American Oil and Gas Reporter - September 2023 - 67

SpecialReport: Wellbore Construction
considerably slower than the uncontaminated
sample but did not fully plug off
the screens. The field RDF PST results
passed and was similar to both lab sample
test results. The field RDF PST had to
pass three times before being approved
to pull out of the hole and run screens.
Breaker System
As part of the scope of the work, the
breaker system was formulated to remove
the RDF filter cake. Flow-through testing
was conducted using the 3.0-micron aloxite
disc presoaked in base fluid, and then
placed into a double-ended HT/HP cell.
Initial permeability rates were collected
by recording the time in seconds to flow
200 milliliters of base fluid at 5 psi in the
production direction, then calculating an
average rate. Using the RDF, a four-hour
filter cake was built on the disc using 500psi
differential pressure at 164 degrees.
The next step was to decant the residual
water-based RDF, leaving the filter cake
on the aloxite disc, then carefully pouring
the formulated breaker along the interior
FIGURE 1
Wellbore Schematic for
Well Planning
Hole
Size
(in)
Casing
Size
Casing
Program
MD
TVD
Mud Properties
Mud Density Fluid Loss
ROP = 25 (ft/hr)
ROP = 80 (ft/hr)
121⁄4 "
95/8 "
1,623' MD
<9.2
10.5 - 10.8
<16
<8
3,000' MD
4,000' MD
83⁄4 "
7 "
6,100' MD
5,830' TVD
±10.8
10.6
<8
<5
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
240 250 260 270 280 290 300
61⁄8 "
Estimated Well TD
9,000' MD
5,755' TVD
10.8
<5
Pump Output Rate (gpm)
310 320 330 340
350
360
SEPTEMBER 2023 67
ROP = 40 (ft/hr)
ROP = 100 (ft/hr)
ROP = 60 (ft/hr)
05
10
15
20
Particle and Porosity Size (micron)
FIGURE 3
Hole Cleaning Models Based on ROP and Flow Rates
25
30
35
sidewalls of the cell, being careful to not
disturb the filter cake. The cell was heated
to 164 degrees with a differential pressure
of 300 psi. After observing 10 mL of
breakthrough, the cell was shut in and
the breaker allowed to soak for 48 hours.
FIGURE 2
Average ROP and Estimated Wellbore Porosity
Estimated Wellbore Porosity - High
Estimated Wellbore Porosity - Low
Well #1 - Volume Weighted Mean -µM
Well #2 - Volume Weighted Mean -µM
Well #3 - Volume Weighted Mean -µM
Well #1 - ST01 Volume Weighted Mean -µM
After the soak time, the final permeability
rates were established.
After removing the disc from the cell
after permeability was established, a 15%
hydrochloric acid solution was dropped
slowly onto the disc face to observe any
Solids in Annulus (% by volume)
Measured Depth (feet)

American Oil and Gas Reporter - September 2023

Table of Contents for the Digital Edition of American Oil and Gas Reporter - September 2023

Contents
American Oil and Gas Reporter - September 2023 - Intro
American Oil and Gas Reporter - September 2023 - Cover1
American Oil and Gas Reporter - September 2023 - Cover2
American Oil and Gas Reporter - September 2023 - Contents
American Oil and Gas Reporter - September 2023 - 4
American Oil and Gas Reporter - September 2023 - 5
American Oil and Gas Reporter - September 2023 - 6
American Oil and Gas Reporter - September 2023 - 7
American Oil and Gas Reporter - September 2023 - 8
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American Oil and Gas Reporter - September 2023 - 29
American Oil and Gas Reporter - September 2023 - 30
American Oil and Gas Reporter - September 2023 - 31
American Oil and Gas Reporter - September 2023 - 32
American Oil and Gas Reporter - September 2023 - 33
American Oil and Gas Reporter - September 2023 - 34
American Oil and Gas Reporter - September 2023 - 35
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American Oil and Gas Reporter - September 2023 - Cover3
American Oil and Gas Reporter - September 2023 - Cover4
https://www.nxtbook.com/nxtbooks/aogr/202405
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