How are non-ferrous casing materials, such as PVC, handled in mud rotary drilling?

• A. High torque and aggressive handling.
• B. PVC is never used in mud rotary drilling.
• C. Steel sleeves around PVC.
• D. Non-ferrous casing materials are handled with specialized equipment to prevent damage, including avoiding excessive torque, using appropriate fittings, and ensuring drilling fluids are compatible.

Answer: (C)

Non-ferrous casing such as PVC is more vulnerable to damage in the downhole environment, so it’s protected with a preventive method rather than exposed to direct contact with the drill string or formations. A steel sleeve around the PVC acts as a hard, abrasion-resistant shell that takes the mechanical abuse, cushioning and distributing stresses so the PVC inside isn’t crushed or worn away. This setup lets you benefit from PVC’s corrosion resistance while keeping the outer surface and joints protected during rotation, pulling, and handling.

While careful handling, appropriate fittings, and compatible drilling fluids are important general practices, the steel sleeve provides a concrete, protective solution that directly addresses the vulnerability of PVC in mud rotary drilling.