Which of the following is NOT listed as a type of offshore drilling rig?

Which of the following is NOT listed as a type of offshore drilling rig?

• A. Submersible
• B. Jack-up
• C. Semi-submersible
• D. Ripple platform

Answer: (C)

Understanding the categories used for offshore drilling rigs helps you spot which term isn’t a real type. Submersible rigs are designed to work while part of the hull sits below the surface and can be moved and positioned for shallow-water operations. Jack-up rigs use legs that descend to the seabed and elevate the deck above the water, giving a stable work platform in shallower waters. Semi-submersible rigs are floating platforms kept steady by ballast and pontoons, suitable for deeper water. A Ripple platform isn’t a recognized offshore drilling rig category, so it doesn’t fit with the actual types used in drilling operations.

Understanding the categories used for offshore drilling rigs helps you spot which term isn’t a real type. Submersible rigs are designed to work while part of the hull sits below the surface and can be moved and positioned for shallow-water operations. Jack-up rigs use legs that descend to the seabed and elevate the deck above the water, giving a stable work platform in shallower waters. Semi-submersible rigs are floating platforms kept steady by ballast and pontoons, suitable for deeper water. A Ripple platform isn’t a recognized offshore drilling rig category, so it doesn’t fit with the actual types used in drilling operations.