American Oil and Gas Reporter - April 2018 - 127

SPECIAL REPORT: DRILLING TECHNOLOGY
rpm) to establish drilling parameters that
increase the drilling optimization index.
The amount and direction that each of
these drilling parameters can be moved
is limited to the area of the cone to ensure
that other dysfunctions are not created
by move.
Similarly, when low efficiency results
from a dysfunction identified by the system, a cone is generated that suggests
corrective action corresponding to that

dysfunction. When drilling inefficiency
is caused by stick-slip, the shaded area
of the cone will cover an area on the plot
down and to the right of the apex, indicating a need to decrease WOB and increase rpm. The shaded area allows the
driller to easily understand what values
for each parameter potentially will eliminate the stick-slip condition.
The cones also can serve as a guide to
the driller in the presence of other dys-

FIGURE 1
Visual Display of Suggested Actions (Cones)
The red dot represents the current operational point and green represents the suggested operational region

When Drilling Efficiency Index is low due
to Stick Slip, move down and to the right.

WOB

When Drilling Efficiency Index is low due
to Low ROP, move up and to the right.

WOB

It identifies drilling dysfunctions by
tracking the movement characteristics of
various sensor data in relation to modelpredicted values and aggregates this information to produce a holistic drilling
optimization index.
This novel "cone drilling" system combines Bayesian network-based dysfunctions
identification with mechanical specific energy (MSE) tracking to create a single
normalized quantity upon which drillers
can make decisions to adjust drilling parameters.
The cone drilling system automatically
determines whether the drilling optimization
index is below a specified threshold and
provides recommended parameter changes
to improve drilling performance. Suggestions may include changes to weight-onbit (WOB) or rotary speed (rpm), or both.
The system delivers these recommendations
to the driller as a text or visually.
Drilling Cone

RPM

RPM

When Drilling Efficiency Index is low due
to Whirl, move up and to the left.

WOB

WOB

When Drilling Efficiency Index is low due
to Bit Bounce, move right. If that does not
improve the situation, the region shifts
counter clockwise to suggest a move
to the left and up.

RPM

When Drilling Efficiency Index is low due
to Bit Balling, move right and down.

When Drilling Efficiency Index is good,
stay in the green region.

WOB

RPM

WOB

Visual representations of suggested
actions are in the form of a cone-shaped
figure projected on a WOB-rpm plot (Figure 1). The cone, with its dimensions
and orientation calculated from dysfunction beliefs, indicates the action the driller
should take-increase or decrease WOB
or rpm-to mitigate the dysfunction. The
system also may recommend that the
driller engage or disengage automatic
control systems.
Recommendations are plotted using
current operating conditions as the apex
of the cone. The shaded area within the
cone is defined by operating parameters
that will improve the drilling performance,
or drilling optimization index. From this
simple chart, drillers can quickly and
easily determine necessary steps to enhance drilling efficiency. The cone also
indicates to the driller the limits that each
parameter of WOB and rpm may be
moved in relation to the other.
For example, when low ROP results
in a low drilling optimization index, the
cone shape and position on the chart tells
the driller to move up and to the right on
the curve (increasing both WOB and

RPM

RPM

APRIL 2018 127



American Oil and Gas Reporter - April 2018

Table of Contents for the Digital Edition of American Oil and Gas Reporter - April 2018

Contents
American Oil and Gas Reporter - April 2018 - 1
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American Oil and Gas Reporter - April 2018 - Contents
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