الفهرس 
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Abstract
Due to the location of Belayim land oilfield, where it lies on the eastern bank of the Gulf of Suez, a majority of wells are being drilled deviated from shore line, as well as vertical and horizontal wells to maximize the production and hydrocarbon recovery in the mature reservoirs of the study area. It is of great challenge to drill a high angle well successfully through a such complex structure and tectonic setting, especially the area is affected by hydrocarbon depletion with time and fluid migration while production. The stratigraphic setting of the area possesses significant drilling challenges that vary widely from salt creep and reactive shale to stress-related problems.
The objective of this thesis is to investigate, focus and integrate drilling, geologic and petrophysical knowledge for a better understanding the geomechanics of the study area, in order to select the optimal mud weight and to study the impact of stress orientation and magnitude, on the wellbore stability for safe drilling.Practically, the drilling events such as the stuck pipe, kick and tight hole associated with the mud weight profiles can be used for better understanding the geomechanical setting of the concerned area.A novel performance model is established on finding the relationships between the drilling parameters and the rate of penetration based on trigonometry, have been discussed in this study to find the most influential conditions on the rate of penetration. A new equation and a workflow to estimate the rate of
iiipenetration in the hard rocks have been constructed, based on the sonic measurements.In absence of the core chips to test the rocks for the mechanical properties, a set of relationships between the static elastic constants and the dynamic elastic constants are derived from the measurements of elastic wave velocities in the rocks and sonic logging .These data, in conjunction with the bulk density measurement permit, the in-situ measurements and calculations of the mechanical properties of the rock.For enhancement the drilling performance of Belayim land oilfield through mitigating the risks, while drilling and production, a 3D mechanical earth model have been constructed through maximizing the values of the data integration by 3D grid and upscaled the petrophysical properties and lithology. Also, understanding the main causes of rock failure through 3D MEM resulted in improved drilling efficiency and reduced drilling costs.