• Friday, May 15, 2015

    Drilling and Completion Drilling Equipment

    Drilling and Completion

    Drilling and Completion Drilling Equipment


    Functions of casing

    Drilling and Completion Drilling Equipment

    Types of Strings of Casing



    Ashort string of casing  of a large dimeter which is normmally the first casing string to be run in the hole

     Surface Casing

    Astring of casing set in a wellbore to case off any fresh water sands at shallow depths and it set below the conductor pipe 

     Intermediate Casing

    Astring of casing set in the borehole to prevent the hole from caving and seal off formation

     Production Casing

    Acasing string which used as aproduction tubing to run  complet the well for production


    Astring of casing which placed at which awell is to be drilled and used to save the money of drilling

    Example Hole and String Sizes

    Casing in exploration well

    Casing in development well

    Running the casing

    Casing Collar

    Test BOP Sytem

    Installing the Casing


    Making perforation

    Running production tubing

     Casing Accessories

    Guide show

    is used to guide the csg through doglegs and restriction in the hole and to protect lower edge of the csg

    Float shoe

    Guide show contains avalve element(ballor flapper )prevents cement from flowing back into csg

    Casing shoes (reaming type

    Casing shoe (Directional type

    Float collars

    one way valve placed at one or two joints above the shoe prevents mud from entering

    the csg while it is being lowered inside and cement from flowing back into csg


    adevice run around the casing which is designed to support and centralise the casing in deviated wellbores

    هى عباره عن اداه تستخدم لجعل ماسوره الحفر فى مركز الحفره حيث تساعد drill string على عدم الانحراف يمين او يسار اثناء عمليه الحفر


    adevice fastened to the outside of the casing which removes mud cake and the promote agood cement job

    هى عباره عن اداه تستخدم لتنظيف البئر من خارج ال casing عن طريق ازاله mud cake اثناء عمليه ال cementing وذالك لعمل روابط جيده بين ال cement وwellbore well

    selection of casing setting depths

    Fracture gradient Definitionand importance

    The forces affecting on the casing

    external force

    Which rusult from an external pressure which tend to collapse the casing

    internal force

    Which rusult from an internal pressure which tend to burst the casing

    Longitudinal or axial loading

    Axial loading my be tention due to dead load or compresion due to buoyancy

    Classification of CSG

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