الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Wellbore instability problems significantly increase the cost of drilling and operations in the oil and gas industry which affecting directly in delaying the production. These problems can occur in a variety of forms including stuck pipe, loss circulation, hole enlargement, unintentionally induced tensile fractures or difficult directional control incidents. Wellbore instability problems give rise to increasing the non-productive time (NPT) and the non-productive cost while drilling tectonically stressed and unstable formations.
To focus the possible causes of wellbore instabilities in this field, a problem diagnostic workflow was done by analyzing well log data, drilling reports, mud logging reports, and pore pressure measurements. An investigation for the wellbore instability issues in a mature oil and gas field called Meleiha Field, South of Matruh city, Western Desert, Egypt.
In this thesis, a wellbore stability model has been developed for predicting the behavior of borehole instability zones to provide the safest mud window with time. Geo-Mechanical Earth Model (MEM) was combined with failure criterion “Modified Lade criterion”. The developed model was generated in order to predict the optimum mud window by implementing an integrated wellbore stability study to help avoiding wellbore instability problems in Meleiha field.