Page 205 - Practical Well Planning and Drilling Manual

Section 2 revised 11/00/bc 1/17/01 12:04 PM Page 181

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2.4

Drill Bit Selection,
Parameters and Hydraulics

Field data in this section was allowed into the public domain with the
kind permission of the Badr Petroleum Company, Egypt (BAPETCO).

2.4.1. Overview of the Structured Approach
One of the two major elements in efficient drilling is maximizing
drilling rate. This is intimately related to selecting the correct drill bits
and using correct drilling parameters to maximize drill rate and bit life.
For well planning, it is necessary to construct a good overview of
field drilling history. Where several wells have been drilled, the amount
of data that can be usefully analyzed is large. Often such offset data is
not analyzed properly, which leads to less effective planning and high-
er drilling costs.
A structured approach is shown here to make the best bit selection
based on all available data. Actual selection on the rig may be different
but if it is, it should be justified by noting all the factors which went
into that decision and why the selected bit would improve performance
over the programmed bit.

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