Drilling

Offshore drilling refers to a mechanical process where a wellbore is drilled through the seabed. It is typically carried out in order to explore for and subsequently produce hydrocarbons which lie in rock formations beneath the seabed. Most commonly, the term is used to describe drilling activities on the continental shelf, though the term can also be applied to drilling in lakes, inshore waters and inland seas. Offshore drilling presents environmental challenges, both from the produced hydrocarbons and the materials used during the drilling operation.

There are many different types of facilities from which offshore drilling operations take place. These include bottom founded drilling rigs (jackup barges and swamp barges), combined drilling and production facilities either bottom founded or floating platforms, and deepwater mobile offshore drilling units (MODU) including semi-submersibles and drillships. These are capable of operating in water depths up to 10,000 ft. In shallower waters the mobile units are anchored to the seabed, however in deeper water (>5,000 ft) the semisubmersibles or drillships are maintained at the required drilling location using dynamic positioning.

Offshore operations are fundamentally the same as onshore operations with the major difference being in the complexity of the production sites and hence their costs. Offshore production facilities are self-contained production sites. The platforms are semi-permanent structures from which many wells are drilled and completed.

It is necessary to drill a hole to obtain crude oil and natural gas from under the earth's surface. Engineers make this hole using a rotary drilling rig.

Yemen Contact

Hadda Street, Sana'a, Yemen

P.O. Box 7067

Office: 00-967-1-427487
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Ottawa, Ontario, Canada


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Extra Petroleum

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K1T 1W4

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