What prevents a hole of a well from caving in and seals off formations?

What prevents a hole of a well from caving in and seals off formations?

• A. Liners
• B. Casing
• C. Cement
• D. Packer

Answer: (B)

Casing. It’s the steel pipe run into the well and cemented in place that acts as a rigid wall, resisting rock pressure and keeping the borehole from collapsing. Once the casing is set, cement is used to bond it to the borehole wall and seal the annulus, which helps isolate formations and fluids. Liners are partial casing used in portions of the well, and packers isolate zones but don’t provide the overall structural support to prevent caving. So, the casing provides the essential structural protection and the primary barrier to seal off formations.

Casing. It’s the steel pipe run into the well and cemented in place that acts as a rigid wall, resisting rock pressure and keeping the borehole from collapsing. Once the casing is set, cement is used to bond it to the borehole wall and seal the annulus, which helps isolate formations and fluids. Liners are partial casing used in portions of the well, and packers isolate zones but don’t provide the overall structural support to prevent caving. So, the casing provides the essential structural protection and the primary barrier to seal off formations.