Directional Drilling

Directional Drilling

Upon completion of this chapter, you should be able to:

• Describe the general aspects involved in well planning.
• Describe the main features of the common well patterns and list
the applications and disadvantages of each.
• State the two basic types of downhole motor and give a simple
explanation of the operating principles of each.
• Explain what is meant by “reactive torque” and the importance
of this in directional drilling.
• List the main deflection tools available and state the advantages
and disadvantages of each.
• Explain what is meant by the “toolface” of a deflection tool.
• Define and explain the terms “Tool Face Orientation”, “High
Side Tool Face”, and “Magnetic Tool Face”.
• List the main factors which affect the directional behavior of
rotary assemblies.
• Explain the Fulcrum, Stabilization and Pendulum principles.
• Explain what is meant by the terms “steerable motor” and
“Navigation Drilling System”.
• Explain the concept of “three-point geometry” and calculate the
“Theoretical Geometric Dogleg Severity” (TGDS) of a
Navigation System.
• Explain the differences between “Conventional” and
“Navigational” drilling systems