How Advanced Leak Detection Prevented an Unplanned Stack Pull During BOP Stump Testing

Situation

During a routine offshore BOP stump test, standard validation indicated acceptable results with no clear signs of failure. Pressure readings were stable, no alarms were triggered, and the system met conventional pass criteria.

However, traditional BOP pressure testing is designed to detect leaks, not subtle emerging issues. In this case, the system would likely have been cleared for deployment with an undetected integrity risk.

Solution

To validate the test results more deeply, IPT Global’s Field Advisor applied SureTec® advanced leak detection analysis. Rather than relying solely on pass/fail thresholds, this approach evaluates:

• Pressure behavior over time
• Deviation from expected system response
• Early-stage anomalies in high-resolution data

This deeper analysis identified a subtle but consistent degradation in pressure trend; behavior inconsistent with a fully sealed system and easily overlooked using conventional methods.

Results

Following the analysis:

• A targeted inspection was conducted
• A leak was confirmed in the lower pipe ram’s outer door face seal
• Repairs were completed prior to offshore deployment

Operational Impact

By shifting the focus from “Did the test pass?” to “Does the data behave like a truly sealed system?”, the analysis uncovered a developing leak that would have otherwise gone unnoticed. Early leak detection enabled proactive intervention, delivering measurable value:

• Prevented a potential unplanned stack pull
• Avoided non-productive time (NPT)
• Eliminated significant operational and logistical costs

Lessons Learned

This case reinforces a critical insight in traditional well control operations: passing a BOP pressure test does not guarantee system integrity. Subtle leaks can evade standard validation methods, progress under real operating conditions, and lead to high-impact offshore failures if left undetected.

By moving beyond pass/fail testing and understanding how pressure behaves over time, operators can detect what others miss, protecting both operations and the bottom line.