Thesis (MSc) - Cyprus International University. Institute of Graduate Studies and Research Petroleum and Natural Gas Engineering Department

Includes bibliography (sheets 74-78)

ABSTRACT
Drilling is a complex process that involves a multitude of variables that must be
considered in order to achieve the best possible results. In particular, geological and
geophysical data are critical to determining the drilling operation parameters, as they
provide important insights into the subsurface conditions that the drill bit will
encounter. Geological data provides information about the composition, structure,
and stratigraphy of the subsurface rock formations. This data is typically obtained
through geological surveys, well logs, and other forms of subsurface imaging. By
analyzing this data, geologists can identify the types of rock formations that are
present, as well as their depth, thickness, and other key characteristics. This
information is then used to determine the appropriate drilling technique, such as
rotary drilling, directional drilling, or hydraulic fracturing, as well as the drilling
speed and depth. Geophysical data, the opposite hand, provides information about
the physical properties of the subsurface rock formations, such as their density,
porosity, and conductivity. This data is typically obtained through seismic surveys,
magnetic surveys, and other forms of subsurface imaging. By analyzing this data,
geophysicists can identify the location and extent of subsurface structures, such as
faults, fractures, and other features that may affect the drilling operation. This
information is then used to upgrade the drilling parameters, such as the drilling fluid
type and viscosity, the size and type of the drill bit, as well as the bit weight.
Together, geological and geophysical data play a critical role in determining the
drilling operation parameters. By carefully analyzing these data sets, drilling
engineers can develop a detailed understanding of the subsurface conditions and
tailor the drilling parameters to maximize drilling efficiency and minimize
operational risks. For example, if the geological data indicates the presence of hard,
abrasive rock formations, a harder, more durable drill bit may be used, while if the
geophysical data indicates the presence of soft, porous rock formations, a lighter
weight on bit may be used to avoid drilling too deeply and causing damage. In
addition to these data sets, drilling engineers must also consider a range of other
variables when determining the drilling operation parameters, such as the drilling rig
capabilities, environmental conditions, and safety considerations. By carefully
balancing all of these variables, drilling engineers can achieve optimal drilling results
and ensure a safe and efficient drilling operation.
Keywords: Drilling, Geological, Geophysical Operation, Parameters