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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →An oil rig is the equipment used to drill a well into rock; it is not necessarily the entire oil field or the facility that later produces oil and gas. A rig bores the well, while platforms, subsea equipment, and other infrastructure may support production after drilling. The setup depends on whether the well is on land or offshore, and offshore arrangements vary with water depth.
What is an oil rig in an oil field?
An oil field is an area where wells and related infrastructure are used to find and produce oil or natural gas. The rig is the equipment assembled to drill a well. People sometimes call a whole offshore installation an “oil rig,” but the term can blur several distinct things:
- Drilling rig: equipment that bores the well. It may be a land rig, a mobile offshore unit, or equipment operating from a platform.
- Platform: a structure that can hold drilling equipment, storage, and crew facilities offshore. Some platforms also support production.
- Production system: equipment that brings oil or gas from a completed well into processing, storage, or transport. Offshore production equipment may be on a platform or on the ocean floor.
The drilling unit and the long-term production system are not always the same structure. An offshore well may be drilled from a mobile unit, with production later handled by separate platform or subsea equipment. The U.S. Energy Information Administration (EIA) describes both offshore platforms that accommodate drilling and production equipment placed on the ocean floor.
How does a rig drill an oil or gas well?
Drilling is a staged well-construction process. The exact design varies by well, but the general sequence is to drill through rock, secure sections of the hole, and then prepare the well for production.
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- Set up the rig. The rig is assembled at the selected land site or positioned at the offshore drilling location.
- Drill with a bit and drill pipe. The rig lowers a drill bit into the well on a string of connected drill pipe. The drill string transmits power from the rig’s top drive to the bit, which cuts rock. The Alberta Energy Regulator (AER) describes this basic drilling sequence.
- Circulate drilling fluid. Fluid is pumped through the well as drilling proceeds. It carries rock fragments back out and helps manage pressure from fluids or gas in the formation. This helps control the well, but it does not guarantee that a loss of control or blowout cannot occur. The U.S. Department of Energy explains these functions in its Life Cycle of Onshore Operations Paper.
- Install casing and cement. At planned depths, steel casing is placed in the well and cemented in position. Casing supports the hole and provides a route for oil or gas to be brought to the surface.
- Reach total depth and complete the well. Once the well reaches its planned total depth, drilling gives way to completion: work to prepare the well for production. A completion rig is normally used for this stage, according to the AER.
How do land and offshore rigs differ?
The central task is the same—drill a well into a target formation—but the setting determines how the rig is supported and supplied. Offshore projects also require a way to operate safely over water and connect wells to production infrastructure.
| Arrangement | How it is supported | What distinguishes it |
|---|---|---|
| Onshore rig | Set up at a selected land site | Drills from land into the target formation. It avoids the offshore support structures and marine setting. |
| Fixed offshore platform | Platform legs are supported by the seabed | Provides working space offshore for drilling equipment and may also accommodate storage and crew housing. |
| Floating offshore unit or platform | Floats rather than standing on legs embedded in the seabed | Used in deeper water. The EIA describes floating platforms for water depths of 10,000 feet or greater; that figure is water depth, not the depth of the well. |
| Subsea production system | Production equipment is installed on the ocean floor | Can form part of the production arrangement after drilling; it is not itself a drilling rig. |
These are broad arrangements rather than a claim that every field follows one design. A platform can host drilling, but a mobile drilling unit may leave after a well is drilled, and production may be handled elsewhere. The EIA says offshore production is much more expensive than onshore production, though the cited material provides no general cost figure.
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What do rig counts and offshore statistics tell you?
Rig counts describe drilling activity, not the number of oil fields or producing facilities. Their meaning depends on the place, period, and counting method.
- United States, 2025: The EIA reported an average of 561 rotary rigs operating across the 50 states and the District of Columbia: 547 onshore and 14 offshore. These are rounded annual averages based on weekly reports over 52- or 53-week reporting periods, not a count on a single day or a worldwide total. See the EIA’s Crude Oil and Natural Gas Drilling Activity series and its methodology notes.
- European waters, 2024: The European Commission reported 324 oil and gas offshore installations, compared with 313 in 2023. For the 2024 reporting period, it also reported 72 incidents, two classified as major, and a 3.6% decrease in overall oil and gas production. These figures describe offshore installations and reported events, not the global rig count. See the Commission’s Safety of offshore oil and gas operations.
What safety and environmental rules apply?
Requirements depend on where a well or installation operates; no single set of rules describes every country. The regulatory examples below apply to specific jurisdictions.
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Under the framework of Directive 2013/30/EU, offshore companies must prepare a Report on Major Hazards before exploration or production begins. It must include a risk assessment and an emergency response plan, and companies must have resources available to carry out that plan. National authorities verify safety provisions, environmental protection, and emergency preparedness. The European Commission outlines these requirements on its offshore safety page.
United States
The EIA says U.S. offshore producers must take precautions to prevent pollution, spills, and significant changes to the ocean environment. Wells that are no longer economic are sealed and abandoned under applicable regulations. Those obligations do not mean that risk is eliminated, and they should not be treated as a description of other countries’ laws. See the EIA’s offshore oil and natural gas overview.
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