American Oil and Gas Reporter - April 2018 - 129

A set of discrete probabilistic weights,
or conditional probability tables, connect
the network nodes. The drilling dysfunction node is assigned a prior probability
distribution based on the expected frequency for each of the modeled dysfunctions of bit balling, bit bounce, stickslip, whirl and a category of other dysfunctions, such as autodriller and downhole
motor failure.
The posterior probability distribution
of the drilling dysfunction node is updated
at every instant that a drilling activity is
recorded. The outcome of the drilling
dysfunction node corresponding to no
dysfunction detected yields the instantaneous value of the drilling optimization
index. The probabilistic formulation naturally results in a drilling optimization
index between 0 and 1, with 0 being inefficient and 1 being optimal drilling.
When the index approaches 0, dysfunctions
are defined and the system recommends
actions to mitigate them. Because the
system also displays variation of the
index with depth, the driller is able to
easily see how formation changes impact
drilling performance (Figure 2).

FIGURE 2
Drilling Optimization Flow Chart
Start

Stop

NO

Data stream
available
YES

Read surface torque,
rotary speed, WOB, ROP,
differential pressure, and
control setpoints
Synchronize data
arriving at different
sampling frequencies
Pre-process data (remove
outliers, null/missing
values, summarize high
frequency data)

Update drilling
optimization index using
value of NONE outcome in
DRILLING_DYSFUNCTION
node

Aggregate location and
movement features in
Bayesian network and
perform Bayesian inference

Compute moving
average of drilling
optimization index over
a pre-defined time/
depth interval

Compute probabilities
for location and
movement features

Report moving average of
drilling optimization index
and drilling dysfunction
beliefs on rig display

Calculate mechanical
specific energy, bit
aggressiveness, stick slip
alarm magnitude

Identify rig activity

Rig activity is
DRILLING

Update drilling
dysfunction beliefs using
outcome probabilities in
DRILLING_DYSFUNCTION
node

Drilling optimization
index below specified
threshold

NO

YES

YES

NO

Optimization Index
Driller buy-in of automated decisionsupport systems is critical to their success,
but is often overlooked by innovators.
Because few drillers are familiar with
such concepts as Bayesian networks and

Provide
recommendation for
improving drilling
performance

MSE, developers of the new methodology
placed significant emphasis on human
factors when implementing it. Besides
including the easily understood cone
drilling display, they designed the drilling
optimization parameter to be displayed

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APRIL 2018 129


http://www.EnventureGT.com/ESET

American Oil and Gas Reporter - April 2018

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

Contents
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