Related Oil & Gas Terms

• Caisson-type platform rig

  A rigid offshore drilling platform that stands on steel caissons and is used to drill development wells. the caissons are firmly affixed to the seafloor, and the drilling and production decks are laid on top of them. the platform is used in certain arctic waters, where the caissons are needed to protect equipment from moving...

• Platform rig

  An immobile offshore structure from which development wells are drilled and produced. platform rigs may be built of steel or concrete and may be either rigid or compliant. rigid platform rigs, which rest on the seafloor, are the caisson-type platform, the concrete gravity platform, and the steel-jacket platform. compliant platform rigs, which are used in...

• Bottle-type submersible rig

  A mobile submersible drilling structure constructed of several steel cylinders, or bottles. when the bottles are flooded, the rig submerges and rests on bottom; when water is removed from the bottles, the rig floats. the latest designs of this type of rig drill in water depths up to 100 feet (30.5 meters). see submersible drilling...

• Guyed-tower platform rig

  A compliant offshore drilling platform used to drill development wells. the foundation of the platform is a relatively lightweight jacket upon which all equipment is placed. a system of guy wires anchored by clump weights helps secure the jacket to the seafloor and allows it to move with wind and wave forces. see platform rig....

• Semisubmersible drilling rig

  A floating offshore drilling unit that has pontoons and columns that when flooded cause the unit to submerge in the water to a predetermined depth. living quarters, storage space, and so forth a reassembled on the deck. semisubmersible rigs are either self-propelled or towed to a drilling site and either anchored or dynamically positioned over...