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For the following phase, a 12-inch (30-centimeter) drill bit digs the nicely even deeper. The shade goldenrod is a representation of the color of among the deeper gold colored goldenrod flowers. As the boring hole descends deeper into the bottom, operators ship a constant circulate of drilling mud right down to the drill bit, which then flows again up to the platform. One platform can boast as many as eighty wells, although not all of them go straight down. The liquid that rises as much as the platform is a mixture of crude oil, natural fuel, water and sediments. At this point, undersea pipelines and oil tankers transport the separated oil and natural fuel to onshore storage and treatment plants. The other platforms pipe petroleum over for processing and/or storage. At this level, engineers remove the drill string and ship down hollow segments of metal pipe called casing. Since manufacturing wells often must sink miles into the Earth's crust, the drill itself consists principally of a number of 30-foot (9.1-meter) drill pipes screwed together, known as a drill string.

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