Which device anchors the tubing to the casing and provides a sealing function?

Which device anchors the tubing to the casing and provides a sealing function?

• A. Packers
• B. Mandrels
• C. Subsurface safety valves
• D. Centralizers

Answer: (A)

Packers seal the annulus between the production tubing and the surrounding casing and provide an anchor for the tubing string. They use a sealing element that expands to create a fluid-tight barrier and slips that grip the casing to hold the tubing in place. This combination lets operators isolate sections of the well, control pressure, and prepare for cementing or completion operations. A mandrel is just an internal support component, not a sealing/anchoring device; centralizers keep the tubing centered but don’t seal, and subsurface safety valves are valves to control flow, not devices for anchoring and sealing the tubing to the casing.

Packers seal the annulus between the production tubing and the surrounding casing and provide an anchor for the tubing string. They use a sealing element that expands to create a fluid-tight barrier and slips that grip the casing to hold the tubing in place. This combination lets operators isolate sections of the well, control pressure, and prepare for cementing or completion operations. A mandrel is just an internal support component, not a sealing/anchoring device; centralizers keep the tubing centered but don’t seal, and subsurface safety valves are valves to control flow, not devices for anchoring and sealing the tubing to the casing.