Wellbore Integrity Management

A: That's the most common mistake — confusing presence with dominance. The difference matters because CO2 with high chlorides and wet/dry cycling during shut-ins sets up carbonic acid attack, especially where scale breaks down. H2S is below cracking thresholds, oxygen ingress is transient and localized, and chloride SCC only becomes governing in specific alloys and tensile states that aren't implied here.

A: That's the most common mistake — assuming a monitoring barrier controls the initiating event. The difference matters because annulus pressure monitoring doesn't stop leaks; it detects them early. Without it, casing communication can progress until MAWP is exceeded on an outer string, while the other scenarios sit outside what that safeguard ever covered.

A: That's the most common mistake — jumping straight to intuition about gas mobility. The difference matters because a microannulus behaves like a narrow slot; using laminar flow between plates with gas viscosity and limited cross-section lands you in single-digit Sm³/d, not field-scale rates. Cement matrix flow and choking don't control this geometry.

A: That's the most common mistake — reacting before diagnosing. The difference matters because bleed-and-build data is what separates trapped thermal expansion from active communication. Circulation or rate changes can mask the signature and even worsen casing loads.