They use a steel framework anchored to the ocean floor as a foundation for a surface drilling rig, equipment, and living quarters. Platforms may drill in many directions from this base, and they are broken down into specific types suited for various depths.
Fixed platforms are made of steel or cement and are intended to be permanent structures. They house large facilities, heavy equipment, and big crews.
Most are located on the continental shelf in deep water up to feet. They can drill directionally with a radius of up to five miles. The platform is held in place by large steel or concrete legs that attach to the ocean floor. When the oil or gas is even deeper, from up to feet, a compliant tower may be used. These structures are made of concrete and steel and are tall and narrow.
They are intended to flex and sway with the wind and waves. Up to feet, they attach firmly to the sea bed, but, for greater depths, a tension leg platform may be used.
These towers are technically floating platforms that are secured with a series of anchors and cables. They are fixed but also floating, and they can reach depths of feet. In very deep water, it is not practical to attach an offshore rig to the bottom of the ocean. Floating oil rigs are kept in place by anchors or dynamic positioning systems that keep them over target.
There are several types of floaters in use at various deep water drilling locations worldwide. For deeper waters up to 12, feet, the preferred method of exploration and drilling is to use semisubmersibles or drill ships.
The 1,foot tall Troll A platform off the west coast of Norway includes 1, feet of structure below the water's surface. Along with impressive height, when the platform moved over land into the North Sea in in a seven-day process, it became the largest object to ever be moved by man across the earth.
If you're looking for tall oil rigs, look no further than the Gulf of Mexico where you'll find the Chevron-operated Petronius. The platform's piled tower design gives the whole structure a height of 2, feet, but with only feet visible above water.
The 43,ton structure hovers above the seabed which lays 1, feet below, and the underwater structure can sway in excess of two percent of its height. The world's first iceberg-resistant gravity-based structure, the Hibernia platform includes a 41,ton topside facility mounted on a ,ton gravity base structure, which literally sits on the seabed. The largest offshore platform in Canada, the Hibernia can withstand a six-million-ton iceberg, and has an iceberg management system that works to detect the movements of incoming ice and alter its path away from the structure.
Type keyword s to search. Today's Top Stories. Advertisement - Continue Reading Below. A second well was drilled to a total depth of 17, feet 5, meters. Although these wells are not counted as part of the Magnolia Platform's height, it creates a total project relief of over 22, feet 6, meters from the top of the platform, down to the seabed and then down to the bottom of the production wells.
The primary function of Magnolia TLP is to manage oil production from five wells drilled into the floor of the Gulf. It has a design capacity of 50, barrels of oil per day and million cubic feet of natural gas 4. It currently produces about 5, barrels of oil per day. This oil is transported by underwater pipelines to the Shell Enchilada platform which serves as an oil and gas processing and transportation hub.
The Magnolia TLP operates twenty-four hours per day, seven days a week, and days per year. The platform has living quarters, dining facilities and break areas for crew members.
They work extended shifts on the platform and are flown to shore by helicopter for off time. One of the most important differences between the Magnolia Platform and a skyscraper is how they are supported. A skyscraper is "held up" by a framework of rigid steel beams and concrete. The Magnolia platform is a floating structure.
Instead of being "held up" it is "held down" by steel tethers connected to the seafloor. This design is known as a "tension leg platform. This design is quite the opposite of how most people think of a "tall structure.
The "hull" of the Magnolia TLP consists of four cylindrical columns the yellow cylinders in the photo at the top of this page. These columns are connected below the waterline by a rectangular pontoon frame.
At the base of each column, two steel tethers descend to a pile foundation on the seafloor.
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