On/ Off Shore

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In short, onshore drilling denotes drilling deep holes under the earth's surface whereas offshore drilling refers to drilling underneath the seabed. These drilling approaches are used in order to extract natural resources – usually oil and gas – from the earth.

Extracting oil from underneath the surface of the seabed used to be much more difficult than the traditional onshore drilling technique of making wells on land and drilling holes. Offshore drilling has become easier through the advanced methods that have surfaced such as making either floating or fixed platforms on the seabed of the ocean to support drilling.

Overall, the equipment used in both offshore and onshore drilling are not much different. Both approaches require tools like exploratory equipment, waste-water/oil separators, pumps, pipelines and storage tanks.

However, there are some important differences between offshore and onshore drilling equipment as well, precisely in the structure of the drilling rig itself.

Onshore drilling rigs are the more typical drilling equipment and come in different proportions and strengths. Generally categorised by their maximum drilling depth and their mobility. The Conventional type land rigs cannot be moved as a whole unit and are normally used in the petroleum industry while mobile rigs are drilling systems that are attached on wheeled trucks.

Offshore drilling rigs are categorised differently, mainly based on their transportability and how deep the sea bed is. There are two types of offshore drilling rigs.

1. Bottom-supported units are rigs that have connection with the seafloor. There are submersible bottom-supported units and also jack up units that are reinforced and supported by structured columns.

2. Floating units do not come in direct contact with the seabed i.e. ocean floor and instead float on the water. Some are partly submerged and anchored to the sea bed while others are drilling ships which can drill at diverse water depths.


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