ASET Technology Alberta Fall 2023 - 40

Evaluation of Active Impedance
Matching Stick-Slip Mitigation
ACADEMIC INSTITUTION: SAIT
ENGINEERING TECHNOLOGY DISCIPLINE: PETROLEUM
ENGINEERING TECHNOLOGY
TEAM MEMBERS: VIKAAS (VIK) KALSI, ANDRE FUGISSAWA
T
This project focused on an application developed
by the company Precision Drilling to counteract
stick-slip, which is a relevant invisible
lost time (ILT) contributor that can lead to nonproductive
time (NPT). This app is called Z-Torque. Ultimately
the goal of Z-Torque is to optimize drilling performance by
reducing damaging torsional vibrations, and allow for more
efficient drilling.
The project aims to: evaluate the relationship between an
impedance intensity setting (Z-Torque percentage), surface
stick-slip index (SSSI), rate of penetration (ROP), torque,
depth, and formation; and examine the associated value
(worth) of this technology.
The goal was to create a guideline for using Z-Torque effectively
at different depths to minimize stick-slip and enhance
drilling efficiency. To achieve this, the project team examined
electronic drilling recorder (EDR) data to find correlations
between Z-Torque percentage and SSSI. Understanding the
factors causing stick-slip and their impact on Z-Torque percentage
was crucial for success.
In looking at the relationships between Z-Torque percentage,
SSSI, ROP, depth, and formation it is possible to pinpoint
the most effective Z-Torque percentage setting that could
simultaneously reduce stick-slip severity index (SSSI) and
enhance the rate of penetration (ROP), all while considering
the variables of depth and formation. The project started with
the collection of EDR time-based raw data sampled at 1Hz.
A data quality assurance process was then implemented in
alignment with the established methodology. This included
data compilation and categorization by filtering for on bottom
rotary drilling data that excluded all null values. Furthermore,
specific scenarios were located within the datasets for each
formation where drillers had used two or more Z-Torque settings
for a minimum of 10,000 data points in a similar depth
interval. It was then possible to complete SSSI calculations
and compare the impact of different Z-Torque settings on
SSSI and ROP.
Using the collected data, a comprehensive performance
analysis of SSSI and ROP for each available Z-Torque setting
by formation was conducted to determine if Z-Torque was
decreasing stick-slip and which Z-Torque percentage setting
the best SSSI/ROP improvement was seen with. The results
for each of the four wells examined were analyzed separately
and in combination to calculate SSSI/ROP averages for each
of the Z-Torque settings.
Under implementation of the Z-Torque system, a consistent
improvement was observed in drilling performance. The improvement
amounts to approximately 4.5 additional triple
stands per day when compared to Z-Torque off.
With the system active and set to the optimum Z-Torque setting
found for each of the five formations evaluated, surface
stick-slip severity levels decreased by 26 per cent and the
average rotary ROP for this period increased by 17 per cent
because of the improved mechanical specific energy (MSE)
transfer achieved by the reduction in torsional vibrations.
We can also see a variety of secondary benefits that result
from the primary benefits. The secondary benefits include
improved ILT and NPT such as: less bit trips, better dull grading,
and less wear or damage to the drill string and its components.
The primary benefits alone amounted to a $6.7k
savings over 376m of on-bottom rotary drilling, out-costing
the Z-Torque rates of $500 /day and proving the effectiveness
of Z-Torque when implemented correctly.
40 | FALL 2023 | TECHNOLOGY ALBERTA

ASET Technology Alberta Fall 2023

Table of Contents for the Digital Edition of ASET Technology Alberta Fall 2023

ASET Technology Alberta Fall 2023 - Cover
ASET Technology Alberta Fall 2023 - A1
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ASET Technology Alberta Fall 2023 - Cover2
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