Tommy Najar | 7 months ago
Technical Content

Offshore Waterfloods

And the importance of PREN

Waterflood injection wells for pressure maintenance are a critical component of optimizing recovery factors of oil reservoirs. In deepwater environments, it becomes more critical to design the wells and facilities to minimize failures caused by corrosion because the loss of an injection well due to failure directly impacts production rate and LOE.
With respect to tubular design, PREN stands for Pitting Resistance Equivalent Number. It provides a relative comparison of the resistance of alloys to localized corrosion based upon their chemical composition. Various empirical formulas have been developed for the calculation of the PREN. NACE MR0175 requires the use of the following equation:
PREN = CR% + 3.3 x (Mo% + 0.5 + W%) + 16 x N%
It is recommended that materials have a PREN > 40 for seawater injection applications. This provides an added level of security to the challenges that come with the presence of oxygen contamination. Super 25Cr is one of the most commonly used alloys for waterflood injection due to the PREN of 40+.
Current global challenges impacting market stability have an impact on mill lead times for Super 25Cr. PipeSearch has the following typical long lead delivery items available in short notice:

7" 29# 25CRS-80 Vam 21 R3

This material is perfectly suited for an offshore water injector. PREN > 40. PREN stands for Pitting Resistance Equivalent ... Read More

Quantity: 9600.000 FT

Condition: Unused

Mill Year: 2015

Manufacturer: Vallourec

Location: Coevorden, Netherlands


7" 32# 25CRW-125 Vam Top HC R2

This material is well suited for an offshore water injection project. Pitting Resistance Equivalent Number: PREN > 40. PREN... Read More

Quantity: 22734.000 FT

Condition: Unused

Mill Year: 2012

Manufacturer: Sumitomo



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