4.70M

Y-307H1_MBTT4_18OCT2025_PRELIMINARY SUMMARY

1. YIBAL-307H1

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

2.

Job objectives, toolstring
Logging interval:
Main pass – 5.0-1424.0 mbdf
Repeat pass – 5.0-105.0 mbdf
Objective:
Evaluate the 3 ½” tubing, the
7” scab liner, and the 9 5/8”
intermediate casing.

Overall logged interval
ПЛАНШЕТ ДАННЫХ ГИС ПО СКВАЖИНЕ
Depth, m
Well sketch
GR, CCL
P, T
GR, GAPI
Pressure, kPa
M 1:8000
0
80 -1000
CCL, mV
-25
25 40
Temperature, оС
Скв ажина 307 YIBAL 0.0 - 1450.0 м
Medium zonde
M10, mV
15000 15
100.0
150.0
200.0
250.0
300.0
350.0
400.0
450.0
500.0
550.0
600.0
650.0
700.0
750.0
800.0
850.0
900.0
950.0
1000.0
1050.0
1100.0
1150.0
1200.0
1250.0
1300.0
1350.0
1400.0
L20, mV
65 -30
48 350
M20, mV
100 -14
M14, mV
-45
L31, mV
1000 0
30 -50
750 -60
250
L36, mV
450 -95
L29, mV
7 -250
450
L33, mV
L26, mV
17 -220
M24, mV
20 -20
Long sonde
L23, mV
M22, mV
50 -18
M16, mV
50.0
Long sonde
M18, mV
170 -6
M12, mV
-45
Medium zonde
130
L39, mV
215 -120
62

5.

Zoomed interval (3 ½” tubing corrosion, eccentricity, and over-magnetized zones)
ПЛАНШЕТ ДАННЫХ ГИС ПО СКВАЖИНЕ
Depth, m
Well sketch
Medium zonde
Скв ажина 307 YIBAL 1300.0 - 1370.0 м
M10, mV
15
170
M 1:450
M12, mV
-26
100
M14, mV
-40
50
M16, mV
-36
Tubing packer
assembly
Overmagnetized
zones
Tubing minor
corrosion
1350.0
Eccentricity
effect
20

6.

Preliminary summary description
Data quality and correlation
The recorded MBTT data has good quality. Correlation was done based on the open hole gamma ray provided by the client. All depths are in mbdf.
3 ½” & 4 ½” tubing
The tubing has minor corrosion at 774.6-776.5 mbdf and 1338.0-1343.5 mbdf. Ther is an interval of possible metal loss at 889.9-891.8 mbdf unless attributable to
specific localized pipe properties or over-magnetize effect. There are multiple zones of severe eccentricity between the 3.5” tubing and the 9 5/8” casing at 946.01010.0 mbdf and 1031.0-1424.0 mbdf. This effect may be reflected in thickness calculation accuracy for the 1st and 2nd barriers. Each tubing join has two-overmagnetized areas leading to increased level of the signal fluctuation across the MBTT4 channels corresponding to the 1st barrier which may affect the accuracy of the
tubing metal loss calculation and mask localized corrosion intervals. Tubing packer assembly was detected at 1303.5-1309.4 mbdf.
7” scab/production liner
The liner has no corrosion (above the accuracy of calculation for the second barrier (7%). The gap between scab and production liners was detected at 1314.8-1316.3
mbdf. The effect of over-magnetization from the 3.5” tubing increases the level of the signal fluctuation across the MBTT4 channels corresponding to the 2nd barrier ,
which may affect the accuracy of the liner metal loss calculation and mask localized corrosion intervals.
9 5/8” intermediate casing
The casing has no corrosion (above the accuracy of calculation for the second barrier (10%). The effect of over-magnetization from the 3.5” tubing increases the level
of the signal fluctuation across the MBTT4 channels corresponding to the 3rd barrier , which may affect the accuracy of the casing metal loss calculation and mask
localized corrosion intervals. The casing shoe was detected at 1374.6 mbdf.
13 3/8” surface casing
Since the 13 3/8” casing is the 4th pipe in this configuration, thickness and metal loss were not calculated. The casing shoe was detected at 800.4 mbdf.

7.

Corrosion summary and metal loss calculation accuracy
Pipe
Thickness calculation
accuracy, %
Corroded interval, mbdf
Metal loss,
%
Top
Bottom
Max
Level of corrosion
Integrity status
3 1/2” tubing
5
774.6
776.5
7.5
Minor
Pass
3 1/2” tubing
5
1338.0
1343.5
8.7
Minor
Pass
7” liner
5
None
None
None
None
Pass
9 5/8” casing
5
None
None
None
None
Pass
13 3/8” casing
10
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

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