What is an additional step in soft shut-in procedures while tripping that differs from drilling?

During tripping operations, an additional step involves the use of the full opening safety valve, which serves as a safety mechanism to prevent any potential influx while the drill string is being pulled from the well. This step is crucial since tripping entails the removal of the drill string from the well, presenting a different set of hazards compared to standard drilling operations.

When the full opening safety valve is stabbed and closed, it provides a positive seal and helps control the wellbore pressure, reducing the risk of kicks or blowouts during this particularly vulnerable phase. It is an extra precaution specifically tailored to manage the unique challenges that arise when the drill string is being removed. This action underscores the added complexity and heightened safety measures required during tripping compared to regular drilling activities, where this step is not necessary.

In summary, the use of the full opening safety valve enhances safety by providing additional pressure control measures uniquely relevant to the tripping process, making it a critical step not present in standard drilling procedures.