Date of Award
Master of Science (MS)
Minimizing the costs and risks of drilling and achieving a maximum production rate are
technically and economically challenging, this becomes more crucial when drilling in tight
shale formations, an in-depth investigation of geomechanical behavior of the reservoir,
including elastic properties, and the in-situ stresses also known as Mechanical Earth Model
(MEM) is inevitable, which is studied by concept of Mechanical Earth Model (MEM). In this
thesis, the concept of the MEM is used to determine rock strength and elastic properties of the
wells in the Blue Buttes Field, Williston Basin, North Dakota. Blue Buttes is one of the major
oil producing fields from the Bakken Formation.
For this study, a 3-D MEM is constructed for the field. The input data includes wireline logs,
core, drilling reports and, geological properties of the field. For the study, analysis was done on
state of In-situ stresses, formation properties, and type of instabilities that occur around the
trajectory of the wellbore specifically in the Bakken Shale Formation by acquiring anisotropic
poro-elastic relationships to incorporate pore pressure and stresses in the field more accurately.
In the next step, safe mud weight window was determined the to avoid shear and tensile failure
during drilling, and mitigating other wellbore instabilities issues by controlling the sub surface
parameters and considering chemical properties of the shales and mud activities. The
constructed MEM model revealed how changes in pore pressure, stresses, and the overall
properties physiochemical of the shale can hugely impact the drilling process and production
from the field. which will minimize the unplanned well maintenance cost. Further it is helpful
in studies such as drilling in the deviated holes, hydraulic fracturing, sanding analysis and
perforation stability analysis.
Mohammed, Rehan Ali, "A 3D Geomechanical Model Of Blue Buttes Field In Williston Basin, North Dakota" (2018). Theses and Dissertations. 2287.