production casing and the tubing.

Pack offs allow tubing string manipulation for setting packers or displacing fluid while sealing the annulus between the tubing and the production casing. As well as self-energised S-seals that are installed on the extended neck to automatically seal when positioned in the assembly. S-seals will isolate production/injection fluids from other pressure chambers throughout the tubing head assemblies.

Manual tubing hanger

Manual tubing hangers are supplied with back-pressure valve threads and body seals that will activate manually by the lock-down screws.

Self-energised tubing hanger

The self-energised extended neck tubing hanger is supplied with back- pressure valve threads and annular dovetail body seals or S-seals that will self-energise and seal without the aid of a lockdown screw.

Should the customer request control line ports through the wellhead into the wellbore, this tubing hanger can be built with down hole control line preparation, to allow convenient passing through chemicals into the wellbore through the wellhead assembly.

EFT tubing hanger

EFT tubing hangers and related equipment offer a simplified but highly efficient method of running a high voltage electrical conduit into a wellhead assembly when completion demands an electric-driven submersible pump.

Threaded or split-type hangers and adapters can be used with the Delta EFT system. This design can be accommodated on up to 2500-volt systems. The entire EFT tubing hanger assembly can be run or retrieved through the stack.

Dual tubing hanger

The dual tubing hanger system comes in two different forms, single body and split body types. Both are compatible with the TC tubing head spool that requires perfect alignment using the alignment pin mechanism.

The main feature of the dual hanging system is to allow isolating and suspending two different strings that are either producing or injecting from or into two different formation zones.

Tubing Adapters

The tubing head adapter provides a transition between the tubing head and the X-mas tree. The bottom adapter connection matches the tubing head, and the top adapter connection matches the tree. These adapters come with threaded, flanged or studded- flange top connections.

Tubing Adapters

The tubing head adapter provides a transition between the tubing head and the X-mas tree. The bottom adapter connection matches the tubing head, and the top adapter connection matches the tree.

Tubing head adapters are available for all types of single and multi-string completions, including those using electric submersible pumps, packers, down hole control valves and gas lift valves.

These adapters come with threaded, flanged or studded- flange top connections.

Most tubing head adapters are available with hydraulic supply inlets for down hole control lines. If the customer requires, Delta also supplies various types of adapters that will accommodate continuous control-line capabilities and test ports for testing seals between the casing and the tubing.

These are the most commonly used tubing adapters. (Available with or without control line.)

Adapter flange

This is a simple transition piece between the tubing head and the tree, and is available with flanged or studded top connection.

ESP adapter flange

ESP adapters have seal bores to accommodate both a tubing hanger neck seal /seal sub and an electrical power feed-thru device. Standard ESP adapters are made from a single piece body.

Positive alignment can be obtained through the use of optional features in the mating ESP hanger and spool. ESP adapters can be supplied to match standard tubing heads, rated with working pressure up to 10,000 psi.

Rotating EFT adapter flange

Rotating EFT adapters are equipped with rotating flanges to mate to the tubing head, minimising concerns over alignment issues. EFT adapters can be supplied to match standard tubing heads rated to 2,000 psi and 10,000 psi working pressure.

Control line preparation and ESP preparation are optional and are available upon customers’ request.

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X-mas Tree

Composite Tree

Studded or flanged adapters, tree caps, specific number of gate valves, surface safety valve with or without wireline cutting (hydraulic and pneumatic actuator), chokes and studded tees or crosses upon customer request.

Composite Tree

Studded or flanged adapters, tree caps, specific number of gate valves, surface safety valve with or without wireline cutting (hydraulic and pneumatic actuator), chokes and studded tees or crosses upon customer request.

The tree cap can have different threads such as VAM, EUE, etc. Chokes can be positive or adjustable depending on the customer requirements. All these configurations can be provided with different sizes ranging from 2-1/16” to 9” with also different pressure ratings and PSL requirements.

Types
Cross type, tee Type and Y-type
Nominal Size Range
2.1/16” to 9”

Dual Block Tree

Delta can provide customers with several sizes of dual block X-mas trees with manually operated valves and actuator-operated valves.
The purpose of using dual bores is to produce oil from different levels inside the same well and using them (the dual bores) for multi-lateral drilling.

Dual Block Tree

Delta can provide customers with several sizes of dual block X-mas trees with manually operated valves and actuator-operated valves.The purpose of using dual bores is to produce oil from different levels inside the same well and using them (the dual bores) for multi-lateral drilling.

Delta valves can be integrated into tree blocks using API 6A standards.

The associated tubing hanger sealing systems are designed accordingly to provide an overall integrated design installation.

