In reference to drilling rigs, which term describes a rig fitted with long support legs that can be raised or lowered independently?

In reference to drilling rigs, which term describes a rig fitted with long support legs that can be raised or lowered independently?

• A. Platform Rig
• B. Jackup Rig
• C. Submersible Rig
• D. Derrick Rig

Answer: (B)

Rigs with long legs that can be raised and lowered independently are designed to stand on the seabed for drilling. That setup is what defines a jackup rig. When the rig needs to move, the legs are raised and the hull floats or is carried to a new location. Once on site, the legs are lowered to contact the seabed, stabilizing the unit while drilling. Platform rigs are fixed to a platform structure, so they don’t rely on independently moving legs. Derrick rigs describe the drilling hoist structure on top, not the leg system, and submersible rigs use ballast to move or sit on the seabed rather than having tall, independently adjustable legs. So the best answer is jackup rig.

Rigs with long legs that can be raised and lowered independently are designed to stand on the seabed for drilling. That setup is what defines a jackup rig. When the rig needs to move, the legs are raised and the hull floats or is carried to a new location. Once on site, the legs are lowered to contact the seabed, stabilizing the unit while drilling. Platform rigs are fixed to a platform structure, so they don’t rely on independently moving legs. Derrick rigs describe the drilling hoist structure on top, not the leg system, and submersible rigs use ballast to move or sit on the seabed rather than having tall, independently adjustable legs. So the best answer is jackup rig.