AISI 316 FOR DOWNHOLE CASING MATERIAL
AISI 316 FOR DOWNHOLE CASING MATERIAL
(OP)
I'm working for a Client that is going to install AISI 316 for a downhole casing material (on a production well).
The general condition is:
Moreover on ISO 15156-3 Table A.9 (specifically applicable for downhole tubular components), the same restriction above mentioned is given for a better alloy (superaustenitic SS).
My concern is that the table A.2 above mentioned cannot be used for downhole tubular components being this application more stringent for the material selection. Infact the ISO 15156-3 suggest superaustenitic alloy minimum for this application.
My opinion is that the AISI 316 used as a downhole casing equipment is not suitable for the purpose with a fluid of such composition (cause of chloride pitting and HIC risk) and I would suggest them to use a superaustenic alloy or in any case any alloy with a PREN > 40. Even though if the table A.2 can give them some misleading overview of the issue.
What is your suggestion?
Thanks in advance to anyone would give me his experience is such application
The general condition is:
- Temperature 55°C
- P H2S 50 Kpa
- 150.000 mg/l of chlorides
- PH<4
Moreover on ISO 15156-3 Table A.9 (specifically applicable for downhole tubular components), the same restriction above mentioned is given for a better alloy (superaustenitic SS).
My concern is that the table A.2 above mentioned cannot be used for downhole tubular components being this application more stringent for the material selection. Infact the ISO 15156-3 suggest superaustenitic alloy minimum for this application.
My opinion is that the AISI 316 used as a downhole casing equipment is not suitable for the purpose with a fluid of such composition (cause of chloride pitting and HIC risk) and I would suggest them to use a superaustenic alloy or in any case any alloy with a PREN > 40. Even though if the table A.2 can give them some misleading overview of the issue.
What is your suggestion?
Thanks in advance to anyone would give me his experience is such application





RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
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P.E. Metallurgy, Plymouth Tube
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
The other option would be to think about Super Duplex products as against proposed AISI 316 grades. This will be cheaper than Nickel based alloys and moderately expensive that 316 S.S and may be attractive on a cost: lifespan ratio.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
They are 21%Ni 7.5%Mo were 2507 is roughly 7%Ni and 5%Mo.
With Ni at $6/lb and Mo at $12/lb it adds up fast.
The SA alloys are strong, but not as strong as the SD.
The real question is why won't steel work?
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P.E. Metallurgy, Plymouth Tube
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
In general SS has issues hear the top of a well where temps are cooler and acid gas condensation is a big issue.
What inhibitors were you injecting?
How much water? How much CO2?
Realize that you are talking about casing that will be 50x the price and strictly custom made.
You might actually be able to find some 625 tubular, but again be warned about the near top of hole issues.
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P.E. Metallurgy, Plymouth Tube
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
they have high strength, immunity to CSCC, and enough corrosion resistance in an oxygen free environment to survive with little inhibitor treatment.
I have seen fields in the same Cl and pH range using 9Cr 1Mo for decades.
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P.E. Metallurgy, Plymouth Tube
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
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P.E. Metallurgy, Plymouth Tube
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: AISI 316 FOR DOWNHOLE CASING MATERIAL
But not as difficult as getting an austenitic alloy to survive as casing.
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P.E. Metallurgy, Plymouth Tube