With the most modern CAD design facilities (Solidworks/FEA), Delta can quickly produce a design for a desired integral tree block configuration. This is manufactured to the same high standards and generally from the same materials as Delta valves and can incorporate our hydraulically operated, wireline-cutting-and-sealing valves as indicated opposite. These valves are designed to fail-safe in an emergency and to cut braided and slick-line wires. A variety of proprietary actuators can be offered for this duty.

For services where higher corrosion levels may be experienced and/or H2S embrittlement may be expected, integral tree blocks provide an economic solution by means of Inconel cladding of bores, sealing areas and valve cavities. To the left is a typical assembly drawing for a Delta dual block tree with the following specifications:

Nominal size range
2.1/16” to 3.1/8”

Single Block Tree

Delta has manufactured several sizes of solid block X-mas trees with manually operated valves and actuator-operated valves. The range manufactured covers single bores and dual bores.

Single Block Tree

Delta has manufactured several sizes of solid block X-mas trees with manually operated valves and actuator-operated valves. The range manufactured covers single bores and dual bores.

The advantages of a solid block tree are reduced overall height, reduced potential leak paths and easier installation.
Delta valves can be integrated into tree blocks using API end connections and outlet connections as covered by API 6A.

The associated tubing hanger sealing systems are designed accordingly to provide an overall integrated design installation. With the most modern CAD design facilities (Solid works/ FEA), Delta can quickly produce a design for a desired integral tree block configuration.

The single block tree is manufactured to the same high standards and generally from the same materials as Delta valves and can incorporate Delta’s hydraulically operated, wireline-cutting-and-sealing valves. These valves are designed to be fail-safe in an emergency and to cut braided and slick line wires. A variety of proprietary actuators can be offered for this duty.
For services where higher corrosion levels may be experienced and/or H25 embrittlement may be expected, integral tree blocks provide an economic solution by means of inconel cladding of bores, sealing areas and valve cavities.

Nominal Size Range
2.1/16” to 9”

Tree Caps

Tree caps are installed on the top of X-mas trees for quick access to the tubing bore via a tester or lubricator adapter for bottom hole testing, installing back-pressure valves, etc. The bottom hole test adapter allows a ﬂexible means of entry into the tubing bore.

Tree Caps

Tree caps are installed on the top of X-mas trees for quick access to the tubing bore via a tester or lubricator adapter for bottom hole testing, installing back-pressure valves, etc. The bottom hole test adapter allows a flexible means of entry into the tubing bore.

Bottom hole test adapters are used where an integral flanged unit is preferred. These adapters are furnished within the size range 2.1/16” to 7.1/16” and working pressures up to 15,000 psi. OTIS type and as per API Annex K tree caps are most commonly used.

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Unitised Wellhead

Unitised Wellhead

The split head is a multi-bowl system, connecting two casing strings in a single head which improves safety and reduces installation time.

Unitised Wellhead

The split head is a multi-bowl system, connecting two casing strings in a single head which improves safety and reduces installation time.

Features:

Saves installation time
Flexible system
Reduces BOP/diverter handling
Alternate casing programmes
Accepts standard completion equipment
Fluted mandrel casing hanger allows cement return sup through BOP stack.

The split-type unitised wellhead is a new generation of conventional wellhead. It is compact and has a vertical straight bore, which helps in saving installation time.

Its straight bore gives it the advantage of installing plurality well casings and tubing sequentially without the need to nipple-down and nipple-up BOP at each stage.

BOP is installed one time only at the beginning of the drilling process and this saves the time of repeating BOP nippling down and up processes.
In addition to that, the split-type unitised wellhead can split to act as a conventional wellhead in contingency cases, where in each well plurality strings are suspended from an individual spool or head.

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Surface Safety Valves

Delta Hydraulic Actuated Valve (DHAV)

Suitable for offshore and onshore locations and ideal for use in H2S and CO2 applications, the Delta range of hydraulic piston actuators provides a simple and reliable valve automation solution.

Delta Hydraulic Actuated Valve (DHAV)

Suitable for offshore and onshore locations and ideal for use in H2S and CO2 applications, the Delta range of hydraulic piston actuators provides a simple and reliable valve automation solution.

The DHAV is available in 2.1/16” through 7 1/16” nominal valve sizes with various pressure ratings.

DLPO

Delta’s Line Pressure Operated (DLPO) Surface Safety Systems are hydraulically operated flow line control valves, arranged to protect a facility from the effects of pipeline failures.

DLPO

Delta’s Line Pressure Operated (DLPO) Surface Safety Systems are hydraulically operated flow line control valves, arranged to protect a facility from the effects of pipeline failures.

