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The well is created by drilling a hole 12 cm to 1 meter (5 in to 40 in) in diameter into the earth with a drilling rig that rotates a drill string with a bit attached. At depths during the process, sections of steel pipe , slightly smaller in diameter than the borehole at that point, are placed in the hole. Cement slurry will be pumped down the ...
PT Bumi Resources Tbk is one of the largest mining companies in Indonesia and is structured as a holding company. [3] In the 2012 Forbes Global 2000, Bumi Resources was ranked as the 1898th-largest public company in the world. [4] It is the biggest producer of thermal coal in Indonesia and is majority owned by the Bakrie Group. [5]