How should temporary outer surface casing be handled during well construction?

During well construction, the proper handling of temporary outer surface casing is crucial to ensure the integrity and safety of the well. The correct practice is to withdraw the temporary outer surface casing as sealing material is placed. This allows the sealing material to effectively fill the annular space and create a proper seal. The removal of the casing while placing the sealing material helps in preventing any contamination of the groundwater and ensures that the sealing material can set properly against the surrounding soil and rock formations.

When the temporary casing is removed, it creates a more effective barrier against potential contaminant migration and enhances the long-term stability of the well structure. This is a standard procedure in the drilling industry to maintain water quality and well integrity over time.

In contrast, leaving the temporary casing permanently in place could hinder proper sealing and may lead to contamination issues. Burying the casing underground would also defeat its purpose, preventing access or proper sealing techniques from being applied. Reinforcing the casing with additional materials is unnecessary and could complicate the well construction process without addressing the primary need for a properly sealed well.