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 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
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
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
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
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
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