Corrosion Inhibitor has specific properties and it may not fully compatible when "meets" with others chemicals. Some findings from laboratory and field has been observed for this phenomena.

1. CORROSION INHIBITOR
INJECTION
COMPATIBILITYWITH
OTHERS CHEMICALS
BONY BUDIMAN
AUGUST 2020

2. PHILOSOPHY
• Each chemical has specific characteristic due to its chemical composition such as pH,
reactivity and solubility
• It is possible that one chemical will react with another create new substance, create new
phases, change color or increase heat.
• Chemical reaction may decrease its original performance

3. COMPATIBILITY
BETWEEN CHEMICALS
• Compatibility between Scale Inhibitor (SI) and Corrosion Inhibitor (CI)
• Compatibility between CI and Oxygen Scavenger (OS)

4. CORROSION INHIBITOR PROPERTIES
• Corrosion Inhibitor that used in the oil and gas facility basically contain amine compound
as the active content
• Amine is an alkaline
• To create stability and improve performance, formulator may add mutual solvent,
surfactant and acid.
• As final product some corrosion inhibitor may has pH below 5.

5. SCALE INHIBITOR PROPERTIES
• Scale Inhibitor that used in the oil and gas facility basically contain phosphonate
compound as the active content
• Phosphonate is an acid
• To reduce acidity, formulator may add pH adjuster

6. OXYGEN SCAVENGER PROPERTIES
• Oxygen Scavenger that used in the oil and gas facility has wide range of active content
such as sulphite, hydroquinone, and hydrazine-carbohydrazide
• Oxygen scavenger is a reductor, it will react with the oxygen scavenger then it will
oxidized.
• As reductor, OS may react with others chemicals.

7. COMPATIBILITY BETWEEN
SI AND CI

8. CI SI
a. Wrong position
b. Poor distance

9. COMPATIBILITY EFFECT OF
SI AND CI ON
SCALE INHIBITION EFFECTIVENESS
Sample % Effectiveness SI
CI then SI
2.6
2.4
2.6
SI then CI
6.1
5.9
6.1
SI only
5.2
5.2
Blank 0.0
0,0
1,0
2,0
3,0
4,0
5,0
6,0
7,0
8,0
CI then SI SI then CI SI only
%
Effectiveness
(x10)
Chemicals Added
CI Effect To SI Performance
1. Add CI to the test
solution, after 5
seconds add SI to the
same test solution
2. Do an effectiveness
test refer to NACE
TM0374
3. Repeat step 1-2 by
changing steps of
adding chemicals
4. Add CI first will
decrease SI
performance up to 40%

10. CI vs SI to Corrosion Protection Effectiveness
88.5
89.5
90.5
91.5
92.5
93.5
94.5
CI then
SI
SI then
CI
CI Only CI Only
Chemicals Test
%
Protection
If CI injected first, it will react with SI so the effectiveness will decrease
Compatibility Effect of SI and CI
on Corrosion Inhibition 1. Add CI to the test
solution, after 5
seconds add SI to the
same test solution
2. Do a corrosion wheel
test
3. Repeat step 1-2 by
changing steps of
adding chemicals
4. Add CI first will
decrease CI
performance up to 3%

11. CONTACT TIME EFFECT
(SI FIRST THEN CI)
7,5
7,55
7,6
7,65
7,7
7,75
7,8
7,85
1 2 5 10 20 30 60 120 300 Blanko
%
Effectiveness
(x10)
contact time (second)
Contact time effect (SI then CI)
At lab test, SI need 5 second to react completely

12. CI MECHANISM
CO2, O2 CO2, O2,
Before Treatment CI After Treatment CI
CI’s molecules filming the metallic pipe.
The film protect the pipe from chemical corrosion attack

13. Which one must be injected first ?
CI ?
SI ?

14. IF CI ISTHE FIRST ONE :
Remember : CI just filming the metallic and not react with corrosion chemical, then when
CI molecules meet SI molecules :
1. CI and SI can react and weakening both of their effectiveness.
2. Some molecules of CaCO3 were not treated by SI
3. Some part of metallic pipe not filmed by CI
CI molecules
SI molecules
CI-SI reaction
Crystal CaCO3
SI-CaCO3
CI SI

15. IF SI ISTHE FIRST ONE :
Remember : SI react chemically with CaCO3 and destroy its surface , then when
SI-CaCO3 molecules meet CI molecules :
1. SI-CaCO3 not react with CI
2. CI performance not decrease since SI was react to CaCO3
CI molecules
SI molecules
CI-SI reaction
Crystal CaCO3
SI-CaCO3
SI CI

16. FIELD RESULT (ALPHA EOR)
Date CI content (ppm) % Decrease
SI off SI ON
Sept 06 0.60 0.43 40%
Nov 06 (full
stroke CI &SI)
2.96 0.35 85%
Corr
coupon
CI SI
Sampling
point

17. HOW IF CI INJECTION
POINT SWITCH WITH SI
INJECTION POINT ?

18. Field Test of CI-SI at Balam EOR
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
CI then SI SI then CI CI only
Sample
CI
content
(%)
Switch injection point from
CI to SI only gives little
effect since the distance is
too short (< 1 m)
Corr
coupon
SI CI
Sampling
point

19. RECOMMENDATION ON
SI-CI INJECTION POINT
CI SI
WRONG
SI CI
CORRECT
CI
SI
WRONG
CI SI
WRONG

20. COMPATIBILITY BETWEEN
OS AND CI

21. R&DTEST
• Effect if inject OS then CI
• Effect if inject CI then OS
• Parameter check :
• Dissolve oxygen
effectiveness
• Corrosion protection
performance

22. OSTHEN CI
3.00
4.00
5.00
6.00
7.00
8.00
9.00
0 10 20 30
O2
(ppm)
menit ke-
Compatibility Oxy vs CI thdp Effectivitas Oxy
Only Oxy
After 10 min
Inject CI
After 5 min
Inject CI
Oxy Only

23. CITHEN OS
Compatibility CI vs Oxy thdp Efektivitas Oxy
3.00
4.00
5.00
6.00
7.00
8.00
9.00
0 5 10 15 20 25 30
menit ke-
O2
(ppm)
Oxy saja
After 5 min
Inject Oxy after 5 min
After 10 min
Inject Oxy after 10 min

24. THE MEANING OF GRAPHS :
1. Oxy Sca and CI react chemically when they meet each other.
2. Oxy Sca need to inject first to completed its reaction to O2
3. A longer contact time of Oxy Sca gives more effective result

25. EFFECTTO CORROSION PROTECTION

26. 80
81
82
83
84
85
86
87
88
CIthen Oxy(5') Oxythen CI (5')
%
Protection
Chemicals Test
CIvs Oxy to CorrosionProtection
Effectiveness
Corrosion Protection
1. Add CI to the test
solution, after 5
seconds add OS to the
same test solution
2. Do a corrosion wheel
test
3. Repeat step 1-2 by
changing steps of
adding chemicals
4. Add CI first will
decrease CI
performance up to 2%

27. RECOMMENDATION OF OS-CI INJECTION POINT
OS CI
WRONG
OS CI
CORRECT
OS
CI
WRONG
OS CI
WRONG

28. CONCLUSION
• Chemicals that works with chemically mechanism should be injected before chemicals
that works with physically mechanism
• Chemical reaction need enough time to react completely