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Recommendable Brine for 13CR and Duplex Stainless Steel

C-Steel
13Cr
13CRS, 13CRM
22 (Duplex s.s)
Corrosion*1
Corrosion*2
Corrosion
Pitting*3
SCC*4
NaCI
Δ
O
O
Δ
O
CaCI2
Δ
Δ
X
X
X
MgCI2
O
Δ
X
X
O
ZnCI2
X
X
X
O
O
NaBr
O
O
O
Δ
—
CaBr2
Δ
Δ
O
Δ
O
MgBr2
Δ
Δ
—
Δ
—
ZnBr2
X
X
—
O
O
* Autoclve test 150°C, 0.4MPaCO2    
*1 O : C.R. 1g/m2/h *2 O : C.R. 0.1 *3 O : Vp 0.3V *4 O : Crack Free
  Δ : 1<C.R._10   Δ : 0.1<C.R.1.0   Δ : 0<Vp<0.3   X : Crack
  X : C.R.>10   X : C.R.>1.0   X : Vp 0    

 

Brine with a corrosion inhibitor, a biocide, and an oxygen scavenger added is acceptable as a completion fluid but careful investigation is required at selection brine and additives as a packer fluid. An oil base solids free packer fluid is recommended, either diesel oil with a corrosion inhibitor additive or one of the proprietary oil base packer (Drilling) fluids.

All fluids pumped into wells equipped with stainless steel materials should be adequately deoxygenized. Any additives to completion brines and or packer fluids such as corrosion inhibitors, biocide, etc, should be carefully selected to avoid possible degradation with time and subsequent negative effect on stainless steel integrity. Generally oil based solids free packer fluids such as diesel oil are acceptable.

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