Wellhead and Christmas Tree
CQS Tree Casing head Casing Spool Tubing Spool Casing Hanger
Tubing Hanger Compact Tree Bolck Tree Multi Bowl Dual Tubing
CQS Tree


CQS Conventional Wellhead System

MSP/Drilex CQS conventional wellhead systems feature flexibility, compatibility and interchangability that bring down the inventory level and cost for it's users.


CQS wellhead system includes CQS casing head, CQS casing spool, TD tubing spool and conventional Christmas tree. CQS wellhead system has a special designed all conduit metal-to- metal seal system for the high pressure part of a wellhead system, which provides reliable, durable, corrosion resistant seals.

Key Features:

  • Working pressure: up to 20,000 psi;
  • Range of temperature: API standards;
  • Trims: AA, BB,CC,DD,EE,FF,HH;
  • Hang-off capacity: up to 80% of pipe body yield;
  • Casing head: API 6A standard;
  • Casing spool: API 6A standard;
  • Casing hanger: MSP/DRILEX CQ-G3, CQ-G5, CQ-G6, CQ-GS, CQ-GM;
  • Tubing spool: MSP/DRILEX TD tubing spool;
  • Tubing hanger: MSP/DRILEX TD-E, TD-EM, TD-MS tubing hanger
  • CQS-W

    CQS Casing Head

    CQS casing head is a high load capacity wellhead that designed to fit various well depth and completion type. it feasures a bowl of two 45 degree shoulder, which holds the pack-off hydraulic pressure and test load by the upper shoulder while the lower one provides independent support for the casing load. The dual seal and pack-off bushing offers more choices to the customers.


    CQS casing head has three type of bottom connection options: CQS-W, CQS-SL, CQS-BT.




    CQS-W Casing Head

    Standard O-ring is available with CQS-W Bottom Connections suitable for 10-3/4" or smaller casing preparations requiring no welding. For larger than 10-3/4", an external welding will be required. In addition, this connection contains a 1/2" line test port to vaildate the integrity of the welding and O-ring seals.



    CQS-BT Casing Head

    CQS-BT Casing Box Thread is offered for the applications inwhich threaded connections are specified for casing heads.(Casing Housing Box X Casing Pin Thread). In this case, the casing outer diameter shall be standardized where possible to accept CQS heads



    CQS-SL Casing Head

    CQS-SL Bottom Connection is a simple slip assembly requiring less installation time and thanks to no welding and utilizing ES seal. CQS-SL can work at 10,000psi and be repeated for more than one well.

    Casing Spool

    CQS Casing Spool

    CQS casing spool is used for sealing the casings(except the surface casing) and carrying the following-up casing series.With annular casing head, designed with double 45 degree shoulder, the casing head can carry the load of casing series with security and reliability. The upper shoulder carries the sealing pressure and test load, and the lower shoulder seperately carries the weight of the casing series. The casing spool can be collocated with various sealings: single,double ES, MTM, and EM.



    Single or Double ES Seal

    ES seals are for 10,000 psi and below working pressure under moderately corrosive and inclement environment, consisting of one or two large elastomer seals with seperate anti-extrusion back-up ring. Both single and double ES seals are sized to accomodate the tolearnce of casing and can be used on machined hanger necks.


    ES Casing Seal

    ES casing seals fit virations in different type of casing program.It utilized an ES seal and an extrusion preventing back-up ring for working under pressure up to 10,000 psi. Options of one whole piece or split back-up ring are available for field operation.


    MTM Seal

    MTM seal is a metal-to-metal crossover seal purposed for inclement services and high-corrosionn environments, with working pressure up to 20,000 psi. Gas-tight requirement is satisfied by its reliability and durability


    EM Seal

    EM seals consist of both elastomer and metal-to-metal seals, which benifit a short and temporary seal application when installed without the metal-to-metal seal rings in place. While the final long term seal application required, the metal-to -metal seal rings can be put back, providing flexiblity for field operation and helping to lower operation cost.

    Tubing Spool

    TD-C Tubing Spool

    MSP/DRILEX offers TD-C Tubing Spool as standard spool for single completion with flange end dimensions satisfying API 6A standards.


    Feature of Bowl: a single 45°shoulder is employed in a straight bore for supporting the tubing load and avoiding bowl damage caused by drill stem rotation. Hoop load is minimized on the spool while high hanging capacity maintained.


    For single completions, TD-C tubing spool is compatible with TD-EM, TD-MS, TD-E tubing hangers.


    Line pipe threaded and studded outlets are available and the studded outlets can be threaded for valve removal at field.


    Lock-down screws feature a packing element installed in front of threads, which will guard threads from contamination caused by erosive well fluids and eliminate solids accumulation behind screw.


    Single and double ES, EM and MTM secondary seals are available.


