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Directional drilling has become a very important tool in
the development of oil and gas deposits. Current
expenditures for hydrocarbon production have dictated
the necessity of controlleddirectional drilling to a much
larger extent than previously.
Probably the most important aspect of controlled
directional drilling is that it enables producers all over
the world to developsubsurface deposits that could
never be reached economically in any other manner.
In this module a number of topics will be covered that
must be understood by the directional driller. The
various typesof wells and applications of directional
wells will be touched upon along with well profiles and
well planning.
Introduction to Directional Drilling Revised: 10/20/98 6:37 AM Page 4 of 52
Source:SLC IntroTo DD.doc Revised: 10/20/98 6:37 AM
2 Directional Drilling
In this lesson you will learn to do the following:
Define directional drilling by choosing the correct answer from a list ofselections. Recall the
historical development of directional drilling by choosing the correct answer from a list of
selections.
2.1 Definition of Directional Drilling
Controlled directionaldrilling is the science and art of deviating a wellbore along a planned
course from a starting location to a target location, both defined with a given coordinate system.
2.2 Description of DirectionalDrilling
Drilling a directional well basically involves
drilling a hole from one point in space (the
surface location) to another point in space
(the target) in such a way that the hole canthen be used for its intended purpose.
A typical directional well starts off with a
vertical hole, then kicks off so that the
bottom hole location may end up hundreds or
thousands of feet ormeters away from its
starting point.
With the use of directional drilling, several wells can be drilled into a reservoir from a single
platform.
2.3 Historical Development of
Directional Drilling