brimmer
Petroleum
- Mar 26, 2007
- 349
Hello,
I have a question regarding choice of material for downhole gas production well, used for capillary or injection tubing. Normally the spec used for a scenario like this is Inconel 625 (0.5", 0.083" wall). However material is not readily available, lead time to long to wait. I was given the following alternatives available:
Inconel 825
A 2205
A 2507.
Environment is downhole, BHT 122C (252F), pressure 8.5-9MPa (1233-1885psi), 20% H2S, 6% CO2, elemental sulfur present, no or trace chlorides.
Internal tube service won't be much of an issue as it will essentially carry fresh water.
We error on the side of conservative, so normally use the inconel 625, we want to install and forget. Which of the above options would be best for corrosion/pitting/SSC/SCC resistance? To me it would seem the inconel 825, would perhaps be similar to 625, with slighlty less resistance due to less Ni, but still has relatively high concentration. It appears A 2507 generally better than A 2205, but we don't have to worry about chlorides here. Any comments on suitability of these materials to conditions or similar materials would be appreciated. Thank you.
I have a question regarding choice of material for downhole gas production well, used for capillary or injection tubing. Normally the spec used for a scenario like this is Inconel 625 (0.5", 0.083" wall). However material is not readily available, lead time to long to wait. I was given the following alternatives available:
Inconel 825
A 2205
A 2507.
Environment is downhole, BHT 122C (252F), pressure 8.5-9MPa (1233-1885psi), 20% H2S, 6% CO2, elemental sulfur present, no or trace chlorides.
Internal tube service won't be much of an issue as it will essentially carry fresh water.
We error on the side of conservative, so normally use the inconel 625, we want to install and forget. Which of the above options would be best for corrosion/pitting/SSC/SCC resistance? To me it would seem the inconel 825, would perhaps be similar to 625, with slighlty less resistance due to less Ni, but still has relatively high concentration. It appears A 2507 generally better than A 2205, but we don't have to worry about chlorides here. Any comments on suitability of these materials to conditions or similar materials would be appreciated. Thank you.
