SR-405H1_MBTT4_17OCT2025_PRELIMINARY SUMMARY

1. SAIH EAWL-450H1

Corrosion log Analysis
Preliminary summary
G&P MENA
17/Oct/2025
© 2024 Halliburton. All rights reserved.

2.

Job objectives, toolstring, well schematic
Logging interval:
Main pass – 8.0-1403.0 mbdf
Repeat pass – 8.0-108.0 mbdf
Objective:
Evaluate the 7” intermediate
casing and the 9 5/8” surface
casing.
The 4 ½” kill string was installed
at the interval from the surface
to 210.0 mbdf.

3.

Overall logged interval
ПЛАНШЕТ ДАННЫХ ГИС ПО СКВАЖИНЕ
Depth, m
Well sketch
FT
GR, CCL
P, T
GR, GAPI
M 1:9000
0
Pressure, kPa
80 -100
CCL, mV
0
Medium zonde
Скв ажина 405 Saih Rawl 0.0 - 1420.0 м
5 29
Temperature, оС
M10, mV
8000 -5
45 -10
35 -2
M16, mV
100.0
200.0
300.0
DZ
400.0
500.0
600.0
JRRHS
ARFQA
700.0
800.0
ARFQS
900.0
1000.0
WANAU
1100.0
WANAC
WANAD
1200.0
WANAE
1300.0
WANAF
WANUU
7 -50
400 -35
75
L36, mV
220 -42
L29, mV
1.7 -120
120
L33, mV
L26, mV
4.5 -90
M24, mV
10 -4
L31, mV
800 -7
L23, mV
M22, mV
20 -4
Long sonde
L20, mV
15 50
M20, mV
M14, mV
-15
Long sonde
M18, mV
70 -1
M12, mV
-17
Medium zonde
35
L39, mV
130 -55
15

4.

Zoomed interval (7” casing)
ПЛАНШЕТ ДАННЫХ ГИС ПО СКВАЖИНЕ
Depth, m
Well sketch
Medium zonde
Medium zonde
Скв ажина 405 Saih Rawl 1050.0 - 1250.0 м
S4, mV
M 1:1250
50
M10, mV
1050 8
S7, mV
-15
S10, mV
-7
45
M14, mV
20 -25
S13, mV
-5
70
M12, mV
150 -17
23
M16, mV
3.2 -33
10
Casing
equipment
(centralizer?)
1100.0
Interval of
7” casing
changes
7” casing
collars
1200.0

5.

Zoomed interval (7” casing)
ПЛАНШЕТ ДАННЫХ ГИС ПО СКВАЖИНЕ
Depth, m
Well sketch
Medium zonde
Скв ажина 405 Saih Rawl 1250.0 - 1400.0 м
M10, mV
M 1:1250
0
100
M12, mV
-27
61
M14, mV
-25
23
M16, mV
-33
1300.0
Intervals of 7”
casing possible
corrosion
10

6.

Preliminary summary description
Data quality and correlation
The recorded MBTT data has good quality. Correlation was done based on the Completion Status Report provided by the client. All depths are in mbdf.
7” intermediate casing
The casing calculated thickness has no deviation from nominal thickness above the accuracy of 5-7%.
Some casing joints has two over-magnetized zones that leads to increased fluctuation level for MBTT4 Short and Medium sondes latest time domain. This
effect can mask localized casing corrosion.
The casing shows indications of metal loss (unless attributable to specific pipe properties or over-magnetize effect) that fall below the calculation accuracy for
the first barrier (5%) at the following intervals: 921.3-932.6 mbdf, 1113.0-1147.3 mbdf, 1150.4-1157.5 mbdf, 1160.9-1182.4 mbdf, 1239.7-1287.3 mbdf, 1342.61375.8 mbdf (see slide 5). These intervals were not included in the “Corrosion Summary Table,” as the calculated metal loss percentages are below the tool’s
accuracy threshold.
It should be noted that there is a drastic drop of the amplitude on the early time domain channels of the MBTT4 Short/Medium/Long sondes at the depth
1113.2 mbdf (see Slide 4). Considering the increasing deviation across the overall bottom section of the log at 1060.0-1403.0 mbdf from 10 to 50 degrees,
such changes of MBTT4 data could be related to deviation effect and possible casing deformation. It is recommended to conduct specific survey for further
deformation evaluation.
In addition, casing equipment (possibly centralizer) was detected right below the amplitude drop point at 1115.6 mbdf, as well as below at 1167.0 mbdf, 1217.7
mbdf, 1268.7 mbdf, and 1370.5 mbdf.
9 5/8” surface casing
The casing calculated thickness has no deviation from nominal thickness above the accuracy of 7-10%.
The casing shoe was detected at 497.5 mbdf.

7.

Corrosion summary and metal loss calculation accuracy
Pipe
Thickness
calculation
accuracy, %
7” casing
9 5/8” casing
Corroded interval, mbdf
Metal loss, %
Top
Bottom
Average
Max
Level of
corrosion
Integrity
status
5
None
None
None
None
None
Pass
7
None
None
None
None
None
Pass
The MBTT is an electromagnetic-based corrosion tool that provides an average circumference metal loss calculation. The
accuracy of the metal loss calculation is 5% for the 1st barrier, 7% for the 2nd barrier, and 10% for the 3rd barrier.
GRADES OF METALL LOSS, %
Color
Loss, %
Grade / Integrity status
0
None
5 (7) - 10
Minor (7% for the 2nd barrier) / Pass
10 - 20
Moderate / Pass
20 - 100
Extensive / Fail

8.

THANK YOU