Conventional Wellheads

SERVICES

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

Grayling 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, Grayling offers product specification levels and performance requirements to suit all customers’ needs.

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

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 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.

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.

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.

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Tubing Head Spool

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 Hanger

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.

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.

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.

Surface Safety Valves

Hydraulic Actuated Valve (HAV)

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.

Valves

Gate Valves

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.