• Friday, May 15, 2015

    Drilling and Completion Drilling Equipment

    Drilling and Completion

    Drilling and Completion Drilling Equipment


    ...CONTENTS...



    Functions of casing



    Drilling and Completion Drilling Equipment

    Types of Strings of Casing



     DRIVE PIPE


     CONDUCTOR PIPE

    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

    Liners

    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

    Hanger

    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
    shoe)

    Casing shoe (Directional type
    nose)

    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

    centerlizers



    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

    Scratcher

    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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