• Thursday, February 18, 2016

    what is the differance between Differential sticking and Mechanical stucking

    what is the differance between Differential sticking and Mechanical ?stucking


    Differential sticking one of the most common problem occure during drilling as aresult of differential pressure between hydrostatic pressure of mud and formation pressure of mud ie when the hydrostatic pressure is greater than the formation pressure which cause pushing adrill string into afilter cake of permeable formation

    هذه عمليه مشهوره جدا تحدث اثناء الحفر وذالك نتيجه زياده ضغط سائل الحفر عن ضغط التكوين الصخرى والذى يودى بدوره الى دفع عمود الحفر الى جانب البئر مما يودى الى التصاقها بااحد الجوانب الذى يقل فيه الضغط




    when the Differential sticking occure  moving the pipe string   
    in the upward and downward direction is impossible
    but
    free circulation is easily established

    فى حاله حدوث Differential sticking يكون من الصعب تحريك انبوبه الحفر للاعلى او للاسفل نتيجه التصاقها بجدار البئر ولكن يكون من السهل عمل عمليه circulation للبئر

    what is the differance between Differential sticking and Mechanical stucking?


    ?What should i do for this situation 

      Reducing of hydrostatic pressure by circulation and reducing mud weight

    Reducing the contact area by reducing the thickness of filter cake by using the solids in mud to the minimum and use mud of low water loss

    Most pipe sticking problems are associated with drill collars and the ideal solution is to use drill collars with minimum surface area by using aspirally grooved drill collar and heavy weight drill pipe

    The contact area can also be reduced by using stabiliser which centralise the drill collars within the hole

    Displacing the choke

    Maintain drill string rotation at all times if possible

    Dont use high mud weight

    to free mechanical stucking we should be

    rotating and reciprocating the drill string and increase flow rate 

    or

    increasing the mud weight if mechanical stucking caused as arusult of plastic shale

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    Mechanical stuck pipe

    When drill cutting or sloughing formation pack off the annular 
    space around the drill string as aresult of improper cleaning

    what is the differance between Differential sticking and Mechanical stucking?



    يحدث هذا النوع عندما تقوم ال  cutting بسد الفتحات حول drill string وذالك لعدم حدوث عمليه تنظيف البئر من شوائب الحفر بصوره جيده وبطريقه مستمره

    The settling of alarge amount of suspended cutting to the bottom when the pump is shut down

    عندما يتم قفل معدات الضخ المسئوله عن ضخ سائل الحفر تقوم شوائب الحفر بالترسيب فى قاع البئر 


    When drill string is run too fast it hits abridge or tight spot

    عندما يتم تشغيل عمود الحفر بسرعه كبيره جدا وذالك للتغلب على الصخور الصعبه او الجسور


    Tight spots can result from drilling undersized holes due to the use 



    of worn drill bits

    Drilling at excessive Rates Of Penetration (ROP) for a given circulation rate. This generates cuttings faster than they can be circulated mechanically from the annulus

    عندما يتم الحفر بمعدل اختراق عالى يتسبب ذالك فى تكوين cuttings بشكل سريع جدا مما يعمل على عدم قدره سائل الحفر برفع كل هذه الشوائب مما يودى الى حدوث عمليه
    Mechanical stuck pipe

    what is the differance between Differential sticking and Mechanical stucking?


    The usual method used to free mechanical stuck pipe is to work the drill string either by rotation and pulling it or by activating adrilling jar

    note
    Differential sticking there is acirculation but there is no a rotation 
     Mechanical sticking  there is no acirculation and arotation

    Mechanical stucking>Differential sticking> hole problems<Drilling>< egy petroleum engineer,><Oil and Gas, petroleum, petroleum engineer, Production