Oilfield Terminology & Definitions.
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Offshore & Subsea

Offshore and subsea operations involve extracting hydrocarbons from reservoirs located beneath the ocean floor. These activities use specialized platforms, pipelines, and remotely operated vehicles to drill, produce, and maintain wells in deep water environments.

  • AUV
    31

    An AUV, or Autonomous Underwater Vehicle, is a self-propelled, unmanned robotic platform used extensively in the offshore oil and gas industry for subsea survey, inspection,…

  • Blowout Preventer (BOP)
    28

    A Blowout Preventer (BOP) is a large, specialized valve or set of valves installed at the top of a wellbore, typically on the seafloor in…

  • Drillship
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    A drillship is a specialized maritime vessel designed for offshore drilling operations, particularly in deepwater and ultra-deepwater environments. Unlike fixed platforms or semi-submersibles, a drillship…

  • Flowline
    92

    A flowline in offshore and subsea oil and gas operations is a specialized pipeline that transports the full wellstream—a mixture of crude oil, natural gas,…

  • FPSO
    46

    FPSO stands for Floating Production, Storage, and Offloading. It is a floating vessel used by the offshore oil and gas industry to produce, process, store,…

  • Hydrocarbon Plume
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    A hydrocarbon plume is a discrete, three-dimensional volume of elevated hydrocarbon concentration within the water column, typically originating from a subsea release such as a…

  • Jack-Up Rig
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    A Jack-Up Rig is a mobile, self-elevating offshore drilling or workover platform used in shallow to moderate water depths, typically up to 400 feet (120…

  • Jacket
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    In offshore oil and gas engineering, a jacket is a fixed steel substructure that supports a topside platform above the water surface. It typically consists…

  • Manifold
    27

    A manifold in offshore and subsea oil and gas operations is a critical piece of equipment that serves as a central hub for routing, controlling,…

  • Mooring System
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    A mooring system is a permanent or semi-permanent arrangement of anchors, chains, wire ropes, synthetic lines, and connectors used to secure a floating offshore structure…

  • Pipeline
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    A pipeline in the offshore and subsea context is a long-distance, continuous conduit system designed for the bulk transportation of hydrocarbons—crude oil, natural gas, and…

  • Riser
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    A riser is a critical conduit in offshore and subsea oil and gas operations that connects a subsea wellhead or a subsea production system to…