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An advanced level of PET 331 Drilling
Engineering I. The course provides the students with the
basic principles, concepts and models used in drilling
engineering to solve problems encountered in a well being
drilled. The important concepts are developed from fundamental
scientific principles and illustrated with examples. The
relation between the fluid properties and the subsurface
hydraulic forces present in the well is acquainted for
the turbulent flow in pipe and annuli, the surge pressures
due to vertical pipe movement, and the jet bit nozzle
size selection. Casing design criteria and special design
considerations are introduced. Reasons for directional
drilling, planning and calculating the directional well
trajectory, direction measurements, principles of BHA,
and deviation control are provided. Coiled tubing drilling
applications and principles of underbalanced drilling
are examined.
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The main objectives of the course to introduce
the student
(1) the subsurface hydraulic forces present in the well,
(2) drilling hydraulics,
(3) casing design, special considerations, and procedures
used in the design of casing strings,
(4) reasons for directional drilling and deviation control,
(5) emerging technologies and applications such as coiled
tubing and underbalanced drilling,
(6) ecological and environmental considerations of drilling.
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Drilling hydraulics; static well conditions,
hydrostatic pressure in complex fluid columns, effect
of entrained solids and gases in drilling fluids, kick
identification, nonstatic conditions, laminar and turbulent
flow in pipe and annuli, rheological models, initiating
circulation of the well, jet bit nozzle selection, surge
pressures due to vertical pipe movement, particle slip
velocity. Casing design; API casing performance properties,
burst, collapse, tension, effect of combined stress, casing
design criteria, selection of casing setting depths and
casing sizing, surface casing, intermediate casing, and
production casing. Directional drilling and deviation
control; methods to calculate the directional well trajectory,
planning the kickoff and trajectory change. Directional
drilling measurements; magnetic tools, steering tools,
gyroscopic measurement, surveying accuracy. Deflection
tools; openhole and casing whipstocks, jetting bits, mud
motors, turbines, planning a trajectory change with a
PDM. Principles of the BHA; statistics of the tubular
column, slick BHA, Stabilizer BHA, BHA's for holding inclination
angle, rotation of the drillstring. Deviation control;
deviation control for drilling large-diameter wellbores,
geological forces and deviation control, general deviation
controls.
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