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That poses a significant problem, just how do you get all that carbon-based fuel out? The first offshore oil platform was constructed in off of the coast of California. Oil companies invested heavily in the technology over the next several decades. By , a Texan company placed a mobile offshore oil platform in the wetlands bordering Texas and Louisiana. The structure was essentially just a barge with an oil drill mounted to the top, but it signaled just what might be possible in the industry with more and more innovation.
By , a group of oil companies built the first platform not visible from land in the Gulf of Mexico. These first offshore rigs are dwarfed by the offshore rigs of today. Some rigs now have underwater towers that extend to lengths of 4, feet or meters into the ocean. For reference, the Burj Khalifa, the world's tallest building, is just 2, feet tall. Any person with the knowledge of how oil is formed, through the compression of carbon-based life-forms over time, might be wondering how the vast amount of the world's oil got trapped under the oceans.
The answer is fairly simple. Roughly 10 to million years ago, all this oil started as plankton and over time, the plankton was compacted through the buildup of sand and mud. In order to find where all of this oil is located under the seafloor, companies have to use "sniffer equipment.
When they signal they have found something, researchers then have to do a magnetic survey on the seafloor to determine where there might be anomalies underground. These survey research teams can also use seismic surveying, which sends shock waves through the seafloor and listens for how those waves are returned through hydrophones. Once a reserve of oil has been determined, the information is passed off to the respective oil company, and offshore drilling can begin. The first step after an underwater oil reserve has been found is the installation of exploratory wells.
Each of these wells takes 2 to 3 months to install, and they're used to take samples of the rock layers underneath the seafloor. This is the same geological process used for building large buildings on land, except that the process has to be done thousands of feet underwater. Once the core samples taken from the exploratory wells yield more accurate survey results, companies will map out the subsurface structure and determine the exact place to drill the production well.
Production wells are the main source of any given offshore oil platform, and they're what these platforms are put in place to run. Once the exact location of the production well is determined, engineers start developing plans of how to place the offshore oil well atop it. One thing you might not be aware of is that these oil wells and platforms don't just drill straight down.
Thanks to directional drilling technology, oil platforms have the capability of tapping into tens of different reserves in the same general location. Directional drills have the ability to turn and weave through the underground surface, essentially allowing them to bore to the exact location where oil is located.
The entire process of installing an offshore oil rig takes roughly 2 to 3 years. That said, the aforementioned underground mapping gives enough information that these companies can be fairly certain their investment will pay off over time. If you're looking to watch an entire documentary on the process, the following video gives an in-depth look. Offshore oil wells dive deep into the earth's crust, several miles in most cases. Oil platforms will have drilling equipment that allows them to keep drilling wells deeper and deeper or further and further out.
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