Abstract: Moving from reactive to proactive maintenance regimes is critical for offshore and remote onshore assets. We examine the transition to condition-based monitoring for wellhead valves.

The Cost of NPT:

In modern drilling operations, NPT can cost operators upwards of $\$50,000$ to $\$250,000$ per day. The primary failure mode in wellhead assemblies is internal leakage across gate valves due to sand erosion or chemical degradation.

• Acoustic Emission (AE) Testing: Unlike ultrasonic testing, AE sensors detect the high-frequency signals generated by turbulent flow (leaks) through a closed valve. By establishing a “baseline” acoustic signature, engineers can identify a 1-2% leak rate long before it becomes a safety hazard.
• Torque Signature Analysis: By monitoring the torque required to cycle a valve (via automated actuators), we can detect stem packing friction or debris buildup. An increasing torque curve is a leading indicator of mechanical interference.
• Implementation: Integrating these sensors into the SCADA system allows for a Digital Twin model. This model predicts the Remaining Useful Life (RUL) of the valve, allowing parts to be ordered and staged before the scheduled turnaround.