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Behsazan’s products include a complete line of conventional wellhead and christmas tree components for use in a wide variety of environments. Working pressures range from 2000 to 15,000 psi and are designed for single or multiple completions. A significant inventory of conventional equipment is kept in inventory to reduce lead times.
Conventional Wellheads details
Base plate is a load supporting plate attached to the starting casing head by means of either mechanical or permanent (welding) connection.
Designed to support up to 1,000,000 kg, BJ base plates fit almost all surface applications. Depending on your operation’s needs, both detachable and non-detachable options are available
Casing head is the lowest part of the wellhead that is almost always connected to the surface casing string, and provides a means of suspending and packing off the next casing string.
Providing attachment to the surface casing string through the type of bottom connection (Slip-on-weld, threaded), the casing head is typically qualified to withstand up to 10,000 psi working pressure. It suspends the casing and packs off the next casing string while providing annular outlets, as well as supporting the BOP while drilling the remaining stages.
Accepting the C-21 and C-22 –type casing hangers, the standard C-22-EG head is an API standard. It eliminates the need for lockdown screws to retain the bowl protectors, creating fewer leak paths. The bottom prep of the casing head can be machined to fit a variety of applications.
The straight bowl design prevents the wedge-locking of bowl protectors, casing hangers, and test plugs, simplifying the installation process. The C-22-EG has the option of a detachable base plate, another time-saving feature.
Safety: No need to work under a suspended BOP.
Casing hanger is a mechanism that locks into the casing head, responsible for hanging the casing pipe.
BJ Casing hangers are available to fit a multitude of well environments. Slip hangers seal automatically or manually, depending on the types of seals integral to their installation.
C-21 & C-24
These manual casing hangers are designed to use the seal as an additional pack off (which is independently installed) to provide an energized seal. These hangers fit standard conventional wellheads and can be lowered through the BOP before or after the cement has been set. With easily engaging, latching cap screws, the C-21 & 24 casing hangers are quick to install.
Designed with a "Type H" seal ring as a feature, these manual casing hangers are designed to use the seal as an additional pack off (which is independently installed) to provide an energized seal. These hangers fit standard BJ wellheads and can be lowered through the BOP before or after the cement has been set. With easily engaging, latching cap screws, the C-21 & 24 casing hangers are quick to install.
Lowered through the BOP and landed either before or after the cement has set, the C-22 incorporates a spring-loaded latch, interlocking slips, and a heavy-duty hinge into its efficient design. The slips engage the casing evenly, thus distributing the casing load equally to the bowl of the casing head. Enhanced over time to become an industry standard, this hanger is available for off-the-shelf delivery.
Casing spool is an equipment responsible for hanging the next casing string.
Designed with a bowl containing a load shoulder, each casing spool in the wellhead stack up hangs each casing sting after the casing head and before the tubing head. The bottom prep of the spool has been engineered to contain a pack off seal and flange for either a clamp-hub or a standard flange connection. For annular access, either studded or line pipe outlets can be machined into the spool.
Providing a controlled bore in the top bowl for the casing hanger seal, it also provides a seal in the bottom bowl to pack off the previous casing string and isolate the ID seals from internal casing pressure. An additional function of the casing spool is to allow for testing BOPs while drilling, retaining the bowl protector, and pressure-testing casing seals through a test port.
This straight-bowl casing spool eliminates the need for lockdown screws to retain the bowl protector, creating fewer leak paths than other standard casing spools and prevents wedge-locking of pressure-energized parts (hangers, test plugs). This model accepts C-21, C-24, and C122 casing hangers, and is formulated for use with C-22-BOP test plugs.
Threaded, studded, or flanged outlets can be machined to access the annulus, depending on your well. Bottom prep options range from metal seals to proprietary non-metallic seals, also determined by your well conditions and requirements.
Secondary seals are used to seal around the production casing stub in the bottom of the bowl of the tubing head. The various types are described below:
This design consists of two elastomer-shaped seals located in grooves in the bottom of the tubing head. A seal is achieved by interference of the seal with the outside diameter of the casing and the bottom or OD of its retaining groove. A spring molded in each inside corner of the seal provides an anti-extrusion mechanism when sealing against pressure by bridging the gap between the tubing outside diameter and casing head seal bore. The shape of the seal allows it flexibility to maintain sealing interference with the large variations in tubing outside diameter.
These seals consist of a T-cap seal element, nonextrusion rings and a receiver ring. These components will fit the HPE bottom prep configuration. The PI seal is designed for use up to 15,000 psi working pressure and temperatures up to 75°F or as low as -50°F, depending on the elastomer selected. It provides the proper compression and squeeze even with the larger API casing tolerances. The design effectively intensifies the annulus pressure and thus the internal stress in the elastomer to minimize the effects of explosive decompression.
This metal-to-metal seal consists of a "U"-shaped ring with a "bump" sealing surface at the outside and inside legs of the "U." When installed, the entry ramp compresses the legs of the "U" inward and creates contact stress in each "bump" that provides the seal. This seal requires the casing stub OD to be field machined after the casing is hung to provide the proper sealing tolerances and surface finish. This is accomplished with a portable pneumatic-driven tool. It is good for temperatures ranging from -75°F to 1200°F.
The Rough Casing Metal Seal (RCMS) is designed to use up to 20,000 psi. This seal does not require special machining of the casing stub; is compatible with temperatures from -20°F to 350°F in corrosive environments; does not require special installation tools and is simple to install; is NACE compatible; is compatible with casing spool and tubing spool strength; is compatible with casing string strength properties.
Tubing hanger is a mechanism used to hang the tubing from within the tubing head by means of a thread.
These load-bearing devices are installed in the top bowl of the tubing head and are run through the BOP. Also doubling as a means to access and manipulate additional smaller tubing lines that are utilized downhole and extended to the surface on the outside of the tubing string(s). Available for any type of single/multiple completion.
Tubing head is an equipment attached to the casing spool used to hang the tubing (smallest casing string) and seal the annulus between the tubing and casing.
The top spool on a wellhead assembly contains the highest pressure in the wellhead, and contains a load shoulder to hang the tubing hanger and tubing string. When the well is completed, the tree is installed on top of the head with a tubing head adapter. Providing a means to support and test the BOPs while completing the well, the tubing head is a necessary component when drilling and completing a well. The standard tubing head product line combines a straight-bore profile with a varied number of aligning pins, depending on the chosen model. BJ tubing heads eliminate the “wedge-locking” of the bowl protector, BOP test plugs, and tubing hangers. As additional advantages, valve removal (VR) threads are standard on all flanged or studded tubing head outlets, and if a 9” or larger top flange is required, the C-29 casing hanger can be used for casing-type completions.
Lockdown screw is a mechanism that actuates the hanger/packoff seals in the event of annulus pressure, preventing casing movement caused by thermal expansion during production
Bolt-through flange, studded flange and clamp-hub connections are available. The type and pressure rating used must match the top flange of the previous casing spool or crossover flange. Bolt-through flange connections are the most popular and economical type of connection in certain parts of the world. Clamp-hub connections are sometimes specified, because they are much faster to make up and because they reduce the diameter and weight of the assembly when space limitations are present.
BJ Surface Wellhead tubing heads have either bolt-through flange or clamp-hub top connections, which are compatible with all BJ tubing head adapters. The producing pressure of the well normally determines the pressure rating of the top connection.