American Oil and Gas Reporter - January 2020 - 77

Tech Trends
the operator also reduced EOU in the
well to enable more accurate wellbore
placement (Figure 2).

FIGURE 2
EOU Comparison in Permian Basin Well (Solid-State Gyro versus MWD)

Tight Lateral Spacing
7,900
7,800
7,700

North (ft)

7,600
7,500
7,400
7,300
7,200
7,100
7,000

-2,200

-2,000

-1,800

East (ft)
Solid-State Gyro

MWD

FIGURE 3
EOU Comparison in DJ Basin Well (Solid-State Gyro versus MWD)
750
625
500
South [-]/North [+] (ft)

A Denver-Julesburg Basin operator
was drilling a horizontal well in a westerly
direction using traditional MWD surveys.
The well was being drilled from a pad
with a high density of existing wells and
rapid drilling operations, preventing the
use of real-time MSA corrections and/or
wireline operations.
While typically MWD surveys had
been sufficient, the operator's application
in this instance required extremely tight
and accurate lateral spacing to be successful. With the objectives of minimizing
survey error and to ensure precise well
spacing, the operator decided to implement
the solid-state gyro system based on its
ability to survey at all inclinations with
much higher accuracy than otherwise
available (Figure 3).
Using three orthogonal solid-state
gyroscopes, the system effectively eliminated errors in the east/west surveys.
The operator intended to survey the
entire well while tripping out of hole to
identify the definitive bottom-hole location. The gyro data enabled the operator to correct the bottom-hole location
by 91 feet while reducing the EOU by
65%. Using the system in drop mode
allowed the operator to avoid an estimated 10-12 hours of rig time from
running a time-consuming, costly wireline operation.
In addition, the operator saved more
than $60,000 in costs associated with the
equipment and personnel that would have
been necessary with a traditional system.
Given the success of this deployment,
the operator intends to use the solid-state
technology on his next five wells, which
when combined with the first well, is estimated to achieve total savings in excess
of $360,000.
The relevance of wellbore placement
will only increase as the technical and

375
250
125
0
-125

-750 -625 -500 -375 -250 -125

0

125

250 375 500 625
West [-]/East [+] (ft)

750

875 1,000 1,125 1,250 1,375 1,500 1,625
Solid-State Gyro

MWD

JANUARY 2020 77



American Oil and Gas Reporter - January 2020

Table of Contents for the Digital Edition of American Oil and Gas Reporter - January 2020

Contents
American Oil and Gas Reporter - January 2020 - Intro
American Oil and Gas Reporter - January 2020 - 1
American Oil and Gas Reporter - January 2020 - 2
American Oil and Gas Reporter - January 2020 - Contents
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https://www.nxtbook.com/nxtbooks/aogr/202407
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