Downhole Corrosion Factors
1) Acidic corrodants: CO2, H2S in drilling fluid.
2) Solids: High solids content in drilling fluid prompts the erosion and flow assisted corrosion.
3) Oxygenated conditions: The drilling fluid is often oxygenated during drilling process.
4) Microbial: Microbial growth may produce more corrosive H2S, CO2, and organic acid. It may also depolarise the metal surface.
5) Stress: Deeper drilling means longer string and higher stress level. Corrosion fatigue cracks and creep under higher temperature are often leading to failure.
6) Stagnant conditions: It is common that packing fluid used in drilling is stagnant for long time.
7) Temperature: High bottom hole temperature leads to more aggressive fluid corrosivity. Higher temperature also requires higher thermal stability for materials(e.g. tubing, chemicals etc.) used in downhole applications.
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