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Drilling and Completion Drilling Equipment

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

    A short string of casing  of a large dimeter which is normally the first casing string to be run in the hole

     Surface Casing

    A string of casing set in a wellbore to case off any freshwater sands at shallow depths and it set below the conductor pipe 

     Intermediate Casing

    A string of casing set in the borehole to prevent the hole from caving and seal off a formation

     Production Casing

    A casing string which used as a production tubing to run  complete the well for production

    Liners

    A string 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 an exploration well


    Casing in development well



    Running the casing


    Casing Collar

    Test BOP System

    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 valve 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

    centralizers



    advice run around the casing which is designed to support and centralize 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

    advice fastened to the outside of the casing which removes mud cake and the promote a good 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 result from an external pressure which tends to collapse the casing

    internal force

    Which result from an internal pressure which tends to burst the casing

    Longitudinal or axial loading

    Axial loading my be tension due to dead load or compression due to buoyancy

    Classification of CSG

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