Q1: What corrosion mechanisms affect CO2 transport pipes?
A1: Wet CO2 forms corrosive carbonic acid. Impurities like SOx create additional acids. These factors require careful material selection and monitoring.
Q2: Why are compression and dehydration critical for CO2 pipes?
A2: Maintaining supercritical conditions prevents phase separation. Dry conditions (<50 ppm water) prevent corrosion. These controls ensure safe pipeline operation.
Q3: What materials are used for CO2 injection wells?
A3: 13Cr stainless steels handle most reservoir conditions. Some fields require nickel alloys for higher contaminants. Material selection depends on downhole chemistry.
Q4: How are existing pipelines assessed for CO2 service?
A4: Fitness-for-service evaluations check material compatibility. ILI tools measure wall thickness and defects. These assessments determine required upgrades.
Q5: What safety systems protect CO2 pipelines?
A5: Emergency shutdown valves isolate sections. Leak detection systems use flow monitoring. These protections address CO2's unique hazards.
