Challenges posed by the hostile environmental characteristics of Brazilian presalt oil and gas fields have prompted Petrobras to weigh use of rigid risers instead of flexible risers, which are mostly used by the company offshore Brazil.
Such characteristics include polluting gases, specifically CO2. Challenges have resulted in what experts call stress corrosion cracking (SCC). SCC causes riser structures to fail, suspending production of fields and threatening the environment with possible oil and gas leaks. Petrobras is evaluating how flexible risers can be improved to avoid corrosion during E&P presalt activities.
The company’s eyes were opened to the problem after there were two failures regarding TechnipFMC-supplied risers in 2017 in the Lula and Sapinhoá presalt fields, two of the company’s top-producing fields. The incidents prompted Petrobras to think about changing its pipeline connections in presalt fields, using rigid risers.