    Metal-to-Metal seals are used for all test ports and ventings. Check valves are buried in injection ports.


    Casing Hanger

    CQ Casing Hanger

    MSP/DRILEX CQ serial hangers include CQ-G3, CQ-G5, CQ-G6, CQ-GS, CQ-GM, which are compatiable with MSP/DRILEX CQS wellhead.




    CQ-G3 casing hanger

    CQ-G3 casing hanger is a wrap-around slip assembly with hang-off capacity rated at 80% of pipe body yield,and the cap screws available for enhancing seal efficiency.A rated hang-off capacity is enough to create perfect seal.


    CQ-G5 casing hanger

    CQ-G5 casing hanger is a wrap-around slip assembly for pressures 15,000 psi,with hang-off capacity rated at 80% of pipe body yield and a load of 15,000 lb required for CQ-G5 to create seal.The seal can be enhanced by using screws. A rated hang-off capacity is enough to create perfect seal.


    CQ-G6 casing hanger

    CQ-G6 casing hanger is a wrap-around slip assembly for pressures 5,000 psi,with hang-off capacity rated at 70% of pipe body yield and a load of 15,000 lb required for CQ-G5 to create seal.The seal can be enhanced by using screws. A rated hang-off capacity is enough to create perfect seal.



    CQ-GS casing hanger

    CQ-GS Casing hanger is a gravity Self-Seal casing Hanger, which is relay on its gravity to set seal.


    CQ-GM casing hanger

    CQ-GM Mandrel Casing Hanger is used in Solid Block Tree,it greatly reduces the height of the Christmas Tree, offers convenience to fieldwork.

    CQ-GM Hanger

    TD Tubing Hanger



    TD-E Tubing Hanger

    TD-E Tubing Hanger,utilizing elastomer seals,withstands impact of high pressure 10,000 psi and moderately corrosive services. It can ensure the seal within the life cycle of elastomer. It can incorporate a control line exit block, needle valve type or a bull plug for standby.



    TD-MS Tubing Hanger

    TD-MS Tubing Hanger, featuring two total metal-to metal seals respectively for hanger neck and bottom, can resist high corrosive well fluids and pressure up to 20,000 psi regardless of thermal or pressure cycling. An exit block for control lines of safety valve and chemical injections is available on request, or a plug for standby.



    TD-EM Tubing Hanger

    TD-EM Tubing Hanger, featuring elastomer and metal-to-metal seals both for neck and lower part, can resist corrosive well fluids and high pressure up to 20,000 psi to extend service life.


    TD-EM tubing hanger offers reliability and convenience to site operations.


    TD-EM tubing hanger can incorporate a control line exit block either in bull plug or block needle valve type for the control lines to downhole.


    TD-MS and TD-EM hangers are recommended for purpose of long-term and fixed production location, while tubing hangers only with elastomer seals usually used for short-term or trial production.


    TD-EM tubing hanger, for ease of short-term operation, can be used only with elastomer seals. However it will benefit field operation for both short-term operations and long productions.


    Solid Block Tree

    Solid Block Tree

    Considering site space, MSP/DRILEX provides Solid Block Christmas Trees with working pressure up to 20,000psi. Compared to conventional Christmas tree, Solid Block Tree has a single solid-forged body with lower and upper master valve, wing valve and swab valve. Its advantage lies in a compact body requiring smaller space, improving fire-resistant performance and educing potential leak channels.


    MSP-DRILEX MD gate valve can be incorporated into Solid Block Christmas Tree with working pressure up to 20,000psi. Similar to conventional Christmas Tree, Solid Block Christmas Tree can also accommodate single or dual tubing strings.



    Block Tree Picture Block Tree Picture
    Compact Tree

    Integrated Compact Wellhead and Horizontal Tree

    It is widely used in the world and develop with fast pace, which repace the old wellhead as well as old oil-extraction wellhead. It is easy to be accepted because it can not only meet the old wellhead performance and function but also equipped with some important advantages and feature.

    Advantages and Features:

    Lower Height


    Eese of Operation and Maintenance-Thanks to lower height, no scaffolding operations are required. This will ease site production, management, operation and maintenance activities.


    Ease of Site Installation – Site installations are conducted on ground to improve work efficiency.


    Ease of Leakage Detection-Usually leakage arises from the valves and connections along production lines. For old wellheads of large overall sizes, leakages arising from upper production lines are difficult to detect. But for compact wellheads, any leakages are at sight of operators and easy to detect.


    Efficiency Improved


    Less Shut-down, High Efficiency-Conveniences for site preparations, production, daily management, operations work-over and maintenances will improve efficiency, minimize shut-down, cut down loss and improve incomings.


    Ease of Work-over


    With production lines below top flange, work-over operations can be conducted without removal of production lines

    Compact Tree Compact Tree