The primary function of the Line Pressure Operated Surface Safety System is to detect any abnormal high or low flow line pressure deviations and respond to it by shutting down the streamline.

The DLPO valve is an actuated gate valve controlled by hydraulic pressure fed from the pipeline stream, thus it is well-suited for remote unattended locations. The DLPO is normally closed, preventing the flow from the upstream to downstream, and it will open only if the pressure amount of the upstream side falls within a specific pressure range.

This pressure range is defined by two pressure sensors, one for high pressure sensing (High Pressure Pilot) and one for low pressure sensing (Low Pressure Pilot).

Each pilot has its own technical function and its set pressure knob.

Available in 2.1/16” through 7 1/16” nominal valve sizes with various pressure ratings.

Self-Contained SSV

The Self-Contained Surface Safety Valve (SCSSV)uses hydraulic fluid pressure generated by a manual hand pump. Its major use is to protect facilities from the effects of pipeline failure and abnormal conditions. Unlike DLPO systems, line pressure is not used to operate the SCSSV system.

Self-Contained SSV

The Self-Contained Surface Safety Valve (SCSSV)uses hydraulic fluid pressure generated by a manual hand pump. Its major use is to protect facilities from the effects of pipeline failure and abnormal conditions. Unlike DLPO systems, line pressure is not used to operate the SCSSV system.

The Surface Safety Valve system is designed for remote shutdown of wellheads or flowlines that encounter a high or low-pressure condition. It is operated by high and low-pressure pilots sensing the flow line pressure, which enters the system through a tap in the upstream flange of the valve.

The optional ESD emergency shutdown system can be used to enable field operators to shut down the flow line at any desired time during production, testing or maintenance operations.

Available in 2.1/16” through 7 1/16” nominal valve sizes with various pressure ratings.

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Valve

Frac Valve

Frac Valve

Gate Valve

Delta's gate valve has been proven in critical oil field services throughout the world. Its low cost, rugged dependability and ease of operation make it the valve of choice for reliability in the field.

Gate Valve

Delta’s gate valve has been proven in critical oil field services throughout the world. Its low cost, rugged dependability and ease of operation make it the valve of choice for reliability in the field.

Delta offers gate valves in various models & sizes from 1 -13/16” to 9” and 2,000 psi through 15,000 psi pressure ratings, and in various trims and body materials to meet clients’ specifications.

All the models were built and tested to comply with appendix F – performance verification procedure level PR2 and made to the highest quality standards.

All the models have a thick solid gate attached to the valve stem with a T-shaped nut that allows the gate to float, reducing deflection and bending. The float mechanism eliminates the pressure lock.

Major operational features of the Delta gate valves are:

– Full bore through conduit API 6A flanged slab gate valve
– Metal-to-metal sealing on backseat, body-seat, seat, gate and body-bonnet interfaces ensuring sealing under all operating conditions
– Seat and gate faces are coated with tungsten carbide, which is highly corrosion resistant
– Bidirectional Sealing
– Non-rising stem design
– Non-rising & back seating stem design
– Forged body and bonnet for all material classes
– Simple maintenance and service without the use of special tools
– Self-energised stem packing

TC gate valve

Delta TC gate valves are API 6A slab gate for 2000 to 5,000 psi service. Delta TC gate valves are available for API 6A sizes 1 13/16” through 9” and for temperature ratings K through V in PSL 2, 3, 3G, 4

Delta STC gate valve

Delta STC gate valves are API 6A slab gate for 2000 to 15,000 psi service. Delta STC gate valves are available for API 6A sizes 1 13/16” through 9” and for temperature ratings K through V in PSL 2, 3, 3G and 4. Various body and trim materials are available to suit customer requirements.
Additional features of the Delta STC gate valves are:

• Excellent low pressure, low temperature sealing by the use of self-energised PTFE seals
• Low opening torque by the use of thrust bearings

Choke Valve

Choke types: Adjustable chokes & positive chokes
Body design: Angle type
End connections : Flanged or threaded ends

Choke Valve

Choke types: Adjustable chokes & positive chokes
Body design: Angle type
End connections: Flanged or threaded ends

Adjustable Choke

The basic adjustable choke has threaded connections for use on pressure rating systems. It can be converted to a positive choke by changing bonnet and trim.

Positive Choke

All Delta positive chokes come with a one-piece bean, which can be easily changed without removing the choke from the production line. After shutting the well, pressure is bled from the choke body.

Then the bonnet is removed and a bean wrench is used to remove and replace the bean. The various sizes of positive beans allow the production flow to be set as needed. It can also be converted into an adjustable choke